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Re: gcc -Wunreachable-code option


Hi,
On Wed, May 25, 2011 at 05:14:48AM -0700, Vijayaraghavan Murali wrote:
> 
> I'm trying to make gcc generate warnings for detecting unreachable code
> in a program using -Wunreachable-code. But it simply doesn't seem to
> work, even for a simple program such as:
> int main() { return 1; return 0; }
> 
> I don't find -Wunreachable-code in man gcc, but it doesn't complain if I
> pass the option to it.
> 
> I must be clearly missing something trivial here and would appreciate
> any help. I'm using gcc 4.5.2 and installed gcc-opt, if it matters.

The option was removed january 2010 -- so you would need an older gcc.
to get it.
If I remeber correctly, the concerns were about unpredictability due to
different optimization-option.
See the discussion on http://gcc.gnu.org/ml/gcc-patches/2009-11/msg00179.html

Axel


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