libvirt/src/util/glibcompat.h

/*
 * Copyright (C) 2019 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <glib.h>
#include <glib/gstdio.h>
#include <glib-object.h>

#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
 *
 * For that we need to disable the one check that produces an error in our
 * builds when using any G_DEFINE_TYPE* macro.  Thankfully all those macros end
 * up using _G_DEFINE_TYPE_EXTENDED_BEGIN.  Because with that we can redefine
 * this one macro to cover all use cases.  The macro is defined the same way it
 * is defined in glib (with a very low probability of being changed thanks to a
 * comment above it).
 */
#  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-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__ */

#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 && GCC >= 11.0 */

#endif /* GLib < 2.67.0 */

gchar * vir_g_canonicalize_filename(const gchar *filename,
                                    const gchar *relative_to);
gint vir_g_fsync(gint fd);
char *vir_g_strdup_printf(const char *msg, ...)
    G_GNUC_PRINTF(1, 2);
char *vir_g_strdup_vprintf(const char *msg, va_list args)
    G_GNUC_PRINTF(1, 0);

#if !GLIB_CHECK_VERSION(2, 64, 0)
# define g_strdup_printf vir_g_strdup_printf
# define g_strdup_vprintf vir_g_strdup_vprintf
#endif

#define g_canonicalize_filename vir_g_canonicalize_filename
#undef g_fsync
#define g_fsync vir_g_fsync

void vir_g_source_unref(GSource *src, GMainContext *ctx);