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...Command: clang -S -o volatile-test.s -O3 test.c Output attached. The only line of interest is probably: jmp external # TAILCALL -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130604/fcb995e2/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: extern-test.s Type: application/octet-stream Size: 326 bytes Desc: not available URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130604/fcb995e2/attachment.obj>

On Jun 4, 2013, at 4:42 PM, Tyler Hardin <tghardin1 at catamount.wcu.edu> wrote: > I was suggesting to add it to the function, like > volatile void func(..); > Theoretically, this would tell the compiler not to omit seemingly superfluous calls to func. 'volatile' can't apply to a function, so I'm not sure what you mean. In your example, 'volatile' modifies