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Emacs build fails on Windows mingw64

From: Andy Moreton
Subject: Emacs build fails on Windows mingw64
Date: Sat, 23 Oct 2021 21:42:49 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.60 (windows-nt)


Arash Esbati reported on the emacs developer list that the build is
failing on Windows 10 with the MSYS2 toolchain:


I can reproduce this problem on the emacs-28 and master branches of emacs.
The issue is with this hunk from gnulib string.in.h L456 (which matches
the gnulib master branch):

  # if __GNUC__ >= 11 && !defined strdup
  /* For -Wmismatched-dealloc: Associate strdup with free or rpl_free.  */
  _GL_FUNCDECL_SYS (strdup, char *,
                    (char const *__s)
                    _GL_ARG_NONNULL ((1))
  # endif

_GL_ATTRIBUTE_MALLOC is not defined when this code is reached. This has
only appeared since a recent upgrade to gcc 11.2 in MSYS (previously my
machine had gcc 10.3).

Can this issue be addressed in gnulib so the emacs bug can be fixed ?



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