[gentoo-embedded] Re: Building Crosscompiler for Embedded System

[gentoo-embedded] Re: Building Crosscompiler for Embedded System

[Harald Schioeberg]

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Just found that thread in the archive, sorry for breaking the thread.

i had the same problem (on mips), setting some environment varibles
solved them:

CHOST="mipsel-softfloat-linux-gnu"
CFLAGS="-O2 -march=4kc -msoft-float -pipe"

CBUILD="i686-pc-linux-gnu"
BUILD_CC="i686-pc-linux-gnu-gcc"
BUILD_CXX="i686-pc-linux-gnu-g++"
BUILD_CFLAGS="-O2 -march=athlon-xp -pipe"
BUILD_CXXFLAGS=${BUILD_CFLAGS}

Harald

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Re: [gentoo-embedded] Re: Building Crosscompiler for Embedded System

[Jan Girlich]

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Harald Schioeberg wrote:
> Just found that thread in the archive, sorry for breaking the thread.

I don't know which thread you are referring to, but maybe it was one of
mine.

> i had the same problem (on mips), setting some environment varibles
> solved them:
> 
> CHOST="mipsel-softfloat-linux-gnu"
> CFLAGS="-O2 -march=4kc -msoft-float -pipe"
[...]

I use cmerge for these purposes (setting vars).

http://www.mail-archive.com/gentoo-embedded@lists.gentoo.org/msg00737.html

Jan
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Re: [gentoo-embedded] Re: Building Crosscompiler for Embedded System

[Harald Schioeberg]

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> I don't know which thread you are referring to, but maybe it was one of
> mine.

Sorry. This question from Lutz Schönemann was refered (at bottom). i
wanted to point out, that setting BUILD_* like in

BUILD_CC="i686-pc-linux-gnu-gcc"
BUILD_CXX="i686-pc-linux-gnu-g++"
BUILD_CFLAGS="-O2 -march=athlon-xp -pipe"
BUILD_CXXFLAGS=${BUILD_CFLAGS}

to build-machine specific flags solved the problem with the
machine-specifc parameters (march) for me.

portage seems not to care for build/target specific CFLAGS, but most
configures do, so exporting this variables in the shell enables some
packages to build (especiallly those, that build build-machine binaries,
like the locals-compiler in glibc)

harald

>> - Using crossdev:
>> The crossdev script worked fine and installed the whole toolchain
>> (stage4: binutils, gcc, linux-headers, etc.). The trouble is that
>> when I want to merge a packege with this compiler (e.g.:
>> CFLAGS="-arch=i386" ROOT=/tmp/cross/ CHOST=i386-unknown-linux-gnu
>> emerge sys-boot/syslinux) it ends up with the message that the
>> compiler is unable to build executables.

>Just in case that wasn't a typo in transcription - you need
>CFLAGS="-march=i386" (with an 'm').  You should look at the config.log
>etc to find out exactly why the compiler couldn't build executables.

>BTW again just in case - if your host is an x86 system,
>you don't need a
>cross-compiler as your host compiler can build for all x86 variants -
>it's enough to get the CFLAGS right; e.g.

>CFLAGS="-march=i386" ROOT=/tmp/cross emerge <pkg>

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