gcov: add new option -t that prints output to stdout (PR gcov-profile/84846).

2018-05-18  Martin Liska  <mliska@suse.cz>

	PR gcov-profile/84846
	* gcov.c (print_usage): Add new -t option.
	(process_args): Handle the option.
	(generate_results): Use stdout as output when requested by
	the option.
2018-05-18  Martin Liska  <mliska@suse.cz>

	PR gcov-profile/84846
	* doc/gcov.texi: Document -t option of gcov tool.

From-SVN: r260361

gcc/ChangeLog

 2018-05-18  Martin Liska  <mliska@suse.cz>
 
 	PR gcov-profile/84846
+	* doc/gcov.texi: Document -t option of gcov tool.
+
+2018-05-18  Martin Liska  <mliska@suse.cz>
+
+	PR gcov-profile/84846
+	* gcov.c (print_usage): Add new -t option.
+	(process_args): Handle the option.
+	(generate_results): Use stdout as output when requested by
+	the option.
+
+2018-05-18  Martin Liska  <mliska@suse.cz>
+
+	PR gcov-profile/84846
 	* coverage.c (coverage_init): Write PWD to .gcno file.
 	* doc/gcov.texi: Document how working directory is printed.
 	* gcov-dump.c (dump_gcov_file): Print PWD.

gcc/doc/gcov.texi

@@ -134,6 +134,7 @@ gcov [@option{-v}|@option{--version}] [@option{-h}|@option{--help}]
      [@option{-p}|@option{--preserve-paths}]
      [@option{-r}|@option{--relative-only}]
      [@option{-s}|@option{--source-prefix} @var{directory}]
+     [@option{-t}|@option{--stdout}]
      [@option{-u}|@option{--unconditional-branches}]
      [@option{-x}|@option{--hash-filenames}]
      @var{files}
@@ -319,6 +320,10 @@ directory, and the pathname to the source directory is not wanted when
 determining the output file names.  Note that this prefix detection is
 applied before determining whether the source file is absolute.
 
+@item -t
+@itemx --stdout
+Output to standard output instead of output files.
+
 @item -u
 @itemx --unconditional-branches
 When branch probabilities are given, include those of unconditional branches.

gcc/gcov.c

@@ -462,6 +462,10 @@ static int flag_unconditional = 0;
 
 static int flag_gcov_file = 1;
 
+/* Output to stdout instead to a gcov file.  */
+
+static int flag_use_stdout = 0;
+
 /* Output progress indication if this is true.  This is off by default
    and can be turned on by the -d option.  */
 
@@ -831,6 +835,7 @@ print_usage (int error_p)
   fnotice (file, "  -p, --preserve-paths            Preserve all pathname components\n");
   fnotice (file, "  -r, --relative-only             Only show data for relative sources\n");
   fnotice (file, "  -s, --source-prefix DIR         Source prefix to elide\n");
+  fnotice (file, "  -t, --stdout                    Output to stdout instead of a file\n");
   fnotice (file, "  -u, --unconditional-branches    Show unconditional branch counts too\n");
   fnotice (file, "  -v, --version                   Print version number, then exit\n");
   fnotice (file, "  -w, --verbose                   Print verbose informations\n");
@@ -874,6 +879,7 @@ static const struct option options[] =
   { "object-directory",     required_argument, NULL, 'o' },
   { "object-file",          required_argument, NULL, 'o' },
   { "source-prefix",        required_argument, NULL, 's' },
+  { "stdout",		    no_argument,       NULL, 't' },
   { "unconditional-branches", no_argument,     NULL, 'u' },
   { "display-progress",     no_argument,       NULL, 'd' },
   { "hash-filenames",	    no_argument,       NULL, 'x' },
@@ -888,7 +894,7 @@ process_args (int argc, char **argv)
 {
   int opt;
 
-  const char *opts = "abcdfhijklmno:prs:uvwx";
+  const char *opts = "abcdfhijklmno:prs:tuvwx";
   while ((opt = getopt_long (argc, argv, opts, options, NULL)) != -1)
     {
       switch (opt)
@@ -952,6 +958,9 @@ process_args (int argc, char **argv)
 	case 'w':
 	  flag_verbose = 1;
 	  break;
+	case 't':
+	  flag_use_stdout = 1;
+	  break;
 	case 'v':
 	  print_version ();
 	  /* print_version will exit.  */
@@ -1293,7 +1302,7 @@ generate_results (const char *file_name)
 	file_name = canonicalize_name (file_name);
     }
 
-  if (flag_gcov_file && flag_intermediate_format)
+  if (flag_gcov_file && flag_intermediate_format && !flag_use_stdout)
     {
       /* Open the intermediate file.  */
       gcov_intermediate_filename = get_gcov_intermediate_filename (file_name);
@@ -1325,7 +1334,9 @@ generate_results (const char *file_name)
 	}
 
       accumulate_line_counts (src);
-      function_summary (&src->coverage, "File");
+
+      if (!flag_use_stdout)
+	function_summary (&src->coverage, "File");
       total_lines += src->coverage.lines;
       total_executed += src->coverage.lines_executed;
       if (flag_gcov_file)
@@ -1333,14 +1344,25 @@ generate_results (const char *file_name)
 	  if (flag_intermediate_format)
 	    /* Output the intermediate format without requiring source
 	       files.  This outputs a section to a *single* file.  */
-	    output_intermediate_file (gcov_intermediate_file, src);
+	    output_intermediate_file ((flag_use_stdout
+				       ? stdout : gcov_intermediate_file), src);
 	  else
-	    output_gcov_file (file_name, src);
-	  fnotice (stdout, "\n");
+	    {
+	      if (flag_use_stdout)
+		{
+		  if (src->coverage.lines)
+		    output_lines (stdout, src);
+		}
+	      else
+		{
+		  output_gcov_file (file_name, src);
+		  fnotice (stdout, "\n");
+		}
+	    }
 	}
     }
 
-  if (flag_gcov_file && flag_intermediate_format)
+  if (flag_gcov_file && flag_intermediate_format && !flag_use_stdout)
     {
       /* Now we've finished writing the intermediate file.  */
       fclose (gcov_intermediate_file);