use [[gnu::...]] attributes

src/lib/dbus/UDisks2.cxx

@@ -7,7 +7,6 @@
 #include "ObjectManager.hxx"
 #include "util/SpanCast.hxx"
 #include "util/StringAPI.hxx"
-#include "util/Compiler.h"
 
 #include <functional>
 #include <stdexcept>
@@ -15,7 +14,7 @@
 namespace UDisks2 {
 
 template<typename I>
-gcc_pure
+[[gnu::pure]]
 static const char *
 CheckString(I &&i) noexcept
 {
@@ -26,7 +25,7 @@ CheckString(I &&i) noexcept
 }
 
 template<typename I>
-gcc_pure
+[[gnu::pure]]
 static std::string_view
 CheckRecursedByteArrayToString(I &&i) noexcept
 {
@@ -38,7 +37,7 @@ CheckRecursedByteArrayToString(I &&i) noexcept
 }
 
 template<typename I>
-gcc_pure
+[[gnu::pure]]
 static std::string_view
 CheckByteArrayToString(I &&i) noexcept
 {
@@ -49,7 +48,7 @@ CheckByteArrayToString(I &&i) noexcept
 }
 
 template<typename I>
-gcc_pure
+[[gnu::pure]]
 static std::string_view
 CheckByteArrayArrayFrontToString(I &&i) noexcept
 {

src/lib/nfs/FileReader.hxx

@@ -7,7 +7,6 @@
 #include "Lease.hxx"
 #include "Callback.hxx"
 #include "event/InjectEvent.hxx"
-#include "util/Compiler.h"
 
 #include <cstddef>
 #include <cstdint>

src/lib/sqlite/Util.hxx

@@ -4,7 +4,6 @@
 #ifndef MPD_SQLITE_UTIL_HXX
 #define MPD_SQLITE_UTIL_HXX
 
-#include "util/Compiler.h"
 #include "Error.hxx"
 
 #include <sqlite3.h>

src/lib/upnp/Action.hxx

@@ -4,8 +4,6 @@
 #ifndef MPD_UPNP_ACTION_HXX
 #define MPD_UPNP_ACTION_HXX
 
-#include "util/Compiler.h"
-
 #include <upnptools.h>
 
 static constexpr unsigned

src/lib/xiph/FlacIOHandle.cxx

@@ -3,7 +3,6 @@
 
 #include "FlacIOHandle.hxx"
 #include "Log.hxx"
-#include "util/Compiler.h"
 #include "system/Error.hxx"
 
 #include <cerrno>

src/lib/xiph/FlacMetadataIterator.hxx

@@ -4,8 +4,6 @@
 #ifndef MPD_FLAC_METADATA_ITERATOR_HXX
 #define MPD_FLAC_METADATA_ITERATOR_HXX
 
-#include "util/Compiler.h"
-
 #include <FLAC/metadata.h>
 
 class FlacMetadataIterator {
@@ -31,7 +29,7 @@ public:
 		return ::FLAC__metadata_iterator_next(iterator);
 	}
 
-	gcc_pure
+	[[gnu::pure]]
 	FLAC__StreamMetadata *GetBlock() noexcept {
 		return ::FLAC__metadata_iterator_get_block(iterator);
 	}

src/lib/xiph/FlacStreamMetadata.cxx

@@ -59,7 +59,7 @@ flac_scan_comments(const FLAC__StreamMetadata_VorbisComment *comment,
 		ScanVorbisComment(ToStringView(comment->comments[i]), handler);
 }
 
-gcc_pure
+[[gnu::pure]]
 static inline SongTime
 flac_duration(const FLAC__StreamMetadata_StreamInfo *stream_info) noexcept
 {