build: Enable gcc warnings to detect non-portable code.

--

Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit c52930d11fcc52515fcc09a1085bf118411566a8)

Gbp-Pq: Name 0016-build-Enable-gcc-warnings-to-detect-non-portable-cod.patch

diff --git a/configure.ac b/configure.ac
index 932c741efeaefa3746545e6767f0d15f37298150..237189cf9449c8e63bb4566c3afb271994e69693 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1575,6 +1575,15 @@ if test "$GCC" = yes; then
         if test x"$_gcc_wopt" = xyes ; then
           mycflags="$mycflags -Wdeclaration-after-statement"
         fi
+
+        AC_MSG_CHECKING([if gcc supports -Wlogical-op and -Wvla])
+        CFLAGS="-Wlogical-op -Wvla"
+        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],_gcc_wopt=yes,_gcc_wopt=no)
+        AC_MSG_RESULT($_gcc_wopt)
+        if test x"$_gcc_wopt" = xyes ; then
+          mycflags="$mycflags -Wlogical-op -Wvla"
+        fi
+
     else
         mycflags="$mycflags -Wall"
     fi