Re: [gentoo-hardened] Problems compiling xen - please help...

["Kevin F. Quinn (Gentoo)" <kevquinn@gentoo.org>]

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On Thu, 02 Feb 2006 15:35:33 -0500
Ned Ludd <solar@gentoo.org> wrote:

> On Thu, 2006-02-02 at 20:35 +0100, Kevin F. Quinn (Gentoo) wrote:
> > On Thu, 02 Feb 2006 13:18:46 -0500
> > Ned Ludd <solar@gentoo.org> wrote:
> > 
> > > On Thu, 2006-02-02 at 17:59 +0000, Ed W wrote:
> > > > Heads up then that when switching compiler to the non-hardened
> > > > one it makes sense to blow away the ccache of disable it's use.
> > > 
> > > That probably makes sense for any time a gcc-config switch
> > > happens. You should probably file a bug about that for the
> > > maintainer of gcc-config.
> > 
> > ccache doesn't take account of anything other than the built-in
> > specs files and stuff specified via --specs - we could just patch
> > ccache to pay attention to GCC_SPECS as well.  I'll take a look.
> 
> Ok cool but keep in mind.
> 
> USE=-hardened emerge gcc
> gcc-config 1
> echo $GCC_SPECS
> 
> USE=hardened emerge gcc
> gcc-config 1
> echo $GCC_SPECS
> 
> Both times it shall be "" with the same version of gcc.

The hash does include the size & mtime of the compiler driver -
although that'll be the wrapper in most cases, I guess, which may not
be good enough.

bug #121336 btw

actually I think hashing the files in GCC_SPECS won't work, as ccache
doesn't see GCC_SPECS because it's set by the compiler wrapper.

I think it may be enough to hash in the output of '<compiler> -v'...
-- 
Kevin F. Quinn

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