Index: gcc/fortran/intrinsic.c
===================================================================
--- gcc/fortran/intrinsic.c	(revision 147057)
+++ gcc/fortran/intrinsic.c	(working copy)
@@ -2553,6 +2553,15 @@
 	      gfc_check_dtime_etime_sub, NULL, gfc_resolve_dtime_sub,
 	      vl, BT_REAL, 4, REQUIRED, tm, BT_REAL, 4, REQUIRED);
 
+  add_sym_5s ("execute_command_line", GFC_ISYM_EXECUTE_COMMAND_LINE, NO_CLASS,
+	      BT_UNKNOWN, 0, GFC_STD_F2008,
+	      NULL, NULL, gfc_resolve_execute_command_line,
+	      "command", BT_CHARACTER, dc, REQUIRED,
+	      "wait", BT_LOGICAL, dl, OPTIONAL,
+	      "exitstat", BT_INTEGER, di, OPTIONAL,
+	      "cmdstat", BT_INTEGER, di, OPTIONAL,
+	      "cmdmsg", BT_CHARACTER, dc, OPTIONAL);
+
   add_sym_1s ("fdate", GFC_ISYM_FDATE, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_fdate_sub, NULL, gfc_resolve_fdate_sub,
 	      dt, BT_CHARACTER, dc, REQUIRED);
Index: gcc/fortran/intrinsic.h
===================================================================
--- gcc/fortran/intrinsic.h	(revision 147057)
+++ gcc/fortran/intrinsic.h	(working copy)
@@ -491,6 +491,7 @@
 void gfc_resolve_chmod_sub (gfc_code *);
 void gfc_resolve_cpu_time (gfc_code *);
 void gfc_resolve_ctime_sub (gfc_code *);
+void gfc_resolve_execute_command_line (gfc_code *);
 void gfc_resolve_exit (gfc_code *);
 void gfc_resolve_fdate_sub (gfc_code *);
 void gfc_resolve_flush (gfc_code *);
Index: gcc/fortran/gfortran.h
===================================================================
--- gcc/fortran/gfortran.h	(revision 147057)
+++ gcc/fortran/gfortran.h	(working copy)
@@ -359,6 +359,7 @@
   GFC_ISYM_ERFC,
   GFC_ISYM_ERFC_SCALED,
   GFC_ISYM_ETIME,
+  GFC_ISYM_EXECUTE_COMMAND_LINE,
   GFC_ISYM_EXIT,
   GFC_ISYM_EXP,
   GFC_ISYM_EXPONENT,
Index: gcc/fortran/iresolve.c
===================================================================
--- gcc/fortran/iresolve.c	(revision 147057)
+++ gcc/fortran/iresolve.c	(working copy)
@@ -3001,6 +3001,17 @@
 }
 
 
+/* Resolve the EXECUTE_COMMAND_LINE intrinsic subroutine.  */
+void
+gfc_resolve_execute_command_line (gfc_code *c)
+{
+  const char *name;
+  name = gfc_get_string (PREFIX ("execute_command_line_i%d"),
+			 gfc_default_integer_kind);
+  c->resolved_sym = gfc_get_intrinsic_sub_symbol (name);
+}
+
+
 /* Resolve the EXIT intrinsic subroutine.  */
 
 void
Index: libgfortran/intrinsics/execute_command_line.c
===================================================================
--- libgfortran/intrinsics/execute_command_line.c	(revision 0)
+++ libgfortran/intrinsics/execute_command_line.c	(revision 0)
@@ -0,0 +1,164 @@
+/* Implementation of the EXECUTE_COMMAND_LINE intrinsic.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+   Contributed by François-Xavier Coudert.
+
+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 <string.h>
+#include <stdbool.h>
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef  HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
+
+enum { EXEC_NOERROR = 0, EXEC_SYSTEMFAILED };
+static const char *cmdmsg_values[] =
+  { "", "Execution of child process impossible" };
+
+static void
+execute_command_line (const char *command, bool wait, int *exitstat,
+		      int *cmdstat, char *cmdmsg,
+		      gfc_charlen_type command_len,
+		      gfc_charlen_type cmdmsg_len)
+{
+  /* Transform the Fortran string to a C string.  */
+  char cmd[command_len + 1];
+  memcpy (cmd, command, command_len);
+  cmd[command_len] = '\0';
+
+  /* Flush all I/O units before executing the command.  */
+  flush_all_units();
+
+#if defined(HAVE_FORK)
+  if (!wait)
+    {
+      /* Asynchronous execution.  */
+      pid_t pid;
+
+      *cmdstat = 0;
+      if ((pid = fork()) < 0)
+	*cmdstat = EXEC_SYSTEMFAILED;
+      else if (pid == 0)
+	{
+	  /* Child process.  */
+	  int res = system (cmd);
+	  _exit (WIFEXITED(res) ? WEXITSTATUS(res) : res);
+	}
+    }
+  else
+#endif
+    {
+      /* Synchronous execution.  */
+      int res = system (cmd);
+
+      if (!wait)
+	*cmdstat = -2;
+      else if (res == -1)
+	*cmdstat = EXEC_SYSTEMFAILED;
+      else
+	{
+	  *cmdstat = 0;
+#if defined(WEXITSTATUS) && defined(WIFEXITED)
+	  *exitstat = WIFEXITED(res) ? WEXITSTATUS(res) : res;
+#else
+	  *exitstat = res;
+#endif
+	}
+    }
+
+  /* Now copy back to the Fortran string if needed.  */
+  if (*cmdstat > 0)
+    {
+      if (cmdmsg)
+	fstrcpy (cmdmsg, cmdmsg_len, cmdmsg_values[*cmdstat],
+		strlen (cmdmsg_values[*cmdstat]));
+      else
+	runtime_error ("Failure in EXECUTE_COMMAND_LINE: %s",
+		       cmdmsg_values[*cmdstat]);
+    }
+}
+
+
+extern void
+execute_command_line_i4 (const char *command, GFC_LOGICAL_4 *wait,
+			 GFC_INTEGER_4 *exitstat, GFC_INTEGER_4 *cmdstat,
+			 char *cmdmsg, gfc_charlen_type command_len,
+			 gfc_charlen_type cmdmsg_len);
+export_proto(execute_command_line_i4);
+
+void
+execute_command_line_i4 (const char *command, GFC_LOGICAL_4 *wait,
+			 GFC_INTEGER_4 *exitstat, GFC_INTEGER_4 *cmdstat,
+			 char *cmdmsg, gfc_charlen_type command_len,
+			 gfc_charlen_type cmdmsg_len)
+{
+  bool w = wait ? *wait : true;
+  int estat, estat_initial, cstat;
+
+  if (exitstat)
+    estat_initial = estat = *exitstat;
+
+  execute_command_line (command, w, &estat, &cstat, cmdmsg, command_len,
+			cmdmsg_len);
+
+  if (exitstat && estat != estat_initial)
+    *exitstat = estat;
+  if (cmdstat)
+    *cmdstat = cstat;
+}
+
+
+extern void
+execute_command_line_i8 (const char *command, GFC_LOGICAL_8 *wait,
+			 GFC_INTEGER_8 *exitstat, GFC_INTEGER_8 *cmdstat,
+			 char *cmdmsg, gfc_charlen_type command_len,
+			 gfc_charlen_type cmdmsg_len);
+export_proto(execute_command_line_i8);
+
+void
+execute_command_line_i8 (const char *command, GFC_LOGICAL_8 *wait,
+			 GFC_INTEGER_8 *exitstat, GFC_INTEGER_8 *cmdstat,
+			 char *cmdmsg, gfc_charlen_type command_len,
+			 gfc_charlen_type cmdmsg_len)
+{
+  bool w = wait ? *wait : true;
+  int estat, estat_initial, cstat;
+
+  if (exitstat)
+    estat_initial = estat = *exitstat;
+
+  execute_command_line (command, w, &estat, &cstat, cmdmsg, command_len,
+			cmdmsg_len);
+
+  if (exitstat && estat != estat_initial)
+    *exitstat = estat;
+  if (cmdstat)
+    *cmdstat = cstat;
+}
Index: libgfortran/gfortran.map
===================================================================
--- libgfortran/gfortran.map	(revision 147057)
+++ libgfortran/gfortran.map	(working copy)
@@ -1069,6 +1069,8 @@
     _gfortran_erfc_scaled_r16;
     _gfortran_erfc_scaled_r4;
     _gfortran_erfc_scaled_r8;
+    _gfortran_execute_command_line_i4;
+    _gfortran_execute_command_line_i8;
     _gfortran_pack_char4;
     _gfortran_pack_s_char4;
     _gfortran_reshape_char4;
Index: libgfortran/Makefile.am
===================================================================
--- libgfortran/Makefile.am	(revision 147057)
+++ libgfortran/Makefile.am	(working copy)
@@ -76,6 +76,7 @@
 intrinsics/eoshift2.c \
 intrinsics/erfc_scaled.c \
 intrinsics/etime.c \
+intrinsics/execute_command_line.c \
 intrinsics/exit.c \
 intrinsics/fnum.c \
 intrinsics/gerror.c \
Index: libgfortran/Makefile.in
===================================================================
--- libgfortran/Makefile.in	(revision 147057)
+++ libgfortran/Makefile.in	(working copy)
@@ -421,7 +421,8 @@
 	intrinsics/cshift0.c intrinsics/ctime.c \
 	intrinsics/date_and_time.c intrinsics/dtime.c intrinsics/env.c \
 	intrinsics/eoshift0.c intrinsics/eoshift2.c \
-	intrinsics/erfc_scaled.c intrinsics/etime.c intrinsics/exit.c \
+	intrinsics/erfc_scaled.c intrinsics/etime.c \
+	intrinsics/execute_command_line.c intrinsics/exit.c \
 	intrinsics/fnum.c intrinsics/gerror.c intrinsics/getcwd.c \
 	intrinsics/getlog.c intrinsics/getXid.c intrinsics/hostnm.c \
 	intrinsics/ierrno.c intrinsics/ishftc.c \
@@ -713,16 +714,17 @@
 am__objects_36 = associated.lo abort.lo access.lo args.lo \
 	c99_functions.lo chdir.lo chmod.lo clock.lo cpu_time.lo \
 	cshift0.lo ctime.lo date_and_time.lo dtime.lo env.lo \
-	eoshift0.lo eoshift2.lo erfc_scaled.lo etime.lo exit.lo \
-	fnum.lo gerror.lo getcwd.lo getlog.lo getXid.lo hostnm.lo \
-	ierrno.lo ishftc.lo iso_c_generated_procs.lo iso_c_binding.lo \
-	kill.lo link.lo malloc.lo mvbits.lo move_alloc.lo \
-	pack_generic.lo perror.lo selected_char_kind.lo signal.lo \
-	size.lo sleep.lo spread_generic.lo string_intrinsics.lo \
-	system.lo rand.lo random.lo rename.lo reshape_generic.lo \
-	reshape_packed.lo selected_int_kind.lo selected_real_kind.lo \
-	stat.lo symlnk.lo system_clock.lo time.lo transpose_generic.lo \
-	umask.lo unlink.lo unpack_generic.lo in_pack_generic.lo \
+	eoshift0.lo eoshift2.lo erfc_scaled.lo etime.lo \
+	execute_command_line.lo exit.lo fnum.lo gerror.lo getcwd.lo \
+	getlog.lo getXid.lo hostnm.lo ierrno.lo ishftc.lo \
+	iso_c_generated_procs.lo iso_c_binding.lo kill.lo link.lo \
+	malloc.lo mvbits.lo move_alloc.lo pack_generic.lo perror.lo \
+	selected_char_kind.lo signal.lo size.lo sleep.lo \
+	spread_generic.lo string_intrinsics.lo system.lo rand.lo \
+	random.lo rename.lo reshape_generic.lo reshape_packed.lo \
+	selected_int_kind.lo selected_real_kind.lo stat.lo symlnk.lo \
+	system_clock.lo time.lo transpose_generic.lo umask.lo \
+	unlink.lo unpack_generic.lo in_pack_generic.lo \
 	in_unpack_generic.lo
 am__objects_37 =
 am__objects_38 = _abs_c4.lo _abs_c8.lo _abs_c10.lo _abs_c16.lo \
@@ -1004,6 +1006,7 @@
 intrinsics/eoshift2.c \
 intrinsics/erfc_scaled.c \
 intrinsics/etime.c \
+intrinsics/execute_command_line.c \
 intrinsics/exit.c \
 intrinsics/fnum.c \
 intrinsics/gerror.c \
@@ -1850,6 +1853,7 @@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/erfc_scaled.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/error.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/etime.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/execute_command_line.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/exit.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/exponent_r10.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/exponent_r16.Plo@am__quote@
@@ -5420,6 +5424,13 @@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(LIBTOOL) --tag=CC --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o etime.lo `test -f 'intrinsics/etime.c' || echo '$(srcdir)/'`intrinsics/etime.c
 
+execute_command_line.lo: intrinsics/execute_command_line.c
+@am__fastdepCC_TRUE@	if $(LIBTOOL) --tag=CC --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT execute_command_line.lo -MD -MP -MF "$(DEPDIR)/execute_command_line.Tpo" -c -o execute_command_line.lo `test -f 'intrinsics/execute_command_line.c' || echo '$(srcdir)/'`intrinsics/execute_command_line.c; \
+@am__fastdepCC_TRUE@	then mv -f "$(DEPDIR)/execute_command_line.Tpo" "$(DEPDIR)/execute_command_line.Plo"; else rm -f "$(DEPDIR)/execute_command_line.Tpo"; exit 1; fi
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='intrinsics/execute_command_line.c' object='execute_command_line.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(LIBTOOL) --tag=CC --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o execute_command_line.lo `test -f 'intrinsics/execute_command_line.c' || echo '$(srcdir)/'`intrinsics/execute_command_line.c
+
 exit.lo: intrinsics/exit.c
 @am__fastdepCC_TRUE@	if $(LIBTOOL) --tag=CC --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT exit.lo -MD -MP -MF "$(DEPDIR)/exit.Tpo" -c -o exit.lo `test -f 'intrinsics/exit.c' || echo '$(srcdir)/'`intrinsics/exit.c; \
 @am__fastdepCC_TRUE@	then mv -f "$(DEPDIR)/exit.Tpo" "$(DEPDIR)/exit.Plo"; else rm -f "$(DEPDIR)/exit.Tpo"; exit 1; fi
