Update GNU_Source import for Linux

Author: iCharlesHu

Sources/FoundationEssentials/CMakeLists.txt

@@ -29,8 +29,10 @@ endif()
 
 add_dependencies(FoundationEssentials FoundationMacros)
 
-if(CMAKE_SYSTEM_NAME STREQUAL Linux)
-    target_compile_options(FoundationEssentials PRIVATE "-D_GNU_SOURCE")
+if(CMAKE_SYSTEM_NAME STREQUAL Linux OR CMAKE_SYSTEM_NAME STREQUAL Android)
+    target_compile_options(FoundationEssentials PRIVATE
+        "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -Xcc -Xfrontend -D_GNU_SOURCE>")
+    list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
 endif()
 
 target_compile_options(FoundationEssentials PRIVATE

Sources/FoundationMacros/CMakeLists.txt

@@ -44,6 +44,8 @@ FetchContent_MakeAvailable(SwiftSyntax)
 
 # Link against SwiftSyntax
 target_compile_options(FoundationMacros PRIVATE -parse-as-library)
+target_compile_options(FoundationMacros PRIVATE
+    "SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xfrontend -enable-experimental-feature -Xfrontend AccessLevelOnImport>")
 target_link_libraries(FoundationMacros
     SwiftSyntax
     SwiftSyntaxMacros