Rewrite and redesign codegen and feature system

Also switch to somewhat proper C23 flags while we're at it.

This is a huge change. It took me forever, in between being really busy.
Sorry about that. But the good news is I'm now free to start integrating
the various patches that have accumulated since last release. Well, at
least in between still being really busy. Gotta manage expectations.

The main benefit of introducing GAMESPECIFIC() is that features
that don't apply to a particular game no longer show up *at all*, and
less time is wasted on init. It also enables a cool optimisation wherein
unnecessary REQUIRE_GAMEDATA() checks can elided at compile time
whenever the gamedata is known up-front to always exist in supported
games.

The DEF_FEAT_CVAR macro family meanwhile makes it easier to manage the
lifecycle of cvars/ccmds, with less manual registering, unhiding and
such.

Originally I was going to try and just hack these features into the
existing codegen abomination, but it just got too terrible. This rewrite
should make it easier to continue tweaking codegen behaviour in future.
It also has slightly better error messages.

1 files changed, 9 insertions, 1 deletions

diff --git a/src/os.h b/src/os.h
index cbecf2c..ca376b7 100644
--- a/src/os.h
+++ b/src/os.h
@@ -1,5 +1,5 @@
 /*
- * Copyright © 2024 Michael Smith <mikesmiffy128@gmail.com>
+ * Copyright © 2025 Michael Smith <mikesmiffy128@gmail.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -17,6 +17,10 @@
 #ifndef INC_OS_H
 #define INC_OS_H
 
+#ifdef INC_LANGEXT_H // we can't rely on include order!
+#undef noreturn // ugh, this breaks Windows headers. how annoying. temp-undef it
+#endif
+
 #include <string.h>
 #include <sys/stat.h> // XXX: try abstracting stat() and avoiding ucrt dep here
 
@@ -239,6 +243,10 @@ bool os_mprot(void *addr, int len, int mode);
  */
 void os_randombytes(void *buf, int sz);
 
+#ifdef INC_LANGEXT_H
+#define noreturn _Noreturn void // HACK: put this back if undef'd above
+#endif
+
 #endif
 
 // vi: sw=4 ts=4 noet tw=80 cc=80