more [[gnu::...]] attributes

src/lib/icu/Win32.hxx

@@ -20,8 +20,6 @@
 #ifndef MPD_ICU_WIN32_HXX
 #define MPD_ICU_WIN32_HXX
 
-#include "util/Compiler.h"
-
 #include <string_view>
 
 class AllocatedString;
@@ -30,14 +28,14 @@ template<typename T> class BasicAllocatedString;
 /**
  * Throws std::system_error on error.
  */
-gcc_pure gcc_nonnull_all
+[[gnu::pure]]
 AllocatedString
 WideCharToMultiByte(unsigned code_page, std::wstring_view src);
 
 /**
  * Throws std::system_error on error.
  */
-gcc_pure gcc_nonnull_all
+[[gnu::pure]]
 BasicAllocatedString<wchar_t>
 MultiByteToWideChar(unsigned code_page, std::string_view src);