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Subject: Re: [boost] Clang 3.4 failing to compile boost 1.57 headers
From: Bjørn Roald (bjorn_at_[hidden])
Date: 2015-01-18 04:10:27

On 18. jan. 2015 07:17, Robert Dailey wrote:

> Thanks for the quick feedback everyone! How do I check what library
> its using? I'm not very comfortable in linux environment and I've done
> most of my development on Windows. Really appreciate the help.

If you add -v on the command line to clang++ it will tell you.
Look for a line like:
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8

Here is a one line command you may try.
echo '#include <vector>' | clang++ -c -xc++ -v -o /dev/null -

-c is compile only
-xc++ specify language for STDIN input file
-o /dev/null throw away the output
- specify to use STDIN as input

You may also just look around for the library files, but you sort of
need to know where:

ls -l /usr/include/c++
lists 2 directories and a symbolic link on my system:
drwxr-xr-x 12 root root 4096 nov. 20 16:40 4.8
lrwxrwxrwx 1 root root 3 april 5 2014 4.8.2 -> 4.8
drwxr-xr-x 5 root root 4096 des. 13 16:08 v1

v1 is for libc++
4.8 is for libstdc++

find /usr/lib -name "*c++*"

If you try to use -stdlib=libc++ on ubuntu, I have found linking to be
tricky with the default ABI that is compatible with GCC on ubuntu. I
have found most advise on the net to be less than useful with
complicated command lines that clang often interprets as errors and
ignores -- this is a mess. So I leave a little hint of a trick used in
FreeBSD that works great, although it is really hacking on the ubuntu
install it is worth it

As root rename or delete the /usr/lib/x86_64-linux-gnu/
symblolic link and create a file with the same name having this GROUP
command to the linkers/loaders.

GROUP ( /usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/ )

First entry is as the symbolic link was, the second one is added
afterwards to add the ABI from libstdc++.

Thanks to David Chisnall for his post here


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