Output yylloc macro defn in glr.c even if locations are not being generated.

[bison.git] / src / files.c

diff --git a/src/files.c b/src/files.c
index 7e29c4c60fa8d1eafde88f1877c9e2de6ee0a6d6..32a3e729c931dfc0029941b1677bbb7962233397 100644 (file)
--- a/src/files.c
+++ b/src/files.c
@@ -1,5 +1,7 @@
-/* Open and close files for bison,
-   Copyright 1984, 1986, 1989, 1992, 2000, 2001 Free Software Foundation, Inc.
+/* Open and close files for Bison.
+
+   Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004
+   Free Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -20,104 +22,69 @@
 
 
 #include "system.h"
 
 
 #include "system.h"

-#include "getargs.h"
+
+#include <error.h>
+#include <get-errno.h>
+#include <quote.h>
+#include <xstrndup.h>
+
+#include "complain.h"

 #include "files.h"
 #include "files.h"

+#include "getargs.h"

 #include "gram.h"
 #include "gram.h"

-#include "complain.h"
+
+/* From basename.c.  Almost a lie, as it returns a char *. */
+const char *base_name (char const *name);

 
 FILE *finput = NULL;
 
 
 FILE *finput = NULL;
 

-struct obstack action_obstack;
-struct obstack attrs_obstack;
-struct obstack table_obstack;
-struct obstack defines_obstack;
-struct obstack guard_obstack;
-struct obstack output_obstack;
+struct obstack pre_prologue_obstack;
+struct obstack post_prologue_obstack;
+
+/* Initializing some values below (such SPEC_NAME_PREFIX to `yy') is
+   tempting, but don't do that: for the time being our handling of the
+   %directive vs --option leaves precedence to the options by deciding
+   that if a %directive sets a variable which is really set (i.e., not
+   NULL), then the %directive is ignored.  As a result, %name-prefix,
+   for instance, will not be honored.  */

 
 char *spec_outfile = NULL;     /* for -o. */
 char *spec_file_prefix = NULL; /* for -b. */
 
 char *spec_outfile = NULL;     /* for -o. */
 char *spec_file_prefix = NULL; /* for -b. */

-char *spec_name_prefix = NULL; /* for -p. */
+const char *spec_name_prefix = NULL;   /* for -p. */

 char *spec_verbose_file = NULL;   /* for --verbose. */
 char *spec_graph_file = NULL;   /* for -g. */
 char *spec_defines_file = NULL; /* for --defines. */
 char *spec_verbose_file = NULL;   /* for --verbose. */
 char *spec_graph_file = NULL;   /* for -g. */
 char *spec_defines_file = NULL; /* for --defines. */

+char *parser_file_name = NULL;
+
+uniqstr grammar_file = NULL;
+uniqstr current_file = NULL;

 
 

-char *infile = NULL;
-char *attrsfile = NULL;
+static char *full_base_name = NULL;

 
 

-static char *base_name = NULL;
-static char *short_base_name = NULL;
+/* Prefix used to generate output file names.  */
+char *short_base_name = NULL;

 
 /* C source file extension (the parser source).  */
 const char *src_extension = NULL;
 /* Header file extension (if option ``-d'' is specified).  */
 const char *header_extension = NULL;
 \f
 
 /* C source file extension (the parser source).  */
 const char *src_extension = NULL;
 /* Header file extension (if option ``-d'' is specified).  */
 const char *header_extension = NULL;
 \f

-
-/*--------------------------.
-| Is SUFFIX ending STRING?  |
-`--------------------------*/
-
-static int
-strsuffix (const char *string, const char *suffix)
-{
-  size_t string_len = strlen (string);
-  size_t suffix_len = strlen (suffix);
-  if (suffix_len <= string_len)
-    return !strcmp (string + string_len - suffix_len, suffix);
-  else
-    return 0;
-}
-
-

 /*-----------------------------------------------------------------.
 | Return a newly allocated string composed of the concatenation of |
 /*-----------------------------------------------------------------.
 | Return a newly allocated string composed of the concatenation of |

-| STRING1, and STRING2.                                            |
+| STR1, and STR2.                                                  |

 `-----------------------------------------------------------------*/
 
 static char *
 `-----------------------------------------------------------------*/
 
 static char *

-stringappend (const char *string1, const char *string2)
+concat2 (char const *str1, char const *str2)

 {
 {

-  size_t len = strlen (string1) + strlen (string2);
-  char *res = XMALLOC (char, len + 1);
+  size_t len = strlen (str1) + strlen (str2);
+  char *res = xmalloc (len + 1);

   char *cp;
   char *cp;

-  cp = stpcpy (res, string1);
-  cp = stpcpy (cp, string2);
+  cp = stpcpy (res, str1);
+  cp = stpcpy (cp, str2);

   return res;
 }
 
   return res;
 }
 

-
-/*---------------------------------------------------------------.
-|  Computes the macro name used to avoid double inclusion in the |
-|  header of the parser and store it in header_macro_name.       |
-`---------------------------------------------------------------*/
-
-static char *
-compute_header_macro (void)
-{
-  char *macro_name, *cp;
-
-  if (spec_defines_file)
-    macro_name = xstrdup (spec_defines_file);
-  else
-    {
-      macro_name = XMALLOC (char,
-                           strlen (base_name) +
-                           strlen (header_extension) + 1);
-
-      stpcpy (macro_name, base_name);
-      strcat (macro_name, header_extension);
-    }
-
-  for (cp = macro_name; *cp; ++cp)
-    if (islower (*cp))
-      *cp = toupper (*cp);
-    else if (!isalnum (*cp))
-      *cp = '_';
-
-  return macro_name;
-}
-
-

 /*-----------------------------------------------------------------.
 | Try to open file NAME with mode MODE, and print an error message |
 | if fails.                                                        |
 /*-----------------------------------------------------------------.
 | Try to open file NAME with mode MODE, and print an error message |
 | if fails.                                                        |


@@ -130,7 +97,7 @@ xfopen (const char *name, const char *mode)
 
   ptr = fopen (name, mode);
   if (!ptr)
 
   ptr = fopen (name, mode);
   if (!ptr)

-    error (2, errno, _("cannot open file `%s'"), name);
+    error (EXIT_FAILURE, get_errno (), _("cannot open file `%s'"), name);

 
   return ptr;
 }
 
   return ptr;
 }


@@ -139,120 +106,31 @@ xfopen (const char *name, const char *mode)
 | Try to close file PTR, and print an error message if fails.  |
 `-------------------------------------------------------------*/
 
 | Try to close file PTR, and print an error message if fails.  |
 `-------------------------------------------------------------*/
 

-int
+void

 xfclose (FILE *ptr)
 {
 xfclose (FILE *ptr)
 {

-  int result;
-

   if (ptr == NULL)
   if (ptr == NULL)

-    return 0;
-
-  result = fclose (ptr);
-  if (result == EOF)
-    error (2, errno, _("cannot close file"));
-
-  return result;
-}
+    return;

 
 

-/*--------------------------------------------------.
-| Save the content of the obstack OBS in FILENAME.  |
-`--------------------------------------------------*/
+  if (ferror (ptr))
+    error (EXIT_FAILURE, 0, _("I/O error"));

 
 

-static void
-obstack_save (struct obstack *obs, const char *filename)
-{
-  FILE *out = xfopen (filename, "w");
-  size_t size = obstack_object_size (obs);
-  fwrite (obstack_finish (obs), 1, size, out);
-  xfclose (out);
+  if (fclose (ptr) != 0)
+    error (EXIT_FAILURE, get_errno (), _("cannot close file"));

 }
 }

+\f

 
 /*---------------------------------------------------------------------.
 
 /*---------------------------------------------------------------------.

-| Output double inclusion protection macros and saves defines_obstack  |
+| Compute FULL_BASE_NAME, SHORT_BASE_NAME and output files extensions. |

 `---------------------------------------------------------------------*/
 
 `---------------------------------------------------------------------*/
 

-static void
-defines_obstack_save (const char *filename)
-{
-  FILE *out = xfopen (filename, "w");
-  size_t size = obstack_object_size (&defines_obstack);
-  char *macro_name = compute_header_macro ();
-
-  fprintf (out, "#ifndef %s\n", macro_name);
-  fprintf (out, "# define %s\n\n", macro_name);
-  fwrite (obstack_finish (&defines_obstack), 1, size, out);
-  fprintf (out, "\n#endif /* not %s */\n", macro_name);
-
-  free (macro_name);
-  xfclose (out);
-}
-
-/*------------------------------------------------------------------.
-| Return the path to the skeleton which locaction might be given in |
-| ENVVAR, otherwise return SKELETON_NAME.                           |
-`------------------------------------------------------------------*/
-
-const char *
-skeleton_find (const char *envvar, const char *skeleton_name)
-{
-  const char *res = getenv (envvar);
-
-#if defined (MSDOS) || defined (_WIN32)
-  if (!res)
-    {
-      /* Skeleton file name without path */
-      const char *skel_name = strrchr(skeleton_name, '/');
-      if (!skel_name)
-        skel_name = strrchr(skeleton_name, '\\');
-      if (!skel_name)
-        skel_name = skeleton_name;
-      else
-        ++skel_name;
-
-      /* File doesn't exist in current directory; try in INIT directory.  */
-      const char *cp = getenv ("INIT");
-      if (cp)
-       {
-         res = XMALLOC (char, strlen (cp) + strlen (skel_name) + 2);
-         sprintf (res, "%s%c%s", cp, '\\', skel_name);
-       }
-      else if (access (skel_name, 4) == 0) /* Look in current dir. */
-        res = skel_name;
-      else
-       {
-         /* Look in program locations dir. */
-         extern char *program_name;
-         cp = strrchr(program_name, '\\');
-         if (!cp)
-           return skeleton_name;
-         else
-           ++cp;
-         res = XMALLOC (char, cp - program_name + strlen (skel_name) + 1);
-         strncpy (res, program_name, cp - program_name);
-         strcpy (res + (cp - program_name), skel_name);
-       }
-    }
-#endif /* defined (MSDOS) || defined (_WIN32) */
-  if (!res)
-    res = skeleton_name;
-
-  return res;
-}
-\f
-
-/*----------------------------------------------------------------.
-| Compute BASE_NAME, SHORT_BASE_NAME and output files extensions. |
-`----------------------------------------------------------------*/
-

 /* Replace all characters FROM by TO in the string IN.
    and returns a new allocated string.  */
 static char *
 tr (const char *in, char from, char to)
 {
   char *temp;
 /* Replace all characters FROM by TO in the string IN.
    and returns a new allocated string.  */
 static char *
 tr (const char *in, char from, char to)
 {
   char *temp;

-  char *out;
-
-  out = XMALLOC (char, strlen (in) + 1);
+  char *out = xmalloc (strlen (in) + 1);

 
   for (temp = out; *in; in++, out++)
     if (*in == from)
 
   for (temp = out; *in; in++, out++)
     if (*in == from)


@@ -263,28 +141,7 @@ tr (const char *in, char from, char to)
   return (temp);
 }
 
   return (temp);
 }
 

-/* Gets the extension index in FILENAME. Returns 0 if fails to
-   find an extension.  */
-static int
-get_extension_index (const char *filename)
-{
-  int len;
-
-  len = strlen (filename);
-
-  if (filename[len-- - 1] == '.')
-    return (0);
-
-  while ((len > 0) && (filename[len - 1] != '.'))
-    if (filename[len - 1] == '/')
-      return (0);
-    else
-      len--;
-
-  return (len - 1);
-}
-
-/* Computes extensions from the grammar file extension. */
+/* Compute extensions from the grammar file extension.  */

 static void
 compute_exts_from_gf (const char *ext)
 {
 static void
 compute_exts_from_gf (const char *ext)
 {


@@ -294,7 +151,7 @@ compute_exts_from_gf (const char *ext)
   header_extension = tr (header_extension, 'Y', 'H');
 }
 
   header_extension = tr (header_extension, 'Y', 'H');
 }
 

-/* Computes extensions from the given c source file extension. */
+/* Compute extensions from the given c source file extension.  */

 static void
 compute_exts_from_src (const char *ext)
 {
 static void
 compute_exts_from_src (const char *ext)
 {


@@ -306,120 +163,143 @@ compute_exts_from_src (const char *ext)
   header_extension = tr (header_extension, 'C', 'H');
 }
 
   header_extension = tr (header_extension, 'C', 'H');
 }
 

+
+/* Decompose FILENAME in four parts: *BASE, *TAB, and *EXT, the fourth
+   part, (the directory) is ranging from FILENAME to the char before
+   *BASE, so we don't need an additional parameter.
+
+   *EXT points to the last period in the basename, or NULL if none.
+
+   If there is no *EXT, *TAB is NULL.  Otherwise, *TAB points to
+   `.tab' or `_tab' if present right before *EXT, or is NULL. *TAB
+   cannot be equal to *BASE.
+
+   None are allocated, they are simply pointers to parts of FILENAME.
+   Examples:
+
+   '/tmp/foo.tab.c' -> *BASE = 'foo.tab.c', *TAB = '.tab.c', *EXT =
+   '.c'
+
+   'foo.c' -> *BASE = 'foo.c', *TAB = NULL, *EXT = '.c'
+
+   'tab.c' -> *BASE = 'tab.c', *TAB = NULL, *EXT = '.c'
+
+   '.tab.c' -> *BASE = '.tab.c', *TAB = NULL, *EXT = '.c'
+
+   'foo.tab' -> *BASE = 'foo.tab', *TAB = NULL, *EXT = '.tab'
+
+   'foo_tab' -> *BASE = 'foo_tab', *TAB = NULL, *EXT = NULL
+
+   'foo' -> *BASE = 'foo', *TAB = NULL, *EXT = NULL.  */
+
+static void
+filename_split (const char *filename,
+               const char **base, const char **tab, const char **ext)
+{
+  *base = base_name (filename);
+
+  /* Look for the extension, i.e., look for the last dot. */
+  *ext = strrchr (*base, '.');
+  *tab = NULL;
+
+  /* If there is an extension, check if there is a `.tab' part right
+     before.  */
+  if (*ext)
+    {
+      size_t baselen = *ext - *base;
+      size_t dottablen = 4;
+      if (dottablen < baselen
+         && (strncmp (*ext - dottablen, ".tab", dottablen) == 0
+             || strncmp (*ext - dottablen, "_tab", dottablen) == 0))
+       *tab = *ext - dottablen;
+    }
+}
+
+

 /* FIXME: Should use xstrndup. */
 
 static void
 compute_base_names (void)
 {
 /* FIXME: Should use xstrndup. */
 
 static void
 compute_base_names (void)
 {

-  size_t base_length;
-  size_t short_base_length;
-  size_t ext_index;
+  const char *base, *tab, *ext;

 
   /* If --output=foo.c was specified (SPEC_OUTFILE == foo.c),
 
   /* If --output=foo.c was specified (SPEC_OUTFILE == foo.c),

-     BASE_NAME and SHORT_BASE_NAME are `foo'.
+     FULL_BASE_NAME and SHORT_BASE_NAME are `foo'.

 
 

-     If --output=foo.tab.c was specified, BASE_NAME is `foo.tab' and
-     SHORT_BASE_NAME is `foo'.
+     If --output=foo.tab.c was specified, FULL_BASE_NAME is `foo.tab'
+     and SHORT_BASE_NAME is `foo'.

 
      The precise -o name will be used for FTABLE.  For other output
      files, remove the ".c" or ".tab.c" suffix.  */
   if (spec_outfile)
     {
 
      The precise -o name will be used for FTABLE.  For other output
      files, remove the ".c" or ".tab.c" suffix.  */
   if (spec_outfile)
     {

-#ifdef MSDOS
-      strlwr (spec_outfile);
-#endif /* MSDOS */
-      /* BASE_LENGTH includes ".tab" but not ".c".  */
-      base_length = strlen (spec_outfile);
-
-      ext_index = get_extension_index (spec_outfile);
-      /* If the initial segment of extension contains 'c' or a 'C', I assume
-         that it is a C or C++ source file.  */
-      if (ext_index)
-       ext_index =
-         (strspn (spec_outfile + ext_index + 1, "cC")) ? ext_index : 0;
-      if (ext_index)
-       {
-         base_length -= strlen (spec_outfile + ext_index);
-         compute_exts_from_src (spec_outfile + ext_index);
-       }
+      filename_split (spec_outfile, &base, &tab, &ext);

 
 

-      base_name = strndup (spec_outfile, base_length);
-      /* SHORT_BASE_LENGTH includes neither ".tab" nor ".c".  */
-      short_base_length = base_length;
-      if (strsuffix (base_name, ".tab") || strsuffix (base_name, "_tab"))
-       short_base_length -= 4;
-      short_base_name = strndup (spec_outfile, short_base_length);
+      /* The full base name goes up the EXT, excluding it. */
+      full_base_name =
+       xstrndup (spec_outfile,
+                 (strlen (spec_outfile) - (ext ? strlen (ext) : 0)));

 
 

-      return;
+      /* The short base name goes up to TAB, excluding it.  */
+      short_base_name =
+       xstrndup (spec_outfile,
+                 (strlen (spec_outfile)
+                  - (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
+
+      if (ext)
+       compute_exts_from_src (ext);

     }
 
     }
 

-  /* If --file-prefix=foo was specified, BASE_NAME and SHORT_BASE_NAME
-     are `foo'.
+  /* If --file-prefix=foo was specified, FULL_BASE_NAME = `foo.tab'
+     and SHORT_BASE_NAME = `foo'.

 
      Construct names from it.  */
 
      Construct names from it.  */

-  if (spec_file_prefix)
+  else

     {
     {

-#ifdef MSDOS
-      strlwr (spec_file_prefix);
-#endif /* MSDOS */
-      short_base_name = xstrdup (spec_file_prefix);
-      base_name = XMALLOC (char,
-                          strlen (short_base_name) + strlen (EXT_TAB) + 1);
-      stpcpy (stpcpy (base_name, short_base_name), EXT_TAB);
-
-      /* Computes the extensions from the garmmar file name.  */
-      ext_index = get_extension_index (infile);
-      /* If the initial segment of extension contains a 'y' or a 'Y', I assume
-         that it is a yacc or bison grammar file.  */
-      if (ext_index)
-       ext_index = (strspn (infile + ext_index + 1, "yY")) ? ext_index : 0;
-      if (ext_index)
-       compute_exts_from_gf (infile + ext_index);
-
-      return;
-    }
-
-  /* If neither -o nor --file-prefix were specified, and the input
-     file is foo.y, BASE_NAME is `foo.tab', and SHORT_BASE_NAME is
-     `foo'.
-
-     If --yacc is used, do as if the input file was `y.y'.  */
-  {
-    const char *name_base = yacc_flag ? "y.y" : infile;
-
-    /* BASE_LENGTH gets length of BASE_NAME, sans ".y" suffix if any.  */
-
-    base_length = strlen (name_base);
-
-    ext_index = get_extension_index (name_base);
-    /* If the initial segment of extension contains a 'y' or a 'Y', I assume
-       that it is a yacc or bison grammar file.  */
-    if (ext_index)
-      ext_index = (strspn (name_base + ext_index + 1, "yY")) ? ext_index : 0;
-    if (ext_index)
-      {
-       base_length -= strlen (name_base + ext_index);
-       compute_exts_from_gf (name_base + ext_index);
-      }
-
-    short_base_length = base_length;
-    short_base_name = strndup (name_base, short_base_length);
+      if (spec_file_prefix)
+       {
+         /* If --file-prefix=foo was specified, SHORT_BASE_NAME =
+            `foo'.  */
+         short_base_name = xstrdup (spec_file_prefix);
+       }
+      else if (yacc_flag)
+       {
+         /* If --yacc, then the output is `y.tab.c'. */
+         short_base_name = xstrdup ("y");
+       }
+      else
+       {
+         /* Otherwise, the short base name is computed from the input
+            grammar: `foo/bar.yy' => `bar'.  */
+         filename_split (grammar_file, &base, &tab, &ext);
+         short_base_name =
+           xstrndup (base,
+                     (strlen (base) - (ext ? strlen (ext) : 0)));
+       }

 
 

-    base_name = XMALLOC (char,
-                        strlen (short_base_name) + strlen (EXT_TAB) + 1);
-    stpcpy (stpcpy (base_name, short_base_name), EXT_TAB);
+      full_base_name = xmalloc (strlen (short_base_name)
+                               + strlen (TAB_EXT) + 1);
+      stpcpy (stpcpy (full_base_name, short_base_name), TAB_EXT);

 
 

-    return;
-  }
+      /* Compute the extensions from the grammar file name.  */
+      filename_split (grammar_file, &base, &tab, &ext);
+      if (ext && !yacc_flag)
+       compute_exts_from_gf (ext);
+    }

 }
 
 }
 

-/*-------------------------------------------------------.
-| Close the open files, compute the output files names.  |
-`-------------------------------------------------------*/
+
+/* Compute the output file names.  Warn if we detect conflicting
+   outputs to the same file.  */

 
 void
 compute_output_file_names (void)
 {
 
 void
 compute_output_file_names (void)
 {

+  char const *name[4];
+  int i;
+  int j;
+  int names = 0;
+

   compute_base_names ();
 
   /* If not yet done. */
   compute_base_names ();
 
   /* If not yet done. */


@@ -428,95 +308,31 @@ compute_output_file_names (void)
   if (!header_extension)
     header_extension = ".h";
 
   if (!header_extension)
     header_extension = ".h";
 

-  /* It the defines filename if not given, we create it.  */
-  if (!spec_defines_file)
-    spec_defines_file = stringappend (base_name, header_extension);
-
-  /* It the graph filename if not given, we create it.  */
-  if (!spec_graph_file)
-    spec_graph_file = stringappend (short_base_name, ".vcg");
-
-  spec_verbose_file = stringappend (short_base_name, EXT_OUTPUT);
-
-  attrsfile = stringappend (short_base_name, EXT_STYPE_H);
-#ifndef MSDOS
-  attrsfile = stringappend (attrsfile, header_extension);
-#endif /* MSDOS */
-
-}
-
-/*-----------------------------------------------------------------.
-| Open the input file.  Look for the skeletons.  Find the names of |
-| the output files.  Prepare the obstacks.                         |
-`-----------------------------------------------------------------*/
-
-void
-open_files (void)
-{
-  finput = xfopen (infile, "r");
-
-  /* Initialize the obstacks. */
-  obstack_init (&action_obstack);
-  obstack_init (&attrs_obstack);
-  obstack_init (&table_obstack);
-  obstack_init (&defines_obstack);
-  obstack_init (&guard_obstack);
-  obstack_init (&output_obstack);
-}
-
+  name[names++] = parser_file_name =
+    spec_outfile ? spec_outfile : concat2 (full_base_name, src_extension);

 
 

-
-/*-----------------------.
-| Close the open file..  |
-`-----------------------*/
-
-void
-close_files (void)
-{
-  xfclose (finput);
-}
-
-/*---------------------------.
-| Produce the output files.  |
-`---------------------------*/
-
-void
-output_files (void)
-{
-  /* Output the main file.  */
-  if (spec_outfile)
-    obstack_save (&table_obstack, spec_outfile);
-  else
-    obstack_save (&table_obstack, stringappend (base_name, src_extension));
-  obstack_free (&table_obstack, NULL);
-
-  /* Output the header file if wanted. */

   if (defines_flag)
   if (defines_flag)

-    defines_obstack_save (spec_defines_file);
-  obstack_free (&defines_obstack, NULL);
-
-#if 0
-  /* Seems to be invalid now --akim. */
+    {
+      if (! spec_defines_file)
+       spec_defines_file = concat2 (full_base_name, header_extension);
+      name[names++] = spec_defines_file;
+    }

 
 

-  /* If we output only the table, dump the actions in ACTFILE. */
-  if (no_parser_flag)
-    obstack_save (&action_obstack, stringappend (short_base_name, ".act"));
-  obstack_free (&action_obstack, NULL);
-#endif
+  if (graph_flag)
+    {
+      if (! spec_graph_file)
+       spec_graph_file = concat2 (short_base_name, ".vcg");
+      name[names++] = spec_graph_file;
+    }

 
 

-  /* If we produced a semantic parser ATTRS_OBSTACK must be dumped
-     into its own file, ATTTRSFILE.  */
-  if (semantic_parser)
+  if (report_flag)

     {
     {

-      char *temp_name;
-
-      obstack_save (&attrs_obstack, attrsfile);
-      obstack_free (&attrs_obstack, NULL);
-      temp_name = stringappend (short_base_name, EXT_GUARD_C);
-#ifndef MSDOS
-      temp_name = stringappend (temp_name, src_extension);
-#endif /* MSDOS */
-      obstack_save (&guard_obstack, temp_name);
-      obstack_free (&guard_obstack, NULL);
+      spec_verbose_file = concat2 (short_base_name, OUTPUT_EXT);
+      name[names++] = spec_verbose_file;

     }
     }

+
+  for (j = 0; j < names; j++)
+    for (i = 0; i < j; i++)
+      if (strcmp (name[i], name[j]) == 0)
+       warn (_("conflicting outputs to file %s"), quote (name[i]));

 }
 }