fix too-early-loggin-use crash

maestro/logging.c

@@ -208,7 +208,8 @@ mstro__ensure_threadid(void)
     /* valgrind users: this will leak. Sorry :) (we could use C11 _Tread_local instead, but need to check all compilers we care about do it well) */
     char *tmp = malloc(16+2);
     if(tmp==NULL) {
-      ERR("Failed to allocate thread-identifier\n");
+      /* cannot use our logging infrastructure yet, so use stderr */
+      fprintf(stderr, "Failed to allocate thread-identifier\n");
       abort();
     }
 
@@ -238,11 +239,17 @@ mstro__ensure_threadid(void)
 
     int s = pthread_setspecific(g_thread_descriptor_key, tid);
     if(s!=0) {
-      ERR("Failed to set thread identifier: %d (%s)\n",
-          errno, strerror(errno));
+      /* cannot use our logging infrastructure yet, so use stderr */
+      if(s==EINVAL) {
+        fprintf(stderr, "Failed to set thread identifier; likely mstro_init has not been called, proceeding with caution\n");
+        tid=0;
+      } else {
+        fprintf(stderr, "Failed to set thread identifier: %d (%s) (errno %d = %s)\n",
+               s, strerror(s), errno, strerror(errno));
         abort();
       }
     }
+  }
   return tid;
 }