[LLVMdev] Is cross-compiling for ARM on x86 with llvm/Clang possible?

[Journeyer J. Joh]

Hello Sid

I checked the binary with "readelf -l" and you are right. Originally, it
pointed the one of the host system. It has to be the one of the target
system. This is why the option
Wl,-dynamic-linker,path_to_target_dynamic_loader is needed.

I understood this issue now.
Thank you very much!

Regards

Journeyer J. Joh


2012/6/27 Sid Manning <sidneym at codeaurora.org>

> On 06/27/12 07:24, Journeyer J. Joh wrote:
>
>> Hello,
>>
>> With your kind concern and help, I now can make a binary for ARM target.
>>
>> ./clang -v --save-temps -ccc-host-triple arm-none-linux-gnueabi
>> --sysroot=/home/hum/Documents/**Projects/arm_toolchain/arm-**
>> 2010.09/arm-none-linux-**gnueabi/libc
>> -gcc-toolchain /home/hum/Documents/Projects/**arm_toolchain/arm-2010.09
>> hello.c -o hello
>>
>> The build command is shown above.
>>
>> After that, I prepared an ARM laptop, AC100 - TOSHIBA.
>> I installed Ubuntu 12.04 in the way guided from the link below.
>>
>> https://wiki.ubuntu.com/ARM/**TEGRA/AC100<https://wiki.ubuntu.com/ARM/TEGRA/AC100>
>>
>> So I moved the final binary from host PC to AC100 and executed.
>> But the binary DIDN'T RUN.
>>
>> $./hello
>>
>> returns an error message below.
>>
>> bash: ./hello: No such file hello
>>
>>
> You could try readelf -l hello and check the INTERP header.  When I've
> seen this message usually PT_INTERP points to something that the kernel
> can't find.
>
>
>
>  I need to understand why it doesn't run on ARM laptop.
>>
>> I compiled another sample program hi.c on the ARM laptop and compared
>> both - the one cross compiled "hello" and the other self host compiled
>> "hi".
>>
>> Output message of utility "file" is almost the same except Linux
>> version, one is 2.6.16 and the other is 2.6.31. But the output of "ldd"
>> shows something meaningful.
>>
>
> This is curious based on the output from ldd below, does file report each
> as, "dynamically linked".
>
>
>
>> ldd hi
>>     libc.so.6 => /lib/arm-linux-gnueabihf/libc.**so.6 (0xb6ecf000)
>>     /lib/ld-linux-armhf.so.3 (0xb6fc3000)
>>
>> ldd hello
>>     not a dynamic executable
>>
>>
>>


-- 
----------------------------------------
Journeyer J. Joh
o o s a p r o g r a m m e r
a t
g m a i l  d o t  c o m
----------------------------------------
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120629/c0701ba5/attachment.html>