--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/collect-utils.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,228 @@
+/* Utility functions used by tools like collect2 and lto-wrapper.
+   Copyright (C) 2009-2017 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "intl.h"
+#include "diagnostic.h"
+#include "obstack.h"
+#include "opts.h"
+#include "options.h"
+#include "simple-object.h"
+#include "lto-section-names.h"
+#include "collect-utils.h"
+
+static char *response_file;
+
+bool debug;
+bool verbose;
+bool save_temps;
+
+
+/* Notify user of a non-error.  */
+void
+notice (const char *cmsgid, ...)
+{
+  va_list ap;
+
+  va_start (ap, cmsgid);
+  vfprintf (stderr, _(cmsgid), ap);
+  va_end (ap);
+}
+
+void
+fatal_signal (int signum)
+{
+  signal (signum, SIG_DFL);
+  utils_cleanup (true);
+  /* Get the same signal again, this time not handled,
+     so its normal effect occurs.  */
+  kill (getpid (), signum);
+}
+
+/* Wait for a process to finish, and exit if a nonzero status is found.  */
+
+int
+collect_wait (const char *prog, struct pex_obj *pex)
+{
+  int status;
+
+  if (!pex_get_status (pex, 1, &status))
+    fatal_error (input_location, "can't get program status: %m");
+  pex_free (pex);
+
+  if (response_file && !save_temps)
+    {
+      unlink (response_file);
+      response_file = NULL;
+    }
+
+  if (status)
+    {
+      if (WIFSIGNALED (status))
+	{
+	  int sig = WTERMSIG (status);
+	  fatal_error (input_location, "%s terminated with signal %d [%s]%s",
+		       prog, sig, strsignal (sig),
+		       WCOREDUMP (status) ? ", core dumped" : "");
+	}
+
+      if (WIFEXITED (status))
+	return WEXITSTATUS (status);
+    }
+  return 0;
+}
+
+void
+do_wait (const char *prog, struct pex_obj *pex)
+{
+  int ret = collect_wait (prog, pex);
+  if (ret != 0)
+    fatal_error (input_location, "%s returned %d exit status", prog, ret);
+}
+
+
+/* Execute a program, and wait for the reply.  */
+
+struct pex_obj *
+collect_execute (const char *prog, char **argv, const char *outname,
+		 const char *errname, int flags, bool use_atfile)
+{
+  struct pex_obj *pex;
+  const char *errmsg;
+  int err;
+  char *response_arg = NULL;
+  char *response_argv[3];
+
+  if (use_atfile && argv[0] != NULL)
+    {
+      /* If using @file arguments, create a temporary file and put the
+         contents of argv into it.  Then change argv to an array corresponding
+         to a single argument @FILE, where FILE is the temporary filename.  */
+
+      char **current_argv = argv + 1;
+      char *argv0 = argv[0];
+      int status;
+      FILE *f;
+
+      /* Note: we assume argv contains at least one element; this is
+         checked above.  */
+
+      response_file = make_temp_file ("");
+
+      f = fopen (response_file, "w");
+
+      if (f == NULL)
+        fatal_error (input_location, "could not open response file %s",
+		     response_file);
+
+      status = writeargv (current_argv, f);
+
+      if (status)
+        fatal_error (input_location, "could not write to response file %s",
+		     response_file);
+
+      status = fclose (f);
+
+      if (EOF == status)
+        fatal_error (input_location, "could not close response file %s",
+		     response_file);
+
+      response_arg = concat ("@", response_file, NULL);
+      response_argv[0] = argv0;
+      response_argv[1] = response_arg;
+      response_argv[2] = NULL;
+
+      argv = response_argv;
+    }
+
+  if (verbose || debug)
+    {
+      char **p_argv;
+      const char *str;
+
+      if (argv[0])
+	fprintf (stderr, "%s", argv[0]);
+      else
+	notice ("[cannot find %s]", prog);
+
+      for (p_argv = &argv[1]; (str = *p_argv) != (char *) 0; p_argv++)
+	fprintf (stderr, " %s", str);
+
+      fprintf (stderr, "\n");
+    }
+
+  fflush (stdout);
+  fflush (stderr);
+
+  /* If we cannot find a program we need, complain error.  Do this here
+     since we might not end up needing something that we could not find.  */
+
+  if (argv[0] == 0)
+    fatal_error (input_location, "cannot find '%s'", prog);
+
+  pex = pex_init (0, "collect2", NULL);
+  if (pex == NULL)
+    fatal_error (input_location, "pex_init failed: %m");
+
+  errmsg = pex_run (pex, flags, argv[0], argv, outname,
+		    errname, &err);
+  if (errmsg != NULL)
+    {
+      if (err != 0)
+	{
+	  errno = err;
+	  fatal_error (input_location, "%s: %m", _(errmsg));
+	}
+      else
+	fatal_error (input_location, errmsg);
+    }
+
+  free (response_arg);
+
+  return pex;
+}
+
+void
+fork_execute (const char *prog, char **argv, bool use_atfile)
+{
+  struct pex_obj *pex;
+
+  pex = collect_execute (prog, argv, NULL, NULL,
+			 PEX_LAST | PEX_SEARCH, use_atfile);
+  do_wait (prog, pex);
+}
+
+/* Delete tempfiles.  */
+
+void
+utils_cleanup (bool from_signal)
+{
+  static bool cleanup_done = false;
+
+  if (cleanup_done)
+    return;
+
+  /* Setting cleanup_done prevents an infinite loop if one of the
+     calls to maybe_unlink fails. */
+  cleanup_done = true;
+
+  tool_cleanup (from_signal);
+}