Make GCC_EXEC_PREFIX work again

From-SVN: r18856

gcc/ChangeLog

+Fri Mar 27 16:04:49 1998  Michael Meissner  <meissner@cygnus.com>
+
+	* gcc.c (set_std_prefix): Add declaration.
+	(process_command): If GCC_EXEC_PREFIX is set, remove /lib/gcc-lib/
+	suffix, and update the standard prefix prefix.c uses.
+
+	* prefix.c (std_prefix): New global to hold default prefix value.
+	(get_key_value): Change to use std_prefix instead of PREFIX.
+	(translate_name): Ditto.
+	(update_path): Ditto.
+	(get_key_value): Release allocated scratch storage.
+	(set_std_prefix): New function to reset the standard prefix.
+
 Fri Mar 27 18:08:21 1998  J"orn Rennecke <amylaar@cygnus.co.uk>
 
 	* sh.c (find_barrier): Fix calculations for alignment increase.

gcc/gcc.c

@@ -51,6 +51,7 @@ extern int pexecute PROTO ((const char *, char * const *, const char *,
 			    const char *, char **, char **, int));
 extern int pwait PROTO ((int, int *, int));
 extern char *update_path PROTO((char *, char *));
+extern void set_std_prefix PROTO((char *, int));
 /* Flag arguments to pexecute.  */
 #define PEXECUTE_FIRST   1
 #define PEXECUTE_LAST    2
@@ -2378,6 +2379,20 @@ process_command (argc, argv)
 
   if (gcc_exec_prefix)
     {
+      int len = strlen (gcc_exec_prefix);
+      if (len > sizeof ("/lib/gcc-lib/")-1
+	  && (gcc_exec_prefix[len-1] == '/'
+	      || gcc_exec_prefix[len-1] == DIR_SEPARATOR))
+	{
+	  temp = gcc_exec_prefix + len - sizeof ("/lib/gcc-lib/") + 1;
+	  if ((*temp == '/' || *temp == DIR_SEPARATOR)
+	      && strncmp (temp+1, "lib", 3) == 0
+	      && (temp[4] == '/' || temp[4] == DIR_SEPARATOR)
+	      && strncmp (temp+5, "gcc-lib", 7) == 0)
+	    len -= sizeof ("/lib/gcc-lib/") - 1;
+	}
+
+      set_std_prefix (gcc_exec_prefix, len);
       add_prefix (&exec_prefixes, gcc_exec_prefix, "GCC", 0, 0, NULL_PTR);
       add_prefix (&startfile_prefixes, gcc_exec_prefix, "GCC", 0, 0, NULL_PTR);
     }

gcc/prefix.c

 /* Utility to update paths from internal to external forms.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998 Free Software Foundation, Inc.
 
 This file is part of GNU CC.
 
@@ -76,6 +76,8 @@ Boston, MA 02111-1307, USA.  */
 
 #include "gansidecl.h"
 
+static char *std_prefix = PREFIX;
+
 static char *get_key_value	PROTO((char *));
 static char *translate_name	PROTO((char *));
 static char *concat		PVPROTO((char *, ...));
@@ -93,16 +95,20 @@ get_key_value (key)
      char *key;
 {
   char *prefix = 0;
+  char *temp = 0;
 
 #ifdef _WIN32
   prefix = lookup_key (key);
 #endif
 
   if (prefix == 0)
-    prefix = getenv (concat (key, "_ROOT", NULL_PTR));
+    prefix = getenv (temp = concat (key, "_ROOT", NULL_PTR));
 
   if (prefix == 0)
-    prefix = PREFIX;
+    prefix = std_prefix;
+
+  if (temp)
+    free (temp);
 
   return prefix;
 }
@@ -259,7 +265,7 @@ translate_name (name)
     {
       prefix = get_key_value (key);
       if (prefix == 0)
-	prefix = PREFIX;
+	prefix = std_prefix;
     }
   else
     {
@@ -289,12 +295,12 @@ update_path (path, key)
      char *path;
      char *key;
 {
-  if (! strncmp (path, PREFIX, strlen (PREFIX)) && key != 0)
+  if (! strncmp (path, std_prefix, strlen (std_prefix)) && key != 0)
     {
       if (key[0] != '$')
 	key = concat ("@", key, NULL_PTR);
 
-      path = concat (key, &path[strlen (PREFIX)], NULL_PTR);
+      path = concat (key, &path[strlen (std_prefix)], NULL_PTR);
 
       while (path[0] == '@' || path[0] == '$')
 	path = translate_name (path);
@@ -315,3 +321,12 @@ update_path (path, key)
 
   return path;
 }
+
+/* Reset the standard prefix */
+void
+set_std_prefix (prefix, len)
+     char *prefix;
+     int len;
+{
+  std_prefix = save_string (prefix, len);
+}