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Date: Mon, 25 Jan 2016 12:17:22 -0500
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: Bits deduplication: current situation
On Mon, Jan 25, 2016 at 09:08:03AM +0100, Natanael Copa wrote:
> On Sun, 24 Jan 2016 22:59:25 -0500
> Rich Felker <dalias@...c.org> wrote:
>
> > I'm about to try starting the bits deduplication, but before getting
> > started, I took a quick survey of the current bits headers we have:
>
> ....
>
> > Ideas/requests/preferences/etc.?
>
> It would be nice to be able to build 32-bit boot loaders on 64 bit
> hosts with gcc -m32. Currently that does not work due to it picks up 64
> bit inttypes. We have a patch for xen's hvmloader:
>
> http://git.alpinelinux.org/cgit/aports/tree/main/xen/musl-hvmloader-fix-stdint.patch
> http://git.alpinelinux.org/cgit/aports/tree/main/xen/stdint_local.h
>
> Introduced with this commit:
> http://git.alpinelinux.org/cgit/aports/commit/main/xen/musl-hvmloader-fix-stdint.patch?id=bcf7b52774f1b0a3e405a207c3c4a5342b951f40
>
>
> This is for stdint.h but I think its related and I assume it affects
> limits.h too.
I don't really see a good way to fix this. musl is not designed for
treating "related" 32- and 64-bit archs as if they were a common arch.
It would probably not be hard to make this one usage case work in
practice, but it would be fragile and incomplete.
Is there a reason you can't just pass -nostdinc and then -I the gcc
include dir to use gcc's freestanding headers for a non-native target
like this? IMO the cleanest (albeit somewhat costlier) solution would
be just installing a proper i386 cross compiler.
Alternatively maybe gcc's -m32 could be fixed to use completely
different include paths rather than trying to use the same headers for
different archs. This actually affects third-party installed headers
that are generated for the target arch too, which may be wrongly
picked up if -m32 is used.
Rich
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