What is the current state of support for 'thread_local' across platforms?

I'd like a summary of what the current state of support for the 'thread_local' keyword is across different compilers and platforms.

I'm specifically interested in common desktop and mobile platforms. The information I could find seems spotty at best with reports of it working on some platforms and not on others or mentions of support being a WIP. Answers that confirm support (or lack of support) even for single platforms are welcome. Please mention any caveats to the support if there are any.

• Windows (gcc, clang, msvc)


• Linux (gcc, clang)


• OS X (gcc, clang)


• Android (gcc, clang)


• iOS


• BlackBerry


• Windows Phone/RT/etc