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