[libvirt PATCH] util: squelch G_DEFINE_TYPE volatile warnings with GCC 11

In this previous commit: commit 65491a2dfe00bfcf9f09a8d6eab60234b56c8cc4 Author: Martin Kletzander <mkletzan(a)redhat.com&gt; Date: Thu Nov 12 13:58:53 2020 +0100 Do not disable incompatible-pointer-types-discards-qualifiers We selectively rewrite G_DEFINE_TYPE to avoid warnings about mismatched volatile/non-volatile pointers that appeared with CLang when using GLib2 >= 2.67 We have now just hit the reverse problem, GCC >= 11 has started warning about mismatched volatile/non-volatile pointers but only with GLib2 < 2.67. The new GLib2 avoids the warning, as does older GCC. Signed-off-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; --- src/util/glibcompat.h | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) diff --git a/src/util/glibcompat.h b/src/util/glibcompat.h index 457f6ba797..455324925f 100644 --- a/src/util/glibcompat.h +++ b/src/util/glibcompat.h @@ -22,7 +22,10 @@ #include <glib/gstdio.h> #include <glib-object.h> -#if defined(__clang__) && GLIB_CHECK_VERSION(2, 67, 0) +#if GLIB_CHECK_VERSION(2, 67, 0) + +# if defined(__clang__) + /* * Clang detects (valid) issue in G_DEFINE_TYPE and derivatives starting with * glib >= 2.67.0. See https://gitlab.gnome.org/GNOME/glib/-/issues/600 @@ -34,16 +37,36 @@ * is defined in glib (with a very low probability of being changed thanks to a * comment above it). */ -# undef _G_DEFINE_TYPE_EXTENDED_BEGIN +# undef _G_DEFINE_TYPE_EXTENDED_BEGIN -# define _G_DEFINE_TYPE_EXTENDED_BEGIN(TypeName, type_name, TYPE_PARENT, flags) \ +# define _G_DEFINE_TYPE_EXTENDED_BEGIN(TypeName, type_name, TYPE_PARENT, flags) \ _Pragma("GCC diagnostic push") \ _Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types-discards-qualifiers\"") \ _G_DEFINE_TYPE_EXTENDED_BEGIN_PRE(TypeName, type_name, TYPE_PARENT) \ _G_DEFINE_TYPE_EXTENDED_BEGIN_REGISTER(TypeName, type_name, TYPE_PARENT, flags) \ _Pragma("GCC diagnostic pop") -#endif /* __clang__ */ +# endif /* __clang__ */ + +#else /* GLib < 2.67.0 */ + +/* + * ...meanwhile GCC >= 11 has started issuing warnings about volatile + * from the old G_DEFINE_TYPE macro impl. IOW the new macros impls fixed + * new GCC, but broke CLang + */ +# if !defined(__clang__) && __GNUC_PREREQ (11, 0) +# undef _G_DEFINE_TYPE_EXTENDED_BEGIN + +# define _G_DEFINE_TYPE_EXTENDED_BEGIN(TypeName, type_name, TYPE_PARENT, flags) \ + _Pragma("GCC diagnostic push") \ + _Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"") \ + _G_DEFINE_TYPE_EXTENDED_BEGIN_PRE(TypeName, type_name, TYPE_PARENT) \ + _G_DEFINE_TYPE_EXTENDED_BEGIN_REGISTER(TypeName, type_name, TYPE_PARENT, flags) \ + _Pragma("GCC diagnostic pop") +# endif /* !clang */ + +#endif /* GLib < 2.67.0 */ gchar * vir_g_canonicalize_filename(const gchar *filename, const gchar *relative_to); -- 2.25.4