https://llvm.org/bugs/show_bug.cgi?id=28416
Bug ID: 28416
Summary: malloc is optimized out for release build
Product: clang
Version: 3.8
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: dmark...@mac.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
the following code behaves incorrectly
int main(int argc, const char * argv[]) {
size_t need_size = 0x1000000000000;
void *data = malloc(need_size);
if(data == NULL) {
printf("data == NULL\n");
return 1;
} else {
printf("data != NULL\n");
}
free(data);
return 0;
}
it returns
data != NULL
Program ended with exit code: 0
but it should return
data == NULL
Program ended with exit code: 1
gcc handles that situation correctly
clang shouldn't optimize it out, because result of the malloc is used and
caller of my program relies on the exit code
Note, clang flag -fno-builtin prevents clang from malloc optimize out
and solve the problem.
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