Re: [Boost-users] Using c++11 features in clang

Subject: Re: [Boost-users] Using c++11 features in clang
From: Roland Bock (rbock_at_[hidden])
Date: 2012-07-11 09:28:13

On 2012-07-11 15:17, Roland Bock wrote:
> On 2012-07-06 09:31, John Maddock wrote:
>>> In response to a some questions on the boost-users list (and boost
>>> bug reports), I wrote up this:
>>> http://marshall.calepin.co/llvmclang-and-standard-libraries-on-mac-os-x.html
>>>
>>>
>>> I don't know if this should be a FAQ entry for Boost, or for clang.
>>> Suggestions/comments/edits welcome.
>> So.... is there a similarly idiot proof procedure for Clang on Linux?
>>
>> I ask because every time I've tried it, the compiler chokes on
>> libstdc++'s headers, and since there's no libc++ support option for
>> Linux it make's it hard to test/diagnose Clang issues for those of us
>> that don't have a Mac :-(
>>
>> John.
> I use clang like this under Linux:
>
> $ clang -std=c++11 -stdlib=libc++ -lc++ test.cpp
> $ ldd ./a.out
>         linux-vdso.so.1 =>  (0x00007fffe2bff000)
>         libc++.so.1 => /usr/local/lib/libc++.so.1 (0x00007f54ea1d7000)
>         libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1
> (0x00007f54e9fc1000)
>         libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f54e9c2b000)
>         libcxxrt.so => /usr/local/lib/libcxxrt.so (0x00007f54e9a0d000)
>         libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
> (0x00007f54e97ef000)
>         librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f54e95e6000)
>         libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f54e93e2000)
>         /lib64/ld-linux-x86-64.so.2 (0x00007f54ea49a000)
>         libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6
> (0x00007f54e90dc000)
>         libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f54e8e56000)
>
>
> For building the library, I found the essential hint here:
> http://lists.cs.uiuc.edu/pipermail/cfe-dev/2012-March/020381.html
>
> I chose libcxxrt. Works fine in the examples I tried so far.
>
> Without specifying the ABI library, the c++11 code would compile but not
> run, e.g. using std::cerr would crash the program.
>
> Hope that helps and please: Next one to succeed under Linux: Write down
> the exact procedure (I forgot to do so myself).
>
> Regards,
>
> Roland
>
>

I am quite sure I had to add

-DLIBCXXRT

to the EXTRA_FLAGS in the lib/buildit script...