[pph] Disable PPH generation if there are errors (issue5580043)

[Diego Novillo]

A small fixlet to deal with files that have errors in them.  When we
are about to generate PPH output, we check if there have been errors
emitted for the file.  If so, we disable PPH generation.

Testing this, I found that we were not clearing pph_out_stream
when disabling PPH.  Fixed.

2012-01-26   Diego Novillo  <dnovi...@google.com>

        * pph-core.c (pph_stream_close_1): Add a newline to fprintf call.
        (pph_finish): If there were errors during compilation,
        disable PPH generation.
        * pph-out.c (pph_disable_output): Also set pph_out_stream to
        NULL.

diff --git a/gcc/cp/pph-core.c b/gcc/cp/pph-core.c
index a9a8bc2..3f958de 100644
--- a/gcc/cp/pph-core.c
+++ b/gcc/cp/pph-core.c
@@ -1190,7 +1190,7 @@ pph_stream_close_1 (pph_stream *stream, bool flush_p)
   if (stream->write_p && !flush_p)
     {
       if (flag_pph_tracer >= 1)
-       fprintf (pph_logfile, "PPH: Removing %s", stream->name);
+       fprintf (pph_logfile, "PPH: Removing %s\n", stream->name);
       unlink (stream->name);
     }
 
@@ -1423,6 +1423,10 @@ pph_streamer_finish (void)
 void
 pph_finish (void)
 {
+  /* If we found errors during compilation, disable PPH generation.  */
+  if (errorcount || sorrycount)
+    pph_disable_output ();
+
   /* Finalize the streamer.  */
   pph_streamer_finish ();
 
diff --git a/gcc/cp/pph-out.c b/gcc/cp/pph-out.c
index f7839d2..69530aa 100644
--- a/gcc/cp/pph-out.c
+++ b/gcc/cp/pph-out.c
@@ -2847,6 +2847,7 @@ pph_disable_output (void)
 
   pph_stream_close_no_flush (pph_out_stream);
   pph_out_file = NULL;
+  pph_out_stream = NULL;
 }
 
 #include "gt-cp-pph-out.h"

--
This patch is available for review at http://codereview.appspot.com/5580043