[LLVMbugs] [Bug 19679] New: Warn when the return value of memcpy is compared to

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19679

            Bug ID: 19679
           Summary: Warn when the return value of memcpy is compared to 0
           Product: clang
           Version: 3.4
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ju.orth at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Consider this code:
```
#include <string.h>

int f(char *a);
int f(char *a)
{
    return memcpy(a, "test", 4) != 0;
}
```
It is clear that this memcpy should actually be memcmp. The comparison makes no
sense and should cause clang to emit a warning.

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