llvm dev - Jan 2015 - [LLVMdev] Building clang/llvm without libstdc++ or GPLv3 tools/libraries

Thank Ismail for quick reply.

I read that Linux, we need to build...
 (1) libcxx (without libcxxabi) ==> done
(2) build libcxxabi ==> failing with following error
(3) and then re-build libcxx

By the way I am building libcxx and libcxxabi Out-of-tree llvm build.

Please correct me if I am missing something.

Thank you.
-Hiral


-----Original Message-----
From: İsmail Dönmez [mailto:ismail at donmez.ws] 
Sent: Wednesday, January 28, 2015 5:17 PM
To: Oza, Hiral
Cc: cfe-dev at cs.uiuc.edu; llvmdev at cs.uiuc.edu
Subject: Re: [LLVMdev] Building clang/llvm without libstdc++ or GPLv3
tools/libraries

On Wed, Jan 28, 2015 at 1:31 PM, Oza, Hiral <Hiral.Oza at netapp.com>
wrote:
> Greetings!!!
>
>
>
> Could you please suggest ways to build clang/llvm without libstdc++?
>
> In short, to avoid using GPLv3 libraries or tools while building
clang/llvm.
Have a look at libc++ (http://libcxx.llvm.org/), you can use it in place of
libstdc++.

ismail

On 1/28/15 4:57 AM, Oza, Hiral wrote:
> Thank Ismail for quick reply.
>
> I read that Linux, we need to build...
>   (1) libcxx (without libcxxabi) ==> done
> (2) build libcxxabi ==> failing with following error
What's the error?
> (3) and then re-build libcxx
I don't think you need to build & rebuild libcxx. The correct order is:

   1) build libcxxabi
   2) build libcxx
   3) test libcxxabi
   4) test libcxx

This is because of some unfortunate layering violations in libcxxabi, 
where it depends on the c++ library's headers.  Also, the libcxxabi 
tests depend on libcxx being built.


Cheers,

Jon
>
> By the way I am building libcxx and libcxxabi Out-of-tree llvm build.
>
> Please correct me if I am missing something.
>
> Thank you.
> -Hiral
>
>
-- 
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded

We ship PNaCl's LLVM on Linux and Mac with libc++ and libc++abi. We build a
libc++.so/dylib that includes the libc++abi files directly and doesn't
depend on libstdc++ at all (it does depend on libc.so and libgcc_s.so; on
mac it only depends on libSystem.B.dylib and not on any external
libc++abi). Doing it this way sidesteps any layering issues with libc++ and
libc++abi.

On Wed Jan 28 2015 at 6:42:30 AM Jonathan Roelofs <jroelofs.lists at
gmail.com>
wrote:
>
>
> On 1/28/15 4:57 AM, Oza, Hiral wrote:
> > Thank Ismail for quick reply.
> >
> > I read that Linux, we need to build...
> >   (1) libcxx (without libcxxabi) ==> done
> > (2) build libcxxabi ==> failing with following error
> What's the error?
> > (3) and then re-build libcxx
> I don't think you need to build & rebuild libcxx. The correct order
is:
>
>    1) build libcxxabi
>    2) build libcxx
>    3) test libcxxabi
>    4) test libcxx
>
> This is because of some unfortunate layering violations in libcxxabi,
> where it depends on the c++ library's headers.  Also, the libcxxabi
> tests depend on libcxx being built.
>
>
> Cheers,
>
> Jon
> >
> > By the way I am building libcxx and libcxxabi Out-of-tree llvm build.
> >
> > Please correct me if I am missing something.
> >
> > Thank you.
> > -Hiral
> >
> >
>
> --
> Jon Roelofs
> jonathan at codesourcery.com
> CodeSourcery / Mentor Embedded
> _______________________________________________
> 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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