On Thu, Mar 7, 2013 at 9:51 AM, Shashi <[email protected]> wrote:
> Pedro Fonseca <pfonseca@...> writes:
>
>>
>> Hi,
>>
>> I've been trying to cross compile LTP on a 64-bit x86 machine to produce
>> tests for a 32-bit x86 machines. Unfortunately, so far I haven't found a
>> clean way of achieving this.
>>
>> I've tried configuring with "./configure --host=i386" but this still
>> produces x86-64 binaries.
>>
>> I've also tried configuring with "CFLAGS=-m32 ./configure CFLAGS=-m32"
>> but it gives compilation errors on some tests (e.g.
>> testcases/kernel/syscalls/chown01_16). I can get past some of the errors
>> by disabling the "/../utils/compat_16.mk" lines in the individual test
>> Makefiles. But is there a better way to compile LTP for 32-bit on a 64-bit?
>>
>> Thanks,
>> Pedro
>>
>> ------------------------------------------------------------------------------
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>
> Hello Pedra Fonseca,
>
> ./configure --build=i686-pc-linux-gnu --target=i686-pc-linux-gnu "CFLAGS=-m32"
> "CPPFLAGS=-m32" "LDFLAGS=-m32"
>
> I use the above command to build ltp for 32-bit architecture on 64-bit
> machine.
> Once you do run this, you can check the CFLAGS, CPPFLAGS, LDFALGS being set in
> config.status file. --target flag is to set target environment if it is
> different from build environment.
> http://stackoverflow.com/questions/5139403/whats-the-difference-of-configure-option-build-host-and-target
>
> In fedora-64 bit, to build a 32-bit binary you need following packages
> sudo yum install glibc-devel.i686 libgcc.i686
>
> May be in Ubuntu, you may need these packages or similar kind. If not
> installed
> gcc will throw some error. Let me know if you still find problem.
>
> Regards,
> ShashiKiran
>
[ CC Pedro ]
AFAICS "-m32" is available on gcc, dunno if for example clang supports
that, too.
Can't say if "-m32" as LDFLAGS makes any sense or to say IOW "-m32"
for CC is sufficient.
Maybe you can explain that, Shashi?
To support "-m32" CFLAGS for gcc on Debian/Ubuntu you need to install
'gcc-multilib' (gcc with biarch-support) package.
This installs 'libc6-i386' and 'libc6-i386-dev' packages automatically.
$ sudo apt-get update
$ sudo apt-get install gcc-multilib
Another way could be to install multiarch-support if not available
(binutils-mutiarch and multiarch-support packages).
But I should check Debian's/Ubuntu's wiki pages, again... how to build
on amd64 for i386...
Hope this helps people reading this ML.
Regards,
- Sedat -
>
>
>
> ------------------------------------------------------------------------------
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Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
endpoint security space. For insight on selecting the right partner to
tackle endpoint security challenges, access the full report.
http://p.sf.net/sfu/symantec-dev2dev
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