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CMakeChecksCache/CheckCCompilerFlag.cmake

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+# MIT License
+
+# Copyright (c) 2017 Cristian Adam
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+cmake_minimum_required(VERSION 3.4.3)
+
+set(cache_file ${CMAKE_CHECKS_CACHE_FILE})
+if(NOT cache_file)
+    set(cache_file ${CMAKE_BINARY_DIR}/cmake_checks_cache.txt)
+endif()
+
+# Include the content of CheckCCompilerFlag just not to have the original
+# include(CheckCSourceCompiles) which has precedence, and which doesn't have
+# a include guard, thus overriding my overriden version
+
+include(${CMAKE_CURRENT_LIST_DIR}/CheckCSourceCompiles.cmake)
+include(CMakeCheckCompilerFlagCommonPatterns)
+
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+macro (CHECK_C_COMPILER_FLAG_original _FLAG _RESULT)
+   set(SAFE_CMAKE_REQUIRED_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS}")
+   set(CMAKE_REQUIRED_DEFINITIONS "${_FLAG}")
+
+   # Normalize locale during test compilation.
+   set(_CheckCCompilerFlag_LOCALE_VARS LC_ALL LC_MESSAGES LANG)
+   foreach(v ${_CheckCCompilerFlag_LOCALE_VARS})
+     set(_CheckCCompilerFlag_SAVED_${v} "$ENV{${v}}")
+     set(ENV{${v}} C)
+   endforeach()
+   CHECK_COMPILER_FLAG_COMMON_PATTERNS(_CheckCCompilerFlag_COMMON_PATTERNS)
+   _check_c_source_compiles("int main(void) { return 0; }" ${_RESULT}
+     # Some compilers do not fail with a bad flag
+     FAIL_REGEX "command line option .* is valid for .* but not for C" # GNU
+     ${_CheckCCompilerFlag_COMMON_PATTERNS}
+     )
+   foreach(v ${_CheckCCompilerFlag_LOCALE_VARS})
+     set(ENV{${v}} ${_CheckCCompilerFlag_SAVED_${v}})
+     unset(_CheckCCompilerFlag_SAVED_${v})
+   endforeach()
+   unset(_CheckCCompilerFlag_LOCALE_VARS)
+   unset(_CheckCCompilerFlag_COMMON_PATTERNS)
+
+   set (CMAKE_REQUIRED_DEFINITIONS "${SAFE_CMAKE_REQUIRED_DEFINITIONS}")
+endmacro ()
+
+macro(check_c_compiler_flag flag variable)
+    CHECK_C_COMPILER_FLAG_original("${flag}" ${variable})
+    file(APPEND ${cache_file} "set(${variable} \"${${variable}}\" CACHE INTERNAL \"Test ${flag}\")\n")
+endmacro()