Failed to build clang from source

Attempting to build clang in Ubuntu 19.04 environment fails.
Why?
I am trying to build the C/C++ toolchain from 1.
glibc, libc++, libc++abi, llvm seem to have been able to build.

I'm trying to build it by running cmake as follows, but it doesn't work and I get an error similar to the one below.

The undefined reference llvm::cl::ParseCommandLineOptions(int,char const*const*,llvm::StringRef,llvm::raw_ostream*,char const*) is also an error in /home/yuya/opt/lib/libLLVMSupport.a/cmLAake. Why?

/home/username/opt is the directory specified in INSTALL_PREFIX, where glibc, libc++abi, libc++, llvm are installed.

`additional:`

I think it's wrong to pass CMAKE_CXX(C)_FLAGS -L to indicate the location of the library and -l to indicate the name of the library. How do I pass CMAKE to the compiler?

`Additional 2:`

It seems wrong to pass the library location and name to CMAKE_CXX(C)_FLAGS. It seems that it is correct to give it to DCMAKE_SHARED_LINKER_FLAGS. I tried cmake2, but the error still occurs.

Error:

/usr/bin/ld:CMakeFiles/obj.clang-tblgen.dir/TableGen.cpp.o:in function `main':
/home/username/src/llvm-project/clang/utils/TableGen/TableGen.cpp:306: undefined reference to `llvm::cl::ParseCommandLineOptions(int,char const*const*,llvm:::StringRef,llvm:::raw_ostream,*)
collect2:error:ld returned1 exit status

cmake:

cmake-G "Unix Makefiles"\
    - DCMAKE_BUILD_TYPE = RelWithDebInfo\
    - DCMAKE_INSTALL_PREFIX="/home/username/clang_test_opt"\
    -DCMAKE_C_FLAGS="-I/home/username/opt/include\
    - I/home/username/src/llvm-project/include\
    - I/home/username/src/llvm-project/llvm/include\
    -L/home/username/opt/lib\
    -lLLVMSupport"\
    -DCMAKE_CXX_FLAGS="-I/home/username/opt/include\
        - I/home/username/src/llvm-project/clang/include\
        - I/home/username/src/llvm-project/llvm/include\
        -L/home/username/opt/lib\
        -lLLVMSupport"\
    -DLLVM_TABLEGEN_EXE="/home/username/opt/bin/llvm-tblgen"\
    -DLLVM_LIBRARY_DIR="/home/username/llvm-project/llvm/lib"\
    -DLLVM_TOOLS_BINARY_DIR="/home/username/opt/bin"\
    -DLLVM_MAIN_INCLUDE_DIR="/home/username/src/llvm-project/llvm/include"\
    - DLLVM_DIR="/home/username/src/llvm-project/llvm/cmake"\
    .../llvm-project/clang

cmake2:

cmake-G "Unix Makefiles"\
    - DCMAKE_BUILD_TYPE = RelWithDebInfo\
    - DCMAKE_INSTALL_PREFIX=/home/username/clang_test_opt\
    -DCMAKE_C_FLAGS="-I/home/username/opt/include\
        - I/home/username/src/llvm-project/include\
        - I/home/username/src/llvm-project/llvm/include"\
    -DCMAKE_CXX_FLAGS="-I/home/username/opt/include\
        - I/home/username/src/llvm-project/clang/include\
        - I/home/username/src/llvm-project/llvm/include"\
    -DCMAKE_SHARED_LINKER_FLAGS="-L/home/username/opt/lib\
        -lLLVMSupport"\
    -DLLVM_TABLEGEN_EXE=/home/username/opt/bin/llvm-tblgen\
    -DLLVM_LIBRARY_DIR=/home/username/llvm-project/llvm/lib\
    -DLLVM_TOOLS_BINARY_DIR=/home/username/opt/bin\
    -DLLVM_MAIN_INCLUDE_DIR=/home/username/src/llvm-project/llvm/include\
    - DLLVM_DIR=/home/username/src/llvm-project/llvm/cmake\
    -DZ3_LIBRARIES=/home/username/opt/lib\
    -DZ3_INCLUDE_DIR=/home/username/opt/include\
    .../llvm-project/clang


c++
build
cmake
llvm
					
					

	


		
	

	
		2022-09-30 21:43



			

			
			1 Answers


	
		
It does not answer the direct question of the person who asked the question, but 

Failed to build from source.It took a little over 10 hours in this environment.
[clang] 
10.0.0 (trunc372494)
[Build source] 
 svnco http://llvm.org/svn/llvm-project/llvm/trunk llvm
svnco http://llvm.org/svn/llvm-project/cfe/trunk clang
svnco http://llvm.org/svn/llvm-project/clang-tools-extra/trunk extra
svnco http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
[Build Environment] 

WSL
Ubuntu 18.04.3 LTS (Bionic Beaver) 
cmake 3.10.2
gcc7.4.0
ld2.30
make 4.1
python 2.7.15+
[Reference Page] 
[November 2018] Compile/build compiler-based LLVM+Clang from scratch (AWS+CentOS7). -Qiita 
Replace the procedure because the environment is different (*) It is necessary, but it was almost unmodified and the build went well.(*Use apt instead of yum) 


		
		
			

				

					
				

				
					2022-09-30 21:43
				
			
		
	
			
			If you have any answers or tips



		

	
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