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gh-96398: Detect GCC compatible compilers in configure (#117825)

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Introduce a cached variable $ac_cv_gcc_compat and set it to 'yes' if
the C preprocessor defines the __GNUC__ macro.
This commit is contained in:
Erlend E. Aasland 2024-04-13 09:05:07 +02:00 committed by GitHub
parent eca53620e3
commit c2a551a30b
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2 changed files with 40 additions and 1 deletions
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29
configure generated vendored
View File

@ -6317,6 +6317,34 @@ fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for GCC compatible compiler" >&5
printf %s "checking for GCC compatible compiler... " >&6; }
if test ${ac_cv_gcc_compat+y}
then :
printf %s "(cached) " >&6
else $as_nop
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#if !defined(__GNUC__)
#error "not GCC compatible"
#else
/* GCC compatible! */
#endif
_ACEOF
if ac_fn_c_try_cpp "$LINENO"
then :
ac_cv_gcc_compat=yes
else $as_nop
ac_cv_gcc_compat=no
fi
rm -f conftest.err conftest.i conftest.$ac_ext
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_gcc_compat" >&5
printf "%s\n" "$ac_cv_gcc_compat" >&6; }
preset_cxx="$CXX"
if test -z "$CXX"
@ -11579,7 +11607,6 @@ printf "%s\n" "#define size_t unsigned int" >>confdefs.h
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for uid_t in sys/types.h" >&5
printf %s "checking for uid_t in sys/types.h... " >&6; }
if test ${ac_cv_type_uid_t+y}

12
configure.ac
View File

@ -1025,6 +1025,18 @@ rm -f conftest.c conftest.out
# _POSIX_SOURCE, _POSIX_1_SOURCE, and more
AC_USE_SYSTEM_EXTENSIONS
AC_CACHE_CHECK([for GCC compatible compiler],
[ac_cv_gcc_compat],
[AC_PREPROC_IFELSE([AC_LANG_SOURCE([
#if !defined(__GNUC__)
#error "not GCC compatible"
#else
/* GCC compatible! */
#endif
], [])],
[ac_cv_gcc_compat=yes],
[ac_cv_gcc_compat=no])])
AC_SUBST([CXX])
preset_cxx="$CXX"