LLVM/Clang compiler for MinGW

[killerbot]

on your instructions for building libcxx :

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mkdir build-release
cd  build-release  <======================
cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release ..


[killerbot]

build and installed clang and libc++ with your instructions, then let CB autodetect it, it finds it in /usr/local/clang.

But when trying a "hello world" , it fails to compile since it doesn't ind the headers (iostream).
What should be the correct location ?
Timestamps wise I think this was a result of the build too : /usr/local/include/c++/v1/ ? => when using this , compiles but now linker problems (eg . :  main.cpp:4: undefined reference to `std::__1::cout')

Also my linux shell doesn't seem to know  about clang (yet), though I did ldconfig, and /usr/local/bin is already in my path (this is also where codeblocks executable is).

EDIT : on the linking problem : added to Cb for clang compiler settings :
linker path : /usr/local/lib
link lib : c++

==> links but at run time :  error while loading shared libraries: libc++.so.1: cannot open shared object file: No such file or directory

[eranif]

I forgot to mention that you will need libc++abi as well.., building it on linux does not work "out-of-the-box" but requires a small tweak:

First, checkout libcxxabi:

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svn co http://llvm.org/svn/llvm-project/libcxxabi/trunk libcxxabi

Next:

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cd libcxxabi/lib


Now you need to add some include paths... otherwise it will not compile:
run:

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g++ -v  -x c++ /dev/null -fsyntax-only

Locate the output line which is similar to this:

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/usr/lib/gcc/x86_64-linux-gnu/4.7/include

Adjust CXX environment variable so it will be something similar to this:

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export CXX='clang++ -I/usr/local/include/c++/v1 -I/usr/lib/gcc/x86_64-linux-gnu/4.7/include'
and compile libcxxabi by simply typing:

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./buildit

once the compilation is done, you should have a new lib: libc++abi.so.1.0
I could not find a simple way of installing so I copied it manually to /usr/local/lib and created 2 symlinks:

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ln -sf /usr/local/lib/libc++abi.so.1.0 /usr/local/lib/libc++abi.so
ln -sf /usr/local/lib/libc++abi.so.1.0 /usr/local/lib/libc++abi.so.1


Now compiling with clang++/libc++ should be like this:

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clang++ -stdlib=libc++ -c test.cpp -I/usr/local/include/c++/v1
clang++ -stdlib=libc++ test.o -o TestMe -lc++ -lc++abi -I/usr/local/include/c++/v1/

Eran

[killerbot]

Thanks Eran, but not yet ok for me :

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error while loading shared libraries: libc++abi.so.1: cannot open shared object file: No such file or directory


[eranif]

Did you remember to add /usr/local/lib to LD_LIBRARY_PATH?

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export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH

In addition, note that you should create 2 symlinks

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ln -sf /usr/local/lib/libc++abi.so.1.0 /usr/local/lib/libc++abi.so
ln -sf /usr/local/lib/libc++abi.so.1.0 /usr/local/lib/libc++abi.so.1

Eran

[killerbot]

I did not do the export (export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH) , but it is in my normal path, is that not sufficient ?
And in the compiler settings of clang in CB, I even added that path as the dirs where the linker can go find libs.

I did create the 2 symlinks.

[eranif]

but it is in my normal path, is that not sufficient

Do you mean its in your PATH environment variable? LD_LIBRARY_PATH is for locating libraries during runtime
PATH is used to locate binaries (unlike Windows...)

I even added that path as the dirs where the linker can go find libs

And from what I understood the linker did _find_ it. Its just that the runtime linker did not find them (it needs LD_LIBRARY_PATH)

Eran

[killerbot]

yes, it is not in my PATH ;-) /usr/local/bin is

In a console I did :

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killerbot@XIII:~/Projects/TryOUt/ClangC11/Deliv/Debug> ./ClangC11
./ClangC11: error while loading shared libraries: libc++abi.so.1: cannot open shared object file: No such file or directory
killerbot@XIII:~/Projects/TryOUt/ClangC11/Deliv/Debug> export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
killerbot@XIII:~/Projects/TryOUt/ClangC11/Deliv/Debug> ./ClangC11
Segmentation fault


for a simple

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#include <iostream>

int main()
{
   std::cout << "Hello world!" << std::endl;
   return 0;
}

In /usr/local/lin I also have the boost libs from my distro. I think these can be found by programs that need it ?

In /usr/local/lib64, the codeblocks so's end up. And when CB is launched (which is located in /usr/local/bin) that one is however able to find it's so files, while that path is also not in $LD_LIBRARY_PATH

for me it is :

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echo $LD_LIBRARY_PATH
/usr/lib64/mpi/gcc/openmpi/lib64


So it seems there might be a few things going wrong, explicit path specification is bneeded, while other libs in there or in lib64 can be found, and in the end crash

[eranif]

BTW, which distro do you use?

I am using Ubuntu 12.10/64
and it is running without a problem...

Can you post the compiler output and the linker ?


Eran

[osdt]

build and installed clang and libc++ with your instructions, then let CB autodetect it, it finds it in /usr/local/clang.
...
Also my linux shell doesn't seem to know  about clang (yet), though I did ldconfig, and /usr/local/bin is already in my path (this is also where codeblocks executable is).

It's probably not installed in /usr/local. Try:

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find /usr/local -name clang++


EDIT : on the linking problem : added to Cb for clang compiler settings :
linker path : /usr/local/lib
link lib : c++

clang++ searches it's install-path/lib to find default libs.

==> links but at run time :  error while loading shared libraries: libc++.so.1: cannot open shared object file: No such file or directory

A single call to ldconfig [/usr/local/lib] shoud do it. Check if '/usr/local/lib' is in the default lib-path:

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grep 'usr/local' /etc/ld.so.conf


- osdt

[Jenna]

I can compile C::B with clang (except for thre contrib-plugins, LibFinder, Profiler and NassiShneiderman) without any tweaking or self-compiling of clang on Fedora 18.
And it seems to run (at least it starts without issues.
C::B from inside C::B.
Compiler is detected as gcc 4.1.2 on starthere-page.

[Alpha]

If you do not have a particular reason to self-compile Clang, installing it through apt-get works fine.

I can compile C::B with clang (except for thre contrib-plugins, LibFinder, Profiler and NassiShneiderman) without any tweaking or self-compiling of clang on Fedora 18.
And it seems to run (at least it starts without issues.
C::B from inside C::B.

Also works in Ubuntu 12.04 and 13.04.

[eranif]

If you do not have a particular reason to self-compile Clang, installing it through apt-get works fine

I think that the problem here is not compiling clang (from what I understand killerbot we are beyond it)
We are trying to make clang to use a different std++ library named "libc++" which on linux also requires libc++abi
both needs to be self compiled (libc++abi build instructions are only available for OSX and not for Linux not to mention Windows...)

Eran

[killerbot]

all paths are in :

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find /usr/local -name clang++
/usr/local/bin/clang++


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grep 'usr/local' /etc/ld.so.conf
/usr/local/lib64
/usr/local/lib


so why does it not find the .so's

[osdt]

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grep 'usr/local' /etc/ld.so.conf
/usr/local/lib64
/usr/local/lib


so why does it not find the .so's

Hmm ... did you run ldconfig after installation of libc++ successfully? Try ...

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# run ldconfig
sudo /sbin/ldconfig
# check if libc++ has been found
sudo /sbin/ldconfig -p | grep 'libc++'


- osdt