warnings: Use CPPFLAGS to really check whether the parameter works.

diff --git a/ChangeLog b/ChangeLog
index 0d3139c77043133617744f57d0667950504db486..61cd8fa63941faa84ceb49fd9eae6390ebaecc30 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-11-17  Simon Josefsson  <simon@josefsson.org>
+
+       * m4/warnings.m4: Use CPPFLAGS to really check whether the
+       parameter works.
+
 2008-11-17  Simon Josefsson  <simon@josefsson.org>
 
        * m4/warnings.m4: Add gl_WARN_COMPLEMENT and gl_WARN_SUPPORTED.

diff --git a/m4/warnings.m4 b/m4/warnings.m4
index f836793aba867ba19dae5bada9bc7b1c609ea00f..686d8c7e0712afddf7930dfd80c540dc0ecdc0f4 100644 (file)
--- a/m4/warnings.m4
+++ b/m4/warnings.m4
@@ -29,12 +29,12 @@ m4_ifdef([AS_VAR_APPEND],
 AC_DEFUN([gl_WARN_ADD],
 [AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_$1])dnl
 AC_CACHE_CHECK([whether compiler handles $1], [gl_Warn], [
-  save_CFLAGS="$CFLAGS"
-  CFLAGS="${CFLAGS} $1"
+  save_CPPFLAGS="$CPPFLAGS"
+  CPPFLAGS="${CPPFLAGS} $1"
   AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])],
                     [AS_VAR_SET([gl_Warn], [yes])],
                    [AS_VAR_SET([gl_Warn], [no])])
-  CFLAGS="$save_CFLAGS"
+  CPPFLAGS="$save_CPPFLAGS"
 ])
 AS_VAR_PUSHDEF([gl_Flags], m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]))dnl
 gl_AS_VAR_IF([gl_Warn], [yes], [gl_AS_VAR_APPEND([gl_Flags], [" $1"])])