From 0b983110372926a6ee96ef97fb5779aa4a6d12fa Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 11 Feb 2013 10:15:34 +0200
Subject: Detect POSIX threads on MinGW-W64
---
m4/threads.m4 | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/m4/threads.m4 b/m4/threads.m4
index 9a7da53..1609a04 100644
--- a/m4/threads.m4
+++ b/m4/threads.m4
@@ -22,7 +22,16 @@ if test x$threads = xcheck; then
CXXFLAGS="$CXXFLAGS -mthreads"
;;
esac
- threads=win32
+
+ # Newer versions of GCC can be configured to use either Win32 or POSIX
+ # threads. It appears that -mthreads should be used in both cases but
+ # if the model is POSIX then GCC will also link -lpthread by default.
+ # Use that fact to test which model we have.
+ #
+ AC_TRY_LINK([#include <pthread.h>],
+ [pthread_create(0,0,0,0);],
+ [threads=posix],
+ [threads=win32])
;;
*)
ACX_PTHREAD
--
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