GNU bug report logs - #54020
support compile-specific flags

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Package: automake; Reported by: Damian Szuberski <szuberskidamian@HIDDEN>; Keywords: confirmed help; dated Wed, 16 Feb 2022 01:42:02 UTC; Maintainer for automake is bug-automake@HIDDEN.
Added tag(s) confirmed and help. Request was from Mike Frysinger <vapier@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Changed bug title to 'support compile-specific flags' from 'Impossible to pass `-no-suppress` to `libtool` via automake files' Request was from Mike Frysinger <vapier@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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To: Karl Berry <karl@HIDDEN>, szuberskidamian@HIDDEN,
 54020 <at> debbugs.gnu.org
Subject: Re: bug#54020: Impossible to pass `-no-suppress` to `libtool` via
 automake files
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On 23 Feb 2022 01:12, Mike Frysinger wrote:
> my inclination is to introduce two new variables that would be used for libtool
> & non-libtool, and only when compiling.
> * xxx_COMPILE: to provide parity with existing xxx_LINK setting -- override
>   the compiler on a per-program basis
> * xxx_COMPILEFLAGS: appended only to compile calls so it can override all the
>   variables that are shared with other commands

having glanced through the implementation a bit, i don't know that i'll try
to implement this myself, at least any time soon.  this is heavily in the
perl side of things, and i'm not really versed in it.
-mike

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Information forwarded to bug-automake@HIDDEN:
bug#54020; Package automake. Full text available.

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From: Mike Frysinger <vapier@HIDDEN>
To: Karl Berry <karl@HIDDEN>
Subject: Re: bug#54020: Impossible to pass `-no-suppress` to `libtool` via
 automake files
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On 17 Feb 2022 16:33, Karl Berry wrote:
> Hi Damian - thanks for the report.
>=20
>     LTCOMPILE =3D $(LIBTOOL) $(AM_V_lt) --tag=3DCC $(AM_LIBTOOLFLAGS) \
>             $(LIBTOOLFLAGS) --mode=3Dcompile $(CC) $(DEFS) \
>             $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
>             $(AM_CFLAGS) $(CFLAGS)
>     ...
>     `libtool` has a command line option, `-no-suppress` ...
>=20
> Well, the immediate answer would apparently be to add yet another
> variable after the --mode=3Dcompile, say LTMODEOPTS for the sake of
> argument (have to think about the name), so the output is
>=20
> LTCOMPILE =3D $(LIBTOOL) $(AM_V_lt) --tag=3DCC $(AM_LIBTOOLFLAGS) \
>         $(LIBTOOLFLAGS) --mode=3Dcompile $(LTMODEOPTS) $(CC) ...

to clarify, Damian isn't saying it has to be between --mode=3Dcompile & $(C=
C).
in fact, pretty sure this doesn't work as libtool expects the argv to be the
arguments right after --mode=3Dcompile.

$ libtool --tag=3DCC --mode=3Dcompile -no-suppress gcc test.c -c -o test.o
Usage: /usr/bin/libtool [OPTION]... [MODE-ARG]...
Try 'libtool --help' for more information.
libtool:   error: unrecognised option: '-no-suppress'

the right command line is:
$ libtool --tag=3DCC --mode=3Dcompile gcc test.c -c -o test.o -no-suppress

so i think we can reframe the request as: Automake offers no way of specify=
ing
flags that are only used at compile time.  breaking down LTCOMPILE (for C):
* $(LIBTOOL) $(AM_V_lt) --tag=3DCC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mod=
e=3Dcompile:
  doesn't help as comes before $(CC) and we need flags to be after
* $(CC): used for preprocessing & compiling, and linking, and default for
  linking via `CCLD =3D $(CC)`
* $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS): used =
for
  preprocessing (dep generation, etc...) and compiling
* $(AM_CFLAGS) $(CFLAGS): used for preprocessing, compiling, and linking

if we look at the linking phase specifically, it's possible to put libtool
flags into xxx_LDFLAGS.  this is good, and what we already document+recomme=
nd.

my inclination is to introduce two new variables that would be used for lib=
tool
& non-libtool, and only when compiling.
* xxx_COMPILE: to provide parity with existing xxx_LINK setting -- override
  the compiler on a per-program basis
* xxx_COMPILEFLAGS: appended only to compile calls so it can override all t=
he
  variables that are shared with other commands

my only gripe is the lack of parity between other stages from a naming pov,
but i think we just have to swallow this pill.  most flags are based on the
language selection rather than the phase (e.g. CFLAGS is for C language and
is used for preprocessing, compiling, and linking C code).  LDFLAGS is only
for linking -- it's language independent.  if we added xxx_LINKFLAGS, it
would serve the same exact purpose as xxx_LDFLAGS, so doesn't add a whole
lot of value.
-mike

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Subject: Re: bug#54020: Impossible to pass `-no-suppress` to `libtool` via
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Hi Damian - thanks for the report.

    LTCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
            $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) \
            $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
            $(AM_CFLAGS) $(CFLAGS)
    ...
    `libtool` has a command line option, `-no-suppress` ...

Well, the immediate answer would apparently be to add yet another
variable after the --mode=compile, say LTMODEOPTS for the sake of
argument (have to think about the name), so the output is

LTCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
        $(LIBTOOLFLAGS) --mode=compile $(LTMODEOPTS) $(CC) ...

Mike, Jim, wdyt? --thanks, karl.
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Subject: Impossible to pass `-no-suppress` to `libtool` via automake files
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--00000000000006419505d815b30c
Content-Type: text/plain; charset="UTF-8"

Dear automake developers!

A standard `libtool` invocation line generated by automake looks like:
```
LTCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
        $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) \
        $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
        $(AM_CFLAGS) $(CFLAGS)
```
Sometimes files compiled using the method above make the compiler emit
errors. Those errors are suppressed by default which makes troubleshooting
impossible. `libtool` has a command line option, `-no-suppress` which can
be used to make the compiler verbose. Unfortunately, there is no way to
inject that option since `libtool` demands that it comes after
`--mode=compile`. `AM_LIBTOOLFLAGS` nor `LIBTOOLFLAGS` cannot be used for
that purpose since "it is too early", according to `libtool`'s command line
parser. It is somewhat possible to use `AM_CFLAGS` for that purpose but
then it breaks modes other than `--mode=compile`.

Is there any way to make libtool more verbose?
Thanks in advance!

Software used:
```
autoconf (GNU Autoconf) 2.71
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+/Autoconf: GNU GPL version 3 or later
<https://gnu.org/licenses/gpl.html>, <
https://gnu.org/licenses/exceptions.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by David J. MacKenzie and Akim Demaille.
automake (GNU automake) 1.16.5
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv2+: GNU GPL version 2 or later <
https://gnu.org/licenses/gpl-2.0.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Tom Tromey <tromey@HIDDEN>
       and Alexandre Duret-Lutz <adl@HIDDEN>.
```

-- 
Damian Szuberski

--00000000000006419505d815b30c
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Dear automake developers!<div><br></div><div>A standard `l=
ibtool` invocation line generated by automake looks like:</div><div>```</di=
v><div>LTCOMPILE =3D $(LIBTOOL) $(AM_V_lt) --tag=3DCC $(AM_LIBTOOLFLAGS) \<=
br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 $(LIBTOOLFLAGS) --mode=3Dcompile $(CC) $(DEF=
S) \<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CP=
PFLAGS) $(CPPFLAGS) \<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 $(AM_CFLAGS) $(CFLAGS)=
<br></div><div>```</div><div>Sometimes files compiled using the method abov=
e make the compiler emit errors. Those errors are suppressed by default whi=
ch makes troubleshooting impossible. `libtool` has a command line option, `=
-no-suppress` which can be used to make the compiler verbose. Unfortunately=
, there is no way to inject that option since `libtool` demands that it com=
es after `--mode=3Dcompile`. `AM_LIBTOOLFLAGS` nor `LIBTOOLFLAGS` cannot be=
 used for that purpose since &quot;it is too early&quot;, according to `lib=
tool`&#39;s command line parser. It is somewhat possible to use `AM_CFLAGS`=
 for that purpose but then it breaks modes other than `--mode=3Dcompile`.</=
div><div><br></div><div>Is there any way to make libtool more verbose?</div=
><div>Thanks in advance!</div><div><br></div><div>Software used:</div><div>=
```</div><div>autoconf (GNU Autoconf) 2.71<br>Copyright (C) 2021 Free Softw=
are Foundation, Inc.<br>License GPLv3+/Autoconf: GNU GPL version 3 or later=
<br>&lt;<a href=3D"https://gnu.org/licenses/gpl.html">https://gnu.org/licen=
ses/gpl.html</a>&gt;, &lt;<a href=3D"https://gnu.org/licenses/exceptions.ht=
ml">https://gnu.org/licenses/exceptions.html</a>&gt;<br>This is free softwa=
re: you are free to change and redistribute it.<br>There is NO WARRANTY, to=
 the extent permitted by law.<br><br>Written by David J. MacKenzie and Akim=
 Demaille.<br>automake (GNU automake) 1.16.5<br>Copyright (C) 2021 Free Sof=
tware Foundation, Inc.<br>License GPLv2+: GNU GPL version 2 or later &lt;<a=
 href=3D"https://gnu.org/licenses/gpl-2.0.html">https://gnu.org/licenses/gp=
l-2.0.html</a>&gt;<br>This is free software: you are free to change and red=
istribute it.<br>There is NO WARRANTY, to the extent permitted by law.<br><=
br>Written by Tom Tromey &lt;<a href=3D"mailto:tromey@HIDDEN">tromey@re=
dhat.com</a>&gt;<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0and Alexandre Duret-Lutz &lt=
;<a href=3D"mailto:adl@HIDDEN">adl@HIDDEN</a>&gt;.<br><div>```</div><div>=
<br></div>-- <br><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=
=3D"gmail_signature">Damian Szuberski</div></div></div>

--00000000000006419505d815b30c--
Acknowledgement sent to Damian Szuberski <szuberskidamian@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-automake@HIDDEN. Full text available.
Report forwarded to bug-automake@HIDDEN:
bug#54020; Package automake. Full text available.
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