[Bug preprocessor/41943] include search path composition is bogus

["ktietz at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #6 from ktietz at gcc dot gnu dot org  2009-12-06 11:47 -------
By rethinking this issue I came to the point that this would lead to pretty
havy incompatibilities between -pc-mingw32 and -w64-mingw32. Also it would
disallow to use the default /usr/local prefix for installtion without setting
up a sysroot.
So I think to change gcc.c here is the better variant and fixes both venture
targets here. As win32 paths are pretty unique for native windows targets, I
think this patch here is minimal intrusive for *nix targets.

Index: gcc/gcc/gcc.c
===================================================================
--- gcc.orig/gcc/gcc.c  2009-11-26 17:37:26.000000000 +0100
+++ gcc/gcc/gcc.c       2009-12-06 12:37:38.213190000 +0100
@@ -2900,8 +2900,11 @@
 {
   if (!IS_ABSOLUTE_PATH (prefix))
     fatal ("system path '%s' is not absolute", prefix);
-
-  if (target_system_root)
+  if (target_system_root
+#if HAVE_DOS_BASED_FILE_SYSTEM == 1
+      && (!prefix[0] || prefix[1] != ':')
+#endif
+     )
     {
       if (target_sysroot_suffix)
          prefix = concat (target_sysroot_suffix, prefix, NULL);

I tested this patch and it seems to do what you expects it should do.

Cheers,
Kai


-- 

ktietz at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |ktietz at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2009-11-29 20:47:06         |2009-12-06 11:47:02
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41943