X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=m4%2Fattributes.m4;h=4b0fcdce3deb178b13fcc5b591b10a42fc2e419e;hb=5f7e5870f06e8ffa0603ae971de74e3f3f6344e5;hp=ac3c6624cde45ff8ecacd6a093390bc70570a6ee;hpb=3f85ef0f05ffc51e19f86fb83a1c51e8e3cd6817;p=elogind.git

diff --git a/m4/attributes.m4 b/m4/attributes.m4
index ac3c6624c..4b0fcdce3 100644
--- a/m4/attributes.m4
+++ b/m4/attributes.m4
@@ -34,14 +34,15 @@ dnl this special exception to the GPL to apply to your modified version as
 dnl well.
 
 dnl Check if FLAG in ENV-VAR is supported by compiler and append it
-dnl to WHERE-TO-APPEND variable
+dnl to WHERE-TO-APPEND variable. Note that we invert -Wno-* checks to
+dnl -W* as gcc cannot test for negated warnings.
 dnl CC_CHECK_FLAG_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG])
 
 AC_DEFUN([CC_CHECK_FLAG_APPEND], [
   AC_CACHE_CHECK([if $CC supports flag $3 in envvar $2],
                  AS_TR_SH([cc_cv_$2_$3]),
           [eval "AS_TR_SH([cc_save_$2])='${$2}'"
-           eval "AS_TR_SH([$2])='-Werror $3'"
+           eval "AS_TR_SH([$2])='-Werror `echo "$3" | sed 's/^-Wno-/-W/'`'"
            AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) { return 0; } ])],
                           [eval "AS_TR_SH([cc_cv_$2_$3])='yes'"],
                           [eval "AS_TR_SH([cc_cv_$2_$3])='no'"])
@@ -53,8 +54,8 @@ AC_DEFUN([CC_CHECK_FLAG_APPEND], [
 
 dnl CC_CHECK_FLAGS_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG1 FLAG2])
 AC_DEFUN([CC_CHECK_FLAGS_APPEND], [
-  for flag in $3; do
-    CC_CHECK_FLAG_APPEND($1, $2, $flag)
+  for flag in [$3]; do
+    CC_CHECK_FLAG_APPEND([$1], [$2], $flag)
   done
 ])