CMake script does not take Clang compiler variables properly

[sanaris]

When compiling with clang-10, llvm-10 paths all set. Even correcting path for LLD does not help to get successive build.

zig-build.txt

with 'make -d' running

Putting child 0x55b32b5336d0 (zig0) PID 12040 on the chain.
Live child 0x55b32b5336d0 (zig0) PID 12040
[ 98%] Linking CXX executable zig0
Reaping winning child 0x55b32b5336d0 PID 12040
Live child 0x55b32b5336d0 (zig0) PID 12042
zig_cpp/libzig_cpp.a(zig_clang_cc1_main.cpp.o): In function cc1_main(llvm::ArrayRef<char const*>, char const*, void*)': /home/san/zig-master/src/zig_clang_cc1_main.cpp:187: undefined reference to clang::CompilerInstance::CompilerInstance(std::shared_ptrclang::PCHContainerOperations, clang::InMemoryModuleCache*)'
/home/san/zig-master/src/zig_clang_cc1_main.cpp:188: undefined reference to clang::DiagnosticIDs::DiagnosticIDs()' /home/san/zig-master/src/zig_clang_cc1_main.cpp:205: undefined reference to clang::DiagnosticsEngine::DiagnosticsEngine(llvm::IntrusiveRefCntPtrclang::DiagnosticIDs, llvm::IntrusiveRefCntPtrclang::DiagnosticOptions, clang::DiagnosticConsumer*, bool)'
/home/san/zig-master/src/zig_clang_cc1_main.cpp:207: undefined reference to clang::CompilerInvocation::CreateFromArgs(clang::CompilerInvocation&, llvm::ArrayRef<char const*>, clang::DiagnosticsEngine&)' /home/san/zig-master/src/zig_clang_cc1_main.cpp:221: undefined reference to clang::CompilerInvocation::GetResourcesPath[abi:cxx11](char const*, void*)'
/home/san/zig-master/src/zig_clang_cc1_main.cpp:224: undefined reference to clang::CompilerInstance::createDiagnostics(clang::DiagnosticConsumer*, bool)' /home/san/zig-master/src/zig_clang_cc1_main.cpp:233: undefined reference to clang::TextDiagnosticBuffer::FlushDiagnostics(clang::DiagnosticsEngine&) const'
/home/san/zig-master/src/zig_clang_cc1_main.cpp:240: undefined reference to clang::ExecuteCompilerInvocation(clang::CompilerInstance*)' /home/san/zig-master/src/zig_clang_cc1_main.cpp:252: undefined reference to clang::CompilerInstance::createOutputFile(llvm::StringRef, bool, bool, llvm::StringRef, llvm::StringRef, bool, bool)'
/home/san/zig-master/src/zig_clang_cc1_main.cpp:277: undefined reference to clang::DiagnosticsEngine::~DiagnosticsEngine()' zig_cpp/libzig_cpp.a(zig_clang_cc1_main.cpp.o): In function TextDiagnosticBuffer':
/usr/lib/llvm-10/include/clang/Frontend/TextDiagnosticBuffer.h:25: undefined reference to vtable for clang::TextDiagnosticBuffer' zig_cpp/libzig_cpp.a(zig_clang_cc1_main.cpp.o): In function void __gnu_cxx::new_allocatorclang::PCHContainerOperations::constructclang::PCHContainerOperations(clang::PCHContainerOperations*)':
/usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/ext/new_allocator.h:136: undefined reference to clang::PCHContainerOperations::PCHContainerOperations()' zig_cpp/libzig_cpp.a(zig_clang_cc1_main.cpp.o): In function ObjectFilePCHContainerWriter':
/usr/lib/llvm-10/include/clang/CodeGen/ObjectFilePCHContainerOperations.h:18: undefined reference to vtable for clang::ObjectFilePCHContainerWriter' zig_cpp/libzig_cpp.a(zig_clang_cc1_main.cpp.o): In function ObjectFilePCHContainerReader':
/usr/lib/llvm-10/include/clang/CodeGen/ObjectFilePCHContainerOperations.h:34: undefined reference to vtable for clang::ObjectFilePCHContainerReader' zig_cpp/libzig_cpp.a(zig_clang_driver.cpp.o): In function ZigClang_main':
/home/san/zig-master/src/zig_clang_driver.cpp:338: undefined reference to clang::noteBottomOfStack()' /home/san/zig-master/src/zig_clang_driver.cpp:347: undefined reference to clang::driver::ToolChain::getTargetAndModeFromProgramName(llvm::StringRef)'
/home/san/zig-master/src/zig_clang_driver.cpp:458: undefined reference to clang::TextDiagnosticPrinter::TextDiagnosticPrinter(llvm::raw_ostream&, clang::DiagnosticOptions*, bool)' /home/san/zig-master/src/zig_clang_driver.cpp:461: undefined reference to clang::DiagnosticIDs::DiagnosticIDs()'
/home/san/zig-master/src/zig_clang_driver.cpp:463: undefined reference to clang::DiagnosticsEngine::DiagnosticsEngine(llvm::IntrusiveRefCntPtr<clang::DiagnosticIDs>, llvm::IntrusiveRefCntPtr<clang::DiagnosticOptions>, clang::DiagnosticConsumer*, bool)' /home/san/zig-master/src/zig_clang_driver.cpp:467: undefined reference to clang::serialized_diags::create(llvm::StringRef, clang::DiagnosticOptions*, bool)'
/home/san/zig-master/src/zig_clang_driver.cpp:469: undefined reference to clang::DiagnosticsEngine::setClient(clang::DiagnosticConsumer*, bool)' /home/san/zig-master/src/zig_clang_driver.cpp:473: undefined reference to clang::ProcessWarningOptions(clang::DiagnosticsEngine&, clang::DiagnosticOptions const&, bool)'
/home/san/zig-master/src/zig_clang_driver.cpp:475: undefined reference to clang::driver::Driver::Driver(llvm::StringRef, llvm::StringRef, clang::DiagnosticsEngine&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>)' /home/san/zig-master/src/zig_clang_driver.cpp:489: undefined reference to clang::driver::Driver::BuildCompilation(llvm::ArrayRef<char const*>)'
/home/san/zig-master/src/zig_clang_driver.cpp:493: undefined reference to clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&)' /home/san/zig-master/src/zig_clang_driver.cpp:522: undefined reference to clang::driver::Driver::generateCompilationDiagnostics(clang::driver::Compilation&, clang::driver::Command const&, llvm::StringRef, clang::driver::Driver::CompilationDiagnosticReport*)'
/home/san/zig-master/src/zig_clang_driver.cpp:546: undefined reference to clang::DiagnosticsEngine::~DiagnosticsEngine()' zig_cpp/libzig_cpp.a(zig_clang_driver.cpp.o): In function CreateAndPopulateDiagOpts(llvm::ArrayRef<char const*>, bool&)':
/home/san/zig-master/src/zig_clang_driver.cpp:275: undefined reference to clang::driver::getDriverOptTable()' /home/san/zig-master/src/zig_clang_driver.cpp:280: undefined reference to clang::ParseDiagnosticArgs(clang::DiagnosticOptions&, llvm::opt::ArgList&, clang::DiagnosticsEngine*, bool, bool)'
zig_cpp/libzig_cpp.a(zig_clang_driver.cpp.o): In function ChainedDiagnosticConsumer': /usr/lib/llvm-10/include/clang/Frontend/ChainedDiagnosticConsumer.h:29: undefined reference to vtable for clang::ChainedDiagnosticConsumer'
zig_cpp/libzig_cpp.a(zig_clang_driver.cpp.o): In function DiagnosticConsumer': /usr/lib/llvm-10/include/clang/Basic/Diagnostic.h:1505: undefined reference to vtable for clang::DiagnosticConsumer'
zig_cpp/libzig_cpp.a(zig_clang_driver.cpp.o): In function clang::DiagnosticBuilder::Emit()': /usr/lib/llvm-10/include/clang/Basic/Diagnostic.h:1112: undefined reference to clang::DiagnosticsEngine::EmitCurrentDiagnostic(bool)'
zig_cpp/libzig_cpp.a(zig_clang_driver.cpp.o): In function llvm::RefCountedBase<clang::DiagnosticIDs>::Release() const': /usr/lib/llvm-10/include/llvm/ADT/IntrusiveRefCntPtr.h:82: undefined reference to clang::DiagnosticIDs::~DiagnosticIDs()'
zig_cpp/libzig_cpp.a(zig_clang_driver.cpp.o): In function std::default_delete<clang::driver::Compilation>::operator()(clang::driver::Compilation*) const': /usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/unique_ptr.h:78: undefined reference to clang::driver::Compilation::~Compilation()'
zig_cpp/libzig_cpp.a(zig_clang_cc1as_main.cpp.o): In function cc1as_main(llvm::ArrayRef<char const*>, char const*, void*)': /home/san/zig-master/src/zig_clang_cc1as_main.cpp:563: undefined reference to clang::TextDiagnosticPrinter::TextDiagnosticPrinter(llvm::raw_ostream&, clang::DiagnosticOptions*, bool)'
/home/san/zig-master/src/zig_clang_cc1as_main.cpp:565: undefined reference to clang::DiagnosticIDs::DiagnosticIDs()' /home/san/zig-master/src/zig_clang_cc1as_main.cpp:566: undefined reference to clang::DiagnosticsEngine::DiagnosticsEngine(llvm::IntrusiveRefCntPtrclang::DiagnosticIDs, llvm::IntrusiveRefCntPtrclang::DiagnosticOptions, clang::DiagnosticConsumer*, bool)'
/home/san/zig-master/src/zig_clang_cc1as_main.cpp:579: undefined reference to clang::driver::getDriverOptTable()' /home/san/zig-master/src/zig_clang_cc1as_main.cpp:617: undefined reference to clang::DiagnosticsEngine::~DiagnosticsEngine()'
zig_cpp/libzig_cpp.a(zig_clang_cc1as_main.cpp.o): In function (anonymous namespace)::AssemblerInvocation::CreateFromArgs((anonymous namespace)::AssemblerInvocation&, llvm::ArrayRef<char const*>, clang::DiagnosticsEngine&)': /home/san/zig-master/src/zig_clang_cc1as_main.cpp:180: undefined reference to clang::driver::getDriverOptTable()'
zig_cpp/libzig_cpp.a(zig_clang_cc1as_main.cpp.o): In function clang::getLastArgIntValue(llvm::opt::ArgList const&, llvm::opt::OptSpecifier, int, clang::DiagnosticsEngine&, unsigned int)': /usr/lib/llvm-10/include/clang/Driver/OptionUtils.h:40: undefined reference to clang::getLastArgIntValue(llvm::opt::ArgList const&, llvm::opt::OptSpecifier, int, clang::DiagnosticsEngine*, unsigned int)'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Reaping losing child 0x55b32b5336d0 PID 12042
CMakeFiles/zig0.dir/build.make:134: recipe for target 'zig0' failed
make[3]: *** [zig0] Error 1
Removing child 0x55b32b5336d0 PID 12042 from chain.
Reaping losing child 0x55b8d49bb900 PID 12039
CMakeFiles/Makefile2:261: recipe for target 'CMakeFiles/zig0.dir/all' failed
make[2]: *** [CMakeFiles/zig0.dir/all] Error 2
Removing child 0x55b8d49bb900 PID 12039 from chain.
Reaping losing child 0x557f686f6d30 PID 12010
CMakeFiles/Makefile2:273: recipe for target 'CMakeFiles/zig0.dir/rule' failed
make[1]: *** [CMakeFiles/zig0.dir/rule] Error 2
Removing child 0x557f686f6d30 PID 12010 from chain.
Reaping losing child 0x56131eb19fa0 PID 12007
Makefile:229: recipe for target 'zig0' failed
make: *** [zig0] Error 2
Removing child 0x56131eb19fa0 PID 12007 from chain.

As you can see, something bugged and instead of following only Clang environment it started walking around GCC in the system, which ofc has different version from Clang and when it tried to link against GCC it was not able to do it. Link against Clang instead!

########################

EXTERNAL cache entries

########################

//Path to a file.
CLANG_INCLUDE_DIRS:PATH=/usr/include/clang/10/include

//No help, variable specified on the command line.
CLANG_LIBRARIES:UNINITIALIZED=/usr/lib/clang/10/

//Path to a program.
CMAKE_AR:FILEPATH=/usr/bin/ar

//Choose the type of build, options are: None Debug Release RelWithDebInfo
// MinSizeRel.
CMAKE_BUILD_TYPE:STRING=Debug

//Enable/Disable color output during build.
CMAKE_COLOR_MAKEFILE:BOOL=ON

//CXX compiler
CMAKE_CXX_COMPILER:FILEPATH=/usr/bin/clang++-10

//LLVM archiver
CMAKE_CXX_COMPILER_AR:FILEPATH=/usr/lib/llvm-10/bin/llvm-ar

//Generate index for LLVM archive
CMAKE_CXX_COMPILER_RANLIB:FILEPATH=/usr/lib/llvm-10/bin/llvm-ranlib

//Flags used by the compiler during all build types.
CMAKE_CXX_FLAGS:STRING=

//Flags used by the compiler during debug builds.
CMAKE_CXX_FLAGS_DEBUG:STRING=-g

//Flags used by the compiler during release builds for minimum
// size.
CMAKE_CXX_FLAGS_MINSIZEREL:STRING=-Os -DNDEBUG

//Flags used by the compiler during release builds.
CMAKE_CXX_FLAGS_RELEASE:STRING=-O3 -DNDEBUG

//Flags used by the compiler during release builds with debug info.
CMAKE_CXX_FLAGS_RELWITHDEBINFO:STRING=-O2 -g -DNDEBUG

//C compiler
CMAKE_C_COMPILER:FILEPATH=/usr/bin/clang-10

//LLVM archiver
CMAKE_C_COMPILER_AR:FILEPATH=/usr/lib/llvm-10/bin/llvm-ar

//Generate index for LLVM archive
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//Flags used by the compiler during all build types.
CMAKE_C_FLAGS:STRING=

//Flags used by the compiler during debug builds.
CMAKE_C_FLAGS_DEBUG:STRING=-g

//Flags used by the compiler during release builds for minimum
// size.
CMAKE_C_FLAGS_MINSIZEREL:STRING=-Os -DNDEBUG

//Flags used by the compiler during release builds.
CMAKE_C_FLAGS_RELEASE:STRING=-O3 -DNDEBUG

//Flags used by the compiler during release builds with debug info.
CMAKE_C_FLAGS_RELWITHDEBINFO:STRING=-O2 -g -DNDEBUG

//Flags used by the linker.
CMAKE_EXE_LINKER_FLAGS:STRING=

//Flags used by the linker during debug builds.
CMAKE_EXE_LINKER_FLAGS_DEBUG:STRING=

//Flags used by the linker during release minsize builds.
CMAKE_EXE_LINKER_FLAGS_MINSIZEREL:STRING=

//Flags used by the linker during release builds.
CMAKE_EXE_LINKER_FLAGS_RELEASE:STRING=

//Flags used by the linker during Release with Debug Info builds.
CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO:STRING=

//Enable/Disable output of compile commands during generation.
CMAKE_EXPORT_COMPILE_COMMANDS:BOOL=OFF

//Directory to install zig to
CMAKE_INSTALL_PREFIX:STRING=/home/san/zig-master/build

//Path to a program.
CMAKE_LINKER:FILEPATH=/usr/bin/ld.lld-10

//Path to a program.
CMAKE_MAKE_PROGRAM:FILEPATH=/usr/bin/make

//Flags used by the linker during the creation of modules.
CMAKE_MODULE_LINKER_FLAGS:STRING=

//Flags used by the linker during debug builds.
CMAKE_MODULE_LINKER_FLAGS_DEBUG:STRING=

//Flags used by the linker during release minsize builds.
CMAKE_MODULE_LINKER_FLAGS_MINSIZEREL:STRING=

//Flags used by the linker during release builds.
CMAKE_MODULE_LINKER_FLAGS_RELEASE:STRING=

//Flags used by the linker during Release with Debug Info builds.
CMAKE_MODULE_LINKER_FLAGS_RELWITHDEBINFO:STRING=

//Path to a program.
CMAKE_NM:FILEPATH=/usr/bin/nm

//Path to a program.
CMAKE_OBJCOPY:FILEPATH=/usr/bin/objcopy

//Path to a program.
CMAKE_OBJDUMP:FILEPATH=/usr/bin/objdump

//Value Computed by CMake
CMAKE_PROJECT_NAME:STATIC=zig

//Path to a program.
CMAKE_RANLIB:FILEPATH=/usr/bin/ranlib

//Flags used by the linker during the creation of dll's.
CMAKE_SHARED_LINKER_FLAGS:STRING=

//Flags used by the linker during debug builds.
CMAKE_SHARED_LINKER_FLAGS_DEBUG:STRING=

//Flags used by the linker during release minsize builds.
CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL:STRING=

//Flags used by the linker during release builds.
CMAKE_SHARED_LINKER_FLAGS_RELEASE:STRING=

//Flags used by the linker during Release with Debug Info builds.
CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO:STRING=

//If set, runtime paths are not added when installing shared libraries,
// but are added when building.
CMAKE_SKIP_INSTALL_RPATH:BOOL=NO

//If set, runtime paths are not added when using shared libraries.
CMAKE_SKIP_RPATH:BOOL=NO

//Flags used by the linker during the creation of static libraries.
CMAKE_STATIC_LINKER_FLAGS:STRING=

//Flags used by the linker during debug builds.
CMAKE_STATIC_LINKER_FLAGS_DEBUG:STRING=

//Flags used by the linker during release minsize builds.
CMAKE_STATIC_LINKER_FLAGS_MINSIZEREL:STRING=

//Flags used by the linker during release builds.
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CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO:STRING=

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LLD_INCLUDE_DIRS:PATH=/usr/lib/llvm-10/include

//Path to a library.
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//Path to a library.
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//Path to a library.
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//Path to a library.
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LLD_LLDMINGW_LIB:FILEPATH=/usr/lib/llvm-10/lib/liblldMinGW.a

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//Dependencies for the target
zigcompiler_LIB_DEPENDS:STATIC=general;zig_cpp;general;opt_c_util;general;embedded_softfloat;general;-lpthread;

[sanaris]

~/zig-master/build$ cmake --version
cmake version 3.10.2

CMake suite maintained and supported by Kitware (kitware.com/cmake).
/zig-master/build$ gcc --version
gcc (Ubuntu 7.5.0-3ubuntu118.04) 7.5.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

/zig-master/build$ clang --version
clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
/zig-master/build$ clang-10 --version
clang version 10.0.0-1oibafb
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

[sanaris]

Running with

cmake .. -DCMAKE_C_COMPILER=/usr/bin/clang-10 -DCMAKE_CXX_COMPILER=/usr/bin/clang++-10 -DCMAKE_NM=/usr/bin/llvm-nm-10 -DCMAKE_RANLIB=/usr/bin/llvm-ranlib-10 -DCMAKE_LINKER=/usr/bin/llvm-link-10 -DCMAKE_AR=/usr/bin/llvm-ar-10

I reduced linker problems to

[ 99%] Linking CXX executable zig0
/usr/lib/llvm-10/bin/../lib/libclangCodeGen.a(BackendUtil.cpp.o): In function (anonymous namespace)::EmitAssemblyHelper::EmitAssemblyWithNewPassManager(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream> >)': BackendUtil.cpp:(.text._ZN12_GLOBAL__N_118EmitAssemblyHelper30EmitAssemblyWithNewPassManagerEN5clang13BackendActionESt10unique_ptrIN4llvm17raw_pwrite_streamESt14default_deleteIS5_EE+0x1f25): undefined reference to getPollyPluginInfo()'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
CMakeFiles/zig0.dir/build.make:163: recipe for target 'zig0' failed
make[2]: *** [zig0] Error 1
CMakeFiles/Makefile2:261: recipe for target 'CMakeFiles/zig0.dir/all' failed
make[1]: *** [CMakeFiles/zig0.dir/all] Error 2
Makefile:129: recipe for target 'all' failed
make: *** [all] Error 2

[andrewrk]

Duplicate of pinned issue #4799