[cmake] Enable IN_LIST compare policy

Enable CMake policy CMP0057, which allows `if()` statements to use the `IN_LIST`
operator. In addition, simplify several `if()` statements that used the
`list(FIND ...)` operation instead.

Author: modocache

CMakeLists.txt

@@ -8,6 +8,12 @@ if(POLICY CMP0054)
   cmake_policy(SET CMP0054 NEW)
 endif()
 
+# Enable the IN_LIST operator, as in:
+# `if(<element_variable> IN_LIST <list_variable>)`
+if(POLICY CMP0057)
+  cmake_policy(SET CMP0057 NEW)
+endif()
+
 # Add path for custom CMake modules.
 list(APPEND CMAKE_MODULE_PATH
     "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
@@ -491,11 +497,10 @@ function(is_sdk_requested name result_var_name)
   if("${SWIFT_HOST_VARIANT_SDK}" STREQUAL "${name}")
     set("${result_var_name}" "TRUE" PARENT_SCOPE)
   else()
-    list(FIND SWIFT_SDKS "${name}" sdk_index)
-    if(${sdk_index} EQUAL -1)
-      set("${result_var_name}" "FALSE" PARENT_SCOPE)
-    else()
+    if("${name}" IN_LIST SWIFT_SDKS)
       set("${result_var_name}" "TRUE" PARENT_SCOPE)
+    else()
+      set("${result_var_name}" "FALSE" PARENT_SCOPE)
     endif()
   endif()
 endfunction()

apinotes/CMakeLists.txt

@@ -67,8 +67,7 @@ endforeach()
 file(GLOB SWIFT_API_NOTES_INPUT_FILES "${SWIFT_API_NOTES_PATH}/*.apinotes")
 foreach(file ${SWIFT_API_NOTES_INPUT_FILES})
   get_filename_component(name "${file}" NAME_WE)
-  list(FIND SWIFT_API_NOTES_INPUTS "${name}" name_index)
-  if(name_index EQUAL -1)
+  if(NOT "${name}" IN_LIST SWIFT_API_NOTES_INPUTS)
     message(SEND_ERROR "Found apinotes for ${name}; please add to CMakeLists.txt")
   endif()
 endforeach()

cmake/modules/AddSwift.cmake

@@ -618,8 +618,7 @@ function(_add_swift_library_single target name)
   else()
     string(REPLACE swift "" module_name "${name}")
   endif()
-  list(FIND SWIFT_API_NOTES_INPUTS "${module_name}" overlay_index)
-  if(NOT ${overlay_index} EQUAL -1)
+  if("${module_name}" IN_LIST SWIFT_API_NOTES_INPUTS)
     set(SWIFTLIB_SINGLE_API_NOTES "${module_name}")
   endif()
 

cmake/modules/AddSwiftUnittests.cmake

@@ -60,8 +60,7 @@ function(add_swift_unittest test_dirname)
   endif()
 
   if(SWIFT_RUNTIME_USE_SANITIZERS)
-    list(FIND SWIFT_RUNTIME_USE_SANITIZERS "Thread" THREAD_INDEX)
-    if(NOT THREAD_INDEX EQUAL -1)
+    if("Thread" IN_LIST SWIFT_RUNTIME_USE_SANITIZERS)
       set_property(TARGET "${test_dirname}" APPEND_STRING PROPERTY COMPILE_FLAGS
         " -fsanitize=thread")
       set_property(TARGET "${test_dirname}" APPEND_STRING PROPERTY

cmake/modules/SwiftAddCustomCommandTarget.cmake

@@ -16,11 +16,10 @@ include(SwiftUtils)
 function(_make_acct_argument_list)
   set(args)
   foreach(k ${ARGN})
-    list(FIND options ${k} option_index)
-    if(${option_index} EQUAL -1)
-      list(APPEND args ${${k}_keyword} ${ACCT_${k}})
-    else()
+    if(${k} IN_LIST options)
       list(APPEND args ${${k}_keyword})
+    else()
+      list(APPEND args ${${k}_keyword} ${ACCT_${k}})
     endif()
   endforeach()
   set(args ${args} PARENT_SCOPE)

cmake/modules/SwiftComponents.cmake

@@ -79,8 +79,7 @@ macro(swift_configure_components)
   endforeach()
 
   foreach(component ${SWIFT_INSTALL_COMPONENTS})
-    list(FIND _SWIFT_DEFINED_COMPONENTS "${component}" index)
-    if(${index} EQUAL -1)
+    if(NOT "${component}" IN_LIST _SWIFT_DEFINED_COMPONENTS)
       message(FATAL_ERROR "unknown install component: ${component}")
     endif()
 
@@ -96,8 +95,7 @@ function(swift_is_installing_component component result_var_name)
   if("${component}" STREQUAL "never_install")
     set("${result_var_name}" FALSE PARENT_SCOPE)
   else()
-    list(FIND _SWIFT_DEFINED_COMPONENTS "${component}" index)
-    if(${index} EQUAL -1)
+    if(NOT "${component}" IN_LIST _SWIFT_DEFINED_COMPONENTS)
       message(FATAL_ERROR "unknown install component: ${component}")
     endif()
 

cmake/modules/SwiftList.cmake

@@ -3,8 +3,7 @@ include(SwiftUtils)
 function(list_subtract lhs rhs result_var_name)
   set(result)
   foreach(item IN LISTS lhs)
-    list(FIND rhs "${item}" index)
-    if(${index} EQUAL -1)
+    if(NOT "${item}" IN_LIST rhs)
       list(APPEND result "${item}")
     endif()
   endforeach()
@@ -14,8 +13,7 @@ endfunction()
 function(list_intersect lhs rhs result_var_name)
   set(result)
   foreach(item IN LISTS lhs)
-    list(FIND rhs "${item}" index)
-    if(NOT ${index} EQUAL -1)
+    if("${item}" IN_LIST rhs)
       list(APPEND result "${item}")
     endif()
   endforeach()
@@ -25,8 +23,7 @@ endfunction()
 function(list_union lhs rhs result_var_name)
   set(result)
   foreach(item IN LISTS lhs rhs)
-    list(FIND result "${item}" index)
-    if(${index} EQUAL -1)
+    if(NOT "${item}" IN_LIST result)
       list(APPEND result "${item}")
     endif()
   endforeach()

cmake/modules/SwiftXcodeSupport.cmake

@@ -31,8 +31,7 @@ function(check_imported_target_has_imported_configuration target config)
     message(FATAL_ERROR "No import configuration of ${target} specified?!")
   endif()
 
-  list(FIND IMPORTED_CONFIGS_LIST "${config}" FOUND_CONFIG)
-  if (FOUND_CONFIG EQUAL -1)
+  if(NOT "${config}" IN_LIST IMPORTED_CONFIGS_LIST)
     message(FATAL_ERROR "${target} does not have imported config '${config}'?! Instead: ${IMPORTED_CONFIGS_LIST}")
   endif()
 endfunction()

stdlib/public/CMakeLists.txt

@@ -7,8 +7,7 @@ set(SWIFT_RUNTIME_SWIFT_LINK_FLAGS)
 
 if(SWIFT_RUNTIME_USE_SANITIZERS)
   # TODO: Refactor this
-  list(FIND SWIFT_RUNTIME_USE_SANITIZERS "Thread" THREAD_INDEX)
-  if (NOT THREAD_INDEX EQUAL -1)
+  if("Thread" IN_LIST SWIFT_RUNTIME_USE_SANITIZERS)
     list(APPEND SWIFT_RUNTIME_CXX_FLAGS "-fsanitize=thread")
     list(APPEND SWIFT_RUNTIME_LINK_FLAGS "-fsanitize=thread")
     list(APPEND SWIFT_RUNTIME_SWIFT_COMPILE_FLAGS "-sanitize=thread")