-Wimplicit-function-declaration doesn't work?

Clang Frontend
#1

I'm trying to get the warning output of the code:

int main(void)
{
  strcmp("abc","def");
  return 0;
}

However, running "clang -Wimplicit-function-declaration" doesn't seem
to produce any output.

Am I doing something wrong?

-Alexei

#2

With -pedantic, I see:

/Users/dgregor/foo.c:3:2: warning: implicit declaration of function 'strcmp' is invalid in C99
         strcmp("abc","def");
         ^
1 diagnostic generated.

  - Doug

#3

Thanks. Shouldn't the other option work as intended, though?

I see in clang.cpp:

static llvm::cl::opt<bool>
WarnImplicitFunctionDeclaration("Wimplicit-function-declaration",
   llvm::cl::desc("Warn about uses of implicitly defined functions"));

Which seems to describe exactly the case I'm testing for... but that
option seems to have no effect.

-Alexei

#4

Thanks. Shouldn't the other option work as intended, though?

Yes, this should be fixed on mainline now, thanks for the report.

-Chris