Introduce SWIFT_COMPILE_FLAGS_LINUX

Author: Alexander Shaposhnikov

cmake/modules/AddSwift.cmake

@@ -1703,6 +1703,7 @@ function(add_swift_target_library name)
         SWIFT_COMPILE_FLAGS_OSX
         SWIFT_COMPILE_FLAGS_TVOS
         SWIFT_COMPILE_FLAGS_WATCHOS
+        SWIFT_COMPILE_FLAGS_LINUX
         SWIFT_MODULE_DEPENDS
         SWIFT_MODULE_DEPENDS_CYGWIN
         SWIFT_MODULE_DEPENDS_FREEBSD
@@ -1861,6 +1862,9 @@ function(add_swift_target_library name)
     elseif(${sdk} STREQUAL WATCHOS OR ${sdk} STREQUAL WATCHOS_SIMULATOR)
       list(APPEND swiftlib_swift_compile_flags_all
            ${SWIFTLIB_SWIFT_COMPILE_FLAGS_WATCHOS})
+    elseif(${sdk} STREQUAL LINUX)
+      list(APPEND swiftlib_swift_compile_flags_all
+           ${SWIFTLIB_SWIFT_COMPILE_FLAGS_LINUX})
     elseif(${sdk} STREQUAL WINDOWS)
       # FIXME(SR2005) static and shared are not mutually exclusive; however
       # since we do a single build of the sources, this doesn't work for

stdlib/private/SwiftReflectionTest/CMakeLists.txt

@@ -2,9 +2,13 @@
 if (SWIFT_INCLUDE_TESTS)
   add_swift_target_library(swiftSwiftReflectionTest ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} IS_STDLIB
     SwiftReflectionTest.swift
-    SWIFT_MODULE_DEPENDS Darwin
-    TARGET_SDKS ALL_APPLE_PLATFORMS
     SWIFT_COMPILE_FLAGS ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
+    SWIFT_COMPILE_FLAGS_LINUX -Xcc -D_GNU_SOURCE
+    SWIFT_MODULE_DEPENDS_OSX Darwin
+    SWIFT_MODULE_DEPENDS_IOS Darwin
+    SWIFT_MODULE_DEPENDS_TVOS Darwin
+    SWIFT_MODULE_DEPENDS_WATCHOS Darwin
+    SWIFT_MODULE_DEPENDS_LINUX Glibc
     INSTALL_IN_COMPONENT stdlib-experimental
     DARWIN_INSTALL_NAME_DIR "${SWIFT_DARWIN_STDLIB_PRIVATE_INSTALL_NAME_DIR}")