ATOMIC_OP_NEEDS_MEMORY_BARRIER on ARM

Bryce Harrington <[email protected]>
Newsgroups gmane.comp.lib.cairo
Message-ID <[email protected]> 
Hi Henry,

"ATOMIC_OP_NEEDS_MEMORY_BARRIER configure check shouldn't be false for ARM"
https://bugs.freedesktop.org/show_bug.cgi?id=90302

In this bug report it is suggested that for ARM, that
ATOMIC_OP_NEEDS_MEMORY_BARRIER should default to on for ARM, since ARM
has weaker memory ordering guarantees than x86.

What do you think?

Bryce
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