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Made cmake print a very explicit error message if you try to use a version of gcc that is too old.

This commit is contained in:
Davis King 2017-10-17 19:02:31 -04:00
parent 38a2846dda
commit aa1a3b8611
1 changed files with 8 additions and 0 deletions
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8
dlib/cmake_utils/set_compiler_specific_options.cmake
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@ -16,6 +16,14 @@ elseif(MSVC AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 19.0.24215.1 )
set(USING_OLD_VISUAL_STUDIO_COMPILER 1)
endif()
if(CMAKE_COMPILER_IS_GNUCXX)
execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION)
if (GCC_VERSION VERSION_LESS 4.8)
message(FATAL_ERROR "C++11 is required to use dlib, but the version of GCC you are using is too old and doesn't support C++11. You need GCC 4.8 or newer. ")
endif()
endif()
# push USING_OLD_VISUAL_STUDIO_COMPILER to the parent so we can use it in the
# examples CMakeLists.txt file.
get_directory_property(has_parent PARENT_DIRECTORY)