[cfe-dev] Using C++11 <atomic> with Clang SVN

Marc Glisse marc.glisse at inria.fr
Thu Apr 19 23:40:44 PDT 2012

On Thu, 19 Apr 2012, Eli Friedman wrote:

> On Thu, Apr 19, 2012 at 3:46 PM, Marc Glisse <marc.glisse at inria.fr> wrote:
>> On Thu, 19 Apr 2012, Eli Friedman wrote:
>>> Make sure you check out libc++ into llvm/projects/libcxx/, and use
>>> "make install", so clang uses the right libcxx.
>> Wow, that actually works on some OS (macosx only I guess)? It seems so far
>> here...
>> - requires root (chown)
> Yes, that's slightly less than ideal.
>> - doesn't compile the lib
> Not necessary on OS X Lion.

Uh? I'd understand if you said the makefile compiles it on OSX but not on 
other platforms. But saying that it isn't necessary because the system 
provides an older version seems strange.

>> - installs the include files in a place the driver doesn't know
> I'm not sure I follow here... at least on Mac, we search for libcxx
> relative to the clang executable.

Ok, good to know that it works on Mac, thanks. On Linux, the headers get 
installed in $INST/lib/c++/v1, but the driver looks for them in:

     // libc++ is always installed at a fixed path on Linux currently.
     addSystemInclude(DriverArgs, CC1Args,
                      getDriver().SysRoot + "/usr/include/c++/v1");

Marc Glisse

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