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Port better to GNUstep with Nix gcc

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Problem reported by David Caldwell (bug#79879).
* configure.ac: When configuring for GNUstep and the
Objective C compiler does not support even C99 features,
use the first flag of -std=gnu23, -std=gnu17, -std=gnu11, -std=gnu99
that works, instead of insisting on -std=c99 which (a) is too
strict and (b) can override another -std= option in an
undesirable way.
This commit is contained in:
Paul Eggert 2025-11-27 23:33:36 -08:00
parent a1ab5f429d
commit 85f2bf2bc7
1 changed files with 17 additions and 9 deletions
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26
configure.ac
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@ -2957,16 +2957,24 @@ if test "${HAVE_NS}" = yes; then
fi
AC_CACHE_CHECK(
[if the Objective C compiler defaults to C99],
[emacs_cv_objc_c99],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([], [[for (int i = 0;;);]])],
[emacs_cv_objc_c99=yes],
[emacs_cv_objc_c99=no])])
[for C99-or-better flag for Objective C compiler],
[emacs_cv_objc_c99_or_better],
[save_OBJCFLAGS=$OBJCFLAGS
for emacs_cv_objc_c99_or_better in \
'none needed' -std=gnu23 -std=gnu17 -std=gnu11 -std=gnu99 ''
do
AS_CASE([$emacs_cv_objc_c99_or_better],
['none needed'], [],
[-*], [OBJCFLAGS="$save_OBJCFLAGS $emacs_cv_objc_c99_or_better"],
[continue])
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([], [[for (int i = 0;;);]])],
[break])
done
OBJCFLAGS=$save_OBJCFLAGS])
AS_CASE([$emacs_cv_objc_c99_or_better],
[-*], [GNU_OBJC_CFLAGS="$GNU_OBJC_CFLAGS $emacs_cv_objc_c99_or_better"])
if test x$emacs_cv_objc_c99 = xno ; then
GNU_OBJC_CFLAGS="$GNU_OBJC_CFLAGS -std=c99"
fi
AC_LANG_POP([Objective C])
fi