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Merge pull request #15885 from opensourcerouting/gcc-unrecognized-ms-anon-tag

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build: get rid of "unrecognized … anon-tag"
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Donald Sharp 2024-05-07 16:00:53 -04:00 committed by GitHub
parent 8756deffbf b4eb7a0374
commit 190f8baa7b
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1 changed files with 10 additions and 1 deletions
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11
configure.ac
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@ -275,7 +275,16 @@ AC_DEFUN([AC_C_FLAG], [{
AC_CACHE_CHECK([[whether $CC supports $1]], cachename, [
AC_LANG_PUSH([C])
ac_c_flag_save="$CFLAGS"
CFLAGS="$CFLAGS $1"
dnl GCC ignores unknown -Wno-whatever flags, but errors on -Wwhatever
dnl except when it ignores them it prints:
dnl cc1: note: unrecognized command-line option ‘-Wno-whatever’ may have been intended to silence earlier diagnostics
dnl which is annoying as hell. So check for the positive flag instead.
flag_add="$1"
if test "$flag_add" != "${flag_add#-Wno-}"; then
CFLAGS="$CFLAGS -W${flag_add#-Wno-}"
else
CFLAGS="$CFLAGS $flag_add"
fi
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[$4]])],
[