[gjs: 14/21] maint: Use C++ attributes where available

[Cosimo Cecchi <cosimoc src gnome org>]

commit b2e1a39dc0438bd3269492e8fdcf0228e3e55341
Author: Philip Chimento <philip chimento gmail com>
Date:   Sat Jun 1 10:25:02 2019 -0700

    maint: Use C++ attributes where available
    
    The attributes available in C++14 are [[noreturn]],
    [[carries_dependency]], and [[deprecated()]]. We can use these built-in
    attributes instead of relying on the platform-specific defines in GLib.
    
    It would be nice to be able to use future attributes such as
    [[fallthrough]] and let them take effect as compilers implement them; or
    use custom attributes such as [[gjs::jsapi_return_convention]]; but in
    C++14, unknown attributes are not yet guaranteed to be ignored. That
    happens in C++17.

 gi/interface.h                  | 4 ++--
 installed-tests/minijasmine.cpp | 6 +-----
 2 files changed, 3 insertions(+), 7 deletions(-)
---
diff --git a/gi/interface.h b/gi/interface.h
index e10bf561..c67dcc3a 100644
--- a/gi/interface.h
+++ b/gi/interface.h
@@ -121,11 +121,11 @@ class InterfaceInstance
     friend class GIWrapperBase<InterfaceBase, InterfacePrototype,
                                InterfaceInstance>;
 
-    G_GNUC_NORETURN InterfaceInstance(JSContext* cx, JS::HandleObject obj)
+    [[noreturn]] InterfaceInstance(JSContext* cx, JS::HandleObject obj)
         : GIWrapperInstance(cx, obj) {
         g_assert_not_reached();
     }
-    G_GNUC_NORETURN ~InterfaceInstance(void) { g_assert_not_reached(); }
+    [[noreturn]] ~InterfaceInstance(void) { g_assert_not_reached(); }
 };
 
 GJS_JSAPI_RETURN_CONVENTION
diff --git a/installed-tests/minijasmine.cpp b/installed-tests/minijasmine.cpp
index 52960cce..b02a6eb0 100644
--- a/installed-tests/minijasmine.cpp
+++ b/installed-tests/minijasmine.cpp
@@ -31,11 +31,7 @@
 
 #include <gjs/gjs.h>
 
-G_GNUC_NORETURN
-static void
-bail_out(GjsContext *gjs_context,
-         const char *msg)
-{
+[[noreturn]] static void bail_out(GjsContext* gjs_context, const char* msg) {
     g_object_unref(gjs_context);
     g_print("Bail out! %s\n", msg);
     exit(1);