[llvm-dev] LLVM_CONFIG_PATH when building Clang from sources

[Tom Stellard via llvm-dev]

On 11/15/2018 09:39 PM, Jeffrey Walton via llvm-dev wrote:
> I'm trying to build LLVM, CFE and RT from sources on an old PowerMac
> with OS X 10.5.
> 

Which version of clang/llvm are you using?

-Tom

> After download and unpack into LLVM_SOURCE_DIR (with
> --strip-components=1), I configure with:
> 
>     cmake -DCMAKE_INSTALL_PREFIX="/opt/llvm" \
>         -DLLVM_TARGETS_TO_BUILD="PowerPC" \
>         -DLLVM_INCLUDE_TOOLS="ON" \
>         -DLLVM_BUILD_TESTS="ON"
>         "$LLVM_SOURCE_DIR"
> 
> It results in "llvm-config not found: specify LLVM_CONFIG_PATH". The
> docs at https://llvm.org/docs/CMake.html don't appear to discuss
> LLVM_CONFIG_PATH.
> 
> I'm building out-of-tree with these two variables:
> 
>     LLVM_SOURCE_DIR="$HOME/llvm_source"
>     LLVM_BUILD_DIR="$HOME/llvm_build"
> 
> How should I fix the LLVM_CONFIG_PATH error?
> 
> Thanks in advance.
> 
> ==============================
> 
> -- The C compiler identification is GNU 4.0.1
> -- The CXX compiler identification is GNU 4.0.1
> -- The ASM compiler identification is GNU
> -- Found assembler: /Developer/usr/bin/cc
> -- Checking whether C compiler has -isysroot
> -- Checking whether C compiler has -isysroot - yes
> -- Checking whether C compiler supports OSX deployment target flag
> -- Checking whether C compiler supports OSX deployment target flag - yes
> -- Check for working C compiler: /Developer/usr/bin/cc
> -- Check for working C compiler: /Developer/usr/bin/cc -- works
> -- Detecting C compiler ABI info
> -- Detecting C compiler ABI info - done
> -- Detecting C compile features
> -- Detecting C compile features - done
> -- Checking whether CXX compiler has -isysroot
> -- Checking whether CXX compiler has -isysroot - yes
> -- Checking whether CXX compiler supports OSX deployment target flag
> -- Checking whether CXX compiler supports OSX deployment target flag - yes
> -- Check for working CXX compiler: /Developer/usr/bin/c++
> -- Check for working CXX compiler: /Developer/usr/bin/c++ -- works
> -- Detecting CXX compiler ABI info
> -- Detecting CXX compiler ABI info - done
> -- Detecting CXX compile features
> -- Detecting CXX compile features - done
> -- Looking for unwind.h
> -- Looking for unwind.h - found
> CMake Error at cmake/Modules/CompilerRTUtils.cmake:213 (message):
>   llvm-config not found: specify LLVM_CONFIG_PATH
> Call Stack (most recent call first):
>   CMakeLists.txt:66 (load_llvm_config)
> 
> -- Configuring incomplete, errors occurred!
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