Mingw-w64 is an advancement of the original mingw.org project, created to support the GCC compiler on Windows systems. It has forked it in 2007 in order to provide support for 64 bits and new APIs. It has since then gained widespread use and distribution.
The development and community are very active and welcoming with new contributors every month and simple installers.
initial v5 Release: 2016-10-19
You can also look at the full list of versions.
Mingw-w64 interacts a lot with other projects in order to help everyone move forward. Contributions have been going to and coming from these projects:
crt: Build the SEH inline assembly with clang 7
Updated imported headers to current Wine version.
Thanks for testing with the latest version!
With GCC 8.1 Thread model: posix gcc version 8.1.0 (x86_64-posix-seh-rev0, Built by MinGW-W64 project) test756.f90:1:0: program main internal compiler error: in gfc_get_symbol_decl, at fortran/trans-decl.c:1787
I can also report the same abort occurs with a different target: character(len=:), target, allocatable :: name6 the difference being allocatable length vs. fixed length.
gfortran internal compiler error
This happens with binutils 2.31.1 which fixed the bug you linked to.
This seems is same with https://sourceforge.net/p/mingw-w64/bugs/747/
gcc is 8.2.0 from msys2, wx is from msys2, but this happens with any version of wx in any configuration.
What's the output of gcc -v command? Which version of WX? How you install it? Using pacman? What the WX build configuration (gcc_dll\mswu\build.cfg)? or options passed to after mingw32-make -f makefile.gcc when build WX?