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Re: [PATCH] Enable unwind info in libc-start.c and backtrace.c
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Wilco Dijkstra <Wilco dot Dijkstra at arm dot com>
- Cc: "Carlos O'Donell" <carlos at redhat dot com>, "libc-alpha at sourceware dot org" <libc-alpha at sourceware dot org>, nd <nd at arm dot com>, Andreas Schwab <schwab at suse dot de>
- Date: Thu, 14 Sep 2017 08:07:59 -0700
- Subject: Re: [PATCH] Enable unwind info in libc-start.c and backtrace.c
- Authentication-results: sourceware.org; auth=none
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On Thu, Sep 14, 2017 at 7:57 AM, Wilco Dijkstra <Wilco.Dijkstra@arm.com> wrote:
> H.J. Lu wrote:
>
>> # CC="gcc -m32 -march=i686" CXX="g++ -m32 -march=i686"
>> /export/gnu/import/git/sources/glibc/configure --prefix=/usr
>> --target=i686-linux --build=i686-linux --host=i686-linux
>> --enable-hardcoded-path-in-tests
>>
>> to configure glibc for i686 on Linux/x86-64. It works fine.
>
> Doing it exactly like that I get:
>
> /work/install/binutils_x64/x86_64-linux-gnu/bin/ld: skipping incompatible /work/install/gcc_x64/lib/gcc/x86_64-linux-gnu/8.0.0/libgcc.a when searching for -lgcc
> /work/install/binutils_x64/x86_64-linux-gnu/bin/ld: cannot find -lgcc
>
> So it doesn't seem to be able to find a 32-bit libgcc although that GCC
> supports -m32...
Please make sure that your GCC has 32-bit libgcc.a:
[hjl@gnu-6 i386]$ gcc -print-libgcc-file-name
/usr/lib/gcc/x86_64-redhat-linux/7/libgcc.a
[hjl@gnu-6 i386]$ gcc -m32 -print-libgcc-file-name
/usr/lib/gcc/x86_64-redhat-linux/7/32/libgcc.a
[hjl@gnu-6 i386]$
--
H.J.