[swift-dev] Standard shared libraries with executable stack

[Sangjin Han]

Please review the PR #3053.

2016-06-18 0:17 GMT+09:00 Dmitri Gribenko <gribozavr at gmail.com>:

> On Fri, Jun 17, 2016 at 7:31 AM, Sangjin Han <tinysun.net at gmail.com>
> wrote:
> > Hi,
> >
> > When linking libswiftCore.so, gold linker with --warn-execstack option
> > generates following messages.
> > /usr/bin/ld.gold: warning: lib/swift/linux/x86_64/swift_begin.o: missing
> > .note.GNU-stack section implies executable stack
> > /usr/bin/ld.gold: warning: lib/swift/linux/x86_64/swift_end.o: missing
> > .note.GNU-stack section implies executable stack
> >
> > I found the web page about the GNU-stack section.
> > http://en.chys.info/2010/12/note-gnu-stack/
> >
> > After quick testing in my build system (Linux + execstack -q), I think we
> > should append one line to stdlib/public/runtime/swift_sections.S, or pass
> > the proper option to the linker.
> > The line is
> >     .section .note.GNU-stack,"", at progbits
> > and the option is
> >     '-z noexecstack' (or -Wl,-z -Wl,noexecstack for clang++).
>
> The patch would be much better I think.  Thank you very much for the
> investigation!  Could you submit a pull request?
>
> Dmitri
>
> --
> main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
> (j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/
>
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