building a recent gcc-gnat on MinGW

[rrr.eee.27@gmail.com]

Starting with gcc-5.1 (and all following versions to 6.2) I get an error when compiling the Ada part of gcc on MinGW(32):

g++ -fno-PIE -c  -DIN_GCC_FRONTEND -g -O2 -DIN_GCC  -DCROSS_DIRECTORY_STRUCTURE   -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual  -Wmissing-format-attribute -Woverloaded-virtual -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings  -Wno-error -DHAVE_CONFIG_H -I. -Iada -I../../gcc-6.2.0/gcc -I../../gcc-6.2.0/gcc/ada -I../../gcc-6.2.0/gcc/../include -I../../gcc-6.2.0/gcc/../libcpp/include -I/mingw/include -I/mingw/include  -I../../gcc-6.2.0/gcc/../libdecnumber -I../../gcc-6.2.0/gcc/../libdecnumber/dpd -I../libdecnumber -I../../gcc-6.2.0/gcc/../libbacktrace   -o ada/adaint.o -MT ada/adaint.o -MMD -MP -MF ada/.deps/adaint.TPo ../../gcc-6.2.0/gcc/ada/adaint.c
../../gcc-6.2.0/gcc/ada/adaint.c: In function 'void __gnat_stat_to_attr(int, char*, file_attributes*)':

../../gcc-6.2.0/gcc/ada/adaint.c:1032:20: error: aggregate 'stat64 statbuf' has incomplete type and cannot be defined

   GNAT_STRUCT_STAT statbuf;
                    ^

It seems that gcc assumes the availability of stat64 in libc even on a 32bit system.

Has anybody seens this problem before and do you know how to circumvent it?

regards
   RE