[Bug bootstrap/39622] New: Missing -isystem include-fixed when building canadian cross libgcc

["georgjohann at web dot de" <gcc-bugzilla at gcc dot gnu dot org>]

The following is just a verbatim copy of
   http://gcc.gnu.org/ml/gcc-help/2009-04/msg00023.html
For details and possible patch follow the link.

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I'd like to build a canadian cross configured with
  --host=i586-mingw32
  --build=i686-linux-gnu

Everything goes fine except building libgcc because limits.h cannot be found,
as include-fixed is not in include path.

The problem looks like this: For a native build, i.e. host=build,
libgcc/Makefile sets CC to
> CC = [target-gcc-build-dir]/./gcc/xgcc -B[target-gcc-build-dir]/./gcc/
but for host != build it is
> CC = [target-gcc]
without adding [target-gcc-build-dir]/./gcc/include-fixed
to the include directory search path my means of -isystem.
However, this directory contains the limits.h.


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           Summary: Missing -isystem include-fixed when building canadian
                    cross libgcc
           Product: gcc
           Version: 4.3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: georgjohann at web dot de
 GCC build triplet: i686-linux-gnu
  GCC host triplet: i586-mingw32
GCC target triplet: any


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39622