http://llvm.org/bugs/show_bug.cgi?id=12199
Bug #: 12199
Summary: const strings not consolidated in -O0
Product: clang
Version: 3.0
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
For the program below. clang 3.1 returns "different" unless you optimize it
with -O2 or higher. In gcc 4.2 and VC, the code always return "same" no
matter in -O0 or -O2.
Some code was written with this assumption, they know all the keys are from
const strings so they do pointer compare instead string compare. There're might
be more code relies on this behavior.
#include <stdio.h>
#define LAYER_KEY L"Layer"
struct TEST {
const wchar_t* key;
}gTESTINFO = {
LAYER_KEY
};
int main() {
const wchar_t* key = LAYER_KEY;
if (gTESTINFO.key == key)
printf("same\n");
else
printf("different\n");
return 0;
}
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