llvm dev - Mar 2015 - [LLVMdev] How to Cross Compile libcompiler_rt Static Library?

I need to correct myself.  It is possible to cross compile it on Windows,
but not using the provided build systems.

On Sun, Mar 29, 2015 at 12:52 PM, Daniel Dilts <diltsman at gmail.com>
wrote:
> I asked about this same question in the past (month or three ago).  It is
> not possible to cross compile compiler-rt on Windows.  If you want to cross
> compile you should use the make build system, not the CMake build system.
>
> On Sun, Mar 29, 2015 at 9:26 AM, Chao Yan <yanchao2012 at gmail.com>
wrote:
>
>>
>> 2015-03-29 3:33 GMT-05:00 Ed Schouten <ed at 80386.nl>:
>>
>>> I am cross-compiling compiler-rt for my specific use-case. That
said,
>>> I'm cross-compiling from x86-64 to x86-64, but for a different
ABI.
>>> This is what I use:
>>>
>>>
>>>
https://github.com/NuxiNL/cloudlibc/wiki/Building-runtime-libraries#user-content-compiler-rt
>>>
>>> -DCMAKE_CROSSCOMPILING=True
>>>
>>> As you can see, I'm using CMake. Works pretty well so far.
Hopefully
>>> something like this will work for you as well?
>>>
>>
>> I tried "cmake ../compiler-rt -DCMAKE_C_COMPILER=clang
>> -DCMAKE_CXX_COMPILER=clang++  -DLLVM_NATIVE_ARCH=ARM
>> -DLLVM_TARGETS_TO_BUILD=ARM -DTARGET_TRIPLE=armv-none-linux-gnueabi
>>  -DCMAKE_CROSSCOMPILING=True". It will still build X86_64 version.
>>
>> I also tried "cmake ../compiler-rt
>> -DCMAKE_C_COMPILER=/usr/local/arm-2009q3/bin/arm-none-linux-gnueabi-gcc
>>
-DCMAKE_CXX_COMPILER=/usr/local/arm-2009q3/bin/arm-none-linux-gnueabi-g++
>>  -DLLVM_NATIVE_ARCH=ARM -DLLVM_TARGETS_TO_BUILD=ARM
>> -DTARGET_TRIPLE=armv-none-linux-gnueabi  -DCMAKE_CROSSCOMPILING=True
>> ". the configure process generate errors:
>>
>> CMake Error at cmake/config-ix.cmake:111 (message):
>> Cannot compile for x86_64:
>>
>> It seems that the cmake only works for X86 target?
>>
>> Thanks,
>> Chao
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>>
>
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2015-03-29 15:11 GMT-05:00 Daniel Dilts <diltsman at gmail.com>:
> I need to correct myself.  It is possible to cross compile it on Windows,
> but not using the provided build systems.

Hi Daniel,

Thanks for helping. I'm using ubuntu 14.04 x86_64 system. I've tried
cmake
for couple of days until I give up. You are right, using make build system
seems more feasible. I've combined the compiler_rt/make/platform/
clang_linux.mk and the compiler_rt/make/platform/clang_macho_embedded.mk.
So far it could cross-compile all of the files in
"compiler-rt/lib/builtins/" (*.c files). However, the libcompiler_rt.a
still missing functions such as "__aeabi_memset",
"__aeabi_memcpy". These
functions were in "compiler_rt/lib/biltins/arm/" (*.S) files. They are
not
included in any of the *.mk files. Do you have any idea on how to add these
assembly sources to the build list? BTW, did you build the complete
libcompiler_rt.a at the end?

Thanks,
Chao
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I was attempting to cross compile on Windows.  I ended up having to find
the list in the CMake build system (not very hard) and manually creating a
makefile to compile them.  Took maybe 2 hours total.

On Sun, Mar 29, 2015 at 1:28 PM, Chao Yan <yanchao2012 at gmail.com>
wrote:
>
> 2015-03-29 15:11 GMT-05:00 Daniel Dilts <diltsman at gmail.com>:
>
>> I need to correct myself.  It is possible to cross compile it on
Windows,
>> but not using the provided build systems.
>
>
> Hi Daniel,
>
> Thanks for helping. I'm using ubuntu 14.04 x86_64 system. I've
tried cmake
> for couple of days until I give up. You are right, using make build system
> seems more feasible. I've combined the compiler_rt/make/platform/
> clang_linux.mk and the compiler_rt/make/platform/clang_macho_embedded.mk.
> So far it could cross-compile all of the files in
> "compiler-rt/lib/builtins/" (*.c files). However, the
libcompiler_rt.a
> still missing functions such as "__aeabi_memset",
"__aeabi_memcpy". These
> functions were in "compiler_rt/lib/biltins/arm/" (*.S) files.
They are not
> included in any of the *.mk files. Do you have any idea on how to add these
> assembly sources to the build list? BTW, did you build the complete
> libcompiler_rt.a at the end?
>
> Thanks,
> Chao
>
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