This improves the fairly uninformative "Operation not supported"
message given when std::thread is used without linking to libpthread.
Now you get:
terminate called after throwing an instance of 'std::system_error'
what(): Enable multithreading to use std::thread: Operation not permitted
Aborted
PR libstdc++/52681
* src/c++11/thread.cc (thread::_M_start_thread): Improve error text
when threads are not enabled.
Tested x86_64-linux, with exceptions enabled and disabled. Committed to trunk.
commit d79ac9a14880d5f20fd62c72d87c4f3405727350
Author: redi <redi@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Sun Aug 12 18:57:53 2012 +0000
PR libstdc++/52681
* src/c++11/thread.cc (thread::_M_start_thread): Improve error text
when threads are not enabled.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@190330
138bc75d-0d04-0410-961f-82ee72b054a4
diff --git a/libstdc++-v3/src/c++11/thread.cc b/libstdc++-v3/src/c++11/thread.cc
index ff034b1..5c10832 100644
--- a/libstdc++-v3/src/c++11/thread.cc
+++ b/libstdc++-v3/src/c++11/thread.cc
@@ -115,7 +115,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
thread::_M_start_thread(__shared_base_type __b)
{
if (!__gthread_active_p())
+#if __EXCEPTIONS
+ throw system_error(make_error_code(errc::operation_not_permitted),
+ "Enable multithreading to use std::thread");
+#else
__throw_system_error(int(errc::operation_not_permitted));
+#endif
__b->_M_this_ptr = __b;
int __e = __gthread_create(&_M_id._M_thread,
