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authorLasse Collin <lasse.collin@tukaani.org>2014-09-25 18:38:48 +0300
committerLasse Collin <lasse.collin@tukaani.org>2014-09-25 18:38:48 +0300
commitc4911f2db36d811896c73c008b4218d8fa9a4730 (patch)
tree21c4e046aae50dc426c5fdbaebf11e84e021246c
parentUpdate NEWS for 5.0.7. (diff)
downloadxz-c4911f2db36d811896c73c008b4218d8fa9a4730.tar.xz
Build: Detect supported compiler warning flags better.
Clang and nowadays also GCC accept any -Wfoobar option but then may give a warning that an unknown warning option was specified. To avoid adding unsupported warning options, the options are now tested with -Werror. Thanks to Charles Diza.
Diffstat (limited to '')
-rw-r--r--configure.ac5
1 files changed, 3 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac
index 2df67970..e41979bb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -749,8 +749,9 @@ if test "$GCC" = yes ; then
do
AC_MSG_CHECKING([if $CC accepts $NEW_FLAG])
OLD_CFLAGS="$CFLAGS"
- CFLAGS="$CFLAGS $NEW_FLAG"
- AC_COMPILE_IFELSE([AC_LANG_SOURCE([void foo(void) { }])], [
+ CFLAGS="$CFLAGS $NEW_FLAG -Werror"
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE(
+ [void foo(void); void foo(void) { }])], [
AM_CFLAGS="$AM_CFLAGS $NEW_FLAG"
AC_MSG_RESULT([yes])
], [