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Add helpful error message in case CMAKE_CXX_COMPILER_VERSION is not set
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CMake bails out with an error message giving no clue what's going on, if
variable CMAKE_CXX_COMPILER_VERSION is not set:

    CMake Error at /usr/lib/x86_64-linux-gnu/cmake/BoostDetectToolset-1.74.0.cmake:9 (string):
      string sub-command REGEX, mode MATCHALL needs at least 5 arguments total to
      command.
    Call Stack (most recent call first):
      /usr/lib/x86_64-linux-gnu/cmake/boost_thread-1.74.0/boost_thread-config.cmake:27 (include)
      /usr/lib/x86_64-linux-gnu/cmake/Boost-1.74.0/BoostConfig.cmake:141 (find_package)
      /usr/lib/x86_64-linux-gnu/cmake/Boost-1.74.0/BoostConfig.cmake:258 (boost_find_component)
      CMakeLists.txt:7 (find_package)

    -- Boost toolset is unknown (compiler  )

The added message still leads to a CMake error, but gives the user a
better clue where to look for in her own project trying to find Boost.

Output afterwards:

    CMake Error at /usr/lib/x86_64-linux-gnu/cmake/BoostDetectToolset-1.74.0.cmake:6 (message):
      CMAKE_CXX_COMPILER_VERSION is not set!
    Call Stack (most recent call first):
      /usr/lib/x86_64-linux-gnu/cmake/boost_thread-1.74.0/boost_thread-config.cmake:27 (include)
      /usr/lib/x86_64-linux-gnu/cmake/Boost-1.74.0/BoostConfig.cmake:141 (find_package)
      /usr/lib/x86_64-linux-gnu/cmake/Boost-1.74.0/BoostConfig.cmake:258 (boost_find_component)
      CMakeLists.txt:7 (find_package)

    CMake Error at /usr/lib/x86_64-linux-gnu/cmake/BoostDetectToolset-1.74.0.cmake:8 (string):
      string sub-command REGEX, mode MATCHALL needs at least 5 arguments total to
      command.
    Call Stack (most recent call first):
      /usr/lib/x86_64-linux-gnu/cmake/boost_thread-1.74.0/boost_thread-config.cmake:27 (include)
      /usr/lib/x86_64-linux-gnu/cmake/Boost-1.74.0/BoostConfig.cmake:141 (find_package)
      /usr/lib/x86_64-linux-gnu/cmake/Boost-1.74.0/BoostConfig.cmake:258 (boost_find_component)
      CMakeLists.txt:7 (find_package)

    -- Boost toolset is unknown (compiler  )

Fixes: #74
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@LeSpocky
LeSpocky committed Sep 9, 2024
1 parent 2132658 commit 461ddd0
Showing 1 changed file with 3 additions and 0 deletions.
3 changes: 3 additions & 0 deletions BoostDetectToolset.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,9 @@
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)

if(NOT CMAKE_CXX_COMPILER_VERSION)
message(SEND_ERROR "CMAKE_CXX_COMPILER_VERSION is not set!")
endif()
string(REGEX MATCHALL "[0-9]+" _BOOST_COMPILER_VERSION ${CMAKE_CXX_COMPILER_VERSION})

list(GET _BOOST_COMPILER_VERSION 0 _BOOST_COMPILER_VERSION_MAJOR)
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