[Bug 191291] New: [MAINTAINER] devel/mingw32-gcc: Update to 4.8.1, support staging, but doesn't build :(

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191291

            Bug ID: 191291
           Summary: [MAINTAINER] devel/mingw32-gcc: Update to 4.8.1,
                    support staging, but doesn't build :(
           Product: Ports Tree
           Version: Latest
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: cyberbotx at cyberbotx.com

Created attachment 144047
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=144047&action=edit
Incomplete patch

In attempting to update devel/mingw32-gcc to use gcc 4.8.1 and to support
staging, I have encountered a problem. The port refuses to build. I am at a
loss on how to fix this, as I want to make sure the port is updated to handle
staging and not get deprecated at the end of the month.

The first problem I was getting was it saying that it couldn't find stdio.h at
all. After a bit of searching on Google, I found the --with-sysroot configure
option. I had to patch gcc/config.gcc to use /mingw32/include instead of
/mingw/include (since devel/mingw32-bin-msvcrt installs to
${PREFIX}/mingw32/include).

I have attempted to build the port in poudriere.

If I set --with-sysroot to ${PREFIX}, I get the following:

The directory that should contain system headers does not exist:
  /prefix/mingw32-gcc-4.8.1_1/mingw32/include
gmake[2]: *** [stmp-fixinc] Error 1
gmake[2]: Leaving directory
`/wrkdirs/usr/ports/devel/mingw32-gcc/work/build/gcc'
gmake[1]: *** [all-gcc] Error 2
gmake[1]: Leaving directory `/wrkdirs/usr/ports/devel/mingw32-gcc/work/build'
gmake: *** [all] Error 2

If I set --with-sysroot to ${LOCALBASE}, I get the following instead:

/wrkdirs/usr/ports/devel/mingw32-gcc/work/build/./gcc/xgcc
-B/wrkdirs/usr/ports/devel/mingw32-gcc/work/build/./gcc/
-L/wrkdirs/usr/ports/devel/mingw32-gcc/work/build/mingw32/winsup/mingw
-L/wrkdirs/usr/ports/devel/mingw32-gcc/work/build/mingw32/winsup/w32api/lib
-isystem
/wrkdirs/usr/ports/devel/mingw32-gcc/work/gcc-4.8.1/winsup/mingw/include
-isystem
/wrkdirs/usr/ports/devel/mingw32-gcc/work/gcc-4.8.1/winsup/w32api/include
-B/prefix/mingw32-gcc-4.8.1_1/mingw32/bin/
-B/prefix/mingw32-gcc-4.8.1_1/mingw32/lib/ -isystem
/prefix/mingw32-gcc-4.8.1_1/mingw32/include -isystem
/prefix/mingw32-gcc-4.8.1_1/mingw32/sys-include    -g -O2 -pipe
-I/usr/local/include -fno-strict-aliasing -O2
-I../.././..//gcc-4.8.1/libgcc/../winsup/w32api/include -g -O2 -pipe
-I/usr/local/include -fno-strict-aliasing -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE
-W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition  -isystem ./include   -g -DIN_LIBGCC2 -fbuilding-libgcc
-fno-stack-protector   -I. -I. -I../.././gcc -I../.././..//gcc-4.8.1/libgcc
-I../.././..//gcc-4.8.1/libgcc/. -I../.././..//gcc-4.8.1/libgcc/../gcc
-I../.././..//gcc-4.8.1/libgcc/../include
-I../.././..//gcc-4.8.1/libgcc/config/libbid -DENABLE_DECIMAL_BID_FORMAT
-DHAVE_CC_TLS -DUSE_EMUTLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep
-DL_muldi3 -c ../.././..//gcc-4.8.1/libgcc/libgcc2.c
In file included from ../.././..//gcc-4.8.1/libgcc/libgcc2.c:27:0:
../.././..//gcc-4.8.1/libgcc/../gcc/tsystem.h:87:19: fatal error: stdio.h: No
such file or directory
 #include <stdio.h>
                   ^
compilation terminated.
gmake[2]: *** [_muldi3.o] Error 1
gmake[2]: Leaving directory
`/wrkdirs/usr/ports/devel/mingw32-gcc/work/build/mingw32/libgcc'
gmake[1]: *** [all-target-libgcc] Error 2
gmake[1]: Leaving directory `/wrkdirs/usr/ports/devel/mingw32-gcc/work/build'
gmake: *** [all] Error 2 

I am currently at a complete loss as to how to fix this problem. I am hoping
someone well versed in gcc cross-compiling can help me fix this problem.

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