gcc/toplev.{c,h} + PR fortran/{40569,40568} compiler_options() + fixes

gcc/
2010-09-28  Tobias Burnus  <burnus@net-b.de>

        PR fortran/40569
        PR fortran/40568
	* toplev.h (save_decoded_options, save_decoded_options_count):
	New global variables.
	* toplev.c (save_decoded_options, save_decoded_options_count):
	export variables.

gcc/fortran/
2010-09-28  Tobias Burnus  <burnus@net-b.de>

        PR fortran/40569
        PR fortran/40568
	* intrinsic.c (add_functions): Make compiler_version and
	compiler_options CLASS_INQUIRY.
	* gfortran.h (gfc_get_option_string): New prototype.
	* intrinsic.texi (COMPILER_VERSION, COMPILER_OPTIONS):
	Add documentation.
	(C_SIZEOF): Mark as inquiry function of ISO_C_BINDING.
	(ISO_FORTRAN_ENV): Refer to COMPILER_VERSION and COMPILER_OPTIONS.
	(ISO_C_BINDING): Refer to C_SIZEOF.
	* options.c (gfc_get_option_string): New function.
	* simplify.c (gfc_simplify_compiler_options): Use it.
	(gfc_simplify_compiler_version): Include compiler name.

Index: gcc/toplev.c
===================================================================
--- gcc/toplev.c	(revision 164676)
+++ gcc/toplev.c	(working copy)
@@ -127,8 +127,8 @@  static bool no_backend;
 #define MAX_LINE 75
 
 /* Decoded options, and number of such options.  */
-static struct cl_decoded_option *save_decoded_options;
-static unsigned int save_decoded_options_count;
+struct cl_decoded_option *save_decoded_options;
+unsigned int save_decoded_options_count;
 
 /* Name of top-level original source file (what was input to cpp).
    This comes from the #-command at the beginning of the actual input.
Index: gcc/toplev.h
===================================================================
--- gcc/toplev.h	(revision 164676)
+++ gcc/toplev.h	(working copy)
@@ -29,6 +29,11 @@  along with GCC; see the file COPYING3.
 #define skip_leading_substring(whole,  part) \
    (strncmp (whole, part, strlen (part)) ? NULL : whole + strlen (part))
 
+/* Decoded options, and number of such options.  */
+extern struct cl_decoded_option *save_decoded_options;
+extern unsigned int save_decoded_options_count;
+
+
 extern int toplev_main (int, char **);
 extern void strip_off_ending (char *, int);
 extern void rest_of_decl_compilation (tree, int, int);
Index: gcc/fortran/intrinsic.c
===================================================================
--- gcc/fortran/intrinsic.c	(revision 164676)
+++ gcc/fortran/intrinsic.c	(working copy)
@@ -2644,12 +2644,12 @@  add_functions (void)
   make_from_module();
 
   /* COMPILER_OPTIONS and COMPILER_VERSION are part of ISO_FORTRAN_ENV.  */  
-  add_sym_0 ("compiler_options", GFC_ISYM_COMPILER_OPTIONS, CLASS_IMPURE,
+  add_sym_0 ("compiler_options", GFC_ISYM_COMPILER_OPTIONS, CLASS_INQUIRY,
 	     ACTUAL_NO, BT_CHARACTER, 1, GFC_STD_F2008,
 	     NULL, gfc_simplify_compiler_options, NULL);
   make_from_module();
 
-  add_sym_0 ("compiler_version", GFC_ISYM_COMPILER_VERSION, CLASS_IMPURE,
+  add_sym_0 ("compiler_version", GFC_ISYM_COMPILER_VERSION, CLASS_INQUIRY,
 	     ACTUAL_NO, BT_CHARACTER, 1, GFC_STD_F2008,
 	     NULL, gfc_simplify_compiler_version, NULL);
   make_from_module();
Index: gcc/fortran/gfortran.h
===================================================================
--- gcc/fortran/gfortran.h	(revision 164676)
+++ gcc/fortran/gfortran.h	(working copy)
@@ -2403,6 +2403,7 @@  void gfc_init_options (unsigned int,
 bool gfc_handle_option (size_t, const char *, int, int,
 			const struct cl_option_handlers *);
 bool gfc_post_options (const char **);
+char *gfc_get_option_string (void);
 
 /* f95-lang.c */
 void gfc_maybe_initialize_eh (void);
Index: gcc/fortran/intrinsic.texi
===================================================================
--- gcc/fortran/intrinsic.texi	(revision 164676)
+++ gcc/fortran/intrinsic.texi	(working copy)
@@ -86,6 +86,8 @@  Some basic guidelines for editing this d
 * @code{CMPLX}:         CMPLX,     Complex conversion function
 * @code{COMMAND_ARGUMENT_COUNT}: COMMAND_ARGUMENT_COUNT, Get number of command line arguments
 * @code{COMPLEX}:       COMPLEX,   Complex conversion function
+* @code{COMPILER_VERSION}: COMPILER_VERSION, Compiler version string
+* @code{COMPILER_OPTIONS}: COMPILER_OPTIONS, Options passed to the compiler
 * @code{CONJG}:         CONJG,     Complex conjugate function
 * @code{COS}:           COS,       Cosine function
 * @code{COSH}:          COSH,      Hyperbolic cosine function
@@ -2363,7 +2365,7 @@  expression @code{X} occupies.
 Fortran 2008
 
 @item @emph{Class}:
-Intrinsic function
+Inquiry function of the module @code{ISO_C_BINDING}
 
 @item @emph{Syntax}:
 @code{N = C_SIZEOF(X)}
@@ -2375,7 +2377,7 @@  Intrinsic function
 
 @item @emph{Return value}:
 The return value is of type integer and of the system-dependent kind
-@var{C_SIZE_T} (from the @var{ISO_C_BINDING} module). Its value is the
+@code{C_SIZE_T} (from the @code{ISO_C_BINDING} module). Its value is the
 number of bytes occupied by the argument.  If the argument has the
 @code{POINTER} attribute, the number of bytes of the storage area pointed
 to is returned.  If the argument is of a derived type with @code{POINTER}
@@ -2719,6 +2721,92 @@  end program test_command_argument_count
 
 
 
+@node COMPILER_OPTIONS
+@section @code{COMPILER_OPTIONS} --- Options passed to the compiler
+@fnindex COMPILER_OPTIONS
+@cindex flags inquiry function
+@cindex options inquiry function
+@cindex compiler flags inquiry function
+
+@table @asis
+@item @emph{Description}:
+@code{COMPILER_OPTIONS()} returns a string with the options used for
+compiling.
+
+@item @emph{Standard}:
+Fortran 2008
+
+@item @emph{Class}:
+Inquiry function of the module @code{ISO_FORTRAN_ENV}
+
+@item @emph{Syntax}:
+@code{STR = COMPILER_OPTIONS()}
+
+@item @emph{Arguments}:
+None.
+
+@item @emph{Return value}:
+The return value is a default-kind string with system-dependent length.
+It contains the compiler flags used to compile the file, which called
+the @code{COMPILER_OPTIONS} intrinsic.
+
+@item @emph{Example}:
+@smallexample
+   use iso_fortran_env
+   print '(4a)', 'This file was compiled by ', &
+                 compiler_version(), ' using the the options ', &
+                 compiler_options()
+   end
+@end smallexample
+
+@item @emph{See also}:
+@ref{COMPILER_VERSION}, @ref{ISO_FORTRAN_ENV}
+@end table
+
+
+
+@node COMPILER_VERSION
+@section @code{COMPILER_VERSION} --- Compiler version string
+@fnindex COMPILER_VERSION
+@cindex compiler, name and version
+@cindex version of the compiler
+
+@table @asis
+@item @emph{Description}:
+@code{COMPILER_VERSION()} returns a string with the name and the
+version of the compiler.
+
+@item @emph{Standard}:
+Fortran 2008
+
+@item @emph{Class}:
+Inquiry function of the module @code{ISO_FORTRAN_ENV}
+
+@item @emph{Syntax}:
+@code{STR = COMPILER_VERSION()}
+
+@item @emph{Arguments}:
+None.
+
+@item @emph{Return value}:
+The return value is a default-kind string with system-dependent length.
+It contains the name of the compiler and its version number.
+
+@item @emph{Example}:
+@smallexample
+   use iso_fortran_env
+   print '(4a)', 'This file was compiled by ', &
+                 compiler_version(), ' using the the options ', &
+                 compiler_options()
+   end
+@end smallexample
+
+@item @emph{See also}:
+@ref{COMPILER_OPTIONS}, @ref{ISO_FORTRAN_ENV}
+@end table
+
+
+
 @node COMPLEX
 @section @code{COMPLEX} --- Complex conversion function
 @fnindex COMPLEX
@@ -12685,6 +12773,9 @@  Scalar default-integer constant used as
 denote that the lock variable is unlocked. (Fortran 2008 or later.)
 @end table
 
+The module also provides the following intrinsic procedures:
+@ref{COMPILER_OPTIONS} and @ref{COMPILER_VERSION}.
+
 
 
 @node ISO_C_BINDING
@@ -12704,6 +12795,7 @@  manual.
 @item @code{C_F_PROCPOINTER}
 @item @code{C_FUNLOC}
 @item @code{C_LOC}
+@item @code{C_SIZEOF}
 @end table
 @c TODO: Vertical spacing between C_FUNLOC and C_LOC wrong in PDF,
 @c don't really know why.
Index: gcc/fortran/options.c
===================================================================
--- gcc/fortran/options.c	(revision 164676)
+++ gcc/fortran/options.c	(working copy)
@@ -27,6 +27,7 @@  along with GCC; see the file COPYING3.
 #include "flags.h"
 #include "intl.h"
 #include "opts.h"
+#include "toplev.h"  /* For save_decoded_options.  */
 #include "options.h"
 #include "params.h"
 #include "tree-inline.h"
@@ -966,3 +967,75 @@  gfc_handle_option (size_t scode, const c
 
   return result;
 }
+
+
+char *
+gfc_get_option_string (void)
+{
+  unsigned j;
+  size_t len, pos;
+  char *result;
+
+  /* Determine required string length.  */
+
+  len = 0;
+  for (j = 1; j < save_decoded_options_count; j++)
+    {
+      switch (save_decoded_options[j].opt_index)
+        {
+        case OPT_o:
+        case OPT_d:
+        case OPT_dumpbase:
+        case OPT_dumpdir:
+        case OPT_auxbase:
+        case OPT_quiet:
+        case OPT_version:
+        case OPT_fintrinsic_modules_path:
+          /* Ignore these.  */
+          continue;
+        }
+
+      /* Ignore file names. */
+      if (save_decoded_options[j].orig_option_with_args_text[0] == '-')
+	len += 1 + strlen (save_decoded_options[j].orig_option_with_args_text);
+    }
+
+  result = (char *) gfc_getmem (len);
+
+  pos = 0; 
+  for (j = 1; j < save_decoded_options_count; j++)
+    {
+      switch (save_decoded_options[j].opt_index)
+        {
+        case OPT_o:
+        case OPT_d:
+        case OPT_dumpbase:
+        case OPT_dumpdir:
+        case OPT_auxbase:
+        case OPT_quiet:
+        case OPT_version:
+        case OPT_fintrinsic_modules_path:
+          /* Ignore these.  */
+	  continue;
+
+        case OPT_cpp_:
+	  /* Use "-cpp" rather than "-cpp=<temporary file>".  */
+	  len = 4;
+	  break;
+
+        default:
+	  /* Ignore file names. */
+	  if (save_decoded_options[j].orig_option_with_args_text[0] != '-')
+	    continue;
+
+	  len = strlen (save_decoded_options[j].orig_option_with_args_text);
+        }
+
+      memcpy (&result[pos], save_decoded_options[j].orig_option_with_args_text, len);
+      pos += len;
+      result[pos++] = ' ';
+    }
+
+  result[--pos] = '\0';
+  return result;
+}
Index: gcc/fortran/simplify.c
===================================================================
--- gcc/fortran/simplify.c	(revision 164676)
+++ gcc/fortran/simplify.c	(working copy)
@@ -6739,16 +6739,26 @@  gfc_convert_char_constant (gfc_expr *e,
 gfc_expr *
 gfc_simplify_compiler_options (void)
 {
-  /* FIXME: PR40569 - return the proper compiler arguments.  */
-  return gfc_get_character_expr (gfc_default_character_kind,
-                                &gfc_current_locus, "", 0);
+  char *str;
+  gfc_expr *result;
+
+  str = gfc_get_option_string ();
+  result = gfc_get_character_expr (gfc_default_character_kind,
+				   &gfc_current_locus, str, strlen (str));
+  gfc_free (str);
+  return result;
 }
 
 
 gfc_expr *
 gfc_simplify_compiler_version (void)
 {
+  char *buffer;
+  size_t len;
+
+  len = strlen ("GCC version ") + strlen (version_string) + 1;
+  buffer = (char*) alloca (len);
+  snprintf (buffer, len, "GCC version %s", version_string);
   return gfc_get_character_expr (gfc_default_character_kind,
-                                &gfc_current_locus, version_string,
-                                strlen (version_string));
+                                &gfc_current_locus, buffer, len);
 }