configure: Make GNUC visibility attribute test more reliable.

Using "int main (int argc, char** argv)" in this test causes GCC to
issue two warnings about unused variable if CFLAGS envvar has
-Wunused-parameter (or just -Wextra). Those warnings are not related
to the attribute checking but they can make the test fail anyway.

diff --git a/configure.ac b/configure.ac
index f8ef232b0c12bbc3b3461e3ac68aba5cc161566f..4dc75658a494f8f045c1aae76f58b42669ee67d6 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -847,7 +847,7 @@ __attribute__ ((visibility ("default")))
      f_default (void)
 {
 }
-int main (int argc, char **argv)
+int main (void)
 {
        f_hidden();
        f_internal();