/usr/lib/gcc/i686-w64-mingw32/4.9-win32/install-tools/macro_list is in gcc-mingw-w64-i686 4.9.1-19+14.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | WIN32
WINNT
_cdecl
_fastcall
_stdcall
_thiscall
i386
|