From af2808859e7a98666785752b8069c473dda94a1f Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 15 Jun 2012 11:16:44 +0200
Subject: Add support for building against libmysqlclient that lacks
 THR_KEY_mysys

In certain distributions (specifically Fedora 15 and later), maintainers
limit the number of visible symbols. If THR_KEY_mysys is hidden, then we
try to create the TLS keys in such an order that it results in the correct
behavior. And then hope for the best.
---
 m4/libmysqlclient.m4 | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'm4/libmysqlclient.m4')

diff --git a/m4/libmysqlclient.m4 b/m4/libmysqlclient.m4
index e08a08e..84b4471 100644
--- a/m4/libmysqlclient.m4
+++ b/m4/libmysqlclient.m4
@@ -82,4 +82,26 @@ else
   AC_MSG_RESULT([no])
   $3
 fi
+
+# Check if the THR_KEY_mysys pthread key symbol is visible.
+#
+libmysqlclient_thr_key_visible=no
+
+if test x"$libmysqlclient_found" = xyes -a x"$1" = xposix; then
+
+CXX_LIBTOOL_LINK_IFELSE(
+AC_LANG_SOURCE([[
+#include <pthread.h>
+extern pthread_key_t THR_KEY_mysys;
+int
+main ()
+{
+  return pthread_getspecific (THR_KEY_mysys) != 0;
+}
+]]),
+[
+libmysqlclient_thr_key_visible=yes
+])
+fi
+
 ])dnl
-- 
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