[cfe-dev] Howto build clang tools using cmake

[Manuel Klimek]

The most awesomest way would be to send a patch for the docs :D otherwise
this is the right venue. Thanks for reporting!
On Jul 22, 2014 2:08 AM, "Anwar Ludin" <anwar.ludin at gmail.com> wrote:

> 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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>> cfe-dev at cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>>
>
>
>
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