PR/15448: add a compiler timestamp to PCH files (take 2)

[Geoff Keating]

On 17/02/2005, at 5:26 AM, Paolo Bonzini wrote:

>> I think this solves the problem nicely, and fixes the bootstrap 
>> problem.  The only other issue I can think of, is, it is critical 
>> (for the installation of the libstdc++ gch file) that the install 
>> process leaves the mtime alone on the compiler binary.  touch -r 
>> might be necessary to make it work.  touch -r isn't very portable.
>
> The PCH would need to be rebuilt upon installation, or the st_size 
> could be used alone.  The approach of checking addresses are 
> unreliable because of PIE.
>
> Geoff, is the patch okay with only st_size being checked? (I'm not 
> sure if you can approve the libiberty bits.)

Yes, it's OK, except for the libiberty bits which I haven't really 
reviewed.
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