Add C++11/C++14/C++17 compatibility checks

Author: robertodr

cmake/custom/compilers/compatibility/.gitignore

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+build*/
+
+CMakeCache.txt
+CMakeFiles/
+
+#vscode
+.vscode/
+
+# Jetbrains
+.idea/

cmake/custom/compilers/compatibility/.travis.yml

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+language: cpp
+
+addons:
+  apt:
+    sources:
+      - ubuntu-toolchain-r-test
+    packages:
+      - g++-5
+
+install:
+  - wget --no-check-certificate https://www.cmake.org/files/v3.3/cmake-3.3.1-Linux-x86_64.tar.gz
+  - tar -xzf cmake-3.3.1-Linux-x86_64.tar.gz
+  - export CC='gcc-5'
+  - export CXX='g++-5'
+script:
+  - mkdir build && cd build/
+  - ../cmake-3.3.1-Linux-x86_64/bin/cmake ../_test
+  - ../cmake-3.3.1-Linux-x86_64/bin/cmake --build .
+  - ./comp_test
+  - rm -r *
+  - ../cmake-3.3.1-Linux-x86_64/bin/cmake -D_COMP_TEST_WORKAROUND=ON ../_test
+  - ../cmake-3.3.1-Linux-x86_64/bin/cmake --build .
+  - ./comp_test

cmake/custom/compilers/compatibility/LICENSE

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+Copyright (C) 2015-2016 Jonathan Müller <[email protected]>
+
+This software is provided 'as-is', without any express or
+implied warranty. In no event will the authors be held
+liable for any damages arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute
+it freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented;
+   you must not claim that you wrote the original software.
+   If you use this software in a product, an acknowledgment
+   in the product documentation would be appreciated but
+   is not required.
+
+2. Altered source versions must be plainly marked as such,
+   and must not be misrepresented as being the original software.
+
+3. This notice may not be removed or altered from any
+   source distribution.

cmake/custom/compilers/compatibility/README.md

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+# Copyright (C) 2015-2016 Jonathan Müller <[email protected]>
+# This file is subject to the license terms in the LICENSE file
+# found in the top-level directory of this distribution.
+
+cmake_minimum_required(VERSION 3.1)
+project(COMPATIBILITY_TEST)
+
+set(_COMP_TEST ${CMAKE_CURRENT_BINARY_DIR}/test)
+
+# download catch
+file(DOWNLOAD
+        https://raw.githubusercontent.com/philsquared/Catch/master/single_include/catch.hpp
+        ${_COMP_TEST}/catch.downloaded
+        SHOW_PROGESS
+        STATUS status
+        LOG log)
+
+list(GET status 0 status_code)
+list(GET status 1 status_string)
+if((NOT EXISTS  ${_COMP_TEST}/catch.hpp) AND (NOT status_code EQUAL 0))
+    message(FATAL_ERROR "error downloading catch: ${status_string}"
+            "${log}")
+else()
+    # succesful download, replace old catch.hpp
+    file(RENAME ${_COMP_TEST}/catch.downloaded  ${_COMP_TEST}/catch.hpp)
+endif()
+
+include(../comp_base.cmake)
+
+set(feature_names)
+file(GLOB features ${CMAKE_CURRENT_SOURCE_DIR}/../*/*.cmake)
+file(COPY main.cpp DESTINATION ${_COMP_TEST})
+foreach(feature ${features})
+    get_filename_component(header "${feature}" NAME_WE)
+    string(TOUPPER "${header}" macro_name)
+    get_filename_component(dir "${feature}" DIRECTORY)
+    string(FIND "${dir}" "/" last_sep REVERSE)
+    math(EXPR last_sep "${last_sep} + 1")
+    string(SUBSTRING "${dir}" ${last_sep} -1 dir)
+
+    file(APPEND ${_COMP_TEST}/main.cpp "#include COMP_${macro_name}_HEADER\n")
+    list(APPEND feature_names "${dir}/${header}")
+endforeach()
+
+add_library(_comp_test_runner INTERFACE)
+comp_target_features(_comp_test_runner INTERFACE ${feature_names}
+                      CMAKE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../ NOFLAGS)
+
+file(GLOB tests "${_COMP_TEST}/*.cpp")
+add_executable(comp_test "${tests}")
+comp_target_features(comp_test PRIVATE CPP17)
+target_link_libraries(comp_test PUBLIC _comp_test_runner)

cmake/custom/compilers/compatibility/_test/CMakeLists.txt

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+#define CATCH_CONFIG_MAIN
+#define CATCH_CONFIG_COLOUR_NONE
+#include "catch.hpp"