[cfe-dev] Howto build clang tools using cmake

[Anwar Ludin]

Hi Nikola,

Thanks for the pointer. Moved the sources to ~/llvm/tools/clang/tools/extra/mytool and updated the CMakeLists.txt to reflect the link you provided, but I am getting the exact same build errors.
Are the docs in synch with  the current Clang API (3.5)? Am I missing a library?

Content of my CMakeLists.txt:

set(LLVM_LINK_COMPONENTS support)
set(LLVM_USED_LIBS clangTooling clangBasic clangAST)

add_clang_executable(find-class-decls FindClassDecls.cpp)

target_link_libraries(find-class-decls
  clangTooling
  clangBasic
  clangASTMatchers
  )


Compiler errors:

[100%] Building CXX object tools/clang/tools/extra/mytool/CMakeFiles/find-class-decls.dir/FindClassDecls.cpp.o
/Users/aludin/clang-llvm/llvm/tools/clang/tools/extra/mytool/FindClassDecls.cpp:17:43: error: member access into incomplete
      type 'clang::ASTContext'
      FullSourceLoc FullLocation = Context->getFullLoc(Declaration->getLocStart());
                                          ^
/Users/aludin/clang-llvm/llvm/tools/clang/include/clang/AST/ASTConsumer.h:20:9: note: forward declaration of
      'clang::ASTContext'
  class ASTContext;
        ^
/Users/aludin/clang-llvm/llvm/tools/clang/tools/extra/mytool/FindClassDecls.cpp:36:33: error: member access into incomplete
      type 'clang::ASTContext'
    Visitor.TraverseDecl(Context.getTranslationUnitDecl());
                                ^
/Users/aludin/clang-llvm/llvm/tools/clang/include/clang/AST/ASTConsumer.h:20:9: note: forward declaration of
      'clang::ASTContext'
  class ASTContext;
        ^
/Users/aludin/clang-llvm/llvm/tools/clang/tools/extra/mytool/FindClassDecls.cpp:44:31: error: virtual function
      'CreateASTConsumer' has a different return type ('clang::ASTConsumer *') than the function it overrides (which has
      return type 'std::unique_ptr<ASTConsumer>')
  virtual clang::ASTConsumer *CreateASTConsumer(
                              ^
/Users/aludin/clang-llvm/llvm/tools/clang/include/clang/Frontend/FrontendAction.h:64:40: note: overridden virtual function is
      here
  virtual std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,


Thanks!

Anwar



On 21 Jul 2014, at 12:08, Nikola Smiljanic <popizdeh at gmail.com> wrote:

> Have you read this http://clang.llvm.org/docs/LibASTMatchersTutorial.html#step-1-create-a-clangtool
> 
> 
> On Mon, Jul 21, 2014 at 7:12 PM, Anwar Ludin <anwar.ludin at gmail.com> wrote:
> Hello,
> 
> Sorry if this question has already been asked. I am trying to compile the "How to write RecursiveASTVisitor based ASTFrontedActions" tutorial located here http://clang.llvm.org/docs/RAVFrontendAction.html by using CMake.
> 
> In order to do this, I created a new "mytool" directory in the clang source tree containing the source code provided in the tutorial:
> 
> ~/llvm/tools/clang/tools/mytool
> 
> The directory contains the CMakeLists.txt and FindClassDecls.cpp provided in the tutorial.
> 
> I have also updated the CMakeLists.txt file located at ~/llvm/tools/clang/tools/ so that the mytool directory is included in the CMake build process.
> 
> However when I try to build the tool, I get the following errors (I suspect the clangTooling library is not found).
> 
> [ 98%] Building CXX object tools/clang/tools/mytool/CMakeFiles/find-class-decls.dir/FindClassDecls.cpp.o
> /Users/aludin/clang-llvm/llvm/tools/clang/tools/mytool/FindClassDecls.cpp:17:43: error: member access into incomplete type
>       'clang::ASTContext'
>       FullSourceLoc FullLocation = Context->getFullLoc(Declaration->getLocStart());
>                                           ^
> /Users/aludin/clang-llvm/llvm/tools/clang/include/clang/AST/ASTConsumer.h:20:9: note: forward declaration of
>       'clang::ASTContext'
>   class ASTContext;
>         ^
> /Users/aludin/clang-llvm/llvm/tools/clang/tools/mytool/FindClassDecls.cpp:36:33: error: member access into incomplete type
>       'clang::ASTContext'
>     Visitor.TraverseDecl(Context.getTranslationUnitDecl());
>                                 ^
> /Users/aludin/clang-llvm/llvm/tools/clang/include/clang/AST/ASTConsumer.h:20:9: note: forward declaration of
>       'clang::ASTContext'
>   class ASTContext;
>         ^
> /Users/aludin/clang-llvm/llvm/tools/clang/tools/mytool/FindClassDecls.cpp:44:31: error: virtual function 'CreateASTConsumer'
>       has a different return type ('clang::ASTConsumer *') than the function it overrides (which has return type
>       'std::unique_ptr<ASTConsumer>')
>   virtual clang::ASTConsumer *CreateASTConsumer(
>                               ^
> /Users/aludin/clang-llvm/llvm/tools/clang/include/clang/Frontend/FrontendAction.h:64:40: note: overridden virtual function is
>       here
>   virtual std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
>                                        ^
> 3 errors generated.
> make[2]: *** [tools/clang/tools/mytool/CMakeFiles/find-class-decls.dir/FindClassDecls.cpp.o] Error 1
> make[1]: *** [tools/clang/tools/mytool/CMakeFiles/find-class-decls.dir/all] Error 2
> make: *** [all] Error 2
> 
> Any help on how to build this would be greatly appreciated.
> 
> Thanks!
> 
> Anwar
> 
> 
> 
> 
> 
> 
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