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 Is the function marked static? It can't be deleted otherwise. I'm not seeing the same behavior with my gcc.
@twoscomplement Try:
char *foo(const char *a) {
char b[256]; memcpy(b,a,256); return b;
}
Watch the memcpy disappear.
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@marcan42 The compiler can do whatever it likes with invalid input. Be thankful it didn't result in demons flying out of your nose :P -
@twoscomplement I know; I was trying to see whether it would optimize a particular detail out but cheated and got more than I bargained for.
End of conversation
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