http://llvm.org/bugs/show_bug.cgi?id=13715
Bug #: 13715
Summary: null-conversion warning needs to be suppressed in
macro expansion
Product: clang
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Macros can accept pointer-like arguments which they would check for
non-null-ness using operator!. Currently clang warns in those cases, but I
don't think that warning in macro expansion contexts makes a lot of sense.
ehsan@teenux:/tmp$ cat test.cpp
#include <stdio.h>
#define foo(x) if (!(x)) printf("x");
int main() {
int* p;
foo(p);
foo(NULL);
}
ehsan@teenux:/tmp$ clang -Wnull-conversion test.cpp
test.cpp:6:3: warning: implicit conversion of NULL constant to 'bool'
[-Wnull-conversion]
foo(NULL);
^~~~~~~~~
test.cpp:2:22: note: expanded from macro 'foo'
#define foo(x) if (!(x)) printf("x");
~ ^
1 warning generated.
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