Add support for a minimal version of libgfortran for accelerator targets.

	* Makefile.am (AM_CFLAGS): Add -DLIBGFOR_MINIMAL if LIBGFOR_MINIMAL.
        (gfor_io_src, gfor_heper_src, gfor_src): Split into minimal and
        always included sources.
        * Makefile.in: Regenerate.
        * configure.ac (LIBGFOR_MINIMAL): New AM_CONDITIONAL.
        * configure: Regenerate.
        * caf/single.c (caf_runtime_error): Don't print messages if
        LIBGFOR_MINIMAL.
        * runtime/compile_options.c (fatal_error_in_progress,
        show_signal, backtrace_handler, maybe_find_addr2line): Guard with
        !defined LIBGFOR_MINIMAL.
        (set_options): Likewise for the backtrace code.
        * runtime/minimal.c: New file.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218170 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 162 insertions, 1 deletions

diff --git a/libgfortran/runtime/compile_options.c b/libgfortran/runtime/compile_options.c
index 748ac23354d..6f78f9cf24a 100644
--- a/libgfortran/runtime/compile_options.c
+++ b/libgfortran/runtime/compile_options.c
@@ -29,7 +29,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 /* Useful compile-time options will be stored in here.  */
 compile_options_t compile_options;
 
-
+#ifndef LIBGFOR_MINIMAL
 volatile sig_atomic_t fatal_error_in_progress = 0;
 
 
@@ -146,6 +146,7 @@ maybe_find_addr2line (void)
   if (options.backtrace == -1)
     find_addr2line ();
 }
+#endif
 
 /* Set the usual compile-time options.  */
 extern void set_options (int , int []);
@@ -176,6 +177,7 @@ set_options (int num, int options[])
   if (num >= 9)
     compile_options.fpe_summary = options[8];
 
+#ifndef LIBGFOR_MINIMAL
   /* If backtrace is required, we set signal handlers on the POSIX
      2001 signals with core action.  */
   if (compile_options.backtrace)
@@ -212,6 +214,7 @@ set_options (int num, int options[])
 
       maybe_find_addr2line ();
     }
+#endif
 }
 
 
diff --git a/libgfortran/runtime/minimal.c b/libgfortran/runtime/minimal.c
new file mode 100644
index 00000000000..8dede63a08e
--- /dev/null
+++ b/libgfortran/runtime/minimal.c
@@ -0,0 +1,158 @@
+/* Copyright (C) 2002-2014 Free Software Foundation, Inc.
+   Contributed by Andy Vaught and Paul Brook <paul@nowt.org>
+
+This file is part of the GNU Fortran runtime library (libgfortran).
+
+Libgfortran 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.
+
+Libgfortran 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "libgfortran.h"
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <errno.h>
+
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+/* Stupid function to be sure the constructor is always linked in, even
+   in the case of static linking.  See PR libfortran/22298 for details.  */
+void
+stupid_function_name_for_static_linking (void)
+{
+  return;
+}
+
+options_t options;
+
+/* This will be 0 for little-endian
+   machines and 1 for big-endian machines.
+
+   Currently minimal libgfortran only runs on little-endian devices
+   which don't support constructors so this is just a constant.  */
+int big_endian = 0;
+
+static int argc_save;
+static char **argv_save;
+
+static const char *exe_path;
+
+/* recursion_check()-- It's possible for additional errors to occur
+ * during fatal error processing.  We detect this condition here and
+ * exit with code 4 immediately. */
+
+#define MAGIC 0x20DE8101
+
+static void
+recursion_check (void)
+{
+  static int magic = 0;
+
+  /* Don't even try to print something at this point */
+  if (magic == MAGIC)
+    sys_abort ();
+
+  magic = MAGIC;
+}
+
+#define STRERR_MAXSZ 256
+
+void
+os_error (const char *message)
+{
+  recursion_check ();
+  printf ("Operating system error: ");
+  printf ("%s\n", message);
+  exit (1);
+}
+iexport(os_error);
+
+void
+runtime_error (const char *message, ...)
+{
+  va_list ap;
+
+  recursion_check ();
+  printf ("Fortran runtime error: ");
+  va_start (ap, message);
+  vprintf (message, ap);
+  va_end (ap);
+  printf ("\n");
+  exit (2);
+}
+iexport(runtime_error);
+
+/* void runtime_error_at()-- These are errors associated with a
+ * run time error generated by the front end compiler.  */
+
+void
+runtime_error_at (const char *where, const char *message, ...)
+{
+  va_list ap;
+
+  recursion_check ();
+  printf ("Fortran runtime error: ");
+  va_start (ap, message);
+  vprintf (message, ap);
+  va_end (ap);
+  printf ("\n");
+  exit (2);
+}
+iexport(runtime_error_at);
+
+/* Return the full path of the executable.  */
+char *
+full_exe_path (void)
+{
+  return (char *) exe_path;
+}
+
+
+/* Set the saved values of the command line arguments.  */
+
+void
+set_args (int argc, char **argv)
+{
+  argc_save = argc;
+  argv_save = argv;
+  exe_path = argv[0];
+}
+iexport(set_args);
+
+
+/* Retrieve the saved values of the command line arguments.  */
+
+void
+get_args (int *argc, char ***argv)
+{
+  *argc = argc_save;
+  *argv = argv_save;
+}
+
+/* sys_abort()-- Terminate the program showing backtrace and dumping
+   core.  */
+
+void
+sys_abort (void)
+{
+  printf ("Abort called.\n");
+  abort();
+}