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-rw-r--r--m4/threads.m461
1 files changed, 61 insertions, 0 deletions
diff --git a/m4/threads.m4 b/m4/threads.m4
new file mode 100644
index 0000000..ea547c0
--- /dev/null
+++ b/m4/threads.m4
@@ -0,0 +1,61 @@
+dnl file : m4/threads.m4
+dnl author : Boris Kolpackov <boris@codesynthesis.com>
+dnl copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+dnl license : GNU GPL v2; see accompanying LICENSE file
+dnl
+AC_DEFUN([THREADS],[
+
+threads_thread_keyword=no
+
+AC_ARG_ENABLE(
+ [threads],
+ AS_HELP_STRING([--disable-threads], [disable threads (enabled by default)]),
+ [AS_IF([test x"$enableval" = xno], [threads=none], [threads=check])],
+ [threads=check])
+
+# If thread support is not disabled by the user, figure out what we can use.
+#
+if test x$threads = xcheck; then
+ case $host_os in
+ windows* | mingw*)
+ case $host_os in
+ mingw*)
+ CXXFLAGS="$CXXFLAGS -mthreads"
+ ;;
+ esac
+ threads=win32
+ ;;
+ *)
+ ACX_PTHREAD
+
+ if test x$acx_pthread_ok = xyes; then
+ threads=posix
+ LIBS="$LIBS $PTHREAD_LIBS"
+ CXXFLAGS="$CXXFLAGS $PTHREAD_CXXFLAGS"
+
+ # Check if we can use the __thread keyword.
+ #
+ AC_MSG_CHECKING([for __thread keyword])
+
+ CXX_LIBTOOL_LINK_IFELSE(
+ AC_LANG_SOURCE([[
+ __thread int tls_var;
+
+ int
+ main ()
+ {
+ tls_var = 0;
+ }
+ ]]),
+ [threads_thread_keyword=yes])
+
+ AC_MSG_RESULT([$threads_thread_keyword])
+ fi
+ ;;
+ esac
+fi
+
+if test x$threads = xcheck; then
+ AC_MSG_ERROR([thread support not available; use --disable-threads to force single-threaded mode])
+fi
+])dnl