[cfe-dev] Questions about libc++ for linux and its git repository (if any)

[Jean-Daniel Dupas]

Le 19 juil. 2012 à 10:45, salvatore benedetto <salvatore.benedetto at gmail.com> a écrit :

> On Thu, Jul 19, 2012 at 10:32 AM, Jean-Daniel Dupas
> <devlists at shadowlab.org> wrote:
>> Le 19 juil. 2012 à 08:30, salvatore benedetto <salvatore.benedetto at gmail.com> a écrit :
>> 
>>> On Wed, Jul 18, 2012 at 10:39 PM, Jean-Daniel Dupas
>>> <devlists at shadowlab.org> wrote:
>>>> 
>>>> Le 18 juil. 2012 à 22:01, salvatore benedetto <salvatore.benedetto at gmail.com> a écrit :
>>>> 
>>>>> Hi there,
>>>>> 
>>>>> I just started using llvm and clang so forgive me for this
>>>>> very simple question.
>>>>> 
>>>>> I'm looking for a git repository for the libcxx (the libcxx.llvm.org
>>>>> website only list svn) and also looking for some info about the
>>>>> current Linux support.
>>>> 
>>>> 
>>>> I don't know what other projects (apart llvm and clang) are available here, but libcxx can be found at  http://llvm.org/git/libcxx.git and compiler-rt at http://llvm.org/git/compiler-rt.git
>>>> 
>>> 
>>> Perfect thanks! May I suggest to have that listed in the project page?
>>> 
>>> Anyway what about the Linux support? Where do I start from?
>>> 
>>> I wanted to start using it for a project of mine (clang++ & libcxx) in
>>> C++11, and even though
>>> I'm not a C++ guru, some part of the STL should still be usable right?
>>> As long as I pass my own
>>> allocator to a container for instance, I should have not problem using
>>> it (exception and memory allocation
>>> excluded).
>>> 
>>> How do I tell clang++ where to look for libcxx (excluded the obvious
>>> -I option)? Any readings you can point me
>>> too?
>>> 
>> 
>> If you checkout the libcxx project in the llvm sources (in projects/libcxx) and build/install clang using autoconf, the headers will automatically be installed where clang++ driver expects them.
>> 
> 
> OK, re-running configure gives me the following in config.log
> 
> configure:3508: WARNING: Unknown project (libcxx) won't be configured
> automatically

This is expected. libc++ does not require "configuration" step. Nonetheless, "make install" will properly find the libc++ headers and install them where needed.

> which doesn't look very good. I pulled libcxx into projects.
> 
>> You can also install them manually in "<prefix>/lib/c++ /v1".
> 
> OK, how do I build and configure it outside llvm? The project page
> doesn't say much,
> except for running builtit.

There is no configure or install script in libc++. You run buildit to build the dynamic library, and then you have to copy it where needed 

>> When invoking clang++, don't forget to pass "-stdlib=libc++" to tell clang you want to use libc++.
>> 
>> I never tried to use it on Linux, so I can't tell where clang look for the libc++ binary when it invoke the linker. You may have to copy it in a standard path (/usr/lib or /usr/local/lib).
>> 
> 
> OK perfect.
> 
> Thanks,
> Salvatore

-- Jean-Daniel