build-sys: fix UL_SCANF_TYPE_MODIFIER for icc

icc needs -Werror to let %m fail and to avoid this:
../libmount/src/tab_parse.c(61): warning #269: invalid format string conversion

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>

diff --git a/configure.ac b/configure.ac
index de299d3412d3d78934e9471c83bbdd2516bdfa5d..a0d57631a3af10ee0f60633b65947884e44d1be0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -492,6 +492,8 @@ int main()
        return 1;
 }])
 
+ul_save_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="-Werror ${CPPFLAGS}"
 AC_CACHE_VAL([scanf_cv_alloc_modifier],
   AC_RUN_IFELSE([AC_LANG_SOURCE([UL_SCANF_TYPE_MODIFIER(["%ms"])])],
     [scanf_cv_alloc_modifier=ms],
@@ -525,6 +527,7 @@ AC_CACHE_VAL([scanf_cv_alloc_modifier],
     [scanf_cv_alloc_modifier=no])]
   )
 )
+CPPFLAGS="$ul_save_CPPFLAGS"
 
 AC_MSG_CHECKING([scanf string alloc modifiers])
 AS_CASE([$scanf_cv_alloc_modifier],