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<H1>[Mageia-dev] Cross compile x86_64 on i586 for icecream?</H1>
<B>Colin Guthrie</B>
<A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20Cross%20compile%20x86_64%20on%20i586%20for%20icecream%3F&In-Reply-To=%3C4DF72DA0.8050805%40colin.guthr.ie%3E"
TITLE="[Mageia-dev] Cross compile x86_64 on i586 for icecream?">mageia at colin.guthr.ie
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<I>Tue Jun 14 11:45:04 CEST 2011</I>
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<PRE>'Twas brillig, and Colin Guthrie at 14/06/11 09:27 did gyre and gimble:
><i> 'Twas brillig, and Christiaan Welvaart at 13/06/11 12:24 did gyre and
</I>><i> gimble:
</I>>><i> On Mon, 13 Jun 2011, Colin Guthrie wrote:
</I>>><i>
</I>>>><i> I'm not exactly a guru with icecream but is it possible to build a
</I>>>><i> toolchain that can allow i586 nodes to compile x86_64 code?
</I>>><i>
</I>>><i> If your question is about the toolchain, have you tried simply passing
</I>>><i> -m64 to gcc?
</I>><i>
</I>><i> OK, so for the record, this doesn't work.
</I>><i>
</I>><i> However I checked out our tool chain and the RPMs accept some handy
</I>><i> arguments. Yay!
</I>><i>
</I>><i> Sadly they don't really work!
</I>><i>
</I>><i> I was able to build binutils via:
</I>><i> rpmbuild --define "cross x86_64" --define "_topdir $(pwd)" -bb
</I>><i> SPECS/binutils.spec
</I>><i>
</I>><i> But then I tried gcc via:
</I>><i> rpmbuild --define "cross_bootstrap x86_64" --define "_topdir $(pwd)"
</I>><i> -bb SPECS/gcc.spec
</I>><i>
</I>><i> (it needs to bootstrap to build glibc which can then be used to rebuild
</I>><i> gcc again fully).
</I>><i>
</I>><i> Sadly this bombed out:
</I>><i> /home/colin/Mageia/gcc/BUILD/gcc-4.5.2/obj-x86_64-mageia-linux-gnu/./gcc/xgcc
</I>><i> -B/home/colin/Mageia/gcc/BUILD/gcc-4.5.2/obj-x86_64-mageia-linux-gnu/./gcc/
</I>><i> -B/usr/x86_64-mageia-linux-gnu/bin/ -B/usr/x86_64-mageia-linux-gnu/lib/
</I>><i> -isystem /usr/x86_64-mageia-linux-gnu/include -isystem
</I>><i> /usr/x86_64-mageia-linux-gnu/sys-include
</I>><i> --sysroot=/home/colin/Mageia/gcc/BUILD/gcc-4.5.2/obj-x86_64-mageia-linux-gnu/../sysroot
</I>><i> -O2 -g -pipe -m32 -O2 -O2 -g -pipe -DIN_GCC
</I>><i> -DCROSS_DIRECTORY_STRUCTURE -DNATIVE_CROSS -W -Wall -Wwrite-strings
</I>><i> -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
</I>><i> -Wold-style-definition -isystem ./include -fPIC -g -DIN_LIBGCC2
</I>><i> -D__GCC_FLOAT_NOT_NEEDED -I. -I. -I../../.././gcc -I../../../../libgcc
</I>><i> -I../../../../libgcc/. -I../../../../libgcc/../gcc
</I>><i> -I../../../../libgcc/../include -I../../../../libgcc/config/libbid
</I>><i> -DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS -DUSE_TLS -o _muldi3.o -MT
</I>><i> _muldi3.o -MD -MP -MF _muldi3.dep -DL_muldi3 -c
</I>><i> ../../../../libgcc/../gcc/libgcc2.c
</I>><i> In file included from ../../../../libgcc/../gcc/tsystem.h:87:0,
</I>><i> from ../../../../libgcc/../gcc/libgcc2.c:29:
</I>><i> /home/colin/Mageia/gcc/BUILD/gcc-4.5.2/obj-x86_64-mageia-linux-gnu/./gcc/include-fixed/stdio.h:13:23:
</I>><i> fatal error: sys/types.h: No such file or directory
</I>><i> compilation terminated.
</I>><i>
</I>><i>
</I>><i>
</I>><i> Now it seems that adding -Dinhibit_libc here works a treat, but I've no
</I>><i> idea if this is appropriate. The files sys/types.h is included in the
</I>><i> source but e.g. sys/syscall.h is not (this is subsequently needed if you
</I>><i> fix the include path to point at the included lsb headers).
</I>><i>
</I>><i>
</I>><i> As I know nothing about the tool chain....
</I>><i>
</I>><i> Q1. Should we be setting -Dinhibit_libc during this bootstrap stage?
</I>><i> Q2. Would it be better to use the lsb-headers instead and somehow find
</I>><i> syscall.h?
</I>><i> Q3. Am I doing something dumb?
</I>
Added <A HREF="https://bugs.mageia.org/show_bug.cgi?id=1794">https://bugs.mageia.org/show_bug.cgi?id=1794</A> on RTPs request.
:<i>)
</I>
--
Colin Guthrie
mageia(at)colin.guthr.ie
<A HREF="http://colin.guthr.ie/">http://colin.guthr.ie/</A>
Day Job:
Tribalogic Limited [<A HREF="http://www.tribalogic.net/">http://www.tribalogic.net/</A>]
Open Source:
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PulseAudio Hacker [<A HREF="http://www.pulseaudio.org/">http://www.pulseaudio.org/</A>]
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