- (tim) [aclocal.m4] Enhance OSSH_CHECK_CFLAG_COMPILE to check stderr.

feedback and ok dtucker

ChangeLog

@@ -16,6 +16,8 @@
    need a shell that can handle "[ file1 -nt file2 ]". Rather than keep
    dealing with shell portability issues in regression tests, we let
    configure find us a capable shell on those platforms with an old /bin/sh.
+ - (tim) [aclocal.m4] Enhance OSSH_CHECK_CFLAG_COMPILE to check stderr.
+   feedback and ok dtucker
 
 20130601
  - (dtucker) [configure.ac openbsd-compat/xcrypt.c] bz#2112: fall back to

aclocal.m4

@@ -1,4 +1,4 @@
-dnl $Id: aclocal.m4,v 1.8 2011/05/20 01:45:25 djm Exp $
+dnl $Id: aclocal.m4,v 1.9 2013/06/02 21:31:27 tim Exp $
 dnl
 dnl OpenSSH-specific autoconf macros
 dnl
@@ -14,8 +14,15 @@ AC_DEFUN([OSSH_CHECK_CFLAG_COMPILE], [{
 	_define_flag="$2"
 	test "x$_define_flag" = "x" && _define_flag="$1"
 	AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int main(void) { return 0; }]])],
-		[ AC_MSG_RESULT([yes])
-		  CFLAGS="$saved_CFLAGS $_define_flag"],
+		[
+if `grep -i "unrecognized option" conftest.err >/dev/null`
+then
+		AC_MSG_RESULT([no])
+		CFLAGS="$saved_CFLAGS"
+else
+		AC_MSG_RESULT([yes])
+		 CFLAGS="$saved_CFLAGS $_define_flag"
+fi],
 		[ AC_MSG_RESULT([no])
 		  CFLAGS="$saved_CFLAGS" ]
 	)