[lld] r254003 - Revert "ELF: Make .note.GNU-stack more compatible with traditional linkers."

[Hal Finkel via llvm-commits]

----- Original Message -----
> From: "Rui Ueyama" <ruiu at google.com>
> To: "Hal Finkel" <hfinkel at anl.gov>
> Cc: "Joerg Sonnenberger" <joerg at britannica.bec.de>, "llvm-commits" <llvm-commits at lists.llvm.org>
> Sent: Tuesday, November 24, 2015 4:11:54 PM
> Subject: Re: [lld] r254003 - Revert "ELF: Make .note.GNU-stack more compatible with traditional linkers."
> 
> On Tue, Nov 24, 2015 at 2:10 PM, Hal Finkel < hfinkel at anl.gov >
> wrote:
> 
> 
> ----- Original Message -----
> > From: "Rui Ueyama via llvm-commits" < llvm-commits at lists.llvm.org >
> > To: "Joerg Sonnenberger" < joerg at britannica.bec.de >,
> > "llvm-commits" < llvm-commits at lists.llvm.org >
> > Sent: Tuesday, November 24, 2015 3:38:39 PM
> > Subject: Re: [lld] r254003 - Revert "ELF: Make .note.GNU-stack more
> > compatible with traditional linkers."
> > 
> > On Tue, Nov 24, 2015 at 1:31 PM, Joerg Sonnenberger via
> > llvm-commits
> > < llvm-commits at lists.llvm.org > wrote:
> > 
> > 
> > On Tue, Nov 24, 2015 at 12:24:08PM -0800, Rui Ueyama wrote:
> > > My stance is they should fix the loader to ignore the section.
> > 
> > Impossible. It's the equivalent of the BIOS. It can't be fixed.
> > 
> > Well, they can continue using the linker they are currently using.
> > 
> > We may want to revisit this later, but at this moment I really want
> > to focus on simplicity and general usability on major Unix systems
> > instead of supporting relatively minor platforms.
> > 
> 
> Why don't we just omit PT_GNU_STACK when -z execstack is provided? Or
> add a -z nognuptstack (modulo bikeshedding)?
> 
> Do you need that?
> 

Personally, no. But it seems like a reasonable compromise. There's no reason we need to omit non-standard headers when not needed, and if I understand the semantics correctly, omitting PT_GNU_STACK when -z execstack is provided is semantically equivalent to our current behavior (while making the binaries a few bytes smaller).

Thanks again,
Hal

> 
> -Hal
> 
> 
> 
> > 
> > Joerg
> > _______________________________________________
> > llvm-commits mailing list
> > llvm-commits at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
> > 
> > 
> > _______________________________________________
> > llvm-commits mailing list
> > llvm-commits at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits
> > 
> 
> --
> Hal Finkel
> Assistant Computational Scientist
> Leadership Computing Facility
> Argonne National Laboratory
> 
> 

-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory