Re: libobjc2 cmake C++ library issue

[Maxthon Chan]

Well somehow I managed to compiled it with CXXFLAGS="-std=c++11 -stdlib=libc++" 
and linked libobjc (with Objective-C++ support) against libc++ (LLVM's C++11 
standard library), that is I made a huge hump of libraries, libobjc2, 
libdispatch and LLVM's libc++ all linked together.

I always use libobjc2 in place of libBlocksRuntime hence libobjc2 and 
libdispatch always link against each other, and now libobjc2 links against 
libc++ too and since libc++ linked against libdispatch, that dragged libobjc2 
in, and by doing that, clang is involved too by linking against libc++ and 
using C++11 features, so does lldb. What a mess...

在 2013-5-21，下午9:21，David Chisnall <address@hidden> 写道：

> On 21 May 2013, at 12:16, Chan Maxthon <address@hidden> wrote:
> 
>> When I tried to compile libobjc2 trunk or 1.7rc1 on Ubuntu server using 
>> clang 3.4 svn, clearly the objc++ part is calling for c++11
> 
> No, it isn't.  It is written in C++98 and does not depend on any C++11 
> features.  It is for interoperability between Objective-C and C++ exceptions.
> 
>> from its asking for c++abi library and c++11 headers
> 
> It is not asking for any C++11 headers and will only build the libobjcxx.so 
> if it can not find the C++ ABI library and so must avoid linking to every 
> ObjC program to libstdc++.
> 
> David
>