Error occur during linking.

[ZWindL]

OS: Archlinux With testing on and all up to date
llvm packages and version:

local/clang-compiler-rt-svn 7.0.0svn_r334049-1 (llvm-toolchain-svn)
    The "compiler-rt" set of runtime libraries for Clang and LLVM
local/clang-svn 7.0.0svn_r334049-1 (llvm-toolchain-svn)
    C language family frontend for LLVM
local/clang-tools-extra-svn 7.0.0svn_r334049-1 (llvm-toolchain-svn)
    Standalone tools for Clang: syntax checking, formatting, refactoring, etc.
local/lib32-llvm-libs 6.0.0-1
    Low Level Virtual Machine (runtime library)(32-bit)
local/lld-svn 7.0.0svn_r334049-1 (llvm-toolchain-svn)
    A linker from the LLVM project
local/llvm-libs-svn 7.0.0svn_r334049-1 (llvm-toolchain-svn)
    The LLVM Compiler Infrastructure (runtime libraries)
local/llvm-svn 7.0.0svn_r334049-1 (llvm-toolchain-svn)
    The LLVM Compiler Infrastructure

When I installing ccls-git from aur, the error below occurred.

[100%] Linking CXX executable ccls
/usr/bin/ld: 找不到 -lLLVM_LIBRARY-NOTFOUND
collect2: 错误：ld 返回 1
make[2]: *** [CMakeFiles/ccls.dir/build.make:964：ccls] 错误 1
make[1]: *** [CMakeFiles/Makefile2:68：CMakeFiles/ccls.dir/all] 错误 2
make: *** [Makefile:130：all] 错误 2

I don't know what to do now. :(

[Synray]

See #14, it's most likely a problem with Arch's clang.
Try building from source with this:

cmake -H. -Brelease -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_EXE_LINKER_FLAGS=-fuse-ld=lld -DCMAKE_EXPORT_COMPILE_COMMANDS=On

Worked for me and I'm also on Arch.
That will download clang binaries and use them. Make sure you have ninja installed from pacman.

[ZWindL]

@Synray Thanks, I will try it. btw. I know that issue, and I switched clang from clang to clang-svn from repo [clang-svn], the issue still exists. Hope Arch will fix this.

[ZWindL]

@Synray I tried to replace the build commands in ccls-git with the command from your comment cmake -H. -Bbuild -G Ninja -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_EXE_LINKER_FLAGS=-fuse-ld=lld -DCMAKE_EXPORT_COMPILE_COMMANDS=On, it reports

-- Build files have been written to: /home/zwindl/.cache/pacaur/ccls-git/src/ccls/build
[60/60] Linking CXX executable ccls
==> 正在进入 fakeroot 环境...
==> 正在开始 package()...
make: *** 没有规则可制作目标“install”。 停止。
==> 错误： 在 package() 中发生一个错误。
    正在放弃...

but it works fine when build from source code.

[Synray]

@ZWindL it might work to replace -G Ninja with -G "Unix Makefiles", I think because makepkg uses make internally.

[ZWindL]

@Synray Good, it works, though it has some conflict files, I'll try to figure that out.

[MaskRay]

You can also use the generic cmake --build release which invokes either make (Unix Makefiles) or ninja (Ninja) under the hood. (I use release/debug as the build directory name)

See also #21 , Arch Linux extra/clang 6.0.0-1 has issue with either libclang or some Clang C++ libraries. Does 7.0.0 work?

[ZWindL]

@MaskRay I will make a test on 7.0.0 these days. btw. The clang 7 package is not official build package, it's from third-party repository.

[ZWindL]

Same issue occurred when linking the project using clang 7 from repo llvm-svn

...
[100%] Linking CXX executable ccls
/usr/bin/ld: 找不到 -lLLVM_LIBRARY-NOTFOUND

[ZWindL]

It only occurred in the ccls-git packaging process, not appeared in the manually building process.

[MaskRay]

If -DUSE_SHARED_LLVM=on (see https://github.com/MaskRay/ccls/wiki/Build -DUSE_SHARED_LLVM=on) is used, you should find libLLVM.so in system library directories or CMAKE_PREFIX_PATH directories.

The bundled clang+llvm archives downloaded from releases.llvm.org contain libLLVMSupport.a libLLVMDemangle.a ... but not libLLVM.so

[ZWindL]

I see, seems the llvm-libs-svn package only contains a /usr/lib/libLLVM.so.7.0.0svn-r334657 -> libLLVM-7svn.so instead of libLLVM.so, maybe that's why the ccls-git couldn't find it.

Update:
Build with specified -DCMAKE_PREFIX_PATH=/usr/lib/libLLVM-7svn.so not work, and delete the option -DUSE_SHARED_LLVM=on it linked successfully (I don't know where cmake find the libLLVMSupport.a ...) but can't work with lsp, /tmp/LanguageServer.log reported

: CommandLine Error: Option 'non-global-value-max-name-size' registered more than once!
LLVM ERROR: inconsistency in registered CommandLine options

[MaskRay]

Can you try ln -s /usr/lib/libLLVM.so.7.0.0svn-r334657 /usr/local/lib/libLLVM.so and continue using -DUSE_SHARED_LLVM=on (basically -lLLVM)

[MaskRay]

#25 (comment)

[ZWindL]

It reports a different error

CMakeFiles/ccls.dir/src/clang_utils.cc.o：在函数‘FileName[abi:cxx11](void*)’中：
clang_utils.cc:(.text+0x322)：对‘clang_File_tryGetRealPathName’未定义的引用
collect2: 错误：ld 返回 1
make[2]: *** [CMakeFiles/ccls.dir/build.make:954：ccls] 错误 1
make[1]: *** [CMakeFiles/Makefile2:68：CMakeFiles/ccls.dir/all] 错误 2
make: *** [Makefile:130：all] 错误 2

[MaskRay]

clang_File_tryGetRealPathName is no longer used, along with all other libclang functions. Can you check if llvm-libs-svn works now?