[cfe-dev] Howto build clang tools using cmake

[Anwar Ludin]

OK finally managed to compile the code in the tutorial.

The errors are probably due to Clang API changes. Is there a way to notify the clang guys so that they update the tutorial in order to reflect the latest API?

-  needed to add the include: #include "clang/AST/ASTContext.h"

- Changed FindNamedClassAction::CreateASTConsumer() to return a std::unique_ptr<ASTConsumer> instead of a raw pointer ASTConsumer*.

- Here is the updated code:

#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendAction.h"
#include "clang/Tooling/Tooling.h"

using namespace clang;

class FindNamedClassVisitor
  : public RecursiveASTVisitor<FindNamedClassVisitor> {
public:
  explicit FindNamedClassVisitor(ASTContext *Context)
    : Context(Context) {}

  bool VisitCXXRecordDecl(CXXRecordDecl *Declaration) {
    if (Declaration->getQualifiedNameAsString() == "n::m::C") {
      FullSourceLoc FullLocation = Context->getFullLoc(Declaration->getLocStart());
      if (FullLocation.isValid())
        llvm::outs() << "Found declaration at "
                     << FullLocation.getSpellingLineNumber() << ":"
                     << FullLocation.getSpellingColumnNumber() << "\n";
    }
    return true;
  }

private:
  ASTContext *Context;
};

class FindNamedClassConsumer : public clang::ASTConsumer {
public:
  explicit FindNamedClassConsumer(ASTContext *Context)
    : Visitor(Context) {}

  virtual void HandleTranslationUnit(clang::ASTContext &Context) {
    Visitor.TraverseDecl(Context.getTranslationUnitDecl());
  }
private:
  FindNamedClassVisitor Visitor;
};

class FindNamedClassAction : public clang::ASTFrontendAction {
public:
  virtual std::unique_ptr<ASTConsumer> CreateASTConsumer(
    clang::CompilerInstance &Compiler, llvm::StringRef InFile) {
    return std::unique_ptr<ASTConsumer>(new FindNamedClassConsumer(&Compiler.getASTContext()));
  }
};

int main(int argc, char **argv) {
  if (argc > 1) {
    clang::tooling::runToolOnCode(new FindNamedClassAction, argv[1]);
  }
}

Corresponding 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
)




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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