From 12c8ae2541b654a09bd6a2f264856f6fc0089a23 Mon Sep 17 00:00:00 2001
From: Haru <haru@dotalux.com>
Date: Thu, 27 Aug 2015 01:26:14 +0200
Subject: Added an availability check for the -rdynamic linker option

- Fixes an issue preventing to compile on non-ELF systems (i.e. OS X)
  using recent gcc versions (such as 5.2) that are unable to filter out
  this option where it's not needed.
- Thanks to Smokexyz for reporting the issue.

Signed-off-by: Haru <haru@dotalux.com>
---
 configure.in | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

(limited to 'configure.in')

diff --git a/configure.in b/configure.in
index de709bede..5bb0dff65 100644
--- a/configure.in
+++ b/configure.in
@@ -487,8 +487,7 @@ AC_LANG([C])
 
 CFLAGS="$CFLAGS -pipe -ffast-math -fvisibility=hidden -Wall -Wextra -Wno-sign-compare"
 CPPFLAGS="$CPPFLAGS -I../common"
-LDFLAGS="$LDFLAGS -rdynamic"
-
+LDFLAGS="$LDFLAGS"
 
 AC_C_BIGENDIAN(
 	[AC_MSG_ERROR([[bigendian is not supported... stopping]])],
@@ -590,6 +589,32 @@ AC_RUN_IFELSE(
 	]
 )
 
+#
+# Check if the linker supports/accepts -rdynamic
+# Generally only needed by the ELF linker, in order to produce backtraces.
+# On non-ELF platforms, some compilers (i.e. gcc < 5 and clang on OSX) are able to ignore it, others will error out.
+#
+OLD_LDFLAGS="$LDFLAGS"
+LDFLAGS="$LDFLAGS -rdynamic"
+AC_MSG_CHECKING([whether $CC accepts -rdynamic])
+AC_LINK_IFELSE(
+	[AC_LANG_SOURCE([
+		int main(int argc, char **argv)
+		{
+			return 0;
+		}
+	])],
+	[
+		AC_MSG_RESULT([yes])
+	],
+	[
+		AC_MSG_RESULT([no])
+		LDFLAGS="$OLD_LDFLAGS"
+	],
+	[
+		AC_MSG_RESULT([guessing no])
+	]
+)
 
 #
 # LTO Support test
-- 
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