C thread local storage support

[Martin Sustrik <sustrik@xxxxxxxxxx>]

Hi,

GCC documentation on thread-local variables says:

"It requires significant support from the linker (ld), dynamic linker 
(ld.so), and system libraries (libc.so and libpthread.so), so it is not 
available everywhere."

Is there any way to find out which platforms do support TLS and which do 
not?

Thanks.
Martin