GNU bug report logs - #65730
[PATCH v2] m4: Update invocation of AC_PROG_LEX

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Package: automake-patches; Reported by: Łukasz Stelmach <stlman@HIDDEN>; Keywords: patch; merged with #65600; dated Mon, 4 Sep 2023 11:48:02 UTC; Maintainer for automake-patches is automake-patches@HIDDEN.
Merged 65600 65730. Request was from Karl Berry <karl@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: [bug#65600] [PATCH] Allow parameters AM_PROG_LEX
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Karl Berry <karl@HIDDEN>, Tue Sep 05 2023 23:15:16 GMT+0200
(Central European Summer Time)
>      Karl: The same problem was also reported as bug 65730, with a patch
>
> Thanks Zack. I had just composed a reply saying just about exactly the
> same thing as you wrote :).
>
> I will merge the patches and try Bogdan's test, no problem. -k
>
> P.S. Bogdan, sorry that I wasn't thinking more clearly when I asked you
> to write the more complicated version.


  No problem, new "experience points" earned :). M4 and all Autoconf
macros (knowledge about their existence) are still a bit out of my
range. Especially AC_PROVIDE_IFELSE, which I don't even have in my
Autoconf manual (it *is* found in the code, but not in the manual)...

Bogdan
Information forwarded to automake-patches@HIDDEN:
bug#65730; Package automake-patches. Full text available.

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Subject: Re: [bug#65600] [PATCH] Allow parameters AM_PROG_LEX
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    Karl: The same problem was also reported as bug 65730, with a patch

Thanks Zack. I had just composed a reply saying just about exactly the
same thing as you wrote :).

I will merge the patches and try Bogdan's test, no problem. -k

P.S. Bogdan, sorry that I wasn't thinking more clearly when I asked you
to write the more complicated version.
Information forwarded to automake-patches@HIDDEN:
bug#65730; Package automake-patches. Full text available.

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Date: Tue, 05 Sep 2023 15:49:45 -0400
From: "Zack Weinberg" <zack@HIDDEN>
To: "Karl Berry" <karl@HIDDEN>
Subject: Re: [bug#65600] [PATCH] Allow parameters AM_PROG_LEX
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> Karl Berry <karl@HIDDEN>, Fri Sep 01 2023 00:28:04 GMT+0200
> (Central European Summer Time)
>> Bogdan: I will adjust the patch, one way or another. Nothing more for
>> you to do here after all :). --thanks, karl.

Karl: The same problem was also reported as bug 65730, with a patch
supplied by =C5=81ukasz Stelmach.  That patch is preferable to Bogdan's
patch, for two reasons.  First, =C5=81ukasz's patch uses $@ to forward *=
all*
arguments to AC_PROG_LEX, regardless of what they are, making it robust
to the possibility of *more* arguments being added to AC_PROG_LEX in the
future (for example, we might decide to add an option to specify that
you need Flex specifically).  Second, =C5=81ukasz's patch checks whether
AC_PROG_LEX has already been invoked, and if so does not run it again.
That makes the updated AM_PROG_LEX continue to be compatible with the
workaround we (Autoconf) have been suggesting for this issue, namely
to write

AC_PROG_LEX([noyywrap])
AM_PROG_LEX

It looks like Bogdan's patch does include a new set of tests that are
worth preserving, but please use =C5=81ukasz's actual code change.  (I r=
egret
I cannot volunteer to merge the two patches as I am in the middle of
reinstalling the operating system on my workstation, and that's already
taken a week and a half with no end in sight.  You know how these things
go, I'm sure.)

zw
Information forwarded to automake-patches@HIDDEN:
bug#65730; Package automake-patches. Full text available.

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Subject: [PATCH v2] m4: Update invocation of AC_PROG_LEX
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Commit 73f1be5e42e3 to autoconf has introduced an argument
to AC_PROG_LEX. Invocation without the argument has been treated
as obsolete since then.

* m4/lex.m4: pass the required argument to AC_PROG_LEX

* doc/automake.texi: Describe it.

* NEWS: Mention it
---
 NEWS              | 2 ++
 doc/automake.texi | 5 +++--
 m4/lex.m4         | 6 +++---
 3 files changed, 8 insertions(+), 5 deletions(-)

I sent v1[1] by mistake to autoconf-patches@HIDDEN where Zack Weinberg
sent[2] some suggestions.

[1] https://lists.gnu.org/archive/html/autoconf-patches/2023-08/msg00002.html
[2] https://lists.gnu.org/archive/html/autoconf-patches/2023-08/msg00003.html

diff --git a/NEWS b/NEWS
index ced0fd640..78162b746 100644
--- a/NEWS
+++ b/NEWS
@@ -57,6 +57,8 @@ New in 1.17:
 
   - tests: avoid some declaration conflicts for lex et al. on SunOS.
 
+  - Pass options AC_PROG_LEX requires
+
 * Obsolescent features:
 
   - py-compile no longer supports Python 0.x or 1.x versions.  Python 2.0,
diff --git a/doc/automake.texi b/doc/automake.texi
index d14b769fd..61b7fd095 100644
--- a/doc/automake.texi
+++ b/doc/automake.texi
@@ -4130,7 +4130,7 @@ Automake 1.14, the @code{AC_PROG_CC} is rewritten to implement such
 checks itself, and thus the explicit use of @code{AM_PROG_CC_C_O}
 should no longer be required.
 
-@item AM_PROG_LEX
+@item AM_PROG_LEX(@var{options})
 @acindex AM_PROG_LEX
 @acindex AC_PROG_LEX
 @cindex HP-UX 10, @command{lex} problems
@@ -4138,7 +4138,8 @@ should no longer be required.
 Like @code{AC_PROG_LEX} (@pxref{Particular Programs, , Particular
 Program Checks, autoconf, The Autoconf Manual}), but uses the
 @command{missing} script on systems that do not have @command{lex}.
-HP-UX 10 is one such system.
+HP-UX 10 is one such system. @var{options} are passed directly to
+@code{AC_PROG_LEX}.
 
 @item AM_PROG_GCJ
 @acindex AM_PROG_GCJ
diff --git a/m4/lex.m4 b/m4/lex.m4
index 7b0511526..e9a8485d6 100644
--- a/m4/lex.m4
+++ b/m4/lex.m4
@@ -6,14 +6,14 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# AM_PROG_LEX
-# -----------
+# AM_PROG_LEX(OPTIONS)
+# --------------------
 # Autoconf leaves LEX=: if lex or flex can't be found.  Change that to a
 # "missing" invocation, for better error output.
 AC_DEFUN([AM_PROG_LEX],
 [AC_PREREQ([2.50])dnl
 AC_REQUIRE([AM_MISSING_HAS_RUN])dnl
-AC_REQUIRE([AC_PROG_LEX])dnl
+AC_PROVIDE_IFELSE([AC_PROG_LEX], [], [AC_PROG_LEX($@)])dnl
 if test "$LEX" = :; then
   LEX=${am_missing_run}flex
 fi])
-- 
2.30.2
Acknowledgement sent to Łukasz Stelmach <stlman@HIDDEN>:
New bug report received and forwarded. Copy sent to automake-patches@HIDDEN. Full text available.
Report forwarded to automake-patches@HIDDEN:
bug#65730; Package automake-patches. Full text available.
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