Re: [boost] Using Clang compiler in place of GCC

Subject: Re: [boost] Using Clang compiler in place of GCC
From: Edward Diener (eldiener_at_[hidden])
Date: 2015-06-23 16:00:09

On 6/23/2015 7:41 AM, Paul A. Bristow wrote:
> I have installed Clang 3.6.1 (along with previously used versions of GCC)
>
> downloaded from LLVM and using the clang for LLVM Windows installer on Windows 8.1
>
> I:\modular-boost\libs\fixed_point\example>clang++ --version
> clang version 3.6.1 (tags/RELEASE_361/final)
> Target: i686-pc-windows-gnu
> Thread model: posix
>
> suggests that I have the compiler in place OK and it should be in my PATH (becos I asked for it to
> be).
>
> --debug-configuration
>
> notice: will use 'C:/LLVM/bin/clang++.exe' for clang-linux, condition <toolset>clang-linux-3.6.1
>
> For a project, I have a jamfile starting
>
> project
>     : requirements
>       <include>../include # quickdox/include
>       <include>../../.. # modular-boost root
>       #toolset requirements.
>       # GCC requirements.
>      #<toolset>gcc:<cxxflags>-std=gnu++11 # If requires C++11 library.
>      <toolset>gcc:<cxxflags>-Wno-unused-local-typedefs
>      <toolset>gcc:<cxxflags>-Wno-missing-braces
>      # Clang requirements.
>      #<toolset>clang:<cxxflags>-std=c++11 # If requires C++11 library.
>
> (I also have environment BOOST_ROOT = I:\modular-boost)
>
> when I run b2 toolset=gcc
>
> all compiles and run as expected.
>
> when I run b2 toolset=clang
>
> I get messages like
>
> common.mkdir ..\..\..\bin.v2\libs\quickdox\example\quick_auto_dox_index.test\clang-linux-3.6.1
> common.mkdir ..\..\..\bin.v2\libs\quickdox\example\quick_auto_dox_index.test\clang-linux-3.6.1\debug
>
> clang-linux.compile.c++.without-pth ..\..\..\bin.v2\libs\quickdox\example\quick_auto_dox_index.test\
> clang-linux-3.6.1\debug\quick_auto_dox_index.obj
> quick_auto_dox_index.cpp:53:10: fatal error: 'iostream' file not found  (or other files like
> cstddef, iomanip on other projects)
> #include <iostream>
>           ^
> 1 error generated.
>
>    "C:/LLVM/bin/clang++.exe" -c -x c++ -O0 -g -fno-inline -Wall -g -march=i686 -m32  -DBOOST_ALL_NO_L
> IB=1 -I"..\..\.." -I"..\include" -o "..\..\..\bin.v2\libs\quickdox\example\quick_auto_dox_index.test
> \clang-linux-3.6.1\debug\quick_auto_dox_index.obj" "quick_auto_dox_index.cpp"
>
> (Full log attached).
>
> This suggests that it is not finding the system file <iostream> ...
>
> but I'm puzzled at what is missing (and why).
>
> Suggestions most welcome.

Reiterating what Peter says you need a mingw distribution at c:\mingw or 
you need c:\mingw to be a symbolic directory link to your Mingw 
distribution. Not only that but the distribution needs to be mingw and 
not mingw-64. I have mentioned this dependence on only mingw (as oposed 
to the better mingw-64 ) on the clang developers mailing list and 
someone has replied telling me that they intend to work on compatibility 
with mingw-64, but you know how that goes...

I have found that the latest mingw distribution works with clang.