re PR libfortran/20006 ($ format extension doesn't work)

	PR libfortran/20006
	* gfortran.h: Add is_main_program member to symbol_attribute.
	* trans-decl: Add a gfor_fndecl_set_std tree.
	(gfc_build_builtin_function_decls): Create it.
	(gfc_generate_function_code): Add this call at the beginning of
	the main program.
	* trans.c (gfc_generate_code): Move main_program and attr.
	* trans.h: Add declaration for gfor_fndecl_set_std.

	* Makefile.am: Add file runtime/compile_options.c.
	* Makefile.in: Regenerate.
	* libgfortran.h: Create structure compile_options_t. Define the
	compile_options variable and GFC_STD_ macros.
	* runtime/compile_options.c: New file.
	* runtime/error.c (notify_std): New function.
	* runtime/main.c (init): Call init_compile_options during
	initialization.
	* io/format.c: Use the new notify_std function for the $
	descriptor extension.

	* gfortran.dg/runtime_warning_1.f90: New test.

Co-Authored-By: Steven Bosscher <stevenb@suse.de>

From-SVN: r102990

8 files changed, 138 insertions, 3 deletions

diff --git a/libgfortran/ChangeLog b/libgfortran/ChangeLog
index f64b01d..bbf3355 100644
--- a/libgfortran/ChangeLog
+++ b/libgfortran/ChangeLog
@@ -1,3 +1,18 @@
+2005-09-11  Francois-Xavier Coudert  <coudert@clipper.ens.fr>
+	    Steven Bosscher  <stevenb@suse.de>
+
+	PR libfortran/20006
+	* Makefile.am: Add file runtime/compile_options.c.
+	* Makefile.in: Regenerate.
+	* libgfortran.h: Create structure compile_options_t. Define the
+	compile_options variable and GFC_STD_ macros.
+	* runtime/compile_options.c: New file.
+	* runtime/error.c (notify_std): New function.
+	* runtime/main.c (init): Call init_compile_options during
+	initialization.
+	* io/format.c: Use the new notify_std function for the $
+	descriptor extension.
+
 2005-08-09  Francois-Xavier Coudert  <coudert@clipper.ens.fr>
 	* Makefile.am: Add file intrinsics/tty.c to Makefile process.
 	* Makefile.in: Regenerate.
diff --git a/libgfortran/Makefile.am b/libgfortran/Makefile.am
index d5e21c6..4f12f8f 100644
--- a/libgfortran/Makefile.am
+++ b/libgfortran/Makefile.am
@@ -94,6 +94,7 @@ runtime/in_unpack_generic.c \
 runtime/normalize.c
 
 gfor_src= \
+runtime/compile_options.c \
 runtime/environ.c \
 runtime/error.c \
 runtime/main.c \
diff --git a/libgfortran/Makefile.in b/libgfortran/Makefile.in
index f69e3b4..ee68562 100644
--- a/libgfortran/Makefile.in
+++ b/libgfortran/Makefile.in
@@ -67,8 +67,8 @@ am__strip_dir = `echo $$p | sed -e 's|^.*/||'`;
 am__installdirs = "$(DESTDIR)$(toolexeclibdir)"
 toolexeclibLTLIBRARIES_INSTALL = $(INSTALL)
 LTLIBRARIES = $(toolexeclib_LTLIBRARIES)
-am__objects_1 = environ.lo error.lo main.lo memory.lo pause.lo stop.lo \
-	string.lo select.lo
+am__objects_1 = compile_options.lo environ.lo error.lo main.lo \
+	memory.lo pause.lo stop.lo string.lo select.lo
 am__objects_2 = all_l4.lo all_l8.lo
 am__objects_3 = any_l4.lo any_l8.lo
 am__objects_4 = count_4_l4.lo count_8_l4.lo count_4_l8.lo \
@@ -388,6 +388,7 @@ runtime/in_unpack_generic.c \
 runtime/normalize.c
 
 gfor_src = \
+runtime/compile_options.c \
 runtime/environ.c \
 runtime/error.c \
 runtime/main.c \
@@ -831,6 +832,9 @@ f2c_specifics.lo: intrinsics/f2c_specifics.F90
 .c.lo:
 	$(LTCOMPILE) -c -o $@ $<
 
+compile_options.lo: runtime/compile_options.c
+	$(LIBTOOL) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o compile_options.lo `test -f 'runtime/compile_options.c' || echo '$(srcdir)/'`runtime/compile_options.c
+
 environ.lo: runtime/environ.c
 	$(LIBTOOL) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o environ.lo `test -f 'runtime/environ.c' || echo '$(srcdir)/'`runtime/environ.c
 
diff --git a/libgfortran/io/format.c b/libgfortran/io/format.c
index 229a937..e075eee 100644
--- a/libgfortran/io/format.c
+++ b/libgfortran/io/format.c
@@ -580,6 +580,7 @@ parse_format_list (void)
     case FMT_DOLLAR:
       get_fnode (&head, &tail, FMT_DOLLAR);
       tail->repeat = 1;
+      notify_std (GFC_STD_GNU, "Extension: $ descriptor");
       goto between_desc;
 
     case FMT_T:
diff --git a/libgfortran/libgfortran.h b/libgfortran/libgfortran.h
index 6db6ef9..de17c2f 100644
--- a/libgfortran/libgfortran.h
+++ b/libgfortran/libgfortran.h
@@ -295,11 +295,25 @@ typedef struct
 }
 options_t;
 
-
 extern options_t options;
 internal_proto(options);
 
 
+/* Compile-time options that will influence the library.  */
+
+typedef struct
+{
+  int warn_std;
+  int allow_std;
+}
+compile_options_t;
+
+extern compile_options_t compile_options;
+internal_proto(compile_options);
+
+
+
+
 /* Structure for statement options.  */
 
 typedef struct
@@ -334,6 +348,18 @@ typedef enum
 error_codes;
 
 
+/* Flags to specify which standard/extension contains a feature.
+   Keep them in sync with their counterparts in gcc/fortran/gfortran.h.  */
+#define GFC_STD_LEGACY          (1<<6) /* Backward compatibility.  */
+#define GFC_STD_GNU             (1<<5)    /* GNU Fortran extension.  */
+#define GFC_STD_F2003           (1<<4)    /* New in F2003.  */
+/* Note that no features were obsoleted nor deleted in F2003.  */
+#define GFC_STD_F95             (1<<3)    /* New in F95.  */
+#define GFC_STD_F95_DEL         (1<<2)    /* Deleted in F95.  */
+#define GFC_STD_F95_OBS         (1<<1)    /* Obsoleted in F95.  */
+#define GFC_STD_F77             (1<<0)    /* Up to and including F77.  */
+
+
 /* The filename and line number don't go inside the globals structure.
    They are set by the rest of the program and must be linked to.  */
 
diff --git a/libgfortran/runtime/compile_options.c b/libgfortran/runtime/compile_options.c
new file mode 100644
index 0000000..5b12419
--- /dev/null
+++ b/libgfortran/runtime/compile_options.c
@@ -0,0 +1,61 @@
+/* Handling of compile-time options that influence the library.
+   Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is part of the GNU Fortran 95 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 2, or (at your option)
+any later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+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.
+
+You should have received a copy of the GNU General Public License
+along with libgfortran; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "config.h"
+
+#include "libgfortran.h"
+
+
+/* Useful compile-time options will be stored in here.  */
+compile_options_t compile_options;
+
+
+/* Prototypes */
+extern void set_std (GFC_INTEGER_4, GFC_INTEGER_4);
+export_proto(set_std);
+
+
+void
+set_std (GFC_INTEGER_4 warn_std, GFC_INTEGER_4 allow_std)
+{
+  compile_options.warn_std = warn_std;
+  compile_options.allow_std = allow_std;
+}
+
+
+/* Default values for the compile-time options.  Keep in sync with
+   gcc/fortran/options.c (gfc_init_options).  */
+void
+init_compile_options (void)
+{
+  compile_options.warn_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
+    | GFC_STD_F2003 | GFC_STD_LEGACY;
+  compile_options.allow_std = GFC_STD_F95_OBS | GFC_STD_F95_DEL
+    | GFC_STD_F2003 | GFC_STD_F95 | GFC_STD_F77 | GFC_STD_GNU | GFC_STD_LEGACY;
+}
diff --git a/libgfortran/runtime/error.c b/libgfortran/runtime/error.c
index ff91b96..b2f29ac 100644
--- a/libgfortran/runtime/error.c
+++ b/libgfortran/runtime/error.c
@@ -489,3 +489,29 @@ generate_error (int family, const char *message)
 
   runtime_error (message);
 }
+
+
+
+/* Possibly issue a warning/error about use of a nonstandard (or deleted)
+   feature.  An error/warning will be issued if the currently selected
+   standard does not contain the requested bits.  */
+
+try
+notify_std (int std, const char * message)
+{
+  int warning;
+
+  warning = compile_options.warn_std & std;
+  if ((compile_options.allow_std & std) != 0 && !warning)
+    return SUCCESS;
+
+  show_locus ();
+  if (!warning)
+    {
+      st_printf ("Fortran runtime error: %s\n", message);
+      sys_exit (2);
+    }
+  else
+    st_printf ("Fortran runtime warning: %s\n", message);
+  return FAILURE;
+}
diff --git a/libgfortran/runtime/main.c b/libgfortran/runtime/main.c
index d2cedf7..6801aad 100644
--- a/libgfortran/runtime/main.c
+++ b/libgfortran/runtime/main.c
@@ -96,6 +96,7 @@ init (void)
   init_variables ();
 
   init_units ();
+  init_compile_options ();
 
 #ifdef DEBUG
   /* Check for special command lines.  */