fix(linux): prevent build error on MacOS and optimize buffer usage on Linux

components/console/linenoise/linenoise.c

@@ -107,7 +107,11 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <stdio.h>
-#include <stdio_ext.h>
+#if !CONFIG_IDF_TARGET_LINUX
+// On Linux, we don't need __fbufsize (see comments below), and
+// __fbufsize not available on MacOS (which is also considered "Linux" target)
+#include <stdio_ext.h> // for __fbufsize
+#endif
 #include <errno.h>
 #include <string.h>
 #include <stdlib.h>
@@ -216,9 +220,14 @@ bool linenoiseIsDumbMode(void) {
 }
 
 static void flushWrite(void) {
+// On Linux, we set stdout to unbuffered mode to facilitate interaction with tools.
+// Performance on Linux is not considered as critical as on chip targets. Additionally,
+// MacOS does not have __fbufsize.
+#if !CONFIG_IDF_TARGET_LINUX
     if (__fbufsize(stdout) > 0) {
         fflush(stdout);
     }
+#endif
     fsync(fileno(stdout));
 }
 

components/freertos/FreeRTOS-Kernel/portable/linux/port_idf.c

@@ -50,9 +50,9 @@ static void main_task(void* args)
 
 int main(int argc, const char **argv)
 {
-    // This makes sure that stdio is flushed after each '\n' so that idf.py monitor
-    // reads the program output on time.
-    setvbuf(stdout, NULL, _IOLBF, 0);
+    // This makes sure that stdio is always syncronized so that idf.py monitor
+    // and other tools read text output on time.
+    setvbuf(stdout, NULL, _IONBF, 0);
 
     usleep(1000);
     BaseType_t res = xTaskCreatePinnedToCore(&main_task, "main",