prelude: Define thread_local

2 files changed, 17 insertions, 11 deletions

diff --git a/src/prelude.h b/src/prelude.h
index 9aaec04..59fa645 100644
--- a/src/prelude.h
+++ b/src/prelude.h
@@ -19,10 +19,24 @@
 // Get the static_assert() definition as well as __GLIBC__
 #include <assert.h>
 
+// Get the convenience macros that became standard spellings in C23
 #if __STDC_VERSION__ < C23
-#  include <stdalign.h>
-#  include <stdbool.h>
-#endif
+
+/** _Alignas(), _Alignof() => alignas(), alignof() */
+#include <stdalign.h>
+/** _Bool => bool, true, false */
+#include <stdbool.h>
+
+/**
+ * C23 deprecates `noreturn void` in favour of `[[noreturn]] void`, so we expose
+ * _noreturn instead with the other attributes.
+ */
+// #include <stdnoreturn.h>
+
+/** Part of <threads.h>, but we don't use anything else from it. */
+#define thread_local _Thread_local
+
+#endif // !C23
 
 // bfs packaging configuration
 
diff --git a/src/thread.h b/src/thread.h
index db11bd8..dbf11ce 100644
--- a/src/thread.h
+++ b/src/thread.h
@@ -11,14 +11,6 @@
 #include "prelude.h"
 #include <pthread.h>
 
-#if __STDC_VERSION__ < C23 && !defined(thread_local)
-#  if BFS_USE_THREADS_H
-#    include <threads.h>
-#  else
-#    define thread_local _Thread_local
-#  endif
-#endif
-
 /** Thread entry point type. */
 typedef void *thread_fn(void *arg);