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Re: [PATCH] sigsegv: Fix build on ppc/musl

From: Sam
Subject: Re: [PATCH] sigsegv: Fix build on ppc/musl
Date: Sun, 13 Mar 2022 16:14:41 +0000

> On 13 Mar 2022, at 14:17, Bruno Haible <bruno@clisp.org> wrote:
> Eric Blake wrote:
>> On Wed, Mar 09, 2022 at 11:37:14PM -0800, Khem Raj wrote:
>>> mcontext is not a standard layout so glibc and musl differ sadly.
>>> Fixes
>>> ../../m4-1.4.19/lib/sigsegv.c: In function 'sigsegv_handler':               
>>>                                     ../../m4-1.4.19/lib/sigsegv.c:223:75: 
>>> error: 'mcontext_t' has no member named 'uc_regs'; did you mean 'gregs'?    
>>> 223 | #    define SIGSEGV_FAULT_STACKPOINTER  ((ucontext_t *) 
>>> ucp)->uc_mcontext.uc_regs->gregs[1]                                         
>>>                                                       |                     
>>>                                                       ^~~~~~~
>> Thanks for the report.  As this file comes from gnulib, the fix needs
>> to go there first.
> Thanks for the report. I'm adding this patch to GNU libsigsegv:
> https://git.savannah.gnu.org/gitweb/?p=libsigsegv.git;a=commitdiff;h=a6ff69873110c0a8ba6f7fd90532dbc11224828c
> and then this (derived) patch to Gnulib.
> I couldn't verify that it works, since there is no Linux distro that is based
> on musl libc and is ported to Linux/powerpc (32-bit).

There's at least Gentoo, Adélie, and at least for now, Void.

Thanks for adding the patch and thanks to Khem for reporting it.


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