Optimization of conditional access to globals: thread-unsafe?

[Eric Botcazou]

> But shouldn't we formally define "define" first? :)

Note that I wrote "more or less formally".  The definition of "volatile" in 
the ISO C standard falls into this category and I'd personally trust it more 
than whatever -fno-speculative-store option.

See gcc/gthr-posix.h for a proper use of "volatile" for a shared access.

-- 
Eric Botcazou