[llvm-dev] Linker errors after installing/compiling LLVM/CLANG

[Neil Nelson via llvm-dev]

John, I compiled and installed to /usr/local all the projects under llvm 
except llgo yesterday. The three files you noted are in

../llvm-project/build/lib

I do not have a llvm-project/build/Debug directory.

Xubuntu 19.04. llvm downloaded from github on 6/18 using instructions 
from the page you note.

cmake -G Ninja 
-DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;compiler-rt;debuginfo-tests;libclc;libcxx;libcxxabi;libunwind;lld;lldb;llvm;openmp;parallel-libs;polly;pstl" 
-DLLVM_USE_LINKER=lld -DCMAKE_BUILD_TYPE="Release" ../llvm

Installed additional packages as needed.

Neil

On 7/5/19 6:46 AM, Joan Lluch via llvm-dev wrote:
> Hi All,
>
> I am looking for the best way to install LLVM+clang,  but I do not 
> seem to find a way that works for me.
>
> I followed the steps in this document Getting Started with the LLVM 
> System — LLVM 9 documentation 
> <https://llvm.org/docs/GettingStarted.html> except that I created the 
> following folder structure as I do not want clang and llc to go to 
> /usr/local
>
> LLVM-9
>    llvm-project  (cloned from github)
>    install
>
> I ran the following command line from the build directory in 
> llvm-project as described in the doc, but added the 
> DLLVM_OPTIMIZED_TABLEGEN=On variable :
>
> cmake -G Xcode -DLLVM_ENABLE_PROJECTS=clang 
> -DCMAKE_INSTALL_PREFIX=/Users/joan/LLVM-9/install 
> -DLLVM_OPTIMIZED_TABLEGEN=On ../llvm
>
> The cmake command above seems to work ok, but after that, when I 
> compile the “install” or “build_all” schemes I get a lot of linker 
> errors. Such as these ones and more:
>
> clang: error: no such file or directory: 
> '/Users/joan/LLVM-9/llvm-project/build/Debug/lib/libclangAST.a'
> clang: error: no such file or directory: 
> '/Users/joan/LLVM-9/llvm-project/build/Debug/lib/libclangLex.a'
> clang: error: no such file or directory: 
> '/Users/joan/LLVM-9/llvm-project/build/Debug/lib/libclangBasic.a'
>
> Up until recently, I have worked with LLVM 7.0 and all what I did was 
> downloading both llvm and clang from llvm.org <http://llvm.org>, 
> copied clang into llvm/tools, and ran the cmake application (not 
> command line).  That kind of worked except for some minor glitches but 
> of course I didn’t get the benefits of git.
>
> So what am I doing wrong now? Why I’m getting such linker errors?
>
> It seems that a few required libraries are not created, but I do not 
> understand why. Any ideas?
>
> Thanks,
>
> John
>
>
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