FindBoost with MSVS and LLVM Toolset
Hello!
I got a problem while trying to use CMake 3.11.3 to configure a project that uses Boost.Exception library and LLVM-vs2014 toolset with MSVS 2017 v15.7.4.
I configure the project using cmake-gui. I select the Visual Studio 15 2017 generator and set optional toolset option to LLVM-vs2014. I have LLVM 6.0 x64 installed.
CMakeLists.txt:
# Boost settings
if (WIN32)
# According to documentation:
#
# On Visual Studio and Borland compilers Boost headers request automatically
# linking to corresponding libraries. This requires matching libraries to be
# linked explicitly or available in the link library search path. In this case
# setting Boost_USE_STATIC_LIBS to OFF may not achieve dynamic linking. Boost
# automatic linking typically requests static libraries with a few exceptions
# (such as Boost.Python).
#
# That's why for static libraries it is required to explicitly enable static
# libraries usage.
set (Boost_USE_STATIC_LIBS ON)
endif (WIN32)
find_package (Boost 1.38.0 REQUIRED
COMPONENTS
exception)
Error message:
CMake Error at C:/Program Files/CMake/share/cmake-3.11/Modules/FindBoost.cmake:2044 (message):
Unable to find the requested Boost libraries.
Boost version: 1.67.0
Boost include path: W:/boost/1.67.0
Could not find the following static Boost libraries:
boost_exception
No Boost libraries were found. You may need to set BOOST_LIBRARYDIR to the
directory containing Boost libraries or BOOST_ROOT to the location of
Boost.
Call Stack (most recent call first):
...
I performed a little investigation. It seems that the FindBoost module that is distributed with CMake does not support using an alternative toolset with MSVS generator. The function _Boost_GUESS_COMPILER_PREFIX (line 451) checks Intel, MSVC, Borland and MinGW compilers (and general UNIX case). The thing is that CMAKE_CXX_COMPILER_ID for the LLVM-vs2014 toolset is Clang. As a result, an empty Boost compiler prefix is returned by the function.
I managed to workaround the issue by adding the following check before the other checks performed by the _Boost_GUESS_COMPILER_PREFIX function:
function(_Boost_GUESS_COMPILER_PREFIX _ret)
if("x${CMAKE_CXX_COMPILER_ID}" STREQUAL "xClang")
if("${CMAKE_VS_PLATFORM_TOOLSET}" STREQUAL "LLVM-vs2010")
set(_boost_COMPILER "-vc100")
elseif("${CMAKE_VS_PLATFORM_TOOLSET}" STREQUAL "LLVM-vs2012")
set(_boost_COMPILER "-vc110")
elseif("${CMAKE_VS_PLATFORM_TOOLSET}" STREQUAL "LLVM-vs2013")
set(_boost_COMPILER "-vc120")
elseif("${CMAKE_VS_PLATFORM_TOOLSET}" STREQUAL "LLVM-vs2014")
set(_boost_COMPILER "-vc141;-vc140")
endif()
elseif("x${CMAKE_CXX_COMPILER_ID}" STREQUAL "xIntel")
# ...
I am not sure that this is the right solution in general, but it has resolved the issue that I had.
What is the correct solution to the problem?
Best regards, Innokentiy Alaytsev