[Bug driver/51844] New: [4.7 regression] configuring with --with-gxx-include-dir=<absolute path> adds a relative (non-existing) C++ include dir

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51844

             Bug #: 51844
           Summary: [4.7 regression] configuring with
                    --with-gxx-include-dir=<absolute path> adds a relative
                    (non-existing) C++ include dir
    Classification: Unclassified
           Product: gcc
           Version: 4.6.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: doko@gcc.gnu.org


a trunk build configured --with-gxx-include-dir=/usr/include/c++/4.7 adds a
relative include dir, not an absolute one:

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "usr/include/c++/4.7"
ignoring nonexistent directory "usr/include/c++/4.7/x86_64-linux-gnu"
ignoring nonexistent directory "usr/include/c++/4.7/backward"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-linux-gnu/4.7.0/include
 /usr/local/include
 /usr/lib/gcc/x86_64-linux-gnu/4.7.0/include-fixed
 /usr/include
End of search list.