Fix hidden visibility compiler test

Warnings from configure tests aren't usually checked.  gcc's
"visibility attribute not supported in this configuration" warning is
enabled by default so we don't need to add any warning flag except
-Werror.

	* configure.ac (bfd_cv_hidden): Run test with -Werror in CFLAGS.
	* configure: Regenerate.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index f086ad5..88a64d6 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,8 @@
+2018-05-25  Alan Modra  <amodra@gmail.com>
+
+       * configure.ac (bfd_cv_hidden): Run test with -Werror in CFLAGS.
+       * configure: Regenerate.
+
 2018-05-23  H.J. Lu  <hongjiu.lu@intel.com>
 
        * elf64-ppc.c (ppc64_elf_write_core_note): Add ATTRIBUTE_NONSTRING

diff --git a/bfd/configure b/bfd/configure
index 2f3dbe7..c5b6335 100755 (executable)
--- a/bfd/configure
+++ b/bfd/configure
@@ -14043,6 +14043,8 @@ fi
 
 
 
+save_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Werror"
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking compiler support for hidden visibility" >&5
 $as_echo_n "checking compiler support for hidden visibility... " >&6; }
 if test "${bfd_cv_hidden+set}" = set; then :
@@ -14070,6 +14072,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $bfd_cv_hidden" >&5
 $as_echo "$bfd_cv_hidden" >&6; }
+CFLAGS="$save_CFLAGS"
 if test $bfd_cv_hidden = yes; then
 
 $as_echo "#define HAVE_HIDDEN 1" >>confdefs.h

diff --git a/bfd/configure.ac b/bfd/configure.ac
index b320828..bb5c168 100644 (file)
--- a/bfd/configure.ac
+++ b/bfd/configure.ac
@@ -256,12 +256,15 @@ AC_CHECK_DECLS(strnlen)
 # This is used only by compress.c.
 AM_ZLIB
 
+save_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Werror"
 AC_CACHE_CHECK([compiler support for hidden visibility], bfd_cv_hidden,
 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 const char hw[] __attribute__ ((__visibility__ ("hidden"))) = "Hello, World\n";
 extern void print (const char *) __attribute__ ((__visibility__ ("hidden")));]],
        [[print (hw);]])],
   [bfd_cv_hidden=yes], [bfd_cv_hidden=no])])
+CFLAGS="$save_CFLAGS"
 if test $bfd_cv_hidden = yes; then
   AC_DEFINE(HAVE_HIDDEN, 1,
            [Define if your compiler supports hidden visibility.])