[PATCH, v3] PR 35954: rebuild of precompiled headers

[Benjamin Kosnik]

> The 'touch' was added by
> <http://gcc.gnu.org/ml/libstdc++/2006-07/msg00080.html>.  IMVHO it is
> superfluous: the header file is not newer just because a new
> precompiled header exists for it.  The precompiled header should not
> generate rebuilds of depending files.  

Agreed.

No, I think I was just sloppy when redoing this to remove installation
support for PCHes.

> was added because of the bug fixed in
> <http://gcc.gnu.org/ml/gcc-patches/2008-03/msg01103.html> which hasn't
> been reviewed yet.  But maybe there's another reason I'm not aware of?

I thought I reviewed this, but cannot find it in the archives. Will do
asap.

Can you send me links of any other unreviewed libstdc++ patches? Thanks.

> While we're at it, let's inline the 'mkdir -p' here, too, as it saves
> a fork during the first build, and doesn't increase the number of
> forks on subsequent builds.  (And would fix potential parallel build
> errors for non-GNU make, not sure if that's relevant for libstdc++.)
> 
> OK for trunk and 4.3?  I've had this patch for a while, but I'll be
> bootstrapping it again just in case.

Yes, this is fine. Thanks for fixing this. Please put this on trunk and
gcc-4_3-branch.

-benjamin