Modules: Do not implicitly add new functions via old Check Modules

The conversion of Check<Lang>CompilerFlag, SourceCompiles, and
SourceRuns over to the new functions has the possibility of breaking
projects that had functions with those existing names.

To reduce the possibility of collisions we now have all the
legacy code call functions that start with `cmake_`, and users
will need to explicitly include the new modules to get the
non-prefixed versions

Fixes: #21359

21 files changed, 380 insertions, 354 deletions

diff --git a/Modules/CheckCCompilerFlag.cmake b/Modules/CheckCCompilerFlag.cmake
index f835f29..335b437 100644
--- a/Modules/CheckCCompilerFlag.cmake
+++ b/Modules/CheckCCompilerFlag.cmake
@@ -34,8 +34,8 @@ effect or even a specific one is beyond the scope of this module.
 
 include_guard(GLOBAL)
 include(CheckCSourceCompiles)
-include(CheckCompilerFlag)
+include(Internal/CheckCompilerFlag)
 
 macro (CHECK_C_COMPILER_FLAG _FLAG _RESULT)
-  check_compiler_flag(C "${_FLAG}" ${_RESULT})
+  cmake_check_compiler_flag(C "${_FLAG}" ${_RESULT})
 endmacro ()
diff --git a/Modules/CheckCSourceCompiles.cmake b/Modules/CheckCSourceCompiles.cmake
index 975e653..698a007 100644
--- a/Modules/CheckCSourceCompiles.cmake
+++ b/Modules/CheckCSourceCompiles.cmake
@@ -66,8 +66,8 @@ Check if given C source compiles and links into an executable.
 #]=======================================================================]
 
 include_guard(GLOBAL)
-include(CheckSourceCompiles)
+include(Internal/CheckSourceCompiles)
 
 macro(CHECK_C_SOURCE_COMPILES SOURCE VAR)
-  check_source_compiles(C "${SOURCE}" ${VAR} ${ARGN})
+  cmake_check_source_compiles(C "${SOURCE}" ${VAR} ${ARGN})
 endmacro()
diff --git a/Modules/CheckCSourceRuns.cmake b/Modules/CheckCSourceRuns.cmake
index 86ad248..258b1a0 100644
--- a/Modules/CheckCSourceRuns.cmake
+++ b/Modules/CheckCSourceRuns.cmake
@@ -65,8 +65,8 @@ subsequently be run.
 #]=======================================================================]
 
 include_guard(GLOBAL)
-include(CheckSourceRuns)
+include(Internal/CheckSourceRuns)
 
 macro(CHECK_C_SOURCE_RUNS SOURCE VAR)
-  check_source_runs(C "${SOURCE}" ${VAR} ${ARGN})
+  cmake_check_source_runs(C "${SOURCE}" ${VAR} ${ARGN})
 endmacro()
diff --git a/Modules/CheckCXXCompilerFlag.cmake b/Modules/CheckCXXCompilerFlag.cmake
index ce49ae3..3bc3463 100644
--- a/Modules/CheckCXXCompilerFlag.cmake
+++ b/Modules/CheckCXXCompilerFlag.cmake
@@ -34,8 +34,8 @@ effect or even a specific one is beyond the scope of this module.
 
 include_guard(GLOBAL)
 include(CheckCXXSourceCompiles)
-include(CheckCompilerFlag)
+include(Internal/CheckCompilerFlag)
 
 macro (CHECK_CXX_COMPILER_FLAG _FLAG _RESULT)
-  check_compiler_flag(CXX "${_FLAG}" ${_RESULT})
+  cmake_check_compiler_flag(CXX "${_FLAG}" ${_RESULT})
 endmacro ()
diff --git a/Modules/CheckCXXSourceCompiles.cmake b/Modules/CheckCXXSourceCompiles.cmake
index f7f9d0b..dc209b2 100644
--- a/Modules/CheckCXXSourceCompiles.cmake
+++ b/Modules/CheckCXXSourceCompiles.cmake
@@ -66,8 +66,8 @@ Check if given C++ source compiles and links into an executable.
 #]=======================================================================]
 
 include_guard(GLOBAL)
-include(CheckSourceCompiles)
+include(Internal/CheckSourceCompiles)
 
 macro(CHECK_CXX_SOURCE_COMPILES SOURCE VAR)
-  check_source_compiles(CXX "${SOURCE}" ${VAR} ${ARGN})
+  cmake_check_source_compiles(CXX "${SOURCE}" ${VAR} ${ARGN})
 endmacro()
diff --git a/Modules/CheckCXXSourceRuns.cmake b/Modules/CheckCXXSourceRuns.cmake
index 70511ee..246c873 100644
--- a/Modules/CheckCXXSourceRuns.cmake
+++ b/Modules/CheckCXXSourceRuns.cmake
@@ -65,8 +65,8 @@ subsequently be run.
 #]=======================================================================]
 
 include_guard(GLOBAL)
-include(CheckSourceRuns)
+include(Internal/CheckSourceRuns)
 
 macro(CHECK_CXX_SOURCE_RUNS SOURCE VAR)
-  check_source_runs(CXX "${SOURCE}" ${VAR} ${ARGN})
+  cmake_check_source_runs(CXX "${SOURCE}" ${VAR} ${ARGN})
 endmacro()
diff --git a/Modules/CheckCompilerFlag.cmake b/Modules/CheckCompilerFlag.cmake
index d7789df..77c07b9 100644
--- a/Modules/CheckCompilerFlag.cmake
+++ b/Modules/CheckCompilerFlag.cmake
@@ -34,78 +34,8 @@ effect or even a specific one is beyond the scope of this module.
 #]=======================================================================]
 
 include_guard(GLOBAL)
-include(CheckSourceCompiles)
-include(CMakeCheckCompilerFlagCommonPatterns)
-
-cmake_policy(PUSH)
-cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
-cmake_policy(SET CMP0057 NEW) # if() supports IN_LIST
+include(Internal/CheckCompilerFlag)
 
 function(CHECK_COMPILER_FLAG _lang _flag _var)
-
-  if(_lang STREQUAL C)
-    set(_lang_src "int main(void) { return 0; }")
-    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for C")
-  elseif(_lang STREQUAL CXX)
-    set(_lang_src "int main() { return 0; }")
-    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for C\\+\\+")
-    elseif(_lang STREQUAL CUDA)
-    set(_lang_src "__host__ int main() { return 0; }")
-    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for C\\+\\+" # Host GNU
-                         FAIL_REGEX "argument unused during compilation: .*") # Clang
-  elseif(_lang STREQUAL Fortran)
-    set(_lang_src "       program test\n       stop\n       end program")
-    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for Fortran")
-  elseif(_lang STREQUAL OBJC)
-    set(_lang_src [=[
-#ifndef __OBJC__
-#  error "Not an Objective-C compiler"
-#endif
-int main(void) { return 0; }]=])
-    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for Objective-C" # GNU
-                         FAIL_REGEX "argument unused during compilation: .*") # Clang
-  elseif(_lang STREQUAL OBJCXX)
-    set(_lang_src [=[
-#ifndef __OBJC__
-#  error "Not an Objective-C++ compiler"
-#endif
-int main(void) { return 0; }]=])
-    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for Objective-C\\+\\+" # GNU
-                         FAIL_REGEX "argument unused during compilation: .*") # Clang
-  elseif(_lang STREQUAL ISPC)
-    set(_lang_src "float func(uniform int32, float a) { return a / 2.25; }")
-  else()
-    message (SEND_ERROR "check_compiler_flag: ${_lang}: unknown language.")
-    return()
-  endif()
-
-  get_property (_supported_languages GLOBAL PROPERTY ENABLED_LANGUAGES)
-  if (NOT _lang IN_LIST _supported_languages)
-    message (SEND_ERROR "check_compiler_flag: ${_lang}: needs to be enabled before use.")
-    return()
-  endif()
-
-  set(CMAKE_REQUIRED_DEFINITIONS ${_flag})
-
-  # Normalize locale during test compilation.
-  set(_locale_vars LC_ALL LC_MESSAGES LANG)
-  foreach(v IN LISTS _locale_vars)
-    set(_locale_vars_saved_${v} "$ENV{${v}}")
-    set(ENV{${v}} C)
-  endforeach()
-
-  check_compiler_flag_common_patterns(_common_patterns)
-  check_source_compiles(${_lang}
-    "${_lang_src}"
-    ${_var}
-    ${_lang_fail_regex}
-    ${_common_patterns}
-    )
-
-  foreach(v IN LISTS _locale_vars)
-    set(ENV{${v}} ${_locale_vars_saved_${v}})
-  endforeach()
-  set(${_var} "${${_var}}" PARENT_SCOPE)
-endfunction ()
-
-cmake_policy(POP)
+  cmake_check_compiler_flag(${_lang} "${_flag}" ${_var})
+endfunction()
diff --git a/Modules/CheckFortranCompilerFlag.cmake b/Modules/CheckFortranCompilerFlag.cmake
index 0f5cf9a..5b1cd02 100644
--- a/Modules/CheckFortranCompilerFlag.cmake
+++ b/Modules/CheckFortranCompilerFlag.cmake
@@ -36,8 +36,8 @@ effect or even a specific one is beyond the scope of this module.
 
 include_guard(GLOBAL)
 include(CheckFortranSourceCompiles)
-include(CheckCompilerFlag)
+include(Internal/CheckCompilerFlag)
 
 macro (CHECK_FORTRAN_COMPILER_FLAG _FLAG _RESULT)
-  check_compiler_flag(Fortran "${_FLAG}" ${_RESULT})
+  cmake_check_compiler_flag(Fortran "${_FLAG}" ${_RESULT})
 endmacro ()
diff --git a/Modules/CheckFortranSourceCompiles.cmake b/Modules/CheckFortranSourceCompiles.cmake
index 169b829..5ede284 100644
--- a/Modules/CheckFortranSourceCompiles.cmake
+++ b/Modules/CheckFortranSourceCompiles.cmake
@@ -87,10 +87,10 @@ Check if given Fortran source compiles and links into an executable.
 #]=======================================================================]
 
 include_guard(GLOBAL)
-include(CheckSourceCompiles)
+include(Internal/CheckSourceCompiles)
 
 macro(CHECK_Fortran_SOURCE_COMPILES SOURCE VAR)
   # Pass the SRC_EXT we used by default historically.
   # A user-provided SRC_EXT argument in ARGN will override ours.
-  check_source_compiles(Fortran "${SOURCE}" ${VAR} SRC_EXT "F" ${ARGN})
+  cmake_check_source_compiles(Fortran "${SOURCE}" ${VAR} SRC_EXT "F" ${ARGN})
 endmacro()
diff --git a/Modules/CheckFortranSourceRuns.cmake b/Modules/CheckFortranSourceRuns.cmake
index 5276709..28f713f 100644
--- a/Modules/CheckFortranSourceRuns.cmake
+++ b/Modules/CheckFortranSourceRuns.cmake
@@ -83,10 +83,10 @@ subsequently be run.
 #]=======================================================================]
 
 include_guard(GLOBAL)
-include(CheckSourceRuns)
+include(Internal/CheckSourceRuns)
 
 macro(CHECK_Fortran_SOURCE_RUNS SOURCE VAR)
   # Pass the SRC_EXT we used by default historically.
   # A user-provided SRC_EXT argument in ARGN will override ours.
-  check_source_runs(Fortran "${SOURCE}" ${VAR} SRC_EXT "F90" ${ARGN})
+  cmake_check_source_runs(Fortran "${SOURCE}" ${VAR} SRC_EXT "F90" ${ARGN})
 endmacro()
diff --git a/Modules/CheckOBJCCompilerFlag.cmake b/Modules/CheckOBJCCompilerFlag.cmake
index df9d724..d8d8741 100644
--- a/Modules/CheckOBJCCompilerFlag.cmake
+++ b/Modules/CheckOBJCCompilerFlag.cmake
@@ -36,8 +36,8 @@ effect or even a specific one is beyond the scope of this module.
 
 include_guard(GLOBAL)
 include(CheckOBJCSourceCompiles)
-include(CheckCompilerFlag)
+include(Internal/CheckCompilerFlag)
 
 macro (CHECK_OBJC_COMPILER_FLAG _FLAG _RESULT)
-  check_compiler_flag(OBJC "${_FLAG}" ${_RESULT})
+  cmake_check_compiler_flag(OBJC "${_FLAG}" ${_RESULT})
 endmacro ()
diff --git a/Modules/CheckOBJCSourceCompiles.cmake b/Modules/CheckOBJCSourceCompiles.cmake
index aad2bdc..c268ef9 100644
--- a/Modules/CheckOBJCSourceCompiles.cmake
+++ b/Modules/CheckOBJCSourceCompiles.cmake
@@ -68,8 +68,8 @@ Check if given Objective-C source compiles and links into an executable.
 #]=======================================================================]
 
 include_guard(GLOBAL)
-include(CheckSourceCompiles)
+include(Internal/CheckSourceCompiles)
 
 macro(CHECK_OBJC_SOURCE_COMPILES SOURCE VAR)
-  check_source_compiles(OBJC "${SOURCE}" ${VAR} ${ARGN})
+  cmake_check_source_compiles(OBJC "${SOURCE}" ${VAR} ${ARGN})
 endmacro()
diff --git a/Modules/CheckOBJCSourceRuns.cmake b/Modules/CheckOBJCSourceRuns.cmake
index dadab21..9894180 100644
--- a/Modules/CheckOBJCSourceRuns.cmake
+++ b/Modules/CheckOBJCSourceRuns.cmake
@@ -67,8 +67,8 @@ subsequently be run.
 #]=======================================================================]
 
 include_guard(GLOBAL)
-include(CheckSourceRuns)
+include(Internal/CheckSourceRuns)
 
 macro(CHECK_OBJC_SOURCE_RUNS SOURCE VAR)
-  check_source_runs(OBJC "${SOURCE}" ${VAR} ${ARGN})
+  cmake_check_source_runs(OBJC "${SOURCE}" ${VAR} ${ARGN})
 endmacro()
diff --git a/Modules/CheckOBJCXXCompilerFlag.cmake b/Modules/CheckOBJCXXCompilerFlag.cmake
index 6e01bcc..3f3f8fe 100644
--- a/Modules/CheckOBJCXXCompilerFlag.cmake
+++ b/Modules/CheckOBJCXXCompilerFlag.cmake
@@ -36,8 +36,8 @@ effect or even a specific one is beyond the scope of this module.
 
 include_guard(GLOBAL)
 include(CheckOBJCXXSourceCompiles)
-include(CheckCompilerFlag)
+include(Internal/CheckCompilerFlag)
 
 macro (CHECK_OBJCXX_COMPILER_FLAG _FLAG _RESULT)
-  check_compiler_flag(OBJCXX "${_FLAG}" ${_RESULT})
+  cmake_check_compiler_flag(OBJCXX "${_FLAG}" ${_RESULT})
 endmacro ()
diff --git a/Modules/CheckOBJCXXSourceCompiles.cmake b/Modules/CheckOBJCXXSourceCompiles.cmake
index 37dabfe..1186934 100644
--- a/Modules/CheckOBJCXXSourceCompiles.cmake
+++ b/Modules/CheckOBJCXXSourceCompiles.cmake
@@ -68,8 +68,8 @@ Check if given Objective-C++ source compiles and links into an executable.
 #]=======================================================================]
 
 include_guard(GLOBAL)
-include(CheckSourceCompiles)
+include(Internal/CheckSourceCompiles)
 
 macro(CHECK_OBJCXX_SOURCE_COMPILES SOURCE VAR)
-  check_source_compiles(OBJCXX "${SOURCE}" ${VAR} ${ARGN})
+  cmake_check_source_compiles(OBJCXX "${SOURCE}" ${VAR} ${ARGN})
 endmacro()
diff --git a/Modules/CheckOBJCXXSourceRuns.cmake b/Modules/CheckOBJCXXSourceRuns.cmake
index 200e799..43d514f 100644
--- a/Modules/CheckOBJCXXSourceRuns.cmake
+++ b/Modules/CheckOBJCXXSourceRuns.cmake
@@ -67,8 +67,8 @@ subsequently be run.
 #]=======================================================================]
 
 include_guard(GLOBAL)
-include(CheckSourceRuns)
+include(Internal/CheckSourceRuns)
 
 macro(CHECK_OBJCXX_SOURCE_RUNS SOURCE VAR)
-  check_source_runs(OBJCXX "${SOURCE}" ${VAR} ${ARGN})
+  cmake_check_source_runs(OBJCXX "${SOURCE}" ${VAR} ${ARGN})
 endmacro()
diff --git a/Modules/CheckSourceCompiles.cmake b/Modules/CheckSourceCompiles.cmake
index 4ed9a5c..ad74c3c 100644
--- a/Modules/CheckSourceCompiles.cmake
+++ b/Modules/CheckSourceCompiles.cmake
@@ -75,127 +75,8 @@ Check if given source compiles and links into an executable.
 
 
 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
+include(Internal/CheckSourceCompiles)
 
 function(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${_source}\n")
-    endif()
-  endif()
-
+  cmake_check_source_compiles(${_lang} "${_source}" ${_var} ${ARGN})
 endfunction()
-
-cmake_policy(POP)
diff --git a/Modules/CheckSourceRuns.cmake b/Modules/CheckSourceRuns.cmake
index 033793d..8f1cf01 100644
--- a/Modules/CheckSourceRuns.cmake
+++ b/Modules/CheckSourceRuns.cmake
@@ -73,136 +73,8 @@ subsequently be run.
 #]=======================================================================]
 
 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
+include(Internal/CheckSourceRuns)
 
 function(CHECK_SOURCE_RUNS _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 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_runs: ${_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_runs: ${_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 ${_var}")
-    endif()
-    try_run(${_var}_EXITCODE ${_var}_COMPILED
-      ${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=${CMAKE_REQUIRED_FLAGS}
-      -DCMAKE_SKIP_RPATH:BOOL=${CMAKE_SKIP_RPATH}
-      "${CHECK_${_lang}_SOURCE_COMPILES_ADD_INCLUDES}"
-      COMPILE_OUTPUT_VARIABLE OUTPUT
-      RUN_OUTPUT_VARIABLE RUN_OUTPUT)
-    # if it did not compile make the return value fail code of 1
-    if(NOT ${_var}_COMPILED)
-      set(${_var}_EXITCODE 1)
-      set(${_var}_EXITCODE 1 PARENT_SCOPE)
-    endif()
-    # if the return value was 0 then it worked
-    if("${${_var}_EXITCODE}" EQUAL 0)
-      set(${_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 ${_var} succeeded with the following compile output:\n"
-        "${OUTPUT}\n"
-        "...and run output:\n"
-        "${RUN_OUTPUT}\n"
-        "Return value: ${${_var}}\n"
-        "Source file was:\n${_source}\n")
-    else()
-      if(CMAKE_CROSSCOMPILING AND "${${_var}_EXITCODE}" MATCHES  "FAILED_TO_RUN")
-        set(${_var} "${${_var}_EXITCODE}" PARENT_SCOPE)
-      else()
-        set(${_var} "" CACHE INTERNAL "Test ${_var}")
-      endif()
-
-      if(NOT CMAKE_REQUIRED_QUIET)
-        message(CHECK_FAIL "Failed")
-      endif()
-      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
-        "Performing ${_lang_textual} SOURCE FILE Test ${_var} failed with the following compile output:\n"
-        "${OUTPUT}\n"
-        "...and run output:\n"
-        "${RUN_OUTPUT}\n"
-        "Return value: ${${_var}_EXITCODE}\n"
-        "Source file was:\n${_source}\n")
-
-    endif()
-  endif()
+  cmake_check_source_runs(${_lang} "${_source}" ${_var} ${ARGN})
 endfunction()
-
-cmake_policy(POP)
diff --git a/Modules/Internal/CheckCompilerFlag.cmake b/Modules/Internal/CheckCompilerFlag.cmake
new file mode 100644
index 0000000..f790d87
--- /dev/null
+++ b/Modules/Internal/CheckCompilerFlag.cmake
@@ -0,0 +1,79 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+include_guard(GLOBAL)
+include(Internal/CheckSourceCompiles)
+include(CMakeCheckCompilerFlagCommonPatterns)
+
+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_COMPILER_FLAG _lang _flag _var)
+
+  if(_lang STREQUAL C)
+    set(_lang_src "int main(void) { return 0; }")
+    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for C")
+  elseif(_lang STREQUAL CXX)
+    set(_lang_src "int main() { return 0; }")
+    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for C\\+\\+")
+    elseif(_lang STREQUAL CUDA)
+    set(_lang_src "__host__ int main() { return 0; }")
+    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for C\\+\\+" # Host GNU
+                         FAIL_REGEX "argument unused during compilation: .*") # Clang
+  elseif(_lang STREQUAL Fortran)
+    set(_lang_src "       program test\n       stop\n       end program")
+    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for Fortran")
+  elseif(_lang STREQUAL OBJC)
+    set(_lang_src [=[
+#ifndef __OBJC__
+#  error "Not an Objective-C compiler"
+#endif
+int main(void) { return 0; }]=])
+    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for Objective-C" # GNU
+                         FAIL_REGEX "argument unused during compilation: .*") # Clang
+  elseif(_lang STREQUAL OBJCXX)
+    set(_lang_src [=[
+#ifndef __OBJC__
+#  error "Not an Objective-C++ compiler"
+#endif
+int main(void) { return 0; }]=])
+    set(_lang_fail_regex FAIL_REGEX "command[ -]line option .* is valid for .* but not for Objective-C\\+\\+" # GNU
+                         FAIL_REGEX "argument unused during compilation: .*") # Clang
+  elseif(_lang STREQUAL ISPC)
+    set(_lang_src "float func(uniform int32, float a) { return a / 2.25; }")
+  else()
+    message (SEND_ERROR "check_compiler_flag: ${_lang}: unknown language.")
+    return()
+  endif()
+
+  get_property (_supported_languages GLOBAL PROPERTY ENABLED_LANGUAGES)
+  if (NOT _lang IN_LIST _supported_languages)
+    message (SEND_ERROR "check_compiler_flag: ${_lang}: needs to be enabled before use.")
+    return()
+  endif()
+
+  set(CMAKE_REQUIRED_DEFINITIONS ${_flag})
+
+  # Normalize locale during test compilation.
+  set(_locale_vars LC_ALL LC_MESSAGES LANG)
+  foreach(v IN LISTS _locale_vars)
+    set(_locale_vars_saved_${v} "$ENV{${v}}")
+    set(ENV{${v}} C)
+  endforeach()
+
+  check_compiler_flag_common_patterns(_common_patterns)
+  cmake_check_source_compiles(${_lang}
+    "${_lang_src}"
+    ${_var}
+    ${_lang_fail_regex}
+    ${_common_patterns}
+    )
+
+  foreach(v IN LISTS _locale_vars)
+    set(ENV{${v}} ${_locale_vars_saved_${v}})
+  endforeach()
+  set(${_var} "${${_var}}" PARENT_SCOPE)
+endfunction ()
+
+cmake_policy(POP)
diff --git a/Modules/Internal/CheckSourceCompiles.cmake b/Modules/Internal/CheckSourceCompiles.cmake
new file mode 100644
index 0000000..91c8964
--- /dev/null
+++ b/Modules/Internal/CheckSourceCompiles.cmake
@@ -0,0 +1,127 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+include_guard(GLOBAL)
+
+cmake_policy(PUSH)
+cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
+cmake_policy(SET CMP0057 NEW) # if() supports IN_LIST
+
+function(CMAKE_CHECK_SOURCE_COMPILES _lang _source _var)
+  if(NOT DEFINED "${_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${_source}\n")
+    endif()
+  endif()
+endfunction()
+
+cmake_policy(POP)
diff --git a/Modules/Internal/CheckSourceRuns.cmake b/Modules/Internal/CheckSourceRuns.cmake
new file mode 100644
index 0000000..c667245
--- /dev/null
+++ b/Modules/Internal/CheckSourceRuns.cmake
@@ -0,0 +1,137 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+include_guard(GLOBAL)
+
+cmake_policy(PUSH)
+cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
+cmake_policy(SET CMP0057 NEW) # if() supports IN_LIST
+
+function(CMAKE_CHECK_SOURCE_RUNS _lang _source _var)
+  if(NOT DEFINED "${_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 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_runs: ${_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_runs: ${_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 ${_var}")
+    endif()
+    try_run(${_var}_EXITCODE ${_var}_COMPILED
+      ${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=${CMAKE_REQUIRED_FLAGS}
+      -DCMAKE_SKIP_RPATH:BOOL=${CMAKE_SKIP_RPATH}
+      "${CHECK_${_lang}_SOURCE_COMPILES_ADD_INCLUDES}"
+      COMPILE_OUTPUT_VARIABLE OUTPUT
+      RUN_OUTPUT_VARIABLE RUN_OUTPUT)
+    # if it did not compile make the return value fail code of 1
+    if(NOT ${_var}_COMPILED)
+      set(${_var}_EXITCODE 1)
+      set(${_var}_EXITCODE 1 PARENT_SCOPE)
+    endif()
+    # if the return value was 0 then it worked
+    if("${${_var}_EXITCODE}" EQUAL 0)
+      set(${_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 ${_var} succeeded with the following compile output:\n"
+        "${OUTPUT}\n"
+        "...and run output:\n"
+        "${RUN_OUTPUT}\n"
+        "Return value: ${${_var}}\n"
+        "Source file was:\n${_source}\n")
+    else()
+      if(CMAKE_CROSSCOMPILING AND "${${_var}_EXITCODE}" MATCHES  "FAILED_TO_RUN")
+        set(${_var} "${${_var}_EXITCODE}" PARENT_SCOPE)
+      else()
+        set(${_var} "" CACHE INTERNAL "Test ${_var}")
+      endif()
+
+      if(NOT CMAKE_REQUIRED_QUIET)
+        message(CHECK_FAIL "Failed")
+      endif()
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+        "Performing ${_lang_textual} SOURCE FILE Test ${_var} failed with the following compile output:\n"
+        "${OUTPUT}\n"
+        "...and run output:\n"
+        "${RUN_OUTPUT}\n"
+        "Return value: ${${_var}_EXITCODE}\n"
+        "Source file was:\n${_source}\n")
+
+    endif()
+  endif()
+endfunction()
+
+cmake_policy(POP)