From 747bbdf79ffa7774c1343774e2202cf13105ad6f Mon Sep 17 00:00:00 2001 From: Blue Swirl Date: Sun, 18 Oct 2009 16:26:06 +0000 Subject: Suppress warnings about 'warn_unused_result' attribute directive Signed-off-by: Blue Swirl --- configure | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'configure') diff --git a/configure b/configure index ca6d45c..7775b1b 100755 --- a/configure +++ b/configure @@ -1667,6 +1667,23 @@ if compile_prog "" "" ; then fi ########################################## +# check if the compiler understands attribute warn_unused_result +# +# This could be smarter, but gcc -Werror does not error out even when warning +# about attribute warn_unused_result + +gcc_attribute_warn_unused_result=no +cat > $TMPC << EOF +#if defined(__GNUC__) && (__GNUC__ < 4) && defined(__GNUC_MINOR__) && (__GNUC__ < 4) +#error gcc 3.3 or older +#endif +int main(void) { return 0;} +EOF +if compile_prog "" ""; then + gcc_attribute_warn_unused_result=yes +fi + +########################################## # check if we have fdatasync fdatasync=no @@ -1994,6 +2011,9 @@ fi if test "$need_offsetof" = "yes" ; then echo "CONFIG_NEED_OFFSETOF=y" >> $config_host_mak fi +if test "$gcc_attribute_warn_unused_result" = "yes" ; then + echo "CONFIG_GCC_ATTRIBUTE_WARN_UNUSED_RESULT=y" >> $config_host_mak +fi if test "$fdatasync" = "yes" ; then echo "CONFIG_FDATASYNC=y" >> $config_host_mak fi -- cgit v1.1