GNU bug report logs - #55025
Automake should allow one to enable POSIX make behavior

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Package: automake; Severity: wishlist; Reported by: Vincent Lefevre <vincent@HIDDEN>; Keywords: confirmed; dated Tue, 19 Apr 2022 15:35:02 UTC; Maintainer for automake is bug-automake@HIDDEN.
Added tag(s) confirmed. Request was from Mike Frysinger <vapier@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Severity set to 'wishlist' from 'normal' Request was from Mike Frysinger <vapier@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at submit <at> debbugs.gnu.org:


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Date: Fri, 13 Jan 2023 01:19:39 -0500
From: Mike Frysinger <vapier@HIDDEN>
To: Vincent Lefevre <vincent@HIDDEN>, bug-automake@HIDDEN
Subject: Re: bug#55025: Automake should allow one to enable POSIX make behavior
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On 19 Apr 2022 17:33, Vincent Lefevre wrote:
> https://pubs.opengroup.org/onlinepubs/9699919799/utilities/make.html
> says about the target rules:
>=20
>   .POSIX
>     The application shall ensure that this special target is specified
>     without prerequisites or commands. If it appears as the first
>     non-comment line in the makefile, /make/ shall process the makefile
>     as specified by this section; otherwise, the behavior of /make/ is
>     unspecified.
>=20
> But even though one may add a .POSIX target as the first non-comment
> line in one's Makefile.am file, Automake will add various non-comment
> lines before this target in the generated Makefile. I received a
> remark about that for GNU MPFR. Though GNU make does not require
> this target to be the first non-comment line, this may matter with
> other make implementations.
>=20
> This could be done either by detecting a .POSIX target in Makefile.am
> or with some AM_* macro in the configure.ac file.

any reason we don't just define it ourselves unconditionally ?  seems
like the whole point of Automake is for devs to not worry about these
kind of nitty details.
-mike

--- a/lib/am/header-vars.am
+++ b/lib/am/header-vars.am
@@ -14,6 +14,8 @@
 ## You should have received a copy of the GNU General Public License
 ## along with this program.  If not, see <https://www.gnu.org/licenses/>.
=20
+.POSIX:
+
 VPATH =3D @srcdir@
=20
 @SET_MAKE@

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Information forwarded to bug-automake@HIDDEN:
bug#55025; Package automake. Full text available.

Message received at submit <at> debbugs.gnu.org:


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Date: Tue, 19 Apr 2022 17:33:48 +0200
From: Vincent Lefevre <vincent@HIDDEN>
To: bug-automake@HIDDEN
Subject: Automake should allow one to enable POSIX make behavior
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https://pubs.opengroup.org/onlinepubs/9699919799/utilities/make.html
says about the target rules:

  .POSIX
    The application shall ensure that this special target is specified
    without prerequisites or commands. If it appears as the first
    non-comment line in the makefile, /make/ shall process the makefile
    as specified by this section; otherwise, the behavior of /make/ is
    unspecified.

But even though one may add a .POSIX target as the first non-comment
line in one's Makefile.am file, Automake will add various non-comment
lines before this target in the generated Makefile. I received a
remark about that for GNU MPFR. Though GNU make does not require
this target to be the first non-comment line, this may matter with
other make implementations.

This could be done either by detecting a .POSIX target in Makefile.am
or with some AM_* macro in the configure.ac file.

-- 
Vincent Lefèvre <vincent@HIDDEN> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
Acknowledgement sent to Vincent Lefevre <vincent@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-automake@HIDDEN. Full text available.
Report forwarded to bug-automake@HIDDEN:
bug#55025; Package automake. Full text available.
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