Compiling in Visual Studio?

I'm trying to use this in a project I have in Visual Studio, but as a C++ beginner I'm at the end of my wits for now.

The header files I managed to make work by doing this in a newly created rawspeedconfig.h, based on some info from various places:

#ifdef _MSC_VER
#define __attribute__(x) 
#define __builtin_unreachable(x)
#define ASAN_REGION_IS_POISONED(x) 0
#define __PRETTY_FUNCTION__ __FUNCSIG__
#endif

I also copied a bunch of the code from config.h.in to my rawspeedconfig.h. After that the only remaining issue after compiling was unresolved symbols (all the actual function bodies etc).

But when I include all the other sources, it will just spit out a billion syntax errors and die. Most if it seems to be due to some gcc related stuff. I wanted to use this code as a submodule in git so I don't want to just go rogue and replace all the GCC stuff (and I'm not sure if I should either, since I would likely end up breaking something).

Is there any way at all to compile this code without gcc?

I was thinking of compiling with gcc and using the static library inside Visual Studio but I then read that this is impossible, so I'm back to zero.

Start by comparing the manually created rawspeedconfig.h with config.h.in, then reproduce the syntax errors from the other sources in Visual Studio. Determine the scope of the GCC-specific code and whether the existing CMake/build setup exposes a supported non-GCC path. Done means the project has a working Visual Studio build path or clearly documented support limitations.