Added compile-time checks for thread locals with -no-crt

Now using any thread-local variables with -no-crt enabled
will cause a compiler error, unless -no-thread-local is
given.

Also fixed a minor typo in a comment.

src/build_settings.cpp

@@ -2133,7 +2133,21 @@ gb_internal bool init_build_paths(String init_filename) {
 		case TargetOs_openbsd:
 		case TargetOs_netbsd:
 		case TargetOs_haiku:
-			gb_printf_err("-no-crt on unix systems requires either -default-to-nil-allocator or -default-to-panic-allocator to also be present because the default allocator requires crt\n");
+			gb_printf_err("-no-crt on unix systems requires either -default-to-nil-allocator or -default-to-panic-allocator to also be present, because the default allocator requires crt\n");
+			return false;
+		}
+	}
+
+	if (build_context.no_crt && !build_context.no_thread_local && !build_context.ODIN_DEFAULT_TO_NIL_ALLOCATOR) {
+		switch (build_context.metrics.os) {
+		case TargetOs_linux:
+		case TargetOs_darwin:
+		case TargetOs_essence:
+		case TargetOs_freebsd:
+		case TargetOs_openbsd:
+		case TargetOs_netbsd:
+		case TargetOs_haiku:
+			gb_printf_err("-no-crt on unix systems requires either -default-to-nil-allocator or -no-thread-local to also be present, because the temporary allocator is a thread local, which are inaccessible without CRT initializing TLS\n");
 			return false;
 		}
 	}

src/check_expr.cpp

@@ -1044,7 +1044,7 @@ gb_internal AstPackage *get_package_of_type(Type *type) {
 }
 
 
-// NOTE(bill): 'content_name' is for debugging and error messages
+// NOTE(bill): 'context_name' is for debugging and error messages
 gb_internal void check_assignment(CheckerContext *c, Operand *operand, Type *type, String context_name) {
 	check_not_tuple(c, operand);
 	if (operand->mode == Addressing_Invalid) {
@@ -1822,6 +1822,19 @@ gb_internal Entity *check_ident(CheckerContext *c, Operand *o, Ast *n, Type *nam
 		break;
 
 	case Entity_Variable:
+		if (e->kind == Entity_Variable && build_context.no_crt && !build_context.no_thread_local && e->Variable.thread_local_model != "") {
+			switch (build_context.metrics.os) {
+			case TargetOs_linux:
+			case TargetOs_darwin:
+			case TargetOs_essence:
+			case TargetOs_freebsd:
+			case TargetOs_openbsd:
+			case TargetOs_netbsd:
+			case TargetOs_haiku:
+				Token token = ast_token(n);
+				error(token, "Illegal usage of thread locals: '%.*s'", LIT(e->token.string));
+			}
+		}
 		e->flags |= EntityFlag_Used;
 		if (type == t_invalid) {
 			o->type = t_invalid;

src/main.cpp

@@ -2334,6 +2334,10 @@ gb_internal void print_show_help(String const arg0, String command, String optio
 			print_usage_line(2, "Sets the default allocator to be the nil_allocator, an allocator which does nothing.");
 		}
 
+		if (print_flag("-default-to-panic-allocator")) {
+			print_usage_line(2, "Sets the default allocator to be the panic_allocator, an allocator which calls panic() on any allocation attempt.");
+		}
+
 		if (print_flag("-define:<name>=<value>")) {
 			print_usage_line(2, "Defines a scalar boolean, integer or string as global constant.");
 			print_usage_line(2, "Example: -define:SPAM=123");