GNU bug report logs - #67477
Automake warns that $(?D) is a non-POSIX variable name

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

From: Quinn Grier <quinn <at> quinngrier.com>
To: bug-automake <at> gnu.org
Subject: Automake warns that $(?D) is a non-POSIX variable name
Date: Sun, 26 Nov 2023 21:42:52 -0800

POSIX Make allows the syntax $(@D) and $(@F) to be used to retrieve the
directory and filename parts of the $@ internal macro. It also allows
this syntax for the other four internal macros ($%, $?, $<, and $*).

Automake seems to be aware of $(@D) and $(@F), but not the others.

Here is an example:

      $ nl configure.ac
           1  AC_INIT([example], [1])
           2  AM_INIT_AUTOMAKE([-Wall foreign])
           3  AC_CONFIG_FILES([Makefile])
           4  AC_OUTPUT

      $ nl Makefile.am
           1  foo.a(foo.o): foo.o
           2          echo $(@D) # no warning
           3          echo $(@F) # no warning
           4          echo $(%D) # warning
           5          echo $(%F) # warning
           6          echo $(?D) # warning
           7          echo $(?F) # warning
           8          echo $(<D) # warning
           9          echo $(<F) # warning
          10          echo $(*D) # warning
          11          echo $(*F) # warning

      $ autoreconf -i
      Makefile.am:4: warning: %D: non-POSIX variable name
      Makefile.am:5: warning: %F: non-POSIX variable name
      Makefile.am:6: warning: ?D: non-POSIX variable name
      Makefile.am:7: warning: ?F: non-POSIX variable name
      Makefile.am:8: warning: <D: non-POSIX variable name
      Makefile.am:9: warning: <F: non-POSIX variable name
      Makefile.am:10: warning: *D: non-POSIX variable name
      Makefile.am:11: warning: *F: non-POSIX variable name

      $ autoconf --version | head -n 1
      autoconf (GNU Autoconf) 2.71

      $ automake --version | head -n 1
      automake (GNU automake) 1.16.5

Message #8 received at 67477 <at> debbugs.gnu.org (full text, mbox):

From: Karl Berry <karl <at> freefriends.org>
To: quinn <at> quinngrier.com
Cc: 67477 <at> debbugs.gnu.org
Subject: Re: bug#67477: Automake warns that $(?D) is a non-POSIX variable name
Date: Mon, 27 Nov 2023 15:47:31 -0700

Hi Quinn,

> Automake seems to be aware of $(@D) and $(@F), but not the others.

Thanks for the report. This was fixed not long ago, and will be in the
next release. The prior report, for the record:
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=9587

All the best,
Karl

Message #16 received at 67477 <at> debbugs.gnu.org (full text, mbox):

From: Quinn Grier <quinn <at> quinngrier.com>
To: 67477 <at> debbugs.gnu.org
Subject: Re: Automake warns that $(?D) is a non-POSIX variable name
Date: Mon, 27 Nov 2023 14:42:05 -0800

Naturally, now that I've reported this bug after I couldn't find it
being already reported, I search again and find that it was already
reported a long time ago:
<https://debbugs.gnu.org/cgi/bugreport.cgi?bug=9587>.

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