Bug#735592: llvm-3.5-dev: LLVM/Clang CMake package files missing

[Ulf Wetzker]

On 06/03/2014 01:49 PM, Sylvestre Ledru wrote:
> The files contain bad internal filenames.  For example, if you try to build
> an LLVM pass according to the LLVM instructions
> http://llvm.org/docs/CMake.html#cmake-out-of-source-pass
> it will give the error
> 
> CMake Error at /usr/share/llvm-3.5/cmake/LLVMConfig.cmake:43 (include):
> >   include could not find load file:
> >
> >     /usr/lib/llvm-3.5/share/llvm/cmake/LLVMExports.cmake
> >
> 
> where we can see it is looking in the folder
> /usr/lib/llvm-3.5/share/llvm/cmake/, instead of /usr/share/llvm-3.5/cmake/
> where the file LLVMExports.cmake is actually located.

In LLVMConfig.cmake the variable ${LLVM_CMAKE_DIR} is set to 
/usr/lib/llvm-3.5/share/llvm/cmake. While trying to include 
LLVMExports.cmake from ${LLVM_CMAKE_DIR} this error it thrown since 
LLVMConfig.cmake and LLVMExports.cmake are both located in 
/usr/share/llvm-3.5/cmake/

I fixed this by looking for the include files relative to the config file.
include("${CMAKE_CURRENT_LIST_DIR}/LLVMExports.cmake")

I think this patch will fix the the error caused by calling
find_package(LLVM REQUIRED CONFIG)

Ulf
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