Debugging gcc 4.9 build failure

2nd attempt to post to list; 1st one was rejected

My first submission to the list - a progress report on my
efforts to build gcc 4.9

The gcc 4.9.1 build fails in the same place as the 4.9.0
build did; I have abandoned 4.9.0 and will 
concentrate on 4.9.1. 

The problem occurs when building the Ada runtime library.
The offender is gcc/ada/adaint.c, which fails to compile because the definitions

#define UNICODE
#define _UNICODE

in the dependent include file mingw32.h seem to have no
effect.

I stripped adaint.c and all dependent include files into
a test directory and shrank adaint.c into a minimal demo of the compile error
using the command line from the log file that was used to compile it for the
main build. I renamed and copied dependent system include files into the test
directory and renamed them in the including files so that I could make any
necessary tweaks to them without disturbing the original include files.

The final result is that there is nothing wrong with
anything in the gcc/ada directory that is causing the build failure. The
UNICODE and _UNICODE definitions in the dependent include file mingw32.h are
meaningless; they do not reach _mingw32.h because a previous inclusion of
<sys/stat.h> pulls in _mingw32.h at a point where UNICODE and _UNICODE
are not defined.

The include structure is same as that used in 4.8.3,
which builds successfully; so the problem is upstream. My next step is to
locate the point where the 4.9.0 build process fails to make the definitions
that 4.8.3 makes. 

 		 	   		  
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