[Bug c/105858] New: MinGW-w64 64-bit build with --libstdcxx-pch: fatal error: cannot write PCH file: required memory segment unavailable

["brechtsanders at users dot sourceforge.net" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105858

            Bug ID: 105858
           Summary: MinGW-w64 64-bit build with --libstdcxx-pch: fatal
                    error: cannot write PCH file: required memory segment
                    unavailable
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: brechtsanders at users dot sourceforge.net
  Target Milestone: ---

When building the Windows 64-bit version of GCC 12.1.0 against MinGW-w64 build
with --libstdcxx-pch the following error occurs:

In file included from
R:/winlibs64_stage/gcc-12.1.0/libstdc++-v3/include/precompiled/extc++.h:82:
R:/winlibs64_stage/gcc-12.1.0/build_mingw/x86_64-w64-mingw32/libstdc++-v3/include/ext/enc_filebuf.h:63:1:
fatal error: cannot write PCH file: required memory segment unavailable
   63 | } // namespace
      | ^
compilation terminated.

This error does not happen when building the 32-bit version.