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

src/lib/alsa/Format.hxx

@@ -43,7 +43,7 @@
  * enum.  Returns SND_PCM_FORMAT_UNKNOWN if there is no according ALSA
  * PCM format.
  */
-gcc_const
+[[gnu::const]]
 inline snd_pcm_format_t
 ToAlsaPcmFormat(SampleFormat sample_format) noexcept
 {
@@ -82,7 +82,7 @@ ToAlsaPcmFormat(SampleFormat sample_format) noexcept
  * Determine the byte-swapped PCM format.  Returns
  * SND_PCM_FORMAT_UNKNOWN if the format cannot be byte-swapped.
  */
-gcc_const
+[[gnu::const]]
 inline snd_pcm_format_t
 ByteSwapAlsaPcmFormat(snd_pcm_format_t fmt) noexcept
 {
@@ -123,8 +123,7 @@ ByteSwapAlsaPcmFormat(snd_pcm_format_t fmt) noexcept
  * Check if there is a "packed" version of the give PCM format.
  * Returns SND_PCM_FORMAT_UNKNOWN if not.
  */
-gcc_const
-inline snd_pcm_format_t
+constexpr snd_pcm_format_t
 PackAlsaPcmFormat(snd_pcm_format_t fmt) noexcept
 {
 	switch (fmt) {

src/lib/alsa/Version.cxx

@@ -23,7 +23,7 @@
 
 #include <stdlib.h>
 
-gcc_pure
+[[gnu::pure]]
 static uint_least32_t
 ParseAlsaVersion(const char *p) noexcept
 {

src/lib/alsa/Version.hxx

@@ -20,8 +20,6 @@
 #ifndef MPD_ALSA_VERSION_HXX
 #define MPD_ALSA_VERSION_HXX
 
-#include "util/Compiler.h"
-
 #include <cstdint>
 
 static constexpr uint_least32_t
@@ -35,7 +33,7 @@ MakeAlsaVersion(uint_least32_t major, uint_least32_t minor,
  * Wrapper for snd_asoundlib_version() which translates the resulting
  * string to an integer constructed with MakeAlsaVersion().
  */
-gcc_const
+[[gnu::const]]
 uint_least32_t
 GetRuntimeAlsaVersion() noexcept;