llvm dev - Sep 2014 - [LLVMdev] Can libc++ build for arm cross compiler?

The following web say the libc++abi is ready on
arm.http://libcxxabi.llvm.org/spec.html
I try to build libc++ and libc++abi for host x86_64(linux) and target arm(linux)
but fail.I have read the web http://llvm.org/docs/HowToCrossCompileLLVM.html
Does anyone know whether it's available for my need? If you know how to
build, what is the build options you use?
Best regards
cschen
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On 09/30/2014 02:37 AM, gamma_chen wrote:
> The following web say the libc++abi is ready on arm.
> http://libcxxabi.llvm.org/spec.html
>
> I try to build libc++ and libc++abi for host x86_64(linux) and target 
> arm(linux) but fail.
> I have read the web http://llvm.org/docs/HowToCrossCompileLLVM.html
>
> Does anyone know whether it's available for my need? If you know how 
> to build, what is the build options you use?
>
I use libc++ and libc++abi (as well as compiler-rt) for the ELLCC cross 
compilation tool chain project (http://ellcc.org). I use makefiles to 
build the libc++ stuff, which are pretty dependent on being used in an 
ELLCC environment. You can get pre built binaries from 
ftp://ellcc.org/pub. The tarballs contain pre built libraries for ARM 
(as well as Mips, x86, PowerPC, and semi-functional Microblaze).

-Rich
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Hi cschen,

Here are the test scripts which I written when I was developing ARM
exception handling support:
https://github.com/loganchien/libcxx-scripts

The script should work on Debian wheezy (cross-compiling from amd64 to
armhf.)

In general, here are the necessary steps:
1. Get a working arm-linux-gnueabihf gcc/g++ toolchain (for the headers and
libraries)
2. Setup the include search path (e.g. /usr/arm-linux-gnueabihf/include)
3. Compile with correct compiler/linker flags (e.g. -target
arm-linux-gnueabihf and some cmake tricks)

Feel free to let me know if you have encountered any problem.

Sincerely,
Logan

On Tue, Sep 30, 2014 at 5:22 PM, Richard Pennington <rich at pennware.com>
wrote:
>  On 09/30/2014 02:37 AM, gamma_chen wrote:
>
>  The following web say the libc++abi is ready on arm.
> http://libcxxabi.llvm.org/spec.html
>
>  I try to build libc++ and libc++abi for host x86_64(linux) and target
> arm(linux) but fail.
> I have read the web http://llvm.org/docs/HowToCrossCompileLLVM.html
>
>  Does anyone know whether it's available for my need? If you know how
to
> build, what is the build options you use?
>
>  I use libc++ and libc++abi (as well as compiler-rt) for the ELLCC cross
> compilation tool chain project (http://ellcc.org). I use makefiles to
> build the libc++ stuff, which are pretty dependent on being used in an
> ELLCC environment. You can get pre built binaries from ftp://ellcc.org/pub.
> The tarballs contain pre built libraries for ARM (as well as Mips, x86,
> PowerPC, and semi-functional Microblaze).
>
> -Rich
>
> _______________________________________________
> 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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>
> I try to build libc++ and libc++abi for host x86_64(linux) and target
> arm(linux) but fail.
>
Failing in what way? If this isn't working out of the box, we've done
something wrong.

jroelofs might know more...
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On 10/3/14 10:16 AM, Dan Albert wrote:
>>
>> I try to build libc++ and libc++abi for host x86_64(linux) and target
>> arm(linux) but fail.
>>
> 
> Failing in what way? If this isn't working out of the box, we've
done
> something wrong.
Yeah, it would help to know more specifics about where you're getting
stuck.
> 
> jroelofs might know more...
For my baremetal arm toolchain, I use buildit&testit for libc++abi, and
buildit&lit for libc++... Which is a bit different than what you'll get
out of
using cmake for it. Also, I've customized both buildits, the testit, and
libc++'s lit config file to do this, and those changes are very specific to
my
environment (I don't recommend using buildit/testit to build either library
unless you're working on porting them to a new platform. Even then, just do
it
the "right way" with cmake, and don't be stupid like me ;] ).


Cheers,

Jon

-- 
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded