On Fri, Sep 25, 2020 at 9:07 PM Gavin Smith <gavinsmith0123@xxxxxxxxx> 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: > > configure.ac:87: warning: The macro `AC_GNU_SOURCE' is obsolete. > configure.ac:87: 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... > configure.ac:87: 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 definition: # gl_USE_SYSTEM_EXTENSIONS # ------------------------ # Enable extensions on systems that normally disable them, # typically due to standards-conformance issues. AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS], [ 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. AC_REQUIRE([AC_GNU_SOURCE]) AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) ]) 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?
