Re: [libvirt PATCH v2 01/12] glibcompat: Add G_GNUC_UNUSED to g_auto* definitions for clang

On Fri, 2021-09-10 at 11:53 +0100, Daniel P. Berrangé wrote: > On Fri, Sep 10, 2021 at 12:45:43PM +0200, Tim Wiederhake wrote: > > Workaround for a bug in clang. Clang emits an unused-variable > > warning > > if the variable is only accessed on scope exit by a destructor > > function. > > Note that gcc does not exhibit this behavior. > > > > See https://bugs.llvm.org/show_bug.cgi?id=3888 and > > https://bugs.llvm.org/show_bug.cgi?id=43482. > > > > Signed-off-by: Tim Wiederhake <twiederh(a)redhat.com&gt; > > --- > >  src/util/glibcompat.h | 19 +++++++++++++++++++ > >  1 file changed, 19 insertions(+) > > > > diff --git a/src/util/glibcompat.h b/src/util/glibcompat.h > > index 697687b967..ea486e32d5 100644 > > --- a/src/util/glibcompat.h > > +++ b/src/util/glibcompat.h > > @@ -86,3 +86,22 @@ char *vir_g_strdup_vprintf(const char *msg, > > va_list args) > >  #define g_fsync vir_g_fsync > >   > >  void vir_g_source_unref(GSource *src, GMainContext *ctx); > > + > > +/* > > + * Workaround for a bug in clang. Clang emits an unused-variable > > warning if the > > + * variable is only accessed on scope exit by a destructor > > function. See > > + * https://bugs.llvm.org/show_bug.cgi?id=3888 and > > + * https://bugs.llvm.org/show_bug.cgi?id=43482. > > + */ > > +#if defined(__clang__) > > +# undef g_autoptr > > +# define g_autoptr(TypeName) > > _GLIB_CLEANUP(_GLIB_AUTOPTR_FUNC_NAME(TypeName)) > > _GLIB_AUTOPTR_TYPENAME(TypeName) G_GNUC_UNUSED > > +# undef g_autolist > > +# define g_autolist(TypeName) > > _GLIB_CLEANUP(_GLIB_AUTOPTR_LIST_FUNC_NAME(TypeName)) > > _GLIB_AUTOPTR_LIST_TYPENAME(TypeName) G_GNUC_UNUSED > > +# undef g_autoslist > > +# define g_autoslist(TypeName) > > _GLIB_CLEANUP(_GLIB_AUTOPTR_SLIST_FUNC_NAME(TypeName)) > > _GLIB_AUTOPTR_SLIST_TYPENAME(TypeName) G_GNUC_UNUSED > > +# undef g_autoqueue > > +# define g_autoqueue(TypeName) > > _GLIB_CLEANUP(_GLIB_AUTOPTR_QUEUE_FUNC_NAME(TypeName)) > > _GLIB_AUTOPTR_QUEUE_TYPENAME(TypeName) G_GNUC_UNUSED > > +# undef g_auto > > +# define g_auto(TypeName) > > _GLIB_CLEANUP(_GLIB_AUTO_FUNC_NAME(TypeName)) TypeName > > G_GNUC_UNUSED > > +#endif /* __clang__ */ > > This patch should not be needed anymore afaik since we addressed the > problems that were triggering clang. > Did you see patches 9 to 12? They introduce more "only used on scope exit" variables that trigger clangs warning otherwise.