llvm dev - Jan 2010 - [LLVMdev] building a llvm-arm-elf crosscompiler on OSX 10.5

Dear ML,

I'm trying to understand how to build a llvm (2.6) cross compiler for
arm-elf target using the gcc frontend with newlib. Could you please
indicate, if possible steps I should follow?

I try to configure and build llvm with

../llvm-2.6/configure
--prefix=/usr/local/cross-llvm-gcc-arm-elf-4.2-2.6 --enable-optimized
--disable-threads --enable-targets=cbe,cpp,arm

and LLVM-GCC frontend with

../llvm-gcc4.2-2.6.source/configure
--prefix=/usr/local/cross-llvm-gcc-arm-elf-4.2-2.6
--program-prefix=llvm-
--enable-llvm=/Users/dummy/Develop/llvm/llvm-2.6
--enable-languages=c,c++ --host=i686-apple-darwin9
--build=i686-apple-darwin9 --target=arm-elf
--with-gxx-include-dir=/usr/include/c++/4.0.0 --enable-interwork
--with-newlib --with-header=../newlib-1.18.0/newlib/libc/include

But I got the followings errors:

/var/folders/7f/7fiRIEm-FruFfT7mGbk3uk+++TI/-Tmp-//ccDFjySd.s:
Assembler messages:
/var/folders/7f/7fiRIEm-FruFfT7mGbk3uk+++TI/-Tmp-//ccDFjySd.s:96:
Error: selected processor does not support `sxtb r5,r5'
/var/folders/7f/7fiRIEm-FruFfT7mGbk3uk+++TI/-Tmp-//ccDFjySd.s:537:
Error: selected processor does not support `sxtb r6,r6'
/var/folders/7f/7fiRIEm-FruFfT7mGbk3uk+++TI/-Tmp-//ccDFjySd.s:705:
Error: selected processor does not support `sxtb r1,r1'
/var/folders/7f/7fiRIEm-FruFfT7mGbk3uk+++TI/-Tmp-//ccDFjySd.s:711:
Error: selected processor does not support `sxtb r1,r1'


Thank you for your help,

pz

Hello
> But I got the followings errors:
>
> /var/folders/7f/7fiRIEm-FruFfT7mGbk3uk+++TI/-Tmp-//ccDFjySd.s:
> Assembler messages:
> /var/folders/7f/7fiRIEm-FruFfT7mGbk3uk+++TI/-Tmp-//ccDFjySd.s:96:
Correct. You haven't specified any ARM specific stuff during llvm-gcc
conffigure (cpu type, fpu type, floating point abi, etc). This means
that default will be used. LLVM defaults to something like ARMv5,
binutils - to ARMv4. So, you just need to configure llvm-gcc properly.

Keep in mind, that binutils for ARM are known to be buggy, you need to
use binutils CVS snapshot (and even this is buggy - some bugs are not
yet fixed there).

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

Dear Anton,

Thanks for your help!
I had a look to llvm (2.6) configure options but I couldn't find any
way to specify cpu type, fpu ecc..Could you please give me any
indication and/or example? I want to try llvm with Atmel's
AT91SAM7X256 (core is  ARM7TDMI )

Thank you again,

pz

2010/1/9 Anton Korobeynikov <anton at
korobeynikov.info>:
> Hello
>
>> But I got the followings errors:
>>
>> /var/folders/7f/7fiRIEm-FruFfT7mGbk3uk+++TI/-Tmp-//ccDFjySd.s:
>> Assembler messages:
>> /var/folders/7f/7fiRIEm-FruFfT7mGbk3uk+++TI/-Tmp-//ccDFjySd.s:96:
> Correct. You haven't specified any ARM specific stuff during llvm-gcc
> conffigure (cpu type, fpu type, floating point abi, etc). This means
> that default will be used. LLVM defaults to something like ARMv5,
> binutils - to ARMv4. So, you just need to configure llvm-gcc properly.
>
> Keep in mind, that binutils for ARM are known to be buggy, you need to
> use binutils CVS snapshot (and even this is buggy - some bugs are not
> yet fixed there).
>
> --
> With best regards, Anton Korobeynikov
> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>