How to turn this warning off?

3 msg	Setting up a cross-compile
2 msg	Unexpected failure-to-warn
1 msg	Using special calling conventions
2 msg	Pragmas in GCC
11 msg	building gcc-4.2.0
2 msg	c syntax
2 msg	autovectorization
5 msg	building gcc 4.2.0
1 msg	libgcc_s.so missing copysignl

How to turn this warning off?
\ Sergei Organov (31 May 2007)
. \ Tom St Denis (31 May 2007)
. . \ Sergei Organov (31 May 2007)
. \ Sergei Organov (31 May 2007)

2 msg	GCC porting to 64-bit architecture
8 msg	Cross compiling
3 msg	query regarding LLVM
2 msg	Problem when compiling pointers with GNU
2 msg	fprintf in passes.c
3 msg	RE: GCC Compatibility in C++
1 msg	Re: How to force 16-byte alignment with gfortran?
2 msg	Conflict between compilers
2 msg	How to tell which compiler was used?
1 msg	Function instrumentation

Subject:	How to turn this warning off?
Group:	Gcc-help
From:	Sergei Organov
Date:	31 May 2007

Hello,

I can't find a command-line switch to turn off the following warning:

$ gcc -c warn.cc
warn.cc: In function 'void g(float)':
warn.cc:2: warning: passing 'float' for argument 1 to 'void f(int)'
$ cat warn.cc
extern void f(int);
void g(float x) { f(x); };
$ gcc -v
Using built-in specs.
Target: i486-linux-gnu
Configured with: [...]
Thread model: posix
gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)
$

Any idea except filtering gcc output?

-- Sergei.