llvm dev - Jul 2009 - [LLVMdev] llvm-gcc cross compiler for ARM Linux failing

I suspect that my llvm-gcc cross compiler  is using the wrong
assembler because it does not recognize "-mcpu=cortex-a8".

I was trying to build a cross compiler for a Mac host. Now I am trying
to build on x86_64 Linux. I am targeting a Beagle board with an ARM
Cortex-A8 and Angstrom Linux.

TRIED: to use the script in llvm/utils/crosstool/ARM/build-install-linux.sh
I used the recommended version of CodeSourcery and the same SVN revision.

RESULT: llvm-gcc builds but when I try to use it I get "as:
unrecognized option `-meabi=4'"

TRIED: using the latest CodeSourcery 2009q1 and latest LLVM REV 74564

RESULT: llvm-gcc failed to build with this error:

   /tmp/ccVSwC0h.s:535: Error: selected processor does not support
`strd r2,[r6]'
   make[3]: *** [libgcc/./_udivmoddi4.o] Error 1

TRIED: adding --with-cpu=cortex-a8    to configuration for llvm-gcc

RESULT: llvm-gcc now builds but when I try to use it I get "as:
unrecognized option `-mcpu=cortex-a8'"

I suspect it is using the wrong assembler. But when I do llvm-gcc -v I
can see it has:

 
--with-gnu-as=/home/neel/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-linux-gnueabi-as

If I use that assembler directly I get an executable but  printf,
fflush and others are UNDefined.

I can compile programs using the CodeSourcery gcc toolchain just fine.
I did not even have to install the runtime code on the Beagle Board.
it just worked.

Any suggestions?

Has anyone recently built an LLVM cross compiler for ARM Linux?

Thanks,
Neel

On Jul 2, 2009, at 6:24 PM, Neel Nagar wrote:
> I suspect that my llvm-gcc cross compiler  is using the wrong
> assembler because it does not recognize "-mcpu=cortex-a8".
This is a known problem.  We've only added support for ARMv7  
(including cortex-a8) in llvm in the last week or so, and the  
associated changes for llvm-gcc are still pending.  Unless you need  
specific features of your cortex-a8 processor, you should be able to  
make progress getting things to work by specifying an older ARMv6  
processor.
>
> I was trying to build a cross compiler for a Mac host. Now I am trying
> to build on x86_64 Linux. I am targeting a Beagle board with an ARM
> Cortex-A8 and Angstrom Linux.
>
> TRIED: to use the script in llvm/utils/crosstool/ARM/build-install- 
> linux.sh
> I used the recommended version of CodeSourcery and the same SVN  
> revision.
>
> RESULT: llvm-gcc builds but when I try to use it I get "as:
> unrecognized option `-meabi=4'"
>
> TRIED: using the latest CodeSourcery 2009q1 and latest LLVM REV 74564
>
> RESULT: llvm-gcc failed to build with this error:
>
>   /tmp/ccVSwC0h.s:535: Error: selected processor does not support
> `strd r2,[r6]'
>   make[3]: *** [libgcc/./_udivmoddi4.o] Error 1
>
> TRIED: adding --with-cpu=cortex-a8    to configuration for llvm-gcc
>
> RESULT: llvm-gcc now builds but when I try to use it I get "as:
> unrecognized option `-mcpu=cortex-a8'"
>
> I suspect it is using the wrong assembler. But when I do llvm-gcc -v I
> can see it has:
>
>  --with-gnu-as=/home/neel/CodeSourcery/Sourcery_G++_Lite/bin/arm- 
> none-linux-gnueabi-as
>
> If I use that assembler directly I get an executable but  printf,
> fflush and others are UNDefined.
>
> I can compile programs using the CodeSourcery gcc toolchain just fine.
> I did not even have to install the runtime code on the Beagle Board.
> it just worked.
>
> Any suggestions?
>
> Has anyone recently built an LLVM cross compiler for ARM Linux?
>
> Thanks,
> Neel
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

Hi, Bob
> This is a known problem.  We've only added support for ARMv7
> (including cortex-a8) in llvm in the last week or so, and the
> associated changes for llvm-gcc are still pending.
The processor support part itself was committed ~month ago. I built
llvm-gcc  for cortex-a8 / a9 and arch armv7-a without any problems. I
have no idea, however, whether codesourcery tools in question support
these targets - I built binutils by myself.

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

Hi, Neel
> I suspect it is using the wrong assembler. But when I do llvm-gcc -v I
> can see it has:
>
>
 --with-gnu-as=/home/neel/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-linux-gnueabi-as
But how's assembler actually called? Just try to compile something
with extra -v option added

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

Hello Anton,

Thanks for replying.

The message "as: unrecognized option `-mcpu=cortex-a8'"
is the same message I get when I just enter:

  as -mcpu=cortex-a8

So I think I llvm-gcc is using the Linux i386 assembler to assemble
ARM code. Not good.  What assembler is it supposed to use? The one in
CodeSourcery?
> But how's assembler actually called? Just try to compile something
> with extra -v option added
Did:   llvm-gcc -v simple.c
-------------------------------------------
Using built-in specs.
Target: arm-none-linux-gnueabi
Configured with: /home/neel/xllvm/build-xl/src/llvm-gcc-4.2/configure
--enable-languages=c,c++
--enable-llvm=/home/neel/xllvm/install-xl/llvm-project/x86_64-unknown-linux-gnu/arm-none-linux-gnueabi/llvm
--prefix=/home/neel/xllvm/install-xl/llvm-project/x86_64-unknown-linux-gnu/arm-none-linux-gnueabi/llvm-gcc-4.2
--program-prefix=llvm- --target=arm-none-linux-gnueabi
--with-cpu=cortex-a8
--with-gnu-as=/home/neel/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-linux-gnueabi-as
--with-gnu-ld=/home/neel/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-linux-gnueabi-ld
--with-sysroot=/home/neel/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc
Thread model: posix
gcc version 4.2.1 (Based on Apple Inc. build 5646) (LLVM build)
 /home/neel/xllvm/install-xl/llvm-project/x86_64-unknown-linux-gnu/arm-none-linux-gnueabi/llvm-gcc-4.2/libexec/gcc/arm-none-linux-gnueabi/4.2.1/cc1
-quiet -v simple.c -quiet -dumpbase simple.c -mcpu=cortex-a8 -auxbase
simple -version -o /tmp/ccWsERFx.s
ignoring nonexistent directory
"/home/neel/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc/usr/local/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/neel/xllvm/install-xl/llvm-project/x86_64-unknown-linux-gnu/arm-none-linux-gnueabi/llvm-gcc-4.2/lib/gcc/arm-none-linux-gnueabi/4.2.1/include
 /home/neel/xllvm/install-xl/llvm-project/x86_64-unknown-linux-gnu/arm-none-linux-gnueabi/llvm-gcc-4.2/lib/gcc/arm-none-linux-gnueabi/4.2.1/../../../../arm-none-linux-gnueabi/include
 /home/neel/CodeSourcery/Sourcery_G++_Lite/arm-none-linux-gnueabi/libc/usr/include
End of search list.
GNU C version 4.2.1 (Based on Apple Inc. build 5646) (LLVM build)
(arm-none-linux-gnueabi)
        compiled by GNU C version 4.1.2 20071124 (Red Hat 4.1.2-42).
GGC heuristics: --param ggc-min-expand=96 --param ggc-min-heapsize=131072
Compiler executable checksum: f4d5e7abe212ada5d54f7df3985c1fb4
 as -mcpu=cortex-a8 -meabi=4 -o /tmp/ccsbmdt5.o /tmp/ccWsERFx.s
as: unrecognized option `-mcpu=cortex-a8'
------------------------------------------

Thanks,
Neel

On Fri, Jul 3, 2009 at 5:40 AM, Anton
Korobeynikov<anton at korobeynikov.info> wrote:
> Hi, Neel
>
>> I suspect it is using the wrong assembler. But when I do llvm-gcc -v I
>> can see it has:
>>
>>
 --with-gnu-as=/home/neel/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-linux-gnueabi-as
> But how's assembler actually called? Just try to compile something
> with extra -v option added
>
> --
> With best regards, Anton Korobeynikov
> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>