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Re: autoconf-2.69c released [beta]

From: Gavin Smith
Subject: Re: autoconf-2.69c released [beta]
Date: Sat, 26 Sep 2020 13:15:17 +0100

On Fri, Sep 25, 2020 at 9:07 PM Gavin Smith <> wrote:
> > * Warnings about obsolete constructs are now on by default.
> >   They can be turned off with '-Wno-obsolete'.
> >
> I have tried building the git development version of Texinfo with
> the new autoconf, but am deluged with warnings.  I get the following
> warnings from autoconf:
> warning: The macro `AC_GNU_SOURCE' is obsolete.
> You should run autoupdate.
> ./lib/autoconf/specific.m4:312: AC_GNU_SOURCE is expanded from...
> gnulib/m4/gnulib-comp.m4:34: gl_EARLY is expanded from...
> the top level

I found it hard to track down where the AC_GNU_SOURCE use was coming
from, and the path "lib/autoconf/specific.m4" is incorrect for the
file "specific.m4". By searching for the text AC_GNU_SOURCE in all
project files as well as installed autoconf files, as well as looking
at the log files under autom4te.cache, I suspect it is coming from the
"extensions.m4" file from Gnulib. (I don't know why that file isn't
named in the error messages, though.) This has the following

# ------------------------
# Enable extensions on systems that normally disable them,
# typically due to standards-conformance issues.
  dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS.
  dnl gnulib does not need it. But if it gets required by third-party macros
  dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a
  dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS".
  dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE,
  dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck.


Would it be right to say that this should be changed in Gnulib,
otherwise any project using that file with Gnulib will have errors
from the new autoconf?

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