http://llvm.org/bugs/show_bug.cgi?id=16942
Bug ID: 16942
Summary: clang should warn about memcmp of pointers to structs
with padding
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
This is almost always a bug:
#include <string.h>
struct foo {
char x; int y;
};
int test(struct foo *P, struct foo *Q) {
return memcmp(P, Q, sizeof(struct foo));
}
because the padding between the elements of the struct fields is being compared
as well. It would be nice for clang to warn on this. LLVM itself tripped over
this recently.
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