Re: [gentoo-user] Re: How does Gentoo deal with GCC's header fixes?

[Volker Armin Hemmann]

On Thursday 09 September 2010, walt wrote:
> On 09/08/2010 03:10 PM, Nikos Chantziaras wrote:
> > When building GCC, it will scan all headers in /usr/include and apply
> > fixes to them, and then copy them and use the modified versions.  Now a
> > binary distro (AFAIK) will ship the GCC modified headers, so there's no
> > problem.
> >
> > Gentoo on the other hand will work as intended by GCC only if the user
> > re-emerges GCC after every time a package is emerged that installs
> > headers. Obviously, no user does that.
> >
> > So the question is simple; does Gentoo deal with this problem in any way?
>
> Maybe I misunderstand your question, but AFAIK the only reason to
> re-compile any package is if the libraries it links to have changed, no?
>
> AFAICS gcc links only to libraries installed by glibc. therefore in the
> case of recompiling gcc itself, it should need/use only the headers
> installed by glibc.
>
> (And the only reason to re-compile an existing glibc is if the linux kernel
> headers change.  I always re-compile glibc when the linux kernel headers
> change, but I never thought about re-compiling gcc as well.  Maybe I
> should.)
>
> Corrections are requested if I'm wrong about all of this.

hm, I never recompile glibc after a header update.... or anything else....