gcc.c (modify_target): New variable and struct.

	* gcc.c (modify_target): New variable and struct.
	(process_command): Handle MODIFY_TARGET_NAME.
	* tm.texi (MODIFY_TARGET_NAME): Add documentation for new macro.
	* config/pa/pa.h (MODIFY_TARGET_NAME): New macro.

From-SVN: r36555

gcc/ChangeLog

 Wed Sep 20 15:39:14 2000  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
+	* gcc.c (modify_target): New variable and struct.
+	(process_command): Handle MODIFY_TARGET_NAME.
+	* tm.texi (MODIFY_TARGET_NAME): Add documentation for new macro.
+	* config/pa/pa.h (MODIFY_TARGET_NAME): New macro.
+
 	* c-decl.c (finish_decl): Add else's to avoid referencing
 	TYPE_DOMAIN of an ERROR_MARK.
 

gcc/config/pa/pa.h

@@ -326,6 +326,15 @@ extern int target_flags;
 #define LIB_SPEC "%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}"
 #endif
 
+/* This macro defines command-line switches that modify the default
+   target name.
+
+   The definition is be an initializer for an array of structures.  Each
+   array element has have three elements: the switch name, one of the
+   enumeration codes ADD or DELETE to indicate whether the string should be
+   inserted or deleted, and the string to be inserted or deleted. */
+#define MODIFY_TARGET_NAME {{"-32", DELETE, "64"}, {"-64", ADD, "64"}}
+
 /* Make gcc agree with <machine/ansi.h> */
 
 #define SIZE_TYPE "unsigned int"

gcc/gcc.c

@@ -164,6 +164,21 @@ static const char *cross_compile = "1";
 static const char *cross_compile = "0";
 #endif
 
+#ifdef MODIFY_TARGET_NAME
+
+/* Information on how to alter the target name based on a command-line
+   switch.  The only case we support now is simply appending or deleting a
+   string to or from the end of the first part of the configuration name.  */
+
+struct modify_target
+{
+  const char *sw;
+  enum add_del {ADD, DELETE} add_del;
+  const char *str;
+}
+modify_target[] = MODIFY_TARGET_NAME;
+#endif
+ 
 /* The number of errors that have occurred; the link phase will not be
    run if this is non-zero.  */
 static int error_count = 0;
@@ -2832,6 +2847,7 @@ process_command (argc, argv)
      const char *const *argv;
 {
   register int i;
+  unsigned int j;
   const char *temp;
   char *temp1;
   const char *spec_lang = 0;
@@ -2839,6 +2855,9 @@ process_command (argc, argv)
   int have_c = 0;
   int have_o = 0;
   int lang_n_infiles = 0;
+#ifdef MODIFY_TARGET_NAME
+  int is_modify_target_name;
+#endif
 
   GET_ENV_PATH_LIST (gcc_exec_prefix, "GCC_EXEC_PREFIX");
 
@@ -3005,6 +3024,7 @@ process_command (argc, argv)
 
   /* Scan argv twice.  Here, the first time, just count how many switches
      there will be in their vector, and how many input files in theirs.
+     Also parse any switches that determine the configuration name, such as -b.
      Here we also parse the switches that cc itself uses (e.g. -v).  */
 
   for (i = 1; i < argc; i++)
@@ -3316,6 +3336,46 @@ process_command (argc, argv)
 
 	    default:
 	    normal_switch:
+
+#ifdef MODIFY_TARGET_NAME
+	      is_modify_target_name = 0;
+
+	      for (j = 0;
+		   j < sizeof modify_target / sizeof modify_target[0]; j++)
+		if (! strcmp (argv[i], modify_target[j].sw))
+		  {
+		    char *new_name
+		      = (char *) xmalloc (strlen (modify_target[j].str)
+					  + strlen (spec_machine));
+		    const char *p, *r;
+		    char *q;
+		    int made_addition = 0;
+
+		    is_modify_target_name = 1;
+		    for (p = spec_machine, q = new_name; *p != 0; )
+		      {
+			if (modify_target[j].add_del == DELETE
+			    && (! strncmp (q, modify_target[j].str,
+					   strlen (modify_target[j].str))))
+			  p += strlen (modify_target[j].str);
+			else if (modify_target[j].add_del == ADD
+				 && ! made_addition && *p == '-')
+			  {
+			    for (r = modify_target[j].str; *r != 0; )
+			      *q++ = *r++;
+			    made_addition = 1;
+			  }
+
+			*q++ = *p++;
+		      }
+
+		    spec_machine = new_name;
+		  }
+
+	      if (is_modify_target_name)
+		break;
+#endif		      
+
 	      n_switches++;
 
 	      if (SWITCH_TAKES_ARG (c) > (p[1] != 0))
@@ -3413,6 +3473,17 @@ process_command (argc, argv)
   for (i = 1; i < argc; i++)
     {
       /* Just skip the switches that were handled by the preceding loop.  */
+#ifdef MODIFY_TARGET_NAME
+      is_modify_target_name = 0;
+
+      for (j = 0; j < sizeof modify_target / sizeof modify_target[0]; j++)
+	if (! strcmp (argv[i], modify_target[j].sw))
+	  is_modify_target_name = 1;
+
+      if (is_modify_target_name)
+	;
+      else
+#endif
       if (! strncmp (argv[i], "-Wa,", 4))
 	;
       else if (! strncmp (argv[i], "-Wp,", 4))

gcc/tm.texi

@@ -387,6 +387,32 @@ comes before @code{SYSTEM_INCLUDE_DIR} in the search order.
 Cross compilers do not use this macro and do not search either
 @file{/usr/local/include} or its replacement.
 
+@findex MODIFY_TARGET_NAME
+@item MODIFY_TARGET_NAME
+Define this macro if you with to define command-line switches that modify the
+default target name
+
+For each switch, you can include a string to be appended to the first
+part of the configuration name or a string to be deleted from the
+configuration name, if present.  The definition should be an initializer
+for an array of structures.  Each array element should have three
+elements: the switch name (a string constant, including the initial
+dash), one of the enumeration codes @code{ADD} or @code{DELETE} to
+indicate whether the string should be inserted or deleted, and the string
+to be inserted or deleted (a string constant).
+
+For example, on a machine where @samp{64} at the end of the
+configuration name denotes a 64-bit target and you want the @samp{-32}
+and @samp{-64} switches to select between 32- and 64-bit targets, you would
+code
+
+@smallexample
+#define MODIFY_TARGET_NAME \
+  @{ @{ "-32", DELETE, "64"@}, \
+     @{"-64", ADD, "64"@}@}
+@end smallexample
+
+
 @findex SYSTEM_INCLUDE_DIR
 @item SYSTEM_INCLUDE_DIR
 Define this macro as a C string constant if you wish to specify a