I'm currently trying to build GDC for Windows via MSYS2, so that
we can finally have all three compilers on every major operating
system. However, I've been running into a few roadblocks when
doing so, and I'm unsure about how to proceed.
Currently I can successfully build GDC 11, but the resulting
compiler has at least one frontend bug that causes it to crash
when building some GCC-14 modules (specifically cpuid.d, I
believe). Because of that issue, I'm trying to see if GDC 9 would
be a better choice to bootstrap, since GCC seems to recommend it
on one of their pages.
The problem I have now is that some of the gcc builtins are
undefined in GDC 9, resulting in errors like this:
```
../../../../gcc-9.2.0/libphobos/libdruntime/core/thread.d:2430:13: error:
undefined identifier '__builtin_unwind_init'
2430 | __builtin_unwind_init();
| ^
../../../../gcc-9.2.0/libphobos/libdruntime/core/thread.d:3220:16: error:
undefined identifier '__builtin_frame_address'
3220 | return __builtin_frame_address(0);
| ^
...
```
The only forum post I can find of this sort of error was closed
because it looked like a duplicate bug, but I'm unsure if that is
actually the case.
So currently I'm a bit stuck, with no idea how to solve this
frontend issue myself, and no idea which version of GDC would
give me a greater chance of success. I'd be grateful if someone
with more experience could help me solve these issues or provide
any extra advice, so that we can get GDC working on Windows (with
the better debug information that it provides compared to the
other compilers).
