Re: [ggt-devel] Compiler warnings

[Daniel E. S. <dan...@gm...>]

On 9/28/07, Kevin Godby <go...@gm...> wrote:
> Hello.
>
> I'm compiling a VR Juggler app against GMTL version 0.5.4 using g++
> version 4.1.3, and I'm getting the following warnings:
>
> /usr/local/include/gmtl-0.5.4/gmtl/Math.h: In function 'float
> gmtl::Math::fastInvSqrt(float)':
> /usr/local/include/gmtl-0.5.4/gmtl/Math.h:382: warning: dereferencing
> type-punned pointer will break strict-aliasing rules
> /usr/local/include/gmtl-0.5.4/gmtl/Math.h:384: warning: dereferencing
> type-punned pointer will break strict-aliasing rules
> /usr/local/include/gmtl-0.5.4/gmtl/Math.h: In function 'float
> gmtl::Math::fastInvSqrt2(float)':
> /usr/local/include/gmtl-0.5.4/gmtl/Math.h:392: warning: dereferencing
> type-punned pointer will break strict-aliasing rules
> /usr/local/include/gmtl-0.5.4/gmtl/Math.h:394: warning: dereferencing
> type-punned pointer will break strict-aliasing rules
> /usr/local/include/gmtl-0.5.4/gmtl/Math.h: In function 'float
> gmtl::Math::fastInvSqrt3(float)':
> /usr/local/include/gmtl-0.5.4/gmtl/Math.h:403: warning: dereferencing
> type-punned pointer will break strict-aliasing rules
> /usr/local/include/gmtl-0.5.4/gmtl/Math.h:405: warning: dereferencing
> type-punned pointer will break strict-aliasing rules
>
> Is there a way to disable this particular warning for this particular
> GMTL header file (assuming that it's safe to ignore the warning)?

You can pass the -Wno-strict-aliasing flag to gcc.
-Daniel