Example: write a function without side effects except writing to a local array whose address is returned. The entire function disappears.
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@marcan42 compile with -fno-whole-program ?
@twoscomplement I'm compiling only, not linking, and that doesn't change anything. I'm using -O2. It doesn't delete the function with <=-O1.
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@marcan42 Is the function marked static? It can't be deleted otherwise. I'm not seeing the same behavior with my gcc. -
@twoscomplement by "deleted" I mean its contents are optimized out. It's still there, just add/lea/sub/reqt, the rest of the code is gone. - Show replies
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