How can I make gcc generate a warning if I compare doubles?

Question

I want to catch equality comparisons of doubles in my code and get warnings for them. Is there a GCC warning that will do this?

It's not something that can be easily grepped for in the source code.

Answer 1

GCC 4.7.0 has:

gcc --help=warnings

and it produces, amongst many others:

-Wfloat-equal               Warn if testing floating point numbers for equality

(GCC 4.1.2 does not support the extended help; it 'just' has --help. It does have the warning option, though.)

Answer 2

A quick man gcc reveals this as a likely candidate

    -Wfloat-equal