0d8caac904
Now that we dropped support for CentOS 8 and Ubuntu 20.04, we can look into bumping the glib version to a new minimum for further clean-ups. According to repology.org, available versions are: CentOS Stream 9: 2.66.7 Debian 11: 2.66.8 Fedora 38: 2.74.1 Freebsd: 2.78.4 Homebrew: 2.80.0 Openbsd: 2.78.4 OpenSuse leap 15.5: 2.70.5 pkgsrc_current: 2.78.4 Ubuntu 22.04: 2.72.1 Thus it should be safe to bump the minimum glib version to 2.66 now. Version 2.66 comes with new functions for URI parsing which will allow further clean-ups in the following patches. Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Message-ID: <20240418101056.302103-8-thuth@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/*
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* GLIB Compatibility Functions
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*
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* Copyright IBM, Corp. 2013
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Michael Tokarev <mjt@tls.msk.ru>
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* Paolo Bonzini <pbonzini@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_GLIB_COMPAT_H
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#define QEMU_GLIB_COMPAT_H
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/* Ask for warnings for anything that was marked deprecated in
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* the defined version, or before. It is a candidate for rewrite.
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*/
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#define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_66
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/* Ask for warnings if code tries to use function that did not
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* exist in the defined version. These risk breaking builds
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*/
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#define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_66
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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#include <glib.h>
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#if defined(G_OS_UNIX)
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#include <glib-unix.h>
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#include <sys/types.h>
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#include <pwd.h>
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#endif
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/*
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* Note that because of the GLIB_VERSION_MAX_ALLOWED constant above, allowing
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* use of functions from newer GLib via this compat header needs a little
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* trickery to prevent warnings being emitted.
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*
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* Consider a function from newer glib-X.Y that we want to use
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*
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* int g_foo(const char *wibble)
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*
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* We must define a static inline function with the same signature that does
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* what we need, but with a "_compat" suffix e.g.
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*
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* static inline void g_foo_compat(const char *wibble)
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* {
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* #if GLIB_CHECK_VERSION(X, Y, 0)
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* g_foo(wibble)
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* #else
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* g_something_equivalent_in_older_glib(wibble);
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* #endif
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* }
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*
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* The #pragma at the top of this file turns off -Wdeprecated-declarations,
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* ensuring this wrapper function impl doesn't trigger the compiler warning
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* about using too new glib APIs. Finally we can do
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*
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* #define g_foo(a) g_foo_compat(a)
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*
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* So now the code elsewhere in QEMU, which *does* have the
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* -Wdeprecated-declarations warning active, can call g_foo(...) as normal,
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* without generating warnings.
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*/
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/*
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* g_memdup2_qemu:
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* @mem: (nullable): the memory to copy.
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* @byte_size: the number of bytes to copy.
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*
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* Allocates @byte_size bytes of memory, and copies @byte_size bytes into it
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* from @mem. If @mem is %NULL it returns %NULL.
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*
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* This replaces g_memdup(), which was prone to integer overflows when
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* converting the argument from a #gsize to a #guint.
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*
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* This static inline version is a backport of the new public API from
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* GLib 2.68, kept internal to GLib for backport to older stable releases.
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* See https://gitlab.gnome.org/GNOME/glib/-/issues/2319.
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*
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* Returns: (nullable): a pointer to the newly-allocated copy of the memory,
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* or %NULL if @mem is %NULL.
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*/
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static inline gpointer g_memdup2_qemu(gconstpointer mem, gsize byte_size)
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{
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#if GLIB_CHECK_VERSION(2, 68, 0)
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return g_memdup2(mem, byte_size);
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#else
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gpointer new_mem;
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if (mem && byte_size != 0) {
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new_mem = g_malloc(byte_size);
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memcpy(new_mem, mem, byte_size);
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} else {
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new_mem = NULL;
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}
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return new_mem;
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#endif
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}
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#define g_memdup2(m, s) g_memdup2_qemu(m, s)
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static inline bool
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qemu_g_test_slow(void)
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{
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static int cached = -1;
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if (cached == -1) {
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cached = g_test_slow() || getenv("G_TEST_SLOW") != NULL;
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}
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return cached;
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}
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#undef g_test_slow
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#undef g_test_thorough
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#undef g_test_quick
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#define g_test_slow() qemu_g_test_slow()
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#define g_test_thorough() qemu_g_test_slow()
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#define g_test_quick() (!qemu_g_test_slow())
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#pragma GCC diagnostic pop
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#ifndef G_NORETURN
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#define G_NORETURN G_GNUC_NORETURN
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#endif
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#endif
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