[Bug fortran/19182] Error messages seem to be printed slower

[schnetter at aei dot mpg dot de]

------- Additional Comments From schnetter at aei dot mpg dot de  2004-12-28 22:31 -------
I didn't try the putc vs. fputc change, but the patch below makes all the 
difference: 
 
$ cvs diff -u error.c 
Index: error.c 
=================================================================== 
RCS file: /cvs/gcc/gcc/gcc/fortran/error.c,v 
retrieving revision 1.8 
diff -u -r1.8 error.c 
--- error.c     16 Sep 2004 16:00:41 -0000      1.8 
+++ error.c     28 Dec 2004 22:26:52 -0000 
@@ -74,6 +74,13 @@ 
 static void 
 error_char (char c) 
 { 
+  static int bufset = 0; 
+  if (! bufset) 
+    { 
+      setvbuf (stderr, 0, _IOLBF, 0); 
+      bufset = 1; 
+    } 
+ 
   if (buffer_flag) 
     { 
       if (use_warning_buffer) 
 
The call to setvbuf switches to line buffering, meaning that stderr is flushed 
only after every line and not after every character.  I assume that cc1 (as 
opposed to f951) switches to line buffered stderr at some time, or else 
outputs its error messages in some other way which is equivalent to some 
internal buffering.  f951 outputs its messages character by character, which 
leads to an unnecessary overhead. 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19182