From b6fff39114fee90b806ed2e29cc8f5d9728d85a8 Mon Sep 17 00:00:00 2001
From: Ian Lynagh <igloo@earth.li>
Date: Tue, 23 Nov 2010 17:05:41 +0000
Subject: Add a configure test for the visibility hidden attribute

---
 aclocal.m4 | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'aclocal.m4')

diff --git a/aclocal.m4 b/aclocal.m4
index c50d3481da..288fd83208 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -35,6 +35,24 @@ AC_DEFUN([FPTOOLS_SET_C_LD_FLAGS],
 ])
 
 
+# FP_VISIBILITY_HIDDEN
+# ----------------------------------
+# Is the visibility hidden attribute supported?
+AC_DEFUN([FP_VISIBILITY_HIDDEN],
+[
+    AC_MSG_CHECKING([whether __attribute__((visibility("hidden"))) is supported])
+    echo '__attribute__((visibility("hidden"))) void foo(void) {}' > conftest.c
+    if $CC -Wall -Werror -c conftest.c > /dev/null 2>&1
+    then
+        AC_MSG_RESULT([yes])
+        AC_DEFINE(HAS_VISIBILITY_HIDDEN, 1, [Has visibility hidden])
+    else
+        AC_MSG_RESULT([no])
+    fi
+    rm -f conftest.c conftest.o
+])
+
+
 # FPTOOLS_FLOAT_WORD_ORDER_BIGENDIAN
 # ----------------------------------
 # Little endian Arm on Linux with some ABIs has big endian word order
-- 
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