CMake: Runtimes: Specify language mode explicitly.

The compiler will soon require that any module with a `.swiftinterface` be
built with an explicit language mode specified on the command line. This
prevents misinterpretation of the `.swiftinterface` when building it for
clients that aren't building with the default language mode.

Add explicit `-swift-version` arguments to the builds of various Runtimes
libraries to comply with this new requirement.

Author: tshortli

Runtimes/Core/CMakeLists.txt

@@ -181,6 +181,7 @@ add_link_options($<$<PLATFORM_ID:Linux>:LINKER:-z,defs>)
 add_compile_options(
   $<$<COMPILE_LANGUAGE:Swift>:-explicit-module-build>
   "$<$<COMPILE_LANGUAGE:Swift>:-nostdlibimport>"
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-swift-version 5>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-library-level api>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-runtime-compatibility-version none>"
   "$<$<COMPILE_LANGUAGE:Swift>:-disable-autolinking-runtime-compatibility-dynamic-replacements>"

Runtimes/Overlay/Cxx/CMakeLists.txt

@@ -31,6 +31,7 @@ target_compile_options(swiftCxx PRIVATE
   # This module should not pull in the C++ standard library, so we disable it
   # explicitly.  For functionality that depends on the C++ stdlib, use C++
   # stdlib overlay (`swiftstd` module).
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-swift-version 5>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xcc -nostdinc++>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature AllowUnsafeAttribute>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature BuiltinModule>"

Runtimes/Supplemental/Differentiation/CMakeLists.txt

@@ -66,6 +66,7 @@ add_compile_options(
   $<$<COMPILE_LANGUAGE:Swift>:-explicit-module-build>
   $<$<COMPILE_LANGUAGE:Swift>:-nostdlibimport>
   $<$<COMPILE_LANGUAGE:Swift>:-parse-stdlib>
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-swift-version 5>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-library-level api>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature NoncopyableGenerics2>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature SuppressedAssociatedTypes>"

Runtimes/Supplemental/Distributed/CMakeLists.txt

@@ -75,6 +75,7 @@ add_compile_options(
   $<$<COMPILE_LANGUAGE:Swift>:-explicit-module-build>
   $<$<COMPILE_LANGUAGE:Swift>:-nostdlibimport>
   $<$<COMPILE_LANGUAGE:Swift>:-strict-memory-safety>
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-swift-version 5>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature NoncopyableGenerics2>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature SuppressedAssociatedTypes>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature SE427NoInferenceOnExtension>"

Runtimes/Supplemental/Observation/CMakeLists.txt

@@ -66,6 +66,7 @@ option(${PROJECT_NAME}_ENABLE_PRESPECIALIZATION "Enable generic metadata prespec
 add_compile_options(
   $<$<COMPILE_LANGUAGE:Swift>:-explicit-module-build>
   $<$<COMPILE_LANGUAGE:Swift>:-nostdlibimport>
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-swift-version 5>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xfrontend -enforce-exclusivity=unchecked>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xfrontend -target-min-inlining-version -Xfrontend min>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xfrontend -disable-implicit-string-processing-module-import>"

Runtimes/Supplemental/StringProcessing/CMakeLists.txt

@@ -52,6 +52,7 @@ option(${PROJECT_NAME}_ENABLE_PRESPECIALIZATION "Enable generic metadata prespec
 add_compile_options(
   $<$<COMPILE_LANGUAGE:Swift>:-explicit-module-build>
   $<$<COMPILE_LANGUAGE:Swift>:-nostdlibimport>
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-swift-version 5>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xfrontend -disable-implicit-concurrency-module-import>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xfrontend -disable-implicit-string-processing-module-import>"
   "$<$<COMPILE_LANGUAGE:Swift>:-warn-implicit-overrides>"

Runtimes/Supplemental/Synchronization/CMakeLists.txt

@@ -71,6 +71,7 @@ add_compile_options(
   $<$<COMPILE_LANGUAGE:Swift>:-nostdlibimport>
   $<$<COMPILE_LANGUAGE:Swift>:-enable-builtin-module>
   $<$<COMPILE_LANGUAGE:Swift>:-strict-memory-safety>
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-swift-version 5>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature NoncopyableGenerics2>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature SuppressedAssociatedTypes>"
   "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-enable-experimental-feature SE427NoInferenceOnExtension>"

Runtimes/Supplemental/Volatile/CMakeLists.txt

@@ -66,6 +66,7 @@ add_compile_options(
   $<$<COMPILE_LANGUAGE:Swift>:-explicit-module-build>
   $<$<COMPILE_LANGUAGE:Swift>:-nostdlibimport>
   $<$<COMPILE_LANGUAGE:Swift>:-strict-memory-safety>
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-swift-version 5>"
   "$<$<AND:$<BOOL:${${PROJECT_NAME}_ENABLE_LIBRARY_EVOLUTION}>,$<COMPILE_LANGUAGE:Swift>>:-enable-library-evolution>"
   "$<$<AND:$<BOOL:${${PROJECT_NAME}_ENABLE_PRESPECIALIZATION}>,$<COMPILE_LANGUAGE:Swift>>:SHELL:-Xfrontend -prespecialize-generic-metadata>")