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Fix --enable-warningflags

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gcc gives an error on an unknown warning flag, but clang just gives a
warning.  Upgrade the warning in clang to an error by activating
-Werror=unknown-warning-option if available.

Signed-off-by: Allan McRae <allan@archlinux.org>
This commit is contained in:
Allan McRae 2013-02-10 11:55:04 +10:00
parent 42b492b2fd
commit 05b0d7e799
1 changed files with 4 additions and 0 deletions
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4
m4/acinclude.m4
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@ -114,6 +114,10 @@ AC_DEFUN([CFLAGS_ADD],
[AS_VAR_PUSHDEF([my_cflags], [cflags_cv_warn_$1])dnl [AS_VAR_PUSHDEF([my_cflags], [cflags_cv_warn_$1])dnl
AC_CACHE_CHECK([whether compiler handles $1], [my_cflags], [ AC_CACHE_CHECK([whether compiler handles $1], [my_cflags], [
save_CFLAGS="$CFLAGS" save_CFLAGS="$CFLAGS"
CFLAGS="${CFLAGS} -Werror=unknown-warning-option"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
[],
[CFLAGS="$save_CFLAGS"])
CFLAGS="${CFLAGS} $1" CFLAGS="${CFLAGS} $1"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
[AS_VAR_SET([my_cflags], [yes])], [AS_VAR_SET([my_cflags], [yes])],