Status: New
Owner: ----
CC: [email protected]
Labels: Type-Defect Priority-Medium OpSys-All
New issue 260 by [email protected]: ASan breaks dead stripping
(-ffunction-sections/-Wl,-gc-section on Linux, -dead_strip on OSX)
http://code.google.com/p/address-sanitizer/issues/detail?id=260
Test case by Ryan Govostes:
================================================
int undefined();
int (*unused)() = undefined;
int main() {
return 0;
}
================================================
$ clang++ t.cc -o t -Wl,--gc-sections -ffunction-sections
-fsanitize=address -mllvm -asan-globals=0
$ clang++ t.cc -o t -Wl,--gc-sections -ffunction-sections
-fsanitize=address -mllvm -asan-globals=1
/tmp/t-1710b5.o:(.data+0x0): undefined reference to `undefined()'
clang-3.5: error: linker command failed with exit code 1 (use -v to see
invocation)
This happens because ASan creates a per-module global array that references
every global in the module irrespective of its usage.
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