Update IDF to 9a26296

tools/sdk/include/newlib/sys/features.h

@@ -210,6 +210,12 @@ extern "C" {
 
 #endif /* __CYGWIN__ */
 
+/* ESP-IDF-specific: enable pthreads support */
+#ifdef __XTENSA__
+#define _POSIX_THREADS                          1
+#define _UNIX98_THREAD_MUTEX_ATTRIBUTES         1
+#endif
+
 /* Per the permission given in POSIX.1-2008 section 2.2.1, define
  * _POSIX_C_SOURCE if _XOPEN_SOURCE is defined and _POSIX_C_SOURCE is not.
  * (_XOPEN_SOURCE indicates that XSI extensions are desired by an application.)

tools/sdk/include/newlib/sys/sched.h

@@ -58,6 +58,8 @@ struct sched_param {
 #endif
 };
 
+int sched_yield( void );
+
 #ifdef __cplusplus
 }
 #endif

tools/sdk/include/newlib/sys/time.h

@@ -20,7 +20,7 @@ struct timeval {
 };
 
 /* BSD time macros used by RTEMS code */
-#if defined (__rtems__) || defined (__CYGWIN__)
+#if defined (__rtems__) || defined (__CYGWIN__) || defined(__XTENSA__)
 
 /* Convenience macros for operations on timevals.
    NOTE: `timercmp' does not work for >= or <=.  */