// RUN: %clang_cc1 -isystem %S -Wdouble-promotion -fsyntax-only %s 2>&1 | FileCheck -allow-empty %s
// CHECK-NOT: warning:
#include <no-warn-in-system-macro.c.inc>
int main(void)
{
double foo = 1.0;
if (isnan(foo))
return 1;
return 0;
}