llvm dev - Sep 2010 - [LLVMdev] Cross-compiling the ARM toolchain

Hello,

Is there a quick tutorial to build the LLVM toolchain from a Linux or
Mac OS X x86 host for an ARM v4/v5/v6 ELF target?
It this configuration supported, and is it possible to build the Clang
compiler for this host/target combination?

I know about the installation page, but I keep failing to build this
toolchain with LLVM 2.7. Maybe it is not (yet) supported?

Thanks,
Manu

trying this:
clang -march=armv7-a -mcpu=cortex-a9 -ccc-host-triple
arm-none-linux -ccc-gcc-name arm-none-linux-gnueabi-gcc a.c

2010/9/10 Emmanuel Blot <eblot.ml at gmail.com>:
> Hello,
>
> Is there a quick tutorial to build the LLVM toolchain from a Linux or
> Mac OS X x86 host for an ARM v4/v5/v6 ELF target?
> It this configuration supported, and is it possible to build the Clang
> compiler for this host/target combination?
>
> I know about the installation page, but I keep failing to build this
> toolchain with LLVM 2.7. Maybe it is not (yet) supported?
>
> Thanks,
> Manu
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>

On 10 September 2010 04:47, Liu <proljc at gmail.com>
wrote:
> trying this:
> clang -march=armv7-a -mcpu=cortex-a9 -ccc-host-triple
> arm-none-linux -ccc-gcc-name arm-none-linux-gnueabi-gcc a.c
Hi Liu,

That doesn't work for me.

$ clang -march=armv7-a -mcpu=cortex-a9 -ccc-host-triple arm-none-linux
-ccc-gcc-name arm-none-linux-gnueabi-gcc alias.c
clang: warning: unknown platform, assuming -mfloat-abi=soft
/tmp/cc-0BIpHn.s: Assembler messages:
/tmp/cc-0BIpHn.s:1: Error: unknown pseudo-op: `.syntax'
/tmp/cc-0BIpHn.s:2: Error: unknown pseudo-op: `.cpu'
/tmp/cc-0BIpHn.s:3: Error: unknown pseudo-op: `.eabi_attribute'
/tmp/cc-0BIpHn.s:4: Error: unknown pseudo-op: `.eabi_attribute'
/tmp/cc-0BIpHn.s:5: Error: unknown pseudo-op: `.eabi_attribute'
/tmp/cc-0BIpHn.s:6: Error: unknown pseudo-op: `.eabi_attribute'
/tmp/cc-0BIpHn.s:7: Error: unknown pseudo-op: `.eabi_attribute'
/tmp/cc-0BIpHn.s:8: Error: unknown pseudo-op: `.eabi_attribute'
/tmp/cc-0BIpHn.s:15: Error: no such instruction: `bx lr'
clang: error: assembler command failed with exit code 1 (use -v to see
invocation)

The assembly is fine, but ARM's ELF writer is not, if it's even
getting that far. MC doesn't have ELF yet (right?) and the old ARM ELF
writer had lots of problems, especially on EABI conformity, but that
ASM is pure GNU, so I don't know what's wrong with it.

If you generate assembly and pipe it to GAS then link manually, it
works, but that's far from ideal. I think the long term solution would
be to implement the MC ELF writer for ARM, but you won't get that in
the 2.8.


-- 
cheers,
--renato

http://systemcall.org/

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