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List Info
Thread: Re: pieworld (was Re: TESTING kevquinn_overlays: amd64 hardened gcc - (bugzilla is
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| Re: pieworld (was Re: TESTING
kevquinn_overlays: amd64 hardened gcc -
(bugzilla is |
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2007-01-22 19:52:31 |
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On Thu, 18 Jan 2007, Kevin F. Quinn wrote:
[...]
> > > The way to build a PIE, as I understand it, is to:
> > >
> > > (1) compile all objects -fPIE
> > > (2) link with -fPIE -pie
> >
> > (2) link with -pie (-fPIE does not/should not influence linking)
>
> I would have thought so, however gcc info says:
>
> `-pie'
> Produce a position independent executable on targets which support
> it. For predictable results, you must also specify the same set
> of options that were used to generate code (`-fpie', `-fPIE', or
> model suboptions) when you specify this option.
>
> so I was just following that advice. I suspect it makes no difference
> on x86, amd64, ppc - but perhaps it does on some platforms.
-fPIE|-fpie is only for compiling, -pie applied to gcc propagates to ld as
well (and chooses the right crt files.
I cant remember seeing -fPIE propagated to ld, try to provide it to ld and
it will fail, so gcc filters it out
> I think that when linking, the gcc driver also processes the cc1 spec,
> (where you've added ${pie:-fPIE}) so our default is to add '-fPIE -pie'
> anyway.
I have added -pie compile option for consistency to have gcc -pie do
proper compiling and linking (piepatch/nondef/*), vanilla gcc will ignore
-pie for compile and propagates it to ld on linking
[...]
>
> Why would anyone link a lib*.a into a shared library? Surely you would
> just link to the .so?
because maybe a shared version is not present at all
> stuff, to check the configure fix. If libstdc++.a is acceptable -fPIE
> then I think we're fine - if you really need it -fPIC, then that
> implies you're linking it into shared libraries which is strange.
true for all libs having also .so counterparts, then it is expectable that
shared libs (in fact everything non-static) links against .so
Peter
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Peter S. Mazinger ID: 0xA5F059F2
Key fingerprint = 92A4 31E1 56BC 3D5A 2D08 BB6E C389 975E A5F0 59F2
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