Successful build of 4.2.0 RC2 for target=avr host=mingw

[Eric Weddington <eweddington at cso dot atmel dot com>]

...well sort of.

If I use the releases straight, I get this:

In file included from ../../gcc-4.2.0-20070430/gcc/libgcc2.c:35:
./tm.h:5:29: error: config/avr/avr.h: No such file or directory
./tm.h:6:28: error: config/dbxelf.h: No such file or directory
./tm.h:7:31: error: config/tm-dwarf2.h: No such file or directory
./tm.h:8:23: error: defaults.h: No such file or directory
In file included from ../../gcc-4.2.0-20070430/gcc/libgcc2.c:65:
../../gcc-4.2.0-20070430/gcc/libgcc2.h:255:3: error: #error "expand the
table"
../../gcc-4.2.0-20070430/gcc/libgcc2.c: In function '__mulhi3':
../../gcc-4.2.0-20070430/gcc/libgcc2.c:536: error: 'BITS_PER_UNIT'
undeclared (first use in this function)
../../gcc-4.2.0-20070430/gcc/libgcc2.c:536: error: (Each undeclared
identifier is reported only once
../../gcc-4.2.0-20070430/gcc/libgcc2.c:536: error: for each function it
appears in.)
make[3]: *** [libgcc/./_muldi3.o] Error 1
make[3]: Leaving directory `/c/avrdev/gcc/build/gcc'
make[2]: *** [stmp-multilib] Error 2
make[2]: Leaving directory `/c/avrdev/gcc/build/gcc'
make[1]: *** [all-gcc] Error 2
make[1]: Leaving directory `/c/avrdev/gcc/build'
make: *** [all] Error 2

However, this is just the "trailing forward slash not allowed in include
path" on MinGW bug, #22133, which is still not fixed:
<http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22133>
(See comment trail for link to patch.)

After patching GCC to fix that bug, it builds successfully with the
following configuration:

Using built-in specs.
Target: avr
Configured with: ../gcc-4.2.0-20070430/configure
--prefix=/c/WinAVR-GCC-4.2.0 --target=avr --enable-languages=c,c++
--with-dwarf2 --enable-win32-registry=WinAVR-2007xxyy --disable-nls
--with-gmp=/usr/local --with-mpfr=/usr/local --enable-doc --disable-libssp
Thread model: single
gcc version 4.2.0 20070430 (prerelease) (WinAVR 2007xxyy)

This is building from the "core" .bz2 and "c++" .bz2 packages.

Eric Weddington