https://bugs.llvm.org/show_bug.cgi?id=34575
Bug ID: 34575
Summary: __attribute__((__format__(printf()))) doesn't warn
about NULL format string
Product: clang
Version: 5.0
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: shab...@gmail.com
CC: llvm-bugs@lists.llvm.org
Take this code:
#include <stdio.h>
int main()
{
printf(NULL, "x");
return 0;
}
gcc helpfully warns that:
<source>: In function 'int main()':
5 : <source>:5:19: warning: null argument where non-null required (argument
1) [-Wnonnull]
printf(NULL, "x");
^
5 : <source>:5:19: warning: too many arguments for format
[-Wformat-extra-args]
while clang doesn't say anything (it doesn't even warn about extra arguments).
It would be nice if it did.
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