Building LLVM/Clang wit CMake about castxml

[MarkOates]

I had similar difficulties building CastXML. Notably confusions about the meaning of "LLVM/Clang compiler SDK install tree", distinctions between the dependencies of LLVM and Clang, and knowing when/where/how to properly configure install prefixs.

After looking through the mailing list (http://public.kitware.com/mailman/listinfo/castxml) I came across @thewtex's CastXMLSuperbuild. Which, quite frankly, is a real lifesaver. 👏

https://github.com/thewtex/CastXMLSuperbuild

[thewtex]

Hello,

What compiler are you using? Is it Visual Studio 2012 / MSVC or later?

[alexnatch]

Hello,

I have Visual Studio 2012 and Visual Studio 2010n I have the same errors with the two compilers

[thewtex]

Is LLVM installed into a prefix path?

[thewtex]

(as opposed to trying to use it in its build tree). Only building against an installed version is currently supported.

[alexnatch]

I have downloaded the source of LLVM via guthub: http://llvm.org/releases/download.html
And I have tried to build it with Cmake

[thewtex]

Basic instructions to build LLVM/Clang are found here:

http://clang.llvm.org/get_started.html

If these instructions have been followed, try starting the initial CMake configuration on a clean build tree from a command prompt that has executed the appropriate vcvars.bat file from Visual Studio.

[alexnatch]

Thanks,

I am following the instructions and I don't know which version of subversion should I take ?
Is VisualSVN for Visual Studio goof for windows ?

[thewtex]

If you downloaded the 3.6.0 source tar.xz, it can be extracted with 7Zip and subversion is not required

[alexnatch]

I have used subversion but I still have the same problem when using CMake:

I have lots of errors like this

CMake Error: File /cygdrive/c/Users/qi11091/Documents/Logiciels/llvm/utils/llvm-build/llvmbuild/init.py does not exist.
CMake Error at C:/Users/qi11091/Documents/Logiciels/llvm-build/LLVMBuild.cmake:330 (configure_file):
configure_file Problem configuring file
Call Stack (most recent call first):
CMakeLists.txt:432 (include)

It search for files in a linux way (/cygdrive/c/...) instea of searching in windows way

Would the problem be solved if i install the pre built binaries instead of the sources ?

[thewtex]

As indicated in the documentation, you will need Python installed to build the tests.

I have not tried using the pre-built binaries. Please try it and report your experiences.

[alexnatch]

I have installed python and GnuWin32Tools but I still can not build the project files via CMake:

CMake Error: File /cygdrive/c/Users/qi11091/Documents/Logiciels/llvm/utils/llvm-build/llvmbuild/main.py does not exist.
CMake Error at C:/Users/qi11091/Documents/Logiciels/llvm-build/LLVMBuild.cmake:334 (configure_file):
configure_file Problem configuring file
Call Stack (most recent call first):
CMakeLists.txt:432 (include)

CMake Error: File /cygdrive/c/Users/qi11091/Documents/Logiciels/llvm/utils/llvm-build/llvmbuild/componentinfo.py does not exist.
CMake Error at C:/Users/qi11091/Documents/Logiciels/llvm-build/LLVMBuild.cmake:336 (configure_file):
configure_file Problem configuring file
Call Stack (most recent call first):
CMakeLists.txt:432 (include)

[bradking]

CMake Error: File /cygdrive/c/Users/.../main.py does not exist.

This looks like the build tree has been generated with Cygwin tools involved. No Cygwin should be in the PATH when building for Windows. Start again with a fresh build tree and make sure no Cygwin tools are found.

[alexnatch]

SO i have to remove all the paths related to cygwin in te PATH systemvariable ?

[bradking]

You don't necessarily have to remove them from your system's PATH. You could configure a command prompt environment to have its own PATH that does not include Cygwin. However, in general I avoid running with Cygwin in the PATH unless I'm at an actual Cygwin shell prompt intending to run Cygwin tools. It is too easy for Windows programs to mistake Cygwin tools for versions that support Windows. Cygwin != Windows.

[alexnatch]

I managed to build the project for LLVM/Clang, I can see the executables in teh release folder I created with Visual Studio 12 but when I tried to build CastXML I have 5 build succeeded and 1 failed, here is the error:

Cannot open include file: 'clang/AST/ASTContext.h' : No such file or directory
Cannot open include file: 'clang/AST/ASTConsumer.h' : No such file or directory

[bradking]

Cannot open include file: 'clang/AST/ASTContext.h' : No such file or directory

This likely means you pointed LLVM_DIR at the llvm build tree. The CastXML README.rst build instructions say it needs the "LLVM/Clang compiler SDK install tree". Reconfigure llvm with CMAKE_INSTALL_PREFIX set to point somewhere useful and then build the INSTALL target. Make sure you build CastXML with the same configuration (e.g. Debug or Release) you chose to install for LLVM.

[alexnatch]

Is that this path that I have to Reconfigure for CMAKE_INSTALL_PREFIX: /share/llvm/cmake

[bradking]

Reconfigure for CMAKE_INSTALL_PREFIX: /share/llvm/cmake

Yes. Point it to somewhere like C:/Users/qi11091/Documents/Logiciels/llvm-install.

[alexnatch]

Ok thanks ! I have downloaded the llvm source tree and with svn and clang the same way :
Checkout LLVM:

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

Checkout Clang:

cd llvm\tools
svn co http://llvm.org/svn/llvm-project/cfe/trunk clang

Is it correct ?

[bradking]

Is it correct ?

That looks like the right checkout commands to me.

[alexnatch]

Thanks
How Can I do to only build the install target ? Is it not possible to build all the solution ?

[bradking]

When you load the project in the IDE, right-click on the INSTALL target and choose the option to build it.

[alexnatch]

Is it the install target right on the llvm tree ?

C:\Users\qi11091\Documents\Logiciels\llvm-build\INSTALL ?

[alexnatch]

I have build the install target for LLVM and also for CastXML after but I have still the same errors:

Error   1   error C1083: Cannot open include file: 'clang/AST/ASTContext.h': No such file or directory  C:\Users\qi11091\Documents\Logiciels\CastXML-master\src\Output.cxx  21
Error   2   error C1083: Cannot open include file: 'clang/AST/ASTConsumer.h': No such file or directory C:\Users\qi11091\Documents\Logiciels\CastXML-master\src\RunClang.cxx    24

Error   3   error MSB3073: The command "setlocal
"C:\Program Files (x86)\CMake\bin\cmake.exe" -DBUILD_TYPE=Release -P cmake_install.cmake
if %errorlevel% neq 0 goto :cmEnd
:cmEnd
endlocal & call :cmErrorLevel %errorlevel% & goto :cmDone
:cmErrorLevel
exit /b %1
:cmDone
if %errorlevel% neq 0 goto :VCEnd
:VCEnd" exited with code 1. C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120                         \Microsoft.CppCommon.targets 132

[bradking]

You still need to configure CastXML with its LLVM_DIR option pointing to the location of LLVMConfig.cmake within the install tree rather than that in the build tree.

[thewtex]

@MarkOates thanks for the kind feedback :-)