Merge branch 'master' into macharena

core/sys/posix/dlfcn.odin

@@ -8,7 +8,10 @@ when ODIN_OS == .Darwin {
 } else when ODIN_OS == .FreeBSD || ODIN_OS == .NetBSD {
 	foreign import lib "system:dl"
 } else {
-	foreign import lib "system:c"
+	foreign import lib {
+		"system:c",
+		"system:dl",
+	}
 }
 
 // dlfcn.h - dynamic linking

core/sys/posix/posix.odin

@@ -31,7 +31,7 @@ Unimplemented headers:
 - iso646.h | Impossible
 - math.h | See `core:c/libc`
 - mqueue.h | Targets don't seem to have implemented it
-- regex.h | See `core:regex`
+- regex.h | See `core:text/regex`
 - search.h | Not useful in Odin
 - spawn.h | Use `fork`, `execve`, etc.
 - stdarg.h | See `core:c/libc`
@@ -53,6 +53,8 @@ import "base:intrinsics"
 
 import "core:c"
 
+IS_SUPPORTED :: _IS_SUPPORTED
+
 result :: enum c.int {
  	// Use `errno` and `strerror` for more information.
 	FAIL = -1,

core/sys/posix/posix_other.odin

@@ -0,0 +1,10 @@
+#+build !linux
+#+build !darwin
+#+build !netbsd
+#+build !openbsd
+#+build !freebsd
+#+build !haiku
+package posix
+
+_IS_SUPPORTED :: false
+

core/sys/posix/posix_unix.odin

@@ -0,0 +1,5 @@
+#+build linux, darwin, netbsd, openbsd, freebsd, haiku
+package posix
+
+_IS_SUPPORTED :: true
+