|From:||Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>|
|To:||Andres Freund <andres(at)anarazel(dot)de>|
|Subject:||Re: Reduce function call costs on ELF platforms|
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Andres Freund <andres(at)anarazel(dot)de> writes:
> Basically they way we currently build our extensions, the compiler & linker
> assume every symbol inside the extension libraries needs to be interceptable
> by the main binary. Which means that all function calls to symbols visible
> outside the current translation unit need to be made indirectly via the PLT.
Yeah, that would be nice to improve.
> The easier approach for this class of issues is to use the linker option
I don't recall details, but we've previously rejected the idea of
trying to use -Bsymbolic widely; apparently it has undesirable
side-effects on some platforms. See commit message for e3d77ea6b
(hopefully there's some detail in the email thread ). It sounds
like you're not actually proposing that, but I thought it would be
a good idea to note the hazard here.
> By compiling with -fno-plt, the above becomes:
Does -fno-plt amount to an ABI change? If so, I'm worried that it'd
break the ability to compile extensions with a different compiler.
Also, we have at least some places where there actually are cross-calls
between extensions, eg hstore_perl -> plperl. Do we need to worry about
regards, tom lane
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