llvm-project/clang/test/Sema/attr-format_arg.c

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#include <stdio.h>
const char* f(const char *s) __attribute__((format_arg(1)));
void g(const char *s) {
printf("%d", 123);
printf("%d %d", 123); // expected-warning{{more '%' conversions than data arguments}}
printf(f("%d"), 123);
printf(f("%d %d"), 123); // expected-warning{{more '%' conversions than data arguments}}
}