From 2c5b164288712cc048048d73a3cd841d845a132c Mon Sep 17 00:00:00 2001
From: Martin Bektchiev <martin.bektchiev@progress.com>
Date: Wed, 19 Dec 2018 18:33:08 +0200
Subject: [PATCH] fix(configure): Correctly detect visibility("hidden") support
 on Darwin

---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 27676b0bf..055fe183c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -270,7 +270,7 @@ if test "x$GCC" = "xyes"; then
   	echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1  ; }' > conftest.c
   	libffi_cv_hidden_visibility_attribute=no
   	if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
-  	    if grep '\.hidden.*foo' conftest.s >/dev/null; then
+  	    if egrep '(\.hidden|\.private_extern).*foo' conftest.s >/dev/null; then
   		libffi_cv_hidden_visibility_attribute=yes
   	    fi
   	fi