cmake: add -Wno-declaration-after-statement to cpu-features.c alone

CMakeLists.txt

@@ -602,17 +602,13 @@ if(USE_GCC OR USE_CLANG)
     list(APPEND EXTRA_CFLAGS "-fno-strict-aliasing")
   endif()
 
-  # Android needs to bring in external files that don't adhere to the declaration-after-statement
-  # warning, so skip this warning on Android.
-  if(NOT ANDROID)
-    check_c_compiler_flag(-Wdeclaration-after-statement HAVE_GCC_WDECLARATION_AFTER_STATEMENT)
-    if(HAVE_GCC_WDECLARATION_AFTER_STATEMENT)
-      check_c_compiler_flag(-Werror=declaration-after-statement HAVE_GCC_WERROR_DECLARATION_AFTER_STATEMENT)
-      if(HAVE_GCC_WERROR_DECLARATION_AFTER_STATEMENT)
-        list(APPEND EXTRA_CFLAGS "-Werror=declaration-after-statement")
-      endif()
-      list(APPEND EXTRA_CFLAGS "-Wdeclaration-after-statement")
+  check_c_compiler_flag(-Wdeclaration-after-statement HAVE_GCC_WDECLARATION_AFTER_STATEMENT)
+  if(HAVE_GCC_WDECLARATION_AFTER_STATEMENT)
+    check_c_compiler_flag(-Werror=declaration-after-statement HAVE_GCC_WERROR_DECLARATION_AFTER_STATEMENT)
+    if(HAVE_GCC_WERROR_DECLARATION_AFTER_STATEMENT)
+      list(APPEND EXTRA_CFLAGS "-Werror=declaration-after-statement")
     endif()
+    list(APPEND EXTRA_CFLAGS "-Wdeclaration-after-statement")
   endif()
 
   if(DEPENDENCY_TRACKING)
@@ -1129,6 +1125,7 @@ endif()
 if(ANDROID)
   file(GLOB ANDROID_CORE_SOURCES ${SDL2_SOURCE_DIR}/src/core/android/*.c)
   list(APPEND SOURCE_FILES ${ANDROID_CORE_SOURCES} ${ANDROID_NDK}/sources/android/cpufeatures/cpu-features.c)
+  set_property(SOURCE "${ANDROID_NDK}/sources/android/cpufeatures/cpu-features.c" APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-declaration-after-statement")
 
   if(SDL_MISC)
     file(GLOB ANDROID_MISC_SOURCES ${SDL2_SOURCE_DIR}/src/misc/android/*.c)