1 files changed, 127 insertions, 0 deletions
diff --git a/Modules/Internal/CheckSourceCompiles.cmake b/Modules/Internal/CheckSourceCompiles.cmake
new file mode 100644
index 0000000..91c8964
--- /dev/null
+++ b/Modules/Internal/CheckSourceCompiles.cmake
@@ -0,0 +1,127 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+include_guard(GLOBAL)
+
+cmake_policy(PUSH)
+cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
+cmake_policy(SET CMP0057 NEW) # if() supports IN_LIST
+
+function(CMAKE_CHECK_SOURCE_COMPILES _lang _source _var)
+  if(NOT DEFINED "${_var}")
+
+    if(_lang STREQUAL C)
+      set(_lang_textual "C")
+      set(_lang_ext "c")
+    elseif(_lang STREQUAL CXX)
+      set(_lang_textual "C++")
+      set(_lang_ext "cxx")
+    elseif(_lang STREQUAL CUDA)
+      set(_lang_textual "CUDA")
+      set(_lang_ext "cu")
+    elseif(_lang STREQUAL Fortran)
+      set(_lang_textual "Fortran")
+      set(_lang_ext "F90")
+    elseif(_lang STREQUAL ISPC)
+      set(_lang_textual "ISPC")
+      set(_lang_ext "ispc")
+    elseif(_lang STREQUAL OBJC)
+      set(_lang_textual "Objective-C")
+      set(_lang_ext "m")
+    elseif(_lang STREQUAL OBJCXX)
+      set(_lang_textual "Objective-C++")
+      set(_lang_ext "mm")
+    else()
+      message (SEND_ERROR "check_source_compiles: ${_lang}: unknown language.")
+      return()
+    endif()
+
+    get_property (_supported_languages GLOBAL PROPERTY ENABLED_LANGUAGES)
+    if (NOT _lang IN_LIST _supported_languages)
+      message (SEND_ERROR "check_source_compiles: ${_lang}: needs to be enabled before use.")
+      return()
+    endif()
+
+    set(_FAIL_REGEX)
+    set(_SRC_EXT)
+    set(_key)
+    foreach(arg ${ARGN})
+      if("${arg}" MATCHES "^(FAIL_REGEX|SRC_EXT)$")
+        set(_key "${arg}")
+      elseif(_key STREQUAL "FAIL_REGEX")
+        list(APPEND _FAIL_REGEX "${arg}")
+      elseif(_key STREQUAL "SRC_EXT")
+        set(_SRC_EXT "${arg}")
+        set(_key "")
+      else()
+        message(FATAL_ERROR "Unknown argument:\n  ${arg}\n")
+      endif()
+    endforeach()
+
+    if(NOT _SRC_EXT)
+      set(_SRC_EXT ${_lang_ext})
+    endif()
+
+    if(CMAKE_REQUIRED_LINK_OPTIONS)
+      set(CHECK_${LANG}_SOURCE_COMPILES_ADD_LINK_OPTIONS
+        LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
+    else()
+      set(CHECK_${LANG}_SOURCE_COMPILES_ADD_LINK_OPTIONS)
+    endif()
+    if(CMAKE_REQUIRED_LIBRARIES)
+      set(CHECK_${LANG}_SOURCE_COMPILES_ADD_LIBRARIES
+        LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
+    else()
+      set(CHECK_${LANG}_SOURCE_COMPILES_ADD_LIBRARIES)
+    endif()
+    if(CMAKE_REQUIRED_INCLUDES)
+      set(CHECK_${LANG}_SOURCE_COMPILES_ADD_INCLUDES
+        "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
+    else()
+      set(CHECK_${LANG}_SOURCE_COMPILES_ADD_INCLUDES)
+    endif()
+    file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.${_SRC_EXT}"
+      "${_source}\n")
+
+    if(NOT CMAKE_REQUIRED_QUIET)
+      message(CHECK_START "Performing Test ${_var}")
+    endif()
+    try_compile(${_var}
+      ${CMAKE_BINARY_DIR}
+      ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.${_SRC_EXT}
+      COMPILE_DEFINITIONS -D${_var} ${CMAKE_REQUIRED_DEFINITIONS}
+      ${CHECK_${LANG}_SOURCE_COMPILES_ADD_LINK_OPTIONS}
+      ${CHECK_${LANG}_SOURCE_COMPILES_ADD_LIBRARIES}
+      CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${CMAKE_REQUIRED_FLAGS}
+      "${CHECK_${LANG}_SOURCE_COMPILES_ADD_INCLUDES}"
+      OUTPUT_VARIABLE OUTPUT)
+
+    foreach(_regex ${_FAIL_REGEX})
+      if("${OUTPUT}" MATCHES "${_regex}")
+        set(${_var} 0)
+      endif()
+    endforeach()
+
+    if(${_var})
+      set(${_var} 1 CACHE INTERNAL "Test ${_var}")
+      if(NOT CMAKE_REQUIRED_QUIET)
+        message(CHECK_PASS "Success")
+      endif()
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+        "Performing ${_lang_textual} SOURCE FILE Test ${_var} succeeded with the following output:\n"
+        "${OUTPUT}\n"
+        "Source file was:\n${_source}\n")
+    else()
+      if(NOT CMAKE_REQUIRED_QUIET)
+        message(CHECK_FAIL "Failed")
+      endif()
+      set(${_var} "" CACHE INTERNAL "Test ${_var}")
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+        "Performing ${_lang_textual} SOURCE FILE Test ${_var} failed with the following output:\n"
+        "${OUTPUT}\n"
+        "Source file was:\n${_source}\n")
+    endif()
+  endif()
+endfunction()
+
+cmake_policy(POP)