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[v3] improve exception text when threads not enabled

From: Jonathan Wakely <jwakely dot gcc at gmail dot com>
To: "libstdc++" <libstdc++ at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Sun, 12 Aug 2012 20:02:30 +0100
Subject: [v3] improve exception text when threads not enabled

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.

Attachment: patch.txt
Description: Text document

Follow-Ups:
- Re: [v3] improve exception text when threads not enabled
  - From: Joe Buck

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