The check for a broken GCC -Wlogical-op implemententation was written under the wrong assumption that unknown warning options would be gracefully ignored. Thanks to Eric Blake and Daniel Berrange for pointing that out. Signed-off-by: Viktor Mihajlovski <mihajlov(a)linux.vnet.ibm.com&gt; --- configure.ac | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/configure.ac b/configure.ac index 20caa92..828ae01 100644 --- a/configure.ac +++ b/configure.ac @@ -260,7 +260,13 @@ dnl which is the case with a certain range of GCC versions AC_MSG_CHECKING([whether GCC -Wlogical-op is broken]) save_CFLAGS="$CFLAGS" -CFLAGS="-O2 -Wlogical-op -Werror" +for w_opt in $WARN_CFLAGS; do + case $w_opt in + "-Wlogical-op" | "-Werror" ) + CFLAGS="$CFLAGS $w_opt" + ;; + esac +done AC_TRY_COMPILE([#include <string.h>], [const char *haystack; -- 1.7.9.5