[cfe-dev] Undefined symbols for architecture x86_64 when compile newFrontendActionFactory with clang 5.0.

[John McCall via cfe-dev]

> On Sep 5, 2017, at 5:04 AM, 彬杰 via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> 
> My Code is : 
> ===============================================================================================
> void *threadRun(void *arg)
> {
>     struct threadParam *param = (struct threadParam *) arg;
>     ClangTool clangTool(*param->cdb, *param->taskList);
>     pthread_mutex_lock(&Global::actionMutex);
>     unique_ptr<FrontendActionFactory> factory = newFrontendActionFactory<GodEyesFrontendAction>(); // Error happens here
>     ToolAction* action;
>     if (factory != NULL) {
>         action = factory.get();
>     }
>     pthread_mutex_unlock(&Global::actionMutex);
>     if (factory != NULL) {
>         clangTool.run(action);
>     
>     }
>     return (void*)1;
> }
> ===============================================================================================
> it can compile and link well in clang 3.7, but when I upgrade clang to 5.0 ,  it link fails.  I don't know what's wrong with this;
> Please help me out here.Any idea will be appreciated! thanks!!!
> 
> ERROR Message :  
> ===============================================================================================
> Undefined symbols for architecture x86_64:   
>     "typeinfo for clang::ASTConsumer", referenced from:   
>     typeinfo for GodEyesASTConsumer in GodEyes.cpp.o   
>     "typeinfo for clang::ASTFrontendAction", referenced from:   
>     typeinfo for GodEyesFrontendAction in GodEyes.cpp.o   
>     "typeinfo for clang::tooling::FrontendActionFactory", referenced from:   
>     typeinfo for std::__1::unique_ptr<clang::tooling::FrontendActionFactory, std::__1::default_delete<clang::tooling::FrontendActionFactory> >   clang::tooling::newFrontendActionFactory<GodEyesFrontendAction>  ()::SimpleFrontendActionFactory in GodEyes.cpp.o   
> ld: symbol(s) not found for architecture x86_64   
> clang: error: linker command failed with exit code 1 (use -v to see invocation)   
> ninja: build stopped: subcommand failed.   
> =============================================================================================== 
> 
> 
> My CMakeLists.txt is as below: 
> ===============================================================================================
> cmake_minimum_required (VERSION 2.8) 
> 
> project(main)   
> set(main_VERSION 3.1)   
> 
> configure_file (   
>   "${PROJECT_SOURCE_DIR}/config.h.in"   
>   "${PROJECT_SOURCE_DIR}/config.h"   
>   )   
> 
> set(CMAKE_C_COMPILER "/usr/bin/clang")   
> set(CMAKE_CXX_COMPILER "/usr/bin/clang++")   
> set(CMAKE_AR "/usr/bin/llvm-ar")   
> set(CMAKE_LINKER "/usr/bin/llvm-ld")   
> set(CMAKE_NM "/usr/bin/llvm-nm")   
> set(CMAKE_OBJDUMP "/usr/bin/llvm-objdump")   
> set(CMAKE_RANLIB "/usr/bin/llvm-ranlib")   
> set(CLANG_ROOT "/Users/baixx/clang-llvm/build/lib/clang/3.9.0/include")   
> set(LLVM_LINK_COMPONENTS support)   
> set(LLVM_USED_LIBS clangTooling clangBasic clangAST)   

Looks like you need to be linking against clangFrontend.

John.

> 
> set(CMAKE_BUILD_TYPE "Release")   
> set(CMAKE_CXX_FLAGS_DEBUG "$ENV{CXXFLAGS} -O0 -Wall -g -ggdb")   
> set(CMAKE_CXX_FLAGS_RELEASE "$ENV{CXXFLAGS} -O3 -Wall -DCMAKE_OSX_ARCHITECTURES=x86_64")   
> 
> aux_source_directory(. DIR_SRCS)   
> aux_source_directory(rules RULE_SRCS)   
> add_executable (main-core ${DIR_SRCS} ${RULE_SRCS})   
> target_link_libraries(main-core clangTooling curl) 
> =========================================================================================== 
> 
> Please help me out here.Any idea will be appreciated! thanks!!! 
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