GNU bug report logs - #59994
[PATCH] tests: Don't try to prevent flex to include unistd.h

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Frederic Berat <fberat <at> redhat.com>
To: automake-patches <at> gnu.org
Cc: Frédéric Bérat <fberat <at> redhat.com>
Subject: [PATCH] tests: Don't try to prevent flex to include unistd.h
Date: Mon, 12 Dec 2022 08:07:52 +0100

From: Frédéric Bérat <fberat <at> redhat.com>

Hello,

This patch is mainly a proposal. While the macro can simply be removed
as explained below, another possibility it to add a flex option
"--never-interactive" to prevent flex to make use of "isatty".

-- 8< --

This is related to an effort to prepare Automake for future GCC/Clang
versions which set c99 as default standard to be used.

Future version of flex make the "NO_UNISTD" flag a no-op, and include
unistd.h by default.

In current version of flex, not having this header leads to implicit
function declarations that are not compatible with c99 standard.

On top of that, while flex dedicated test were having this macro set,
the yacc ones didn't have it despise their use of Flex. Thus, if this
macro was ever useful, it looks like nobody actually cared.

---
 t/cond35.sh       | 3 ---
 t/lex-clean.sh    | 3 ---
 t/lex-depend.sh   | 3 ---
 t/lex-header.sh   | 3 ---
 t/lex-lib.sh      | 3 ---
 t/lex-libobj.sh   | 3 ---
 t/lex-line.sh     | 3 ---
 t/lex-multiple.sh | 3 ---
 t/lex-nodist.sh   | 3 ---
 t/lex-noyywrap.sh | 3 ---
 t/lex3.sh         | 3 ---
 t/lex5.sh         | 3 ---
 t/lexvpath.sh     | 9 ---------
 t/silent-lex.sh   | 3 ---
 14 files changed, 48 deletions(-)

diff --git a/t/cond35.sh b/t/cond35.sh
index bad133970..435e02ffc 100644
--- a/t/cond35.sh
+++ b/t/cond35.sh
@@ -58,9 +58,6 @@ $FGREP 'tparse.h' Makefile.in # For debugging.
 test $($FGREP -c 'tparse.h:' Makefile.in) -eq 1
 
 cat > tscan.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"   return EOF;
 %%
diff --git a/t/lex-clean.sh b/t/lex-clean.sh
index e53da8fd2..6ab451173 100644
--- a/t/lex-clean.sh
+++ b/t/lex-clean.sh
@@ -52,9 +52,6 @@ LDADD = $(LEXLIB)
 END
 
 cat > lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex-depend.sh b/t/lex-depend.sh
index c6fde8c1f..7fbf60370 100644
--- a/t/lex-depend.sh
+++ b/t/lex-depend.sh
@@ -42,9 +42,6 @@ test-obj-updated: joe.$(OBJEXT)
 END
 
 cat > joe.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "foo" return EOF;
 .
diff --git a/t/lex-header.sh b/t/lex-header.sh
index 73beb95b6..46e8be60c 100644
--- a/t/lex-header.sh
+++ b/t/lex-header.sh
@@ -45,9 +45,6 @@ END
 
 cat > lexer.l << 'END'
 %option noyywrap
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex-lib.sh b/t/lex-lib.sh
index a251534d5..4ec75abe4 100644
--- a/t/lex-lib.sh
+++ b/t/lex-lib.sh
@@ -47,9 +47,6 @@ int yywrap (void)
 END
 
 cat > foo.l <<'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
diff --git a/t/lex-libobj.sh b/t/lex-libobj.sh
index 5d4c13ebd..50ac10bb0 100644
--- a/t/lex-libobj.sh
+++ b/t/lex-libobj.sh
@@ -45,9 +45,6 @@ int yywrap (void)
 END
 
 cat > foo.l <<'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
diff --git a/t/lex-line.sh b/t/lex-line.sh
index ef2a2a808..6107d0664 100644
--- a/t/lex-line.sh
+++ b/t/lex-line.sh
@@ -57,9 +57,6 @@ dir/quux.@OBJEXT@: dir/quux.c
 END
 
 cat > zardoz.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"  return EOF;
 .
diff --git a/t/lex-multiple.sh b/t/lex-multiple.sh
index bf119ec84..5f4695deb 100644
--- a/t/lex-multiple.sh
+++ b/t/lex-multiple.sh
@@ -76,9 +76,6 @@ int main (int argc, char *argv[])
 END
 
 cat > 0.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "VANILLA" { printf (":%s:\n", yytext); return 121; }
 . { printf (":%s:\n", yytext); return 1; }
diff --git a/t/lex-nodist.sh b/t/lex-nodist.sh
index 187dd5437..4a4d0f01c 100644
--- a/t/lex-nodist.sh
+++ b/t/lex-nodist.sh
@@ -45,9 +45,6 @@ check-local: test-build test-dist
 lexer.l:
 	rm -f $@ $@-t
 	:; { : \
-	  && echo '%{' \
-	  && echo '#define YY_NO_UNISTD_H 1' \
-	  && echo '%}' \
 	  && echo '%%' \
 	  && echo '"GOOD" return EOF;' \
 	  && echo '.'; \
diff --git a/t/lex-noyywrap.sh b/t/lex-noyywrap.sh
index c11813429..0451dbcf5 100644
--- a/t/lex-noyywrap.sh
+++ b/t/lex-noyywrap.sh
@@ -37,9 +37,6 @@ END
 
 cat > foo.l << 'END'
 %option noyywrap
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex3.sh b/t/lex3.sh
index 7de5fe2a6..9e54e7abf 100644
--- a/t/lex3.sh
+++ b/t/lex3.sh
@@ -33,9 +33,6 @@ foo_SOURCES = foo.l
 END
 
 cat > foo.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex5.sh b/t/lex5.sh
index 0563a35ee..da354e2ac 100644
--- a/t/lex5.sh
+++ b/t/lex5.sh
@@ -36,9 +36,6 @@ END
 mkdir foo
 
 cat > foo/foo.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"   return EOF;
 .
diff --git a/t/lexvpath.sh b/t/lexvpath.sh
index 84187a916..33fab0a80 100644
--- a/t/lexvpath.sh
+++ b/t/lexvpath.sh
@@ -44,9 +44,6 @@ END
 
 # Original lexer, with a "foobar" comment
 cat > lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
@@ -89,9 +86,6 @@ $sleep
 
 # New lexer, with 'fubar' comment.
 cat > ../lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
@@ -112,9 +106,6 @@ $sleep
 
 # New lexer, with 'maude' comment.
 cat > ../lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
diff --git a/t/silent-lex.sh b/t/silent-lex.sh
index f319eee93..c15a30a9d 100644
--- a/t/silent-lex.sh
+++ b/t/silent-lex.sh
@@ -50,9 +50,6 @@ LDADD = $(LEXLIB)
 EOF
 
 cat > foo.l <<'EOF'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"   return EOF;
 .
-- 
2.38.1

Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Zack Weinberg <zack <at> owlfolio.org>
To: automake-patches <at> gnu.org
Subject: Re: [bug#59994] [PATCH] tests: Don't try to prevent flex to include
 unistd.h
Date: Mon, 12 Dec 2022 15:20:46 -0500

On 2022-12-12 2:07 AM, Frederic Berat wrote:
> 
> This patch is mainly a proposal. While the macro can simply be removed
> as explained below, another possibility it to add a flex option
> "--never-interactive" to prevent flex to make use of "isatty".
>
> This is related to an effort to prepare Automake for future GCC/Clang
> versions which set c99 as default standard to be used.
> 
> Future version of flex make the "NO_UNISTD" flag a no-op, and include
> unistd.h by default.
> 
> In current version of flex, not having this header leads to implicit
> function declarations that are not compatible with c99 standard.
> 
> On top of that, while flex dedicated test were having this macro set,
> the yacc ones didn't have it despise their use of Flex. Thus, if this
> macro was ever useful, it looks like nobody actually cared.

I'm guessing that the idea here was to avoid using unistd.h on platforms 
that don't supply that header at all.  I suggest that we should apply 
your patch *and* consistently test flex with "--never-interactive".

zw

Message #11 received at 59994 <at> debbugs.gnu.org (full text, mbox):

From: Mike Frysinger <vapier <at> gentoo.org>
To: fberat <at> redhat.com
Cc: 59994 <at> debbugs.gnu.org, Zack Weinberg <zack <at> owlfolio.org>
Subject: Re: [bug#59994] [PATCH] tests: Don't try to prevent flex to include
 unistd.h
Date: Fri, 13 Jan 2023 06:30:13 +0000 (UTC)

On Mon, 12 Dec 2022 15:20:46 -0500, Zack Weinberg wrote:
> On 2022-12-12 2:07 AM, Frederic Berat wrote:
> > 
> > This patch is mainly a proposal. While the macro can simply be removed
> > as explained below, another possibility it to add a flex option
> > "--never-interactive" to prevent flex to make use of "isatty".
> >
> > This is related to an effort to prepare Automake for future GCC/Clang
> > versions which set c99 as default standard to be used.
> > 
> > Future version of flex make the "NO_UNISTD" flag a no-op, and include
> > unistd.h by default.
> > 
> > In current version of flex, not having this header leads to implicit
> > function declarations that are not compatible with c99 standard.
> > 
> > On top of that, while flex dedicated test were having this macro set,
> > the yacc ones didn't have it despise their use of Flex. Thus, if this
> > macro was ever useful, it looks like nobody actually cared.
>
> I'm guessing that the idea here was to avoid using unistd.h on platforms 
> that don't supply that header at all.  I suggest that we should apply 
> your patch *and* consistently test flex with "--never-interactive".

sounds fine.  want to update your patch Frederic ?
-mike

Message #14 received at 59994 <at> debbugs.gnu.org (full text, mbox):

From: Frederic Berat <fberat <at> redhat.com>
To: Mike Frysinger <vapier <at> gentoo.org>
Cc: Zack Weinberg <zack <at> owlfolio.org>, 59994 <at> debbugs.gnu.org
Subject: Re: [bug#59994] [PATCH] tests: Don't try to prevent flex to include
 unistd.h
Date: Fri, 13 Jan 2023 13:49:27 +0100

[Message part 1 (text/plain, inline)]

I probably won't be able to do so before next week at least.
If you happen to have time (and be willing) to do it earlier, don't
hesitate ;)

On Fri, Jan 13, 2023 at 7:31 AM Mike Frysinger <vapier <at> gentoo.org> wrote:

> On Mon, 12 Dec 2022 15:20:46 -0500, Zack Weinberg wrote:
> > On 2022-12-12 2:07 AM, Frederic Berat wrote:
> > >
> > > This patch is mainly a proposal. While the macro can simply be removed
> > > as explained below, another possibility it to add a flex option
> > > "--never-interactive" to prevent flex to make use of "isatty".
> > >
> > > This is related to an effort to prepare Automake for future GCC/Clang
> > > versions which set c99 as default standard to be used.
> > >
> > > Future version of flex make the "NO_UNISTD" flag a no-op, and include
> > > unistd.h by default.
> > >
> > > In current version of flex, not having this header leads to implicit
> > > function declarations that are not compatible with c99 standard.
> > >
> > > On top of that, while flex dedicated test were having this macro set,
> > > the yacc ones didn't have it despise their use of Flex. Thus, if this
> > > macro was ever useful, it looks like nobody actually cared.
> >
> > I'm guessing that the idea here was to avoid using unistd.h on platforms
> > that don't supply that header at all.  I suggest that we should apply
> > your patch *and* consistently test flex with "--never-interactive".
>
> sounds fine.  want to update your patch Frederic ?
> -mike
>
>
>
>

[Message part 2 (text/html, inline)]

Message #17 received at 59994 <at> debbugs.gnu.org (full text, mbox):

From: Mike Frysinger <vapier <at> gentoo.org>
To: Frederic Berat <fberat <at> redhat.com>
Cc: Zack Weinberg <zack <at> owlfolio.org>, 59994 <at> debbugs.gnu.org
Subject: Re: [bug#59994] [PATCH] tests: Don't try to prevent flex to include
 unistd.h
Date: Fri, 13 Jan 2023 09:25:18 -0500

[Message part 1 (text/plain, inline)]

On 13 Jan 2023 13:49, Frederic Berat wrote:
> I probably won't be able to do so before next week at least.
> If you happen to have time (and be willing) to do it earlier, don't
> hesitate ;)

that timeframe is fine.  as you can see, we take a long view in Automake.
-mike

[signature.asc (application/pgp-signature, inline)]

Message #20 received at 59994 <at> debbugs.gnu.org (full text, mbox):

From: Karl Berry <karl <at> freefriends.org>
To: vapier <at> gentoo.org
Cc: zack <at> owlfolio.org, fberat <at> redhat.com, 59994 <at> debbugs.gnu.org
Subject: Re: [bug#59994] [PATCH] tests: Don't try to prevent flex to include
 unistd.h
Date: Fri, 13 Jan 2023 16:33:48 -0700

    > your patch *and* consistently test flex with "--never-interactive".

Making flex non-interactive sounds desirable in any case, but
--never-interactive is not mentioned in the 2.6.0 --help message.

Instead there is -B (--batch), although --never-interactive is
recognized, I can see experimentally.

I do not know when --never-interactive, or any of its variants, was
implemented. We should check that before using it ... --thanks, karl.

Message #23 received at submit <at> debbugs.gnu.org (full text, mbox):

From: "Zack Weinberg" <zack <at> owlfolio.org>
To: automake-patches <at> gnu.org
Subject: Re: [bug#59994] [PATCH] tests: Don't try to prevent flex to include
 unistd.h
Date: Sat, 14 Jan 2023 11:15:46 -0500

On Fri, Jan 13, 2023, at 6:33 PM, Karl Berry wrote:
>> your patch *and* consistently test flex with "--never-interactive".
>
> Making flex non-interactive sounds desirable in any case, but
> --never-interactive is not mentioned in the 2.6.0 --help message.
> Instead there is -B (--batch), although --never-interactive is
> recognized, I can see experimentally.

--never-interactive is documented in the Texinfo manual ("Options
Affecting Scanner Behavior" node).  It looks to me like the --help
output intentionally lists only the most commonly used options.

--never-interactive and --batch are technically orthogonal.  I don't
know any reason a *real* scanner would want to use --never-interactive
*without* --batch.  However, to address the specific problem with *test*
scanners we are discussing here, --never-interactive is what we want,
because --never-interactive is the option that makes the generated code
not call isatty().

> I do not know when --never-interactive, or any of its variants, was
> implemented. We should check that before using it ...

I'm pleasantly surprised to report that the Git repo for flex at
<https://github.com/westes/flex> has history going back all the way
to 1987.

The *feature* of optionally not calling isatty() on the input file
has been present since version 2.5.1 (released 1995-03-28), in the
form of `%option {always,never}-interactive` directives inside the
scanner.  The *command line option* --never-interactive was added
in version 2.5.6 (along with long command line options in general).
That version was released somewhere between 2002-04-19 and 2002-04-23;
the exact date is not recorded anywhere I can find.

zw

Message #26 received at 59994 <at> debbugs.gnu.org (full text, mbox):

From: Karl Berry <karl <at> freefriends.org>
To: zack <at> owlfolio.org
Cc: 59994 <at> debbugs.gnu.org
Subject: Re: [bug#59994] [PATCH] tests: Don't try to prevent flex to include
 unistd.h
Date: Sat, 14 Jan 2023 14:34:28 -0700

    The *command line option* --never-interactive was added
    in version 2.5.6 (along with long command line options in general).
    That version was released somewhere between 2002-04-19 and 2002-04-23;

I guess 20 years ago is long enough, barely :). Though if it's just as
easy to use the %option, why not ... since we already have to assume
flex (specifically) either way ... --thanks, karl.

Message #29 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Frédéric Bérat <fberat <at> redhat.com>
To: automake-patches <at> gnu.org
Subject: [PATCH v2] tests: Don't try to prevent flex to include unistd.h
Date: Fri, 20 Jan 2023 11:35:44 +0100

Hello,

Changes since v1:
 - The "--never-interactive" option is added to AM_LFLAGS whenever a
   yacc or lex test needs to execute make.

Since there is quite a lot of files being modified, please review carefully.
Hopefully, I didn't forget anything, nor edited files that were not needed,
multiple sets of eyes may be useful here.

-- 8< --

This patch is related to an effort to prepare Automake for future
GCC/Clang versions which set c99 as default standard to be used.

Future version of flex make the "NO_UNISTD" flag a no-op, and include
unistd.h by default.

In current version of flex, not having this header leads to implicit
function declarations that are not compatible with c99 standard.

On top of that, while flex dedicated test were having this macro set,
the yacc ones didn't have it despise their use of Flex.

For consistency, all the YACC/Flex related tests now have the
"--never-interactive" option set in AM_LFLAGS.

Modified files:
 *  t/cond35.sh
 *  t/lex-clean-cxx.sh
 *  t/lex-clean.sh
 *  t/lex-depend-cxx.sh
 *  t/lex-depend.sh
 *  t/lex-header.sh
 *  t/lex-lib-external.sh
 *  t/lex-lib.sh
 *  t/lex-libobj.sh
 *  t/lex-line.sh
 *  t/lex-multiple.sh
 *  t/lex-nodist.sh
 *  t/lex-noyywrap.sh
 *  t/lex-pr204.sh
 *  t/lex-subobj-nodep.sh
 *  t/lex3.sh
 *  t/lex5.sh
 *  t/lexvpath.sh
 *  t/silent-lex.sh
 *  t/silent-many-languages.sh
 *  t/silent-yacc-headers.sh
 *  t/silent-yacc.sh
 *  t/subpkg-yacc.sh
 *  t/suffix10.tap
 *  t/yacc-auxdir.sh
 *  t/yacc-basic.sh
 *  t/yacc-bison-skeleton-cxx.sh
 *  t/yacc-bison-skeleton.sh
 *  t/yacc-clean-cxx.sh
 *  t/yacc-clean.sh
 *  t/yacc-cxx-grepping.sh
 *  t/yacc-cxx.sh
 *  t/yacc-d-basic.sh
 *  t/yacc-d-cxx.sh
 *  t/yacc-d-vpath.sh
 *  t/yacc-deleted-headers.sh
 *  t/yacc-depend.sh
 *  t/yacc-depend2.sh
 *  t/yacc-dist-nobuild-subdir.sh
 *  t/yacc-dist-nobuild.sh
 *  t/yacc-dry.sh
 *  t/yacc-grepping.sh
 *  t/yacc-grepping2.sh
 *  t/yacc-headers-and-dist-pr47.sh
 *  t/yacc-line.sh
 *  t/yacc-misc.sh
 *  t/yacc-mix-c-cxx.sh
 *  t/yacc-nodist.sh
 *  t/yacc-pr204.sh
 *  t/yacc-subdir.sh
 *  t/yacc-vpath.sh
 *  t/yacc-weirdnames.sh
 *  t/yflags-cmdline-override.sh
 *  t/yflags-cxx.sh
 *  t/yflags-d-false-positives.sh
 *  t/yflags-force-conditional.sh
 *  t/yflags-force-override.sh
 *  t/yflags-var-expand.sh
 *  t/yflags.sh
---
 t/cond35.sh                     |  4 +---
 t/lex-clean-cxx.sh              |  4 ++--
 t/lex-clean.sh                  |  5 ++---
 t/lex-depend-cxx.sh             |  4 ++--
 t/lex-depend.sh                 |  5 ++---
 t/lex-header.sh                 |  6 ++----
 t/lex-lib-external.sh           |  5 ++---
 t/lex-lib.sh                    |  5 ++---
 t/lex-libobj.sh                 |  5 ++---
 t/lex-line.sh                   |  7 ++++---
 t/lex-multiple.sh               |  7 +++----
 t/lex-nodist.sh                 |  5 ++---
 t/lex-noyywrap.sh               |  5 ++---
 t/lex-pr204.sh                  |  5 ++---
 t/lex-subobj-nodep.sh           |  5 ++---
 t/lex3.sh                       |  5 ++---
 t/lex5.sh                       |  4 +---
 t/lexvpath.sh                   | 11 ++---------
 t/silent-lex.sh                 |  7 ++++---
 t/silent-many-languages.sh      |  1 +
 t/silent-yacc-headers.sh        |  1 +
 t/silent-yacc.sh                |  4 ++++
 t/subpkg-yacc.sh                |  2 ++
 t/suffix10.tap                  |  2 ++
 t/yacc-auxdir.sh                |  4 ++++
 t/yacc-basic.sh                 |  2 ++
 t/yacc-bison-skeleton-cxx.sh    |  2 ++
 t/yacc-bison-skeleton.sh        |  2 ++
 t/yacc-clean-cxx.sh             |  2 ++
 t/yacc-clean.sh                 |  2 ++
 t/yacc-cxx-grepping.sh          |  2 ++
 t/yacc-cxx.sh                   |  2 ++
 t/yacc-d-basic.sh               |  2 ++
 t/yacc-d-cxx.sh                 |  2 ++
 t/yacc-d-vpath.sh               |  2 ++
 t/yacc-deleted-headers.sh       |  2 ++
 t/yacc-depend.sh                |  2 ++
 t/yacc-depend2.sh               |  2 ++
 t/yacc-dist-nobuild-subdir.sh   |  2 ++
 t/yacc-dist-nobuild.sh          |  2 ++
 t/yacc-dry.sh                   |  2 ++
 t/yacc-grepping.sh              |  2 ++
 t/yacc-grepping2.sh             |  2 ++
 t/yacc-headers-and-dist-pr47.sh |  2 ++
 t/yacc-line.sh                  |  4 ++++
 t/yacc-misc.sh                  |  2 ++
 t/yacc-mix-c-cxx.sh             |  2 ++
 t/yacc-nodist.sh                |  2 ++
 t/yacc-pr204.sh                 |  2 ++
 t/yacc-subdir.sh                |  2 ++
 t/yacc-vpath.sh                 |  2 ++
 t/yacc-weirdnames.sh            |  2 ++
 t/yflags-cmdline-override.sh    |  2 ++
 t/yflags-cxx.sh                 |  2 ++
 t/yflags-d-false-positives.sh   |  2 ++
 t/yflags-force-conditional.sh   |  2 ++
 t/yflags-force-override.sh      |  2 ++
 t/yflags-var-expand.sh          |  2 ++
 t/yflags.sh                     |  2 ++
 59 files changed, 125 insertions(+), 63 deletions(-)

diff --git a/t/cond35.sh b/t/cond35.sh
index dc3b8aae9..8b044644e 100644
--- a/t/cond35.sh
+++ b/t/cond35.sh
@@ -30,6 +30,7 @@ EOF
 
 cat > Makefile.am <<'EOF'
 AM_YFLAGS               =       -d
+AM_LFLAGS               =       --never-interactive
 
 BUILT_SOURCES           =       tparse.h
 
@@ -58,9 +59,6 @@ $FGREP 'tparse.h' Makefile.in # For debugging.
 test $($FGREP -c 'tparse.h:' Makefile.in) -eq 1
 
 cat > tscan.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"   return EOF;
 %%
diff --git a/t/lex-clean-cxx.sh b/t/lex-clean-cxx.sh
index 3632d5c87..9f628accd 100644
--- a/t/lex-clean-cxx.sh
+++ b/t/lex-clean-cxx.sh
@@ -29,6 +29,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar baz qux
 
 foo_SOURCES = mainfoo.cc parsefoo.lxx
@@ -55,8 +57,6 @@ cat > parsefoo.lxx << 'END'
 %{
 #define YY_DECL int yylex (void)
 extern "C" YY_DECL;
-#define YY_NO_UNISTD_H 1
-int isatty (int fd) { return 0; }
 %}
 %%
 "GOOD"   return EOF;
diff --git a/t/lex-clean.sh b/t/lex-clean.sh
index 1ee7d8f5b..4668e97c7 100644
--- a/t/lex-clean.sh
+++ b/t/lex-clean.sh
@@ -29,6 +29,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar baz qux
 
 foo_SOURCES = main.c lexer.l
@@ -52,9 +54,6 @@ LDADD = $(LEXLIB)
 END
 
 cat > lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex-depend-cxx.sh b/t/lex-depend-cxx.sh
index 60615a54e..51bd67b7b 100644
--- a/t/lex-depend-cxx.sh
+++ b/t/lex-depend-cxx.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 noinst_PROGRAMS = joe moe
 joe_SOURCES = joe.ll
 moe_SOURCES = moe.l++
@@ -48,8 +50,6 @@ cat > joe.ll << 'END'
 %{
 #define YY_DECL int yylex (void)
 extern "C" YY_DECL;
-#define YY_NO_UNISTD_H 1
-int isatty (int fd) { return 0; }
 %}
 %%
 "foo" return EOF;
diff --git a/t/lex-depend.sh b/t/lex-depend.sh
index 16f937ef1..68cc5ee7b 100644
--- a/t/lex-depend.sh
+++ b/t/lex-depend.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zoo
 zoo_SOURCES = joe.l
 LDADD = $(LEXLIB)
@@ -42,9 +44,6 @@ test-obj-updated: joe.$(OBJEXT)
 END
 
 cat > joe.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "foo" return EOF;
 .
diff --git a/t/lex-header.sh b/t/lex-header.sh
index 22567642e..48b42457a 100644
--- a/t/lex-header.sh
+++ b/t/lex-header.sh
@@ -33,6 +33,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = lexer.l main.c mylex.h
 foo_LFLAGS = --header-file=mylex.h
@@ -45,9 +47,6 @@ END
 
 cat > lexer.l << 'END'
 %option noyywrap
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
@@ -55,7 +54,6 @@ cat > lexer.l << 'END'
 END
 
 cat > main.c <<'END'
-#define YY_NO_UNISTD_H 1
 #include "mylex.h"
 int main (void)
 {
diff --git a/t/lex-lib-external.sh b/t/lex-lib-external.sh
index 85403612f..25ad2a39b 100644
--- a/t/lex-lib-external.sh
+++ b/t/lex-lib-external.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = lexer
 lexer_SOURCES = foo.l
 lexer_LDADD = $(LEXLIB)
@@ -42,9 +44,6 @@ have-lexlib:
 END
 
 cat > foo.l <<'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex-lib.sh b/t/lex-lib.sh
index f0a0d37f6..7734fd228 100644
--- a/t/lex-lib.sh
+++ b/t/lex-lib.sh
@@ -31,6 +31,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = lexer
 lexer_SOURCES = foo.l
 lexer_LDADD = $(LEXLIB)
@@ -47,9 +49,6 @@ int yywrap (void)
 END
 
 cat > foo.l <<'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
diff --git a/t/lex-libobj.sh b/t/lex-libobj.sh
index b26381fcf..6e36a98ed 100644
--- a/t/lex-libobj.sh
+++ b/t/lex-libobj.sh
@@ -32,6 +32,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 noinst_PROGRAMS = foo
 foo_SOURCES = foo.l
 foo_LDADD = $(LEXLIB) $(LIBOBJS)
@@ -45,9 +47,6 @@ int yywrap (void)
 END
 
 cat > foo.l <<'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
diff --git a/t/lex-line.sh b/t/lex-line.sh
index 340800ef2..5f9145847 100644
--- a/t/lex-line.sh
+++ b/t/lex-line.sh
@@ -32,6 +32,8 @@ END
 mkdir dir sub sub/dir
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 SUBDIRS = sub
 bin_PROGRAMS = foo bar
 LDADD = $(LEXLIB)
@@ -44,6 +46,8 @@ bar-quux.@OBJEXT@: bar-quux.c
 END
 
 cat > sub/Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 AUTOMAKE_OPTIONS = subdir-objects
 noinst_PROGRAMS = foo bar
 ## We already used $(LEXLIB) above, so try @LEXLIB@ now.
@@ -57,9 +61,6 @@ dir/quux.@OBJEXT@: dir/quux.c
 END
 
 cat > zardoz.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"  return EOF;
 .
diff --git a/t/lex-multiple.sh b/t/lex-multiple.sh
index 9565bd6b8..6486a012f 100644
--- a/t/lex-multiple.sh
+++ b/t/lex-multiple.sh
@@ -31,7 +31,9 @@ AC_PROG_RANLIB
 AC_OUTPUT
 END
 
-cat > Makefile.am << 'END'
+cat > Makefile.am <<  'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zardoz
 
 zardoz_SOURCES = main.c
@@ -72,9 +74,6 @@ int main (int argc, char *argv[])
 END
 
 cat > 0.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "VANILLA" { printf (":%s:\n", yytext); return 121; }
 . { printf (":%s:\n", yytext); return 1; }
diff --git a/t/lex-nodist.sh b/t/lex-nodist.sh
index 73e23a13e..d499aea7f 100644
--- a/t/lex-nodist.sh
+++ b/t/lex-nodist.sh
@@ -31,6 +31,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 .PHONY: test-build test-dist
 test-build: all
 	ls -l
@@ -45,9 +47,6 @@ check-local: test-build test-dist
 lexer.l:
 	rm -f $@ $@-t
 	:; { : \
-	  && echo '%{' \
-	  && echo '#define YY_NO_UNISTD_H 1' \
-	  && echo '%}' \
 	  && echo '%%' \
 	  && echo '"GOOD" return EOF;' \
 	  && echo '.'; \
diff --git a/t/lex-noyywrap.sh b/t/lex-noyywrap.sh
index 1c61a1ab3..5ec68b9ba 100644
--- a/t/lex-noyywrap.sh
+++ b/t/lex-noyywrap.sh
@@ -26,6 +26,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = foo.l
 
@@ -37,9 +39,6 @@ END
 
 cat > foo.l << 'END'
 %option noyywrap
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex-pr204.sh b/t/lex-pr204.sh
index ebfaafef5..cbad1c266 100644
--- a/t/lex-pr204.sh
+++ b/t/lex-pr204.sh
@@ -35,6 +35,8 @@ EOF
 # The LEXER2 intermediate variable is there to make sure Automake
 # matches 'nodist_' against the right variable name...
 cat > Makefile.am << 'EOF'
+AM_LFLAGS = --never-interactive
+
 EXTRA_PROGRAMS = foo
 LEXER2 = lexer2.l
 nodist_foo_SOURCES = lexer.l $(LEXER2)
@@ -49,9 +51,6 @@ distdirtest: distdir
 EOF
 
 cat > lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex-subobj-nodep.sh b/t/lex-subobj-nodep.sh
index f8bb87a9c..8ef4d68b1 100644
--- a/t/lex-subobj-nodep.sh
+++ b/t/lex-subobj-nodep.sh
@@ -28,6 +28,8 @@ END
 
 cat >Makefile.am <<\END
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = p1 p2
 p1_SOURCES = sub1/s1.l
 p2_SOURCES = sub2/s2.l
@@ -37,9 +39,6 @@ END
 mkdir sub1 sub2
 
 cat >sub1/s1.l <<\END
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"   return EOF;
 .
diff --git a/t/lex3.sh b/t/lex3.sh
index 41b87dc06..4a20f85da 100644
--- a/t/lex3.sh
+++ b/t/lex3.sh
@@ -28,14 +28,13 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 noinst_PROGRAMS = foo
 foo_SOURCES = foo.l
 END
 
 cat > foo.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex5.sh b/t/lex5.sh
index 3d84d9b41..687903e65 100644
--- a/t/lex5.sh
+++ b/t/lex5.sh
@@ -28,6 +28,7 @@ END
 cat > Makefile.am << 'END'
 AUTOMAKE_OPTIONS  = subdir-objects
 LDADD             = @LEXLIB@
+AM_LFLAGS         = --never-interactive
 
 bin_PROGRAMS    = foo/foo
 foo_foo_SOURCES = foo/foo.l
@@ -36,9 +37,6 @@ END
 mkdir foo
 
 cat > foo/foo.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"   return EOF;
 .
diff --git a/t/lexvpath.sh b/t/lexvpath.sh
index 5185a1f71..d064fd2bd 100644
--- a/t/lexvpath.sh
+++ b/t/lexvpath.sh
@@ -37,6 +37,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = lexer.l foo.c
 LDADD = $(LEXLIB)
@@ -44,9 +46,6 @@ END
 
 # Original lexer, with a "foobar" comment
 cat > lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
@@ -89,9 +88,6 @@ $sleep
 
 # New lexer, with 'fubar' comment.
 cat > ../lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
@@ -112,9 +108,6 @@ $sleep
 
 # New lexer, with 'maude' comment.
 cat > ../lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
diff --git a/t/silent-lex.sh b/t/silent-lex.sh
index cfe1a9b5d..e424afc38 100644
--- a/t/silent-lex.sh
+++ b/t/silent-lex.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 EOF
 
 cat > Makefile.am <<'EOF'
+AM_LFLAGS = --never-interactive
+
 # Need generic and non-generic rules.
 bin_PROGRAMS = foo1 foo2
 foo1_SOURCES = foo.l
@@ -40,6 +42,8 @@ EOF
 
 cat > sub/Makefile.am <<'EOF'
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 # Need generic and non-generic rules.
 bin_PROGRAMS = bar1 bar2
 bar1_SOURCES = bar.l
@@ -50,9 +54,6 @@ LDADD = $(LEXLIB)
 EOF
 
 cat > foo.l <<'EOF'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"   return EOF;
 .
diff --git a/t/silent-many-languages.sh b/t/silent-many-languages.sh
index 4edb46884..85773d339 100644
--- a/t/silent-many-languages.sh
+++ b/t/silent-many-languages.sh
@@ -151,6 +151,7 @@ ba2_YFLAGS = -v
 ba2_LFLAGS = -n
 ba2_LDADD = $(LEXLIB)
 AM_YFLAGS = -d
+AM_LFLAGS = --never-interactive
 BUILT_SOURCES = baz6.h
 EOF
 
diff --git a/t/silent-yacc-headers.sh b/t/silent-yacc-headers.sh
index 98ae45b8a..f64342c82 100644
--- a/t/silent-yacc-headers.sh
+++ b/t/silent-yacc-headers.sh
@@ -31,6 +31,7 @@ EOF
 cat > Makefile.am <<'EOF'
 # Need generic and non-generic rules.
 AM_YFLAGS = -d
+AM_LFLAGS = --never-interactive
 bin_PROGRAMS = foo bar
 foo_SOURCES = parse.y
 bar_SOURCES = $(foo_SOURCES)
diff --git a/t/silent-yacc.sh b/t/silent-yacc.sh
index 9645aff83..d89ff49a7 100644
--- a/t/silent-yacc.sh
+++ b/t/silent-yacc.sh
@@ -29,6 +29,8 @@ AC_OUTPUT
 EOF
 
 cat > Makefile.am <<'EOF'
+AM_LFLAGS = --never-interactive
+
 # Need generic and non-generic rules.
 bin_PROGRAMS = foo1 foo2
 foo1_SOURCES = foo.y
@@ -40,6 +42,8 @@ EOF
 
 cat > sub/Makefile.am <<'EOF'
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 # Need generic and non-generic rules.
 bin_PROGRAMS = bar1 bar2
 bar1_SOURCES = bar.y
diff --git a/t/subpkg-yacc.sh b/t/subpkg-yacc.sh
index edd14532b..782ee0957 100644
--- a/t/subpkg-yacc.sh
+++ b/t/subpkg-yacc.sh
@@ -61,6 +61,8 @@ AC_OUTPUT
 EOF
 
 cat >lib/Makefile.am <<'EOF'
+AM_LFLAGS = --never-interactive
+
 noinst_LIBRARIES = liblib.a
 liblib_a_SOURCES = src/x.c foo.y
 EXTRA_liblib_a_SOURCES = bar.y
diff --git a/t/suffix10.tap b/t/suffix10.tap
index 3869d07fd..8d3dc1756 100644
--- a/t/suffix10.tap
+++ b/t/suffix10.tap
@@ -31,6 +31,8 @@ AC_OUTPUT
 EOF
 
 cat >Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 lib_LTLIBRARIES = libfoo.la
 libfoo_la_SOURCES = foo.x_
 .x_.y:
diff --git a/t/yacc-auxdir.sh b/t/yacc-auxdir.sh
index be8ac4fd4..f6ff7de48 100644
--- a/t/yacc-auxdir.sh
+++ b/t/yacc-auxdir.sh
@@ -35,12 +35,16 @@ cat > Makefile.am << 'END'
 SUBDIRS = sub
 bin_PROGRAMS = foo
 AM_YFLAGS = -d
+AM_LFLAGS = --never-interactive
+
 foo_SOURCES = foo.y
 END
 
 cat > sub/Makefile.am << 'END'
 bin_PROGRAMS = bar
 AM_YFLAGS = -d
+AM_LFLAGS = --never-interactive
+
 bar_SOURCES = bar.y main.c
 END
 
diff --git a/t/yacc-basic.sh b/t/yacc-basic.sh
index b7a35bd39..51ee5f6a3 100644
--- a/t/yacc-basic.sh
+++ b/t/yacc-basic.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = parse.y foo.c
 bar_SOURCES = $(foo_SOURCES)
diff --git a/t/yacc-bison-skeleton-cxx.sh b/t/yacc-bison-skeleton-cxx.sh
index bded1a34f..da76238fa 100644
--- a/t/yacc-bison-skeleton-cxx.sh
+++ b/t/yacc-bison-skeleton-cxx.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zardoz
 zardoz_SOURCES = zardoz.yy foo.cc
 
diff --git a/t/yacc-bison-skeleton.sh b/t/yacc-bison-skeleton.sh
index b77b29f1e..11b64b831 100644
--- a/t/yacc-bison-skeleton.sh
+++ b/t/yacc-bison-skeleton.sh
@@ -31,6 +31,8 @@ cat > Makefile.am << 'END'
 bin_PROGRAMS = zardoz
 zardoz_SOURCES = zardoz.y foo.c
 AM_YFLAGS = -d --skeleton glr.c
+AM_LFLAGS = --never-interactive
+
 BUILT_SOURCES = zardoz.h
 END
 
diff --git a/t/yacc-clean-cxx.sh b/t/yacc-clean-cxx.sh
index d12e02308..71eb4f315 100644
--- a/t/yacc-clean-cxx.sh
+++ b/t/yacc-clean-cxx.sh
@@ -39,6 +39,8 @@ END
 mkdir sub1 sub2
 
 cat > sub1/Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar baz qux
 
 foo_SOURCES = mainfoo.cc parsefoo.yxx
diff --git a/t/yacc-clean.sh b/t/yacc-clean.sh
index 0baf0afd8..d0f793843 100644
--- a/t/yacc-clean.sh
+++ b/t/yacc-clean.sh
@@ -38,6 +38,8 @@ END
 mkdir sub1 sub2
 
 cat > sub1/Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar baz qux
 
 foo_SOURCES = main.c parse.y
diff --git a/t/yacc-cxx-grepping.sh b/t/yacc-cxx-grepping.sh
index 7b3a6bc5e..e094d5f16 100644
--- a/t/yacc-cxx-grepping.sh
+++ b/t/yacc-cxx-grepping.sh
@@ -27,6 +27,8 @@ AC_PROG_YACC
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar baz qux
 foo_SOURCES = foo.y++
 bar_SOURCES = bar.ypp
diff --git a/t/yacc-cxx.sh b/t/yacc-cxx.sh
index 1bf75a975..52fca8c01 100644
--- a/t/yacc-cxx.sh
+++ b/t/yacc-cxx.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo1 foo2 foo3 foo4
 foo1_SOURCES = parse1.yy  foo.cc
 foo2_SOURCES = parse2.y++ bar.c++
diff --git a/t/yacc-d-basic.sh b/t/yacc-d-basic.sh
index fe80a0888..166111fdb 100644
--- a/t/yacc-d-basic.sh
+++ b/t/yacc-d-basic.sh
@@ -35,6 +35,8 @@ END
 mkdir foo bar baz
 
 cat > foo/Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zardoz
 zardoz_SOURCES = parse.y main.c
 .PHONY: echo-distcom
diff --git a/t/yacc-d-cxx.sh b/t/yacc-d-cxx.sh
index 56f43c940..5f9a09a46 100644
--- a/t/yacc-d-cxx.sh
+++ b/t/yacc-d-cxx.sh
@@ -67,6 +67,8 @@ mkdir foo bar baz qux baz/sub
 
 # These makefiles will be extended later.
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 .PHONY: echo-distcom
 echo-distcom:
 	@echo ' ' $(DIST_COMMON) ' '
diff --git a/t/yacc-d-vpath.sh b/t/yacc-d-vpath.sh
index dced4818f..3dcf17ade 100644
--- a/t/yacc-d-vpath.sh
+++ b/t/yacc-d-vpath.sh
@@ -32,6 +32,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = parse.y foo.c
 AM_YFLAGS = -d
diff --git a/t/yacc-deleted-headers.sh b/t/yacc-deleted-headers.sh
index c3fdbeee4..8c27dcefb 100644
--- a/t/yacc-deleted-headers.sh
+++ b/t/yacc-deleted-headers.sh
@@ -26,6 +26,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = p1 p2 p3 p4
 # The order in which files are listed in the p*_SOURCES variables
 # below is significant, since it causes make failures whenever
diff --git a/t/yacc-depend.sh b/t/yacc-depend.sh
index cf544359f..d1e09bc39 100644
--- a/t/yacc-depend.sh
+++ b/t/yacc-depend.sh
@@ -29,6 +29,8 @@ END
 cat > Makefile.am << 'END'
 bin_PROGRAMS = foo
 AM_YFLAGS = -d
+AM_LFLAGS = --never-interactive
+
 foo_SOURCES = foo.y main.c
 BUILT_SOURCES = foo.h
 END
diff --git a/t/yacc-depend2.sh b/t/yacc-depend2.sh
index a61e4957d..a52d4489f 100644
--- a/t/yacc-depend2.sh
+++ b/t/yacc-depend2.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 AM_YFLAGS = -d
 foo_SOURCES = foo.y main.c
diff --git a/t/yacc-dist-nobuild-subdir.sh b/t/yacc-dist-nobuild-subdir.sh
index d1788811f..56320fe48 100644
--- a/t/yacc-dist-nobuild-subdir.sh
+++ b/t/yacc-dist-nobuild-subdir.sh
@@ -49,6 +49,8 @@ END
 
 cat > Makefile.am <<'END'
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 noinst_PROGRAMS = foo bar
 foo_SOURCES = sub/parse.y
 bar_SOURCES = $(foo_SOURCES)
diff --git a/t/yacc-dist-nobuild.sh b/t/yacc-dist-nobuild.sh
index a30fefec2..71be0d52c 100644
--- a/t/yacc-dist-nobuild.sh
+++ b/t/yacc-dist-nobuild.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foobar zardoz
 foobar_SOURCES = parse.y main.c
 zardoz_SOURCES = $(foobar_SOURCES)
diff --git a/t/yacc-dry.sh b/t/yacc-dry.sh
index 9b08d3863..6500ba811 100644
--- a/t/yacc-dry.sh
+++ b/t/yacc-dry.sh
@@ -26,6 +26,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 AM_YFLAGS = -d
 bin_PROGRAMS = foo
 foo_SOURCES = foo.c parse.y
diff --git a/t/yacc-grepping.sh b/t/yacc-grepping.sh
index b0cf91353..67381ba89 100644
--- a/t/yacc-grepping.sh
+++ b/t/yacc-grepping.sh
@@ -35,6 +35,8 @@ END
 $ACLOCAL
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zardoz
 zardoz_SOURCES = zardoz.y
 END
diff --git a/t/yacc-grepping2.sh b/t/yacc-grepping2.sh
index 159dd3e15..4af321fbe 100644
--- a/t/yacc-grepping2.sh
+++ b/t/yacc-grepping2.sh
@@ -25,6 +25,8 @@ AC_PROG_YACC
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = maude
 maude_SOURCES = sub/maude.y
 END
diff --git a/t/yacc-headers-and-dist-pr47.sh b/t/yacc-headers-and-dist-pr47.sh
index 57c8251ad..74ec525f9 100644
--- a/t/yacc-headers-and-dist-pr47.sh
+++ b/t/yacc-headers-and-dist-pr47.sh
@@ -30,6 +30,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = foo.y
 AM_YFLAGS = -d
diff --git a/t/yacc-line.sh b/t/yacc-line.sh
index e7a4d6244..2319c9791 100644
--- a/t/yacc-line.sh
+++ b/t/yacc-line.sh
@@ -32,6 +32,8 @@ END
 mkdir dir sub sub/dir
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 SUBDIRS = sub
 bin_PROGRAMS = foo bar
 AM_YFLAGS = -d
@@ -45,6 +47,8 @@ END
 
 cat > sub/Makefile.am << 'END'
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 noinst_PROGRAMS = foo bar
 foo_YFLAGS = -d
 foo_SOURCES = zardoz.y
diff --git a/t/yacc-misc.sh b/t/yacc-misc.sh
index 2bfb0c55e..fcc19aa49 100644
--- a/t/yacc-misc.sh
+++ b/t/yacc-misc.sh
@@ -26,6 +26,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = parse.y foo.c
 bar_SOURCES = bar.y foo.c
diff --git a/t/yacc-mix-c-cxx.sh b/t/yacc-mix-c-cxx.sh
index a73935c39..bb58bb6fa 100644
--- a/t/yacc-mix-c-cxx.sh
+++ b/t/yacc-mix-c-cxx.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = c1 c2 cxx1 cxx2 cxx3
 AM_YFLAGS = -d
 
diff --git a/t/yacc-nodist.sh b/t/yacc-nodist.sh
index dbb86bdb2..8e5338e94 100644
--- a/t/yacc-nodist.sh
+++ b/t/yacc-nodist.sh
@@ -31,6 +31,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 SUBDIRS = sub1 sub2
 .PHONY: test-build test-dist
 test-build: all
diff --git a/t/yacc-pr204.sh b/t/yacc-pr204.sh
index 91882e4d7..89acb1ee0 100644
--- a/t/yacc-pr204.sh
+++ b/t/yacc-pr204.sh
@@ -34,6 +34,8 @@ EOF
 # sure Automake match 'nodist_' against the right
 # variable name...
 cat > Makefile.am << 'EOF'
+AM_LFLAGS = --never-interactive
+
 AM_YFLAGS = -d
 EXTRA_PROGRAMS = foo
 PARSE2 = parse2.y
diff --git a/t/yacc-subdir.sh b/t/yacc-subdir.sh
index df31a3c51..d6c3f0cc8 100644
--- a/t/yacc-subdir.sh
+++ b/t/yacc-subdir.sh
@@ -28,6 +28,8 @@ END
 
 cat > Makefile.am << 'END'
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo/foo
 foo_foo_SOURCES = foo/parse.y
 AM_YFLAGS = -d
diff --git a/t/yacc-vpath.sh b/t/yacc-vpath.sh
index 52d2c45bd..42044ecf2 100644
--- a/t/yacc-vpath.sh
+++ b/t/yacc-vpath.sh
@@ -32,6 +32,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = parse.y foo.c
 END
diff --git a/t/yacc-weirdnames.sh b/t/yacc-weirdnames.sh
index 60f199d2d..8397bc636 100644
--- a/t/yacc-weirdnames.sh
+++ b/t/yacc-weirdnames.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar foo2 bar2
 
 foo_SOURCES = parse.y.y
diff --git a/t/yflags-cmdline-override.sh b/t/yflags-cmdline-override.sh
index 37304645c..73982753a 100644
--- a/t/yflags-cmdline-override.sh
+++ b/t/yflags-cmdline-override.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = foo.y
 # A minor automake wart: automake doesn't generate code to clean
diff --git a/t/yflags-cxx.sh b/t/yflags-cxx.sh
index 9bd28b8ce..2596a95e3 100644
--- a/t/yflags-cxx.sh
+++ b/t/yflags-cxx.sh
@@ -39,6 +39,8 @@ END
 
 cat > Makefile.am <<'END'
 AUTOMAKE_OPTIONS = no-dependencies
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = main.cc foo.yy
 bar_SOURCES = main.cc bar.y++
diff --git a/t/yflags-d-false-positives.sh b/t/yflags-d-false-positives.sh
index 21efb2345..666dbe938 100644
--- a/t/yflags-d-false-positives.sh
+++ b/t/yflags-d-false-positives.sh
@@ -26,6 +26,8 @@ END
 $ACLOCAL
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zardoz foobar
 zardoz_SOURCES = zardoz.y
 foobar_SOURCES = foobar.y
diff --git a/t/yflags-force-conditional.sh b/t/yflags-force-conditional.sh
index 3f9a13293..976b6f782 100644
--- a/t/yflags-force-conditional.sh
+++ b/t/yflags-force-conditional.sh
@@ -38,6 +38,8 @@ YACC=fake-yacc; export YACC
 
 cat > Makefile.am <<'END'
 AUTOMAKE_OPTIONS = no-dependencies
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = foo.y main.c
 bar_SOURCES = $(foo_SOURCES)
diff --git a/t/yflags-force-override.sh b/t/yflags-force-override.sh
index b1c36ef0f..7c865935b 100644
--- a/t/yflags-force-override.sh
+++ b/t/yflags-force-override.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = foo.y
 # Don't do this in a real-life Makefile.am!
diff --git a/t/yflags-var-expand.sh b/t/yflags-var-expand.sh
index 0e06e0d9c..bf34922a6 100644
--- a/t/yflags-var-expand.sh
+++ b/t/yflags-var-expand.sh
@@ -29,6 +29,8 @@ END
 $ACLOCAL
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = foo.y
 bar_SOURCES = bar.y
diff --git a/t/yflags.sh b/t/yflags.sh
index 1f73776f8..2359a76b7 100644
--- a/t/yflags.sh
+++ b/t/yflags.sh
@@ -39,6 +39,8 @@ END
 
 cat > Makefile.am <<'END'
 AUTOMAKE_OPTIONS = no-dependencies
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = main.c foo.y
 bar_SOURCES = main.c bar.y
-- 
2.39.0

Message #32 received at 59994 <at> debbugs.gnu.org (full text, mbox):

From: Karl Berry <karl <at> freefriends.org>
To: fberat <at> redhat.com
Cc: 59994 <at> debbugs.gnu.org
Subject: Re: [bug#59994] [PATCH v2] tests: Don't try to prevent flex to include
 unistd.h
Date: Mon, 28 Aug 2023 19:33:15 -0600

    In current version of flex, not having this header leads to implicit
    function declarations that are not compatible with c99 standard.

    On top of that, while flex dedicated test were having this macro set,
    the yacc ones didn't have it despise their use of Flex.

    For consistency, all the YACC/Flex related tests now have the
    "--never-interactive" option set in AM_LFLAGS.

I installed this change. Thank you for all that laborious effort to
change all the yacc/flex tests. All the tests passed for me after
applying the patches.

For the record, a couple of the diffs (lex-clean-cxx.sh,
lex-depend-cxx.sh) did not apply as written, since the prior
extern "C" line had already been changed to be conditional, e.g.,
this failed:

    --- t/lex-clean-cxx.sh
    +++ t/lex-clean-cxx.sh
    @@ -57,8 +59,6 @@ cat > parsefoo.lxx << 'END'
     %{
     #define YY_DECL int yylex (void)
     extern "C" YY_DECL;
    -#define YY_NO_UNISTD_H 1
    -int isatty (int fd) { return 0; }
     %}
     %%
     "GOOD"   return EOF;

I simply removed the #define YY_NO_UNISTD_H and int isatty lines
by hand. Final diff before commit is included below.

Thanks again,
Karl

diff --git a/t/cond35.sh b/t/cond35.sh
index dc3b8aae9..8b044644e 100644
--- a/t/cond35.sh
+++ b/t/cond35.sh
@@ -30,6 +30,7 @@ EOF
 
 cat > Makefile.am <<'EOF'
 AM_YFLAGS               =       -d
+AM_LFLAGS               =       --never-interactive
 
 BUILT_SOURCES           =       tparse.h
 
@@ -58,9 +59,6 @@ $FGREP 'tparse.h' Makefile.in # For debugging.
 test $($FGREP -c 'tparse.h:' Makefile.in) -eq 1
 
 cat > tscan.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"   return EOF;
 %%
diff --git a/t/lex-clean-cxx.sh b/t/lex-clean-cxx.sh
index 8a086304f..fea054457 100644
--- a/t/lex-clean-cxx.sh
+++ b/t/lex-clean-cxx.sh
@@ -29,6 +29,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar baz qux
 
 foo_SOURCES = mainfoo.cc parsefoo.lxx
@@ -60,8 +62,6 @@ cat > parsefoo.lxx << 'END'
 extern "C"
 #endif
 YY_DECL;
-#define YY_NO_UNISTD_H 1
-int isatty (int fd) { return 0; }
 %}
 %%
 "GOOD"   return EOF;
diff --git a/t/lex-clean.sh b/t/lex-clean.sh
index 1ee7d8f5b..4668e97c7 100644
--- a/t/lex-clean.sh
+++ b/t/lex-clean.sh
@@ -29,6 +29,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar baz qux
 
 foo_SOURCES = main.c lexer.l
@@ -52,9 +54,6 @@ LDADD = $(LEXLIB)
 END
 
 cat > lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex-depend-cxx.sh b/t/lex-depend-cxx.sh
index 682b2ccc5..cc7004eab 100644
--- a/t/lex-depend-cxx.sh
+++ b/t/lex-depend-cxx.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 noinst_PROGRAMS = joe moe
 joe_SOURCES = joe.ll
 moe_SOURCES = moe.l++
@@ -53,8 +55,6 @@ cat > joe.ll << 'END'
 extern "C"
 #endif
 YY_DECL;
-#define YY_NO_UNISTD_H 1
-int isatty (int fd) { return 0; }
 %}
 %%
 "foo" return EOF;
diff --git a/t/lex-depend.sh b/t/lex-depend.sh
index 16f937ef1..68cc5ee7b 100644
--- a/t/lex-depend.sh
+++ b/t/lex-depend.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zoo
 zoo_SOURCES = joe.l
 LDADD = $(LEXLIB)
@@ -42,9 +44,6 @@ test-obj-updated: joe.$(OBJEXT)
 END
 
 cat > joe.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "foo" return EOF;
 .
diff --git a/t/lex-header.sh b/t/lex-header.sh
index 22567642e..48b42457a 100644
--- a/t/lex-header.sh
+++ b/t/lex-header.sh
@@ -33,6 +33,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = lexer.l main.c mylex.h
 foo_LFLAGS = --header-file=mylex.h
@@ -45,9 +47,6 @@ END
 
 cat > lexer.l << 'END'
 %option noyywrap
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
@@ -55,7 +54,6 @@ cat > lexer.l << 'END'
 END
 
 cat > main.c <<'END'
-#define YY_NO_UNISTD_H 1
 #include "mylex.h"
 int main (void)
 {
diff --git a/t/lex-lib-external.sh b/t/lex-lib-external.sh
index 85403612f..25ad2a39b 100644
--- a/t/lex-lib-external.sh
+++ b/t/lex-lib-external.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = lexer
 lexer_SOURCES = foo.l
 lexer_LDADD = $(LEXLIB)
@@ -42,9 +44,6 @@ have-lexlib:
 END
 
 cat > foo.l <<'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex-lib.sh b/t/lex-lib.sh
index f0a0d37f6..7734fd228 100644
--- a/t/lex-lib.sh
+++ b/t/lex-lib.sh
@@ -31,6 +31,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = lexer
 lexer_SOURCES = foo.l
 lexer_LDADD = $(LEXLIB)
@@ -47,9 +49,6 @@ int yywrap (void)
 END
 
 cat > foo.l <<'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
diff --git a/t/lex-libobj.sh b/t/lex-libobj.sh
index b26381fcf..6e36a98ed 100644
--- a/t/lex-libobj.sh
+++ b/t/lex-libobj.sh
@@ -32,6 +32,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 noinst_PROGRAMS = foo
 foo_SOURCES = foo.l
 foo_LDADD = $(LEXLIB) $(LIBOBJS)
@@ -45,9 +47,6 @@ int yywrap (void)
 END
 
 cat > foo.l <<'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
diff --git a/t/lex-line.sh b/t/lex-line.sh
index 340800ef2..5f9145847 100644
--- a/t/lex-line.sh
+++ b/t/lex-line.sh
@@ -32,6 +32,8 @@ END
 mkdir dir sub sub/dir
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 SUBDIRS = sub
 bin_PROGRAMS = foo bar
 LDADD = $(LEXLIB)
@@ -44,6 +46,8 @@ bar-quux.@OBJEXT@: bar-quux.c
 END
 
 cat > sub/Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 AUTOMAKE_OPTIONS = subdir-objects
 noinst_PROGRAMS = foo bar
 ## We already used $(LEXLIB) above, so try @LEXLIB@ now.
@@ -57,9 +61,6 @@ dir/quux.@OBJEXT@: dir/quux.c
 END
 
 cat > zardoz.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"  return EOF;
 .
diff --git a/t/lex-multiple.sh b/t/lex-multiple.sh
index 9565bd6b8..6486a012f 100644
--- a/t/lex-multiple.sh
+++ b/t/lex-multiple.sh
@@ -31,7 +31,9 @@ AC_PROG_RANLIB
 AC_OUTPUT
 END
 
-cat > Makefile.am << 'END'
+cat > Makefile.am <<  'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zardoz
 
 zardoz_SOURCES = main.c
@@ -72,9 +74,6 @@ int main (int argc, char *argv[])
 END
 
 cat > 0.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "VANILLA" { printf (":%s:\n", yytext); return 121; }
 . { printf (":%s:\n", yytext); return 1; }
diff --git a/t/lex-nodist.sh b/t/lex-nodist.sh
index 73e23a13e..d499aea7f 100644
--- a/t/lex-nodist.sh
+++ b/t/lex-nodist.sh
@@ -31,6 +31,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 .PHONY: test-build test-dist
 test-build: all
 	ls -l
@@ -45,9 +47,6 @@ check-local: test-build test-dist
 lexer.l:
 	rm -f $@ $@-t
 	:; { : \
-	  && echo '%{' \
-	  && echo '#define YY_NO_UNISTD_H 1' \
-	  && echo '%}' \
 	  && echo '%%' \
 	  && echo '"GOOD" return EOF;' \
 	  && echo '.'; \
diff --git a/t/lex-noyywrap.sh b/t/lex-noyywrap.sh
index 1c61a1ab3..5ec68b9ba 100644
--- a/t/lex-noyywrap.sh
+++ b/t/lex-noyywrap.sh
@@ -26,6 +26,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = foo.l
 
@@ -37,9 +39,6 @@ END
 
 cat > foo.l << 'END'
 %option noyywrap
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex-pr204.sh b/t/lex-pr204.sh
index ebfaafef5..cbad1c266 100644
--- a/t/lex-pr204.sh
+++ b/t/lex-pr204.sh
@@ -35,6 +35,8 @@ EOF
 # The LEXER2 intermediate variable is there to make sure Automake
 # matches 'nodist_' against the right variable name...
 cat > Makefile.am << 'EOF'
+AM_LFLAGS = --never-interactive
+
 EXTRA_PROGRAMS = foo
 LEXER2 = lexer2.l
 nodist_foo_SOURCES = lexer.l $(LEXER2)
@@ -49,9 +51,6 @@ distdirtest: distdir
 EOF
 
 cat > lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex-subobj-nodep.sh b/t/lex-subobj-nodep.sh
index f8bb87a9c..8ef4d68b1 100644
--- a/t/lex-subobj-nodep.sh
+++ b/t/lex-subobj-nodep.sh
@@ -28,6 +28,8 @@ END
 
 cat >Makefile.am <<\END
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = p1 p2
 p1_SOURCES = sub1/s1.l
 p2_SOURCES = sub2/s2.l
@@ -37,9 +39,6 @@ END
 mkdir sub1 sub2
 
 cat >sub1/s1.l <<\END
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"   return EOF;
 .
diff --git a/t/lex3.sh b/t/lex3.sh
index 41b87dc06..4a20f85da 100644
--- a/t/lex3.sh
+++ b/t/lex3.sh
@@ -28,14 +28,13 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 noinst_PROGRAMS = foo
 foo_SOURCES = foo.l
 END
 
 cat > foo.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "GOOD"   return EOF;
 .
diff --git a/t/lex5.sh b/t/lex5.sh
index 3d84d9b41..687903e65 100644
--- a/t/lex5.sh
+++ b/t/lex5.sh
@@ -28,6 +28,7 @@ END
 cat > Makefile.am << 'END'
 AUTOMAKE_OPTIONS  = subdir-objects
 LDADD             = @LEXLIB@
+AM_LFLAGS         = --never-interactive
 
 bin_PROGRAMS    = foo/foo
 foo_foo_SOURCES = foo/foo.l
@@ -36,9 +37,6 @@ END
 mkdir foo
 
 cat > foo/foo.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"   return EOF;
 .
diff --git a/t/lexvpath.sh b/t/lexvpath.sh
index 5185a1f71..d064fd2bd 100644
--- a/t/lexvpath.sh
+++ b/t/lexvpath.sh
@@ -37,6 +37,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = lexer.l foo.c
 LDADD = $(LEXLIB)
@@ -44,9 +46,6 @@ END
 
 # Original lexer, with a "foobar" comment
 cat > lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
@@ -89,9 +88,6 @@ $sleep
 
 # New lexer, with 'fubar' comment.
 cat > ../lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
@@ -112,9 +108,6 @@ $sleep
 
 # New lexer, with 'maude' comment.
 cat > ../lexer.l << 'END'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END" return EOF;
 .
diff --git a/t/silent-lex.sh b/t/silent-lex.sh
index cfe1a9b5d..e424afc38 100644
--- a/t/silent-lex.sh
+++ b/t/silent-lex.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 EOF
 
 cat > Makefile.am <<'EOF'
+AM_LFLAGS = --never-interactive
+
 # Need generic and non-generic rules.
 bin_PROGRAMS = foo1 foo2
 foo1_SOURCES = foo.l
@@ -40,6 +42,8 @@ EOF
 
 cat > sub/Makefile.am <<'EOF'
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 # Need generic and non-generic rules.
 bin_PROGRAMS = bar1 bar2
 bar1_SOURCES = bar.l
@@ -50,9 +54,6 @@ LDADD = $(LEXLIB)
 EOF
 
 cat > foo.l <<'EOF'
-%{
-#define YY_NO_UNISTD_H 1
-%}
 %%
 "END"   return EOF;
 .
diff --git a/t/silent-many-languages.sh b/t/silent-many-languages.sh
index 4edb46884..85773d339 100644
--- a/t/silent-many-languages.sh
+++ b/t/silent-many-languages.sh
@@ -151,6 +151,7 @@ ba2_YFLAGS = -v
 ba2_LFLAGS = -n
 ba2_LDADD = $(LEXLIB)
 AM_YFLAGS = -d
+AM_LFLAGS = --never-interactive
 BUILT_SOURCES = baz6.h
 EOF
 
diff --git a/t/silent-yacc-headers.sh b/t/silent-yacc-headers.sh
index 98ae45b8a..f64342c82 100644
--- a/t/silent-yacc-headers.sh
+++ b/t/silent-yacc-headers.sh
@@ -31,6 +31,7 @@ EOF
 cat > Makefile.am <<'EOF'
 # Need generic and non-generic rules.
 AM_YFLAGS = -d
+AM_LFLAGS = --never-interactive
 bin_PROGRAMS = foo bar
 foo_SOURCES = parse.y
 bar_SOURCES = $(foo_SOURCES)
diff --git a/t/silent-yacc.sh b/t/silent-yacc.sh
index 9645aff83..d89ff49a7 100644
--- a/t/silent-yacc.sh
+++ b/t/silent-yacc.sh
@@ -29,6 +29,8 @@ AC_OUTPUT
 EOF
 
 cat > Makefile.am <<'EOF'
+AM_LFLAGS = --never-interactive
+
 # Need generic and non-generic rules.
 bin_PROGRAMS = foo1 foo2
 foo1_SOURCES = foo.y
@@ -40,6 +42,8 @@ EOF
 
 cat > sub/Makefile.am <<'EOF'
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 # Need generic and non-generic rules.
 bin_PROGRAMS = bar1 bar2
 bar1_SOURCES = bar.y
diff --git a/t/subpkg-yacc.sh b/t/subpkg-yacc.sh
index edd14532b..782ee0957 100644
--- a/t/subpkg-yacc.sh
+++ b/t/subpkg-yacc.sh
@@ -61,6 +61,8 @@ AC_OUTPUT
 EOF
 
 cat >lib/Makefile.am <<'EOF'
+AM_LFLAGS = --never-interactive
+
 noinst_LIBRARIES = liblib.a
 liblib_a_SOURCES = src/x.c foo.y
 EXTRA_liblib_a_SOURCES = bar.y
diff --git a/t/suffix10.tap b/t/suffix10.tap
index 3869d07fd..8d3dc1756 100644
--- a/t/suffix10.tap
+++ b/t/suffix10.tap
@@ -31,6 +31,8 @@ AC_OUTPUT
 EOF
 
 cat >Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 lib_LTLIBRARIES = libfoo.la
 libfoo_la_SOURCES = foo.x_
 .x_.y:
diff --git a/t/yacc-auxdir.sh b/t/yacc-auxdir.sh
index be8ac4fd4..f6ff7de48 100644
--- a/t/yacc-auxdir.sh
+++ b/t/yacc-auxdir.sh
@@ -35,12 +35,16 @@ cat > Makefile.am << 'END'
 SUBDIRS = sub
 bin_PROGRAMS = foo
 AM_YFLAGS = -d
+AM_LFLAGS = --never-interactive
+
 foo_SOURCES = foo.y
 END
 
 cat > sub/Makefile.am << 'END'
 bin_PROGRAMS = bar
 AM_YFLAGS = -d
+AM_LFLAGS = --never-interactive
+
 bar_SOURCES = bar.y main.c
 END
 
diff --git a/t/yacc-basic.sh b/t/yacc-basic.sh
index b7a35bd39..51ee5f6a3 100644
--- a/t/yacc-basic.sh
+++ b/t/yacc-basic.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = parse.y foo.c
 bar_SOURCES = $(foo_SOURCES)
diff --git a/t/yacc-bison-skeleton-cxx.sh b/t/yacc-bison-skeleton-cxx.sh
index bded1a34f..da76238fa 100644
--- a/t/yacc-bison-skeleton-cxx.sh
+++ b/t/yacc-bison-skeleton-cxx.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zardoz
 zardoz_SOURCES = zardoz.yy foo.cc
 
diff --git a/t/yacc-bison-skeleton.sh b/t/yacc-bison-skeleton.sh
index b77b29f1e..11b64b831 100644
--- a/t/yacc-bison-skeleton.sh
+++ b/t/yacc-bison-skeleton.sh
@@ -31,6 +31,8 @@ cat > Makefile.am << 'END'
 bin_PROGRAMS = zardoz
 zardoz_SOURCES = zardoz.y foo.c
 AM_YFLAGS = -d --skeleton glr.c
+AM_LFLAGS = --never-interactive
+
 BUILT_SOURCES = zardoz.h
 END
 
diff --git a/t/yacc-clean-cxx.sh b/t/yacc-clean-cxx.sh
index d12e02308..71eb4f315 100644
--- a/t/yacc-clean-cxx.sh
+++ b/t/yacc-clean-cxx.sh
@@ -39,6 +39,8 @@ END
 mkdir sub1 sub2
 
 cat > sub1/Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar baz qux
 
 foo_SOURCES = mainfoo.cc parsefoo.yxx
diff --git a/t/yacc-clean.sh b/t/yacc-clean.sh
index 0baf0afd8..d0f793843 100644
--- a/t/yacc-clean.sh
+++ b/t/yacc-clean.sh
@@ -38,6 +38,8 @@ END
 mkdir sub1 sub2
 
 cat > sub1/Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar baz qux
 
 foo_SOURCES = main.c parse.y
diff --git a/t/yacc-cxx-grepping.sh b/t/yacc-cxx-grepping.sh
index 7b3a6bc5e..e094d5f16 100644
--- a/t/yacc-cxx-grepping.sh
+++ b/t/yacc-cxx-grepping.sh
@@ -27,6 +27,8 @@ AC_PROG_YACC
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar baz qux
 foo_SOURCES = foo.y++
 bar_SOURCES = bar.ypp
diff --git a/t/yacc-cxx.sh b/t/yacc-cxx.sh
index 5b385870c..0ce4116dd 100644
--- a/t/yacc-cxx.sh
+++ b/t/yacc-cxx.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo1 foo2 foo3 foo4
 foo1_SOURCES = parse1.yy  foo.cc
 foo2_SOURCES = parse2.y++ bar.c++
diff --git a/t/yacc-d-basic.sh b/t/yacc-d-basic.sh
index fe80a0888..166111fdb 100644
--- a/t/yacc-d-basic.sh
+++ b/t/yacc-d-basic.sh
@@ -35,6 +35,8 @@ END
 mkdir foo bar baz
 
 cat > foo/Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zardoz
 zardoz_SOURCES = parse.y main.c
 .PHONY: echo-distcom
diff --git a/t/yacc-d-cxx.sh b/t/yacc-d-cxx.sh
index 576e8e2aa..40247d3c8 100644
--- a/t/yacc-d-cxx.sh
+++ b/t/yacc-d-cxx.sh
@@ -70,6 +70,8 @@ mkdir foo bar baz qux baz/sub
 
 # These makefiles will be extended later.
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 .PHONY: echo-distcom
 echo-distcom:
 	@echo ' ' $(DIST_COMMON) ' '
diff --git a/t/yacc-d-vpath.sh b/t/yacc-d-vpath.sh
index dced4818f..3dcf17ade 100644
--- a/t/yacc-d-vpath.sh
+++ b/t/yacc-d-vpath.sh
@@ -32,6 +32,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = parse.y foo.c
 AM_YFLAGS = -d
diff --git a/t/yacc-deleted-headers.sh b/t/yacc-deleted-headers.sh
index c3fdbeee4..8c27dcefb 100644
--- a/t/yacc-deleted-headers.sh
+++ b/t/yacc-deleted-headers.sh
@@ -26,6 +26,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = p1 p2 p3 p4
 # The order in which files are listed in the p*_SOURCES variables
 # below is significant, since it causes make failures whenever
diff --git a/t/yacc-depend.sh b/t/yacc-depend.sh
index cf544359f..d1e09bc39 100644
--- a/t/yacc-depend.sh
+++ b/t/yacc-depend.sh
@@ -29,6 +29,8 @@ END
 cat > Makefile.am << 'END'
 bin_PROGRAMS = foo
 AM_YFLAGS = -d
+AM_LFLAGS = --never-interactive
+
 foo_SOURCES = foo.y main.c
 BUILT_SOURCES = foo.h
 END
diff --git a/t/yacc-depend2.sh b/t/yacc-depend2.sh
index a61e4957d..a52d4489f 100644
--- a/t/yacc-depend2.sh
+++ b/t/yacc-depend2.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 AM_YFLAGS = -d
 foo_SOURCES = foo.y main.c
diff --git a/t/yacc-dist-nobuild-subdir.sh b/t/yacc-dist-nobuild-subdir.sh
index d1788811f..56320fe48 100644
--- a/t/yacc-dist-nobuild-subdir.sh
+++ b/t/yacc-dist-nobuild-subdir.sh
@@ -49,6 +49,8 @@ END
 
 cat > Makefile.am <<'END'
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 noinst_PROGRAMS = foo bar
 foo_SOURCES = sub/parse.y
 bar_SOURCES = $(foo_SOURCES)
diff --git a/t/yacc-dist-nobuild.sh b/t/yacc-dist-nobuild.sh
index a30fefec2..71be0d52c 100644
--- a/t/yacc-dist-nobuild.sh
+++ b/t/yacc-dist-nobuild.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foobar zardoz
 foobar_SOURCES = parse.y main.c
 zardoz_SOURCES = $(foobar_SOURCES)
diff --git a/t/yacc-dry.sh b/t/yacc-dry.sh
index 9b08d3863..6500ba811 100644
--- a/t/yacc-dry.sh
+++ b/t/yacc-dry.sh
@@ -26,6 +26,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 AM_YFLAGS = -d
 bin_PROGRAMS = foo
 foo_SOURCES = foo.c parse.y
diff --git a/t/yacc-grepping.sh b/t/yacc-grepping.sh
index b0cf91353..67381ba89 100644
--- a/t/yacc-grepping.sh
+++ b/t/yacc-grepping.sh
@@ -35,6 +35,8 @@ END
 $ACLOCAL
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zardoz
 zardoz_SOURCES = zardoz.y
 END
diff --git a/t/yacc-grepping2.sh b/t/yacc-grepping2.sh
index 159dd3e15..4af321fbe 100644
--- a/t/yacc-grepping2.sh
+++ b/t/yacc-grepping2.sh
@@ -25,6 +25,8 @@ AC_PROG_YACC
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = maude
 maude_SOURCES = sub/maude.y
 END
diff --git a/t/yacc-headers-and-dist-pr47.sh b/t/yacc-headers-and-dist-pr47.sh
index 57c8251ad..74ec525f9 100644
--- a/t/yacc-headers-and-dist-pr47.sh
+++ b/t/yacc-headers-and-dist-pr47.sh
@@ -30,6 +30,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = foo.y
 AM_YFLAGS = -d
diff --git a/t/yacc-line.sh b/t/yacc-line.sh
index e7a4d6244..2319c9791 100644
--- a/t/yacc-line.sh
+++ b/t/yacc-line.sh
@@ -32,6 +32,8 @@ END
 mkdir dir sub sub/dir
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 SUBDIRS = sub
 bin_PROGRAMS = foo bar
 AM_YFLAGS = -d
@@ -45,6 +47,8 @@ END
 
 cat > sub/Makefile.am << 'END'
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 noinst_PROGRAMS = foo bar
 foo_YFLAGS = -d
 foo_SOURCES = zardoz.y
diff --git a/t/yacc-misc.sh b/t/yacc-misc.sh
index 2bfb0c55e..fcc19aa49 100644
--- a/t/yacc-misc.sh
+++ b/t/yacc-misc.sh
@@ -26,6 +26,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = parse.y foo.c
 bar_SOURCES = bar.y foo.c
diff --git a/t/yacc-mix-c-cxx.sh b/t/yacc-mix-c-cxx.sh
index 7c44e0926..de05cdab8 100644
--- a/t/yacc-mix-c-cxx.sh
+++ b/t/yacc-mix-c-cxx.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = c1 c2 cxx1 cxx2 cxx3
 AM_YFLAGS = -d
 
diff --git a/t/yacc-nodist.sh b/t/yacc-nodist.sh
index dbb86bdb2..8e5338e94 100644
--- a/t/yacc-nodist.sh
+++ b/t/yacc-nodist.sh
@@ -31,6 +31,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 SUBDIRS = sub1 sub2
 .PHONY: test-build test-dist
 test-build: all
diff --git a/t/yacc-pr204.sh b/t/yacc-pr204.sh
index 91882e4d7..89acb1ee0 100644
--- a/t/yacc-pr204.sh
+++ b/t/yacc-pr204.sh
@@ -34,6 +34,8 @@ EOF
 # sure Automake match 'nodist_' against the right
 # variable name...
 cat > Makefile.am << 'EOF'
+AM_LFLAGS = --never-interactive
+
 AM_YFLAGS = -d
 EXTRA_PROGRAMS = foo
 PARSE2 = parse2.y
diff --git a/t/yacc-subdir.sh b/t/yacc-subdir.sh
index df31a3c51..d6c3f0cc8 100644
--- a/t/yacc-subdir.sh
+++ b/t/yacc-subdir.sh
@@ -28,6 +28,8 @@ END
 
 cat > Makefile.am << 'END'
 AUTOMAKE_OPTIONS = subdir-objects
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo/foo
 foo_foo_SOURCES = foo/parse.y
 AM_YFLAGS = -d
diff --git a/t/yacc-vpath.sh b/t/yacc-vpath.sh
index 52d2c45bd..42044ecf2 100644
--- a/t/yacc-vpath.sh
+++ b/t/yacc-vpath.sh
@@ -32,6 +32,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = parse.y foo.c
 END
diff --git a/t/yacc-weirdnames.sh b/t/yacc-weirdnames.sh
index 60f199d2d..8397bc636 100644
--- a/t/yacc-weirdnames.sh
+++ b/t/yacc-weirdnames.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am << 'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar foo2 bar2
 
 foo_SOURCES = parse.y.y
diff --git a/t/yflags-cmdline-override.sh b/t/yflags-cmdline-override.sh
index 37304645c..73982753a 100644
--- a/t/yflags-cmdline-override.sh
+++ b/t/yflags-cmdline-override.sh
@@ -27,6 +27,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = foo.y
 # A minor automake wart: automake doesn't generate code to clean
diff --git a/t/yflags-cxx.sh b/t/yflags-cxx.sh
index 9bd28b8ce..2596a95e3 100644
--- a/t/yflags-cxx.sh
+++ b/t/yflags-cxx.sh
@@ -39,6 +39,8 @@ END
 
 cat > Makefile.am <<'END'
 AUTOMAKE_OPTIONS = no-dependencies
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = main.cc foo.yy
 bar_SOURCES = main.cc bar.y++
diff --git a/t/yflags-d-false-positives.sh b/t/yflags-d-false-positives.sh
index 21efb2345..666dbe938 100644
--- a/t/yflags-d-false-positives.sh
+++ b/t/yflags-d-false-positives.sh
@@ -26,6 +26,8 @@ END
 $ACLOCAL
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = zardoz foobar
 zardoz_SOURCES = zardoz.y
 foobar_SOURCES = foobar.y
diff --git a/t/yflags-force-conditional.sh b/t/yflags-force-conditional.sh
index 3f9a13293..976b6f782 100644
--- a/t/yflags-force-conditional.sh
+++ b/t/yflags-force-conditional.sh
@@ -38,6 +38,8 @@ YACC=fake-yacc; export YACC
 
 cat > Makefile.am <<'END'
 AUTOMAKE_OPTIONS = no-dependencies
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = foo.y main.c
 bar_SOURCES = $(foo_SOURCES)
diff --git a/t/yflags-force-override.sh b/t/yflags-force-override.sh
index b1c36ef0f..7c865935b 100644
--- a/t/yflags-force-override.sh
+++ b/t/yflags-force-override.sh
@@ -28,6 +28,8 @@ AC_OUTPUT
 END
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo
 foo_SOURCES = foo.y
 # Don't do this in a real-life Makefile.am!
diff --git a/t/yflags-var-expand.sh b/t/yflags-var-expand.sh
index 0e06e0d9c..bf34922a6 100644
--- a/t/yflags-var-expand.sh
+++ b/t/yflags-var-expand.sh
@@ -29,6 +29,8 @@ END
 $ACLOCAL
 
 cat > Makefile.am <<'END'
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = foo.y
 bar_SOURCES = bar.y
diff --git a/t/yflags.sh b/t/yflags.sh
index 1f73776f8..2359a76b7 100644
--- a/t/yflags.sh
+++ b/t/yflags.sh
@@ -39,6 +39,8 @@ END
 
 cat > Makefile.am <<'END'
 AUTOMAKE_OPTIONS = no-dependencies
+AM_LFLAGS = --never-interactive
+
 bin_PROGRAMS = foo bar
 foo_SOURCES = main.c foo.y
 bar_SOURCES = main.c bar.y

compile finished at Mon Aug 28 18:31:34 2023

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Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.