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[Bug ld/29592] [2.39 Regression][bisected] Exec stack warning causes go


From: nickc at redhat dot com
Subject: [Bug ld/29592] [2.39 Regression][bisected] Exec stack warning causes go programs with cgo to fail to link on mips
Date: Wed, 21 Sep 2022 10:13:12 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=29592

Nick Clifton <nickc at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nickc at redhat dot com

--- Comment #1 from Nick Clifton <nickc at redhat dot com> ---
(In reply to matoro from comment #0)
Hi Matoro,

> On mips, since this commit, all linking prints the following warning:
> 
> /usr/lib/gcc/mips64-unknown-linux-gnu/12.2.0/../../../../mips64-unknown-
> linux-gnu/bin/ld: warning:
> /usr/lib/gcc/mips64-unknown-linux-gnu/12.2.0/../../../../lib64/Scrt1.o:
> requires executable stack (because the .note.GNU-stack section is executable)

This was supposed to have been fixed by commit
ed1c7ad8e31a2cfca1d8c8c898ee7cde6ae340ca  
Do you have that commit in your sources ?



> /var/tmp/portage/dev-lang/go-1.19.1/temp/go-link-3757955373/go.o: in
> function `internal/cpu.Initialize':
> /usr/lib/go/src/internal/cpu/cpu.go:123:(.text+0x14): relocation R_MIPS_26
> against `a local symbol' cannot be used when making a shared object;
> recompile with -fPIC

Are you sure that it was that commit which triggered this problem ?

The commit only added code to generate the new warning messages, it did not -
or at least should not - affect the linking process in any other way.

Also - is the warning correct ?  Is the -fPIC option missing from the
compilation command line ?  Or is the linker mistaken when it complains about
attempting to create a shared object ?  (IE is it supposed to be creating a
static executable rather than a dynamic executable ?)

Cheers
  Nick

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