Update _POSIX_THREAD_XX macro definitions (#494)

This is a follow-up to #356

Author: kateinoigakukun

expected/wasm32-wasip1-threads/predefined-macros.txt

@@ -2182,12 +2182,9 @@
 #define _POSIX_SYMLINK_MAX 255
 #define _POSIX_SYMLOOP_MAX 8
 #define _POSIX_THREADS _POSIX_VERSION
-#define _POSIX_THREAD_ATTR_STACKADDR _POSIX_VERSION
 #define _POSIX_THREAD_ATTR_STACKSIZE _POSIX_VERSION
-#define _POSIX_THREAD_CPUTIME _POSIX_VERSION
 #define _POSIX_THREAD_DESTRUCTOR_ITERATIONS 4
 #define _POSIX_THREAD_KEYS_MAX 128
-#define _POSIX_THREAD_PRIORITY_SCHEDULING _POSIX_VERSION
 #define _POSIX_THREAD_PROCESS_SHARED _POSIX_VERSION
 #define _POSIX_THREAD_SAFE_FUNCTIONS _POSIX_VERSION
 #define _POSIX_THREAD_THREADS_MAX 64

expected/wasm32-wasip1/predefined-macros.txt

@@ -2147,14 +2147,8 @@
 #define _POSIX_STREAM_MAX 8
 #define _POSIX_SYMLINK_MAX 255
 #define _POSIX_SYMLOOP_MAX 8
-#define _POSIX_THREAD_ATTR_STACKADDR _POSIX_VERSION
-#define _POSIX_THREAD_ATTR_STACKSIZE _POSIX_VERSION
-#define _POSIX_THREAD_CPUTIME _POSIX_VERSION
 #define _POSIX_THREAD_DESTRUCTOR_ITERATIONS 4
 #define _POSIX_THREAD_KEYS_MAX 128
-#define _POSIX_THREAD_PRIORITY_SCHEDULING _POSIX_VERSION
-#define _POSIX_THREAD_PROCESS_SHARED _POSIX_VERSION
-#define _POSIX_THREAD_SAFE_FUNCTIONS _POSIX_VERSION
 #define _POSIX_THREAD_THREADS_MAX 64
 #define _POSIX_TIMEOUTS _POSIX_VERSION
 #define _POSIX_TIMERS _POSIX_VERSION

expected/wasm32-wasip2/predefined-macros.txt

@@ -2298,14 +2298,8 @@
 #define _POSIX_STREAM_MAX 8
 #define _POSIX_SYMLINK_MAX 255
 #define _POSIX_SYMLOOP_MAX 8
-#define _POSIX_THREAD_ATTR_STACKADDR _POSIX_VERSION
-#define _POSIX_THREAD_ATTR_STACKSIZE _POSIX_VERSION
-#define _POSIX_THREAD_CPUTIME _POSIX_VERSION
 #define _POSIX_THREAD_DESTRUCTOR_ITERATIONS 4
 #define _POSIX_THREAD_KEYS_MAX 128
-#define _POSIX_THREAD_PRIORITY_SCHEDULING _POSIX_VERSION
-#define _POSIX_THREAD_PROCESS_SHARED _POSIX_VERSION
-#define _POSIX_THREAD_SAFE_FUNCTIONS _POSIX_VERSION
 #define _POSIX_THREAD_THREADS_MAX 64
 #define _POSIX_TIMEOUTS _POSIX_VERSION
 #define _POSIX_TIMERS _POSIX_VERSION

libc-top-half/musl/include/unistd.h

@@ -338,13 +338,19 @@ pid_t gettid(void);
 
 #if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
 #define _POSIX_THREADS          _POSIX_VERSION
-#endif
 #define _POSIX_THREAD_PROCESS_SHARED _POSIX_VERSION
 #define _POSIX_THREAD_SAFE_FUNCTIONS _POSIX_VERSION
+#endif
+#if defined(__wasilibc_unmodified_upstream) /* wasi-libc doesn't provide pthread_attr_{get,set}stackaddr */
 #define _POSIX_THREAD_ATTR_STACKADDR _POSIX_VERSION
+#endif
+#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
 #define _POSIX_THREAD_ATTR_STACKSIZE _POSIX_VERSION
+#endif
+#if defined(__wasilibc_unmodified_upstream) /* WASI has no scheduling control, and wasi-libc doesn't provide pthread_getcpuclockid */
 #define _POSIX_THREAD_PRIORITY_SCHEDULING _POSIX_VERSION
 #define _POSIX_THREAD_CPUTIME   _POSIX_VERSION
+#endif
 #define _POSIX_TIMERS           _POSIX_VERSION
 #define _POSIX_TIMEOUTS         _POSIX_VERSION
 #define _POSIX_MONOTONIC_CLOCK  _POSIX_VERSION