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Add helpful error message in case CMAKE_CXX_COMPILER_VERSION is not set #75

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Add helpful error message in case CMAKE_CXX_COMPILER_VERSION is not set #75

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3 changes: 3 additions & 0 deletions BoostDetectToolset.cmake
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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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