[LLVMdev] Cross-compiling the ARM toolchain

[Renato Golin]

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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