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b4c6036faa
The glib version was not previously constrained by RHEL-7 since it
rebases fairly often. Instead SLES 12 and Ubuntu 16.04 were the
constraints in 00f2cfbbec. Both of
these are old enough that they are outside our platform support
matrix now.
Per repology, current shipping versions are:
RHEL-8: 2.56.4
Debian Buster: 2.58.3
openSUSE Leap 15.2: 2.62.6
Ubuntu LTS 18.04: 2.56.4
Ubuntu LTS 20.04: 2.64.6
FreeBSD: 2.66.7
Fedora 33: 2.66.8
Fedora 34: 2.68.1
OpenBSD: 2.68.1
macOS HomeBrew: 2.68.1
Thus Ubuntu LTS 18.04 / RHEL-8 are the constraint for GLib version
at 2.56
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20210514120415.1368922-11-berrange@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
114 lines
3.1 KiB
C
114 lines
3.1 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_56
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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_56
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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 "_qemu" suffix e.g.
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*
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* static inline void g_foo_qemu(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_qemu(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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#if defined(G_OS_UNIX)
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/*
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* Note: The fallback implementation is not MT-safe, and it returns a copy of
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* the libc passwd (must be g_free() after use) but not the content. Because of
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* these important differences the caller must be aware of, it's not #define for
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* GLib API substitution.
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*/
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static inline struct passwd *
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g_unix_get_passwd_entry_qemu(const gchar *user_name, GError **error)
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{
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#if GLIB_CHECK_VERSION(2, 64, 0)
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return g_unix_get_passwd_entry(user_name, error);
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#else
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struct passwd *p = getpwnam(user_name);
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if (!p) {
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g_set_error_literal(error, G_UNIX_ERROR, 0, g_strerror(errno));
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return NULL;
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}
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return (struct passwd *)g_memdup(p, sizeof(*p));
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#endif
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}
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#endif /* G_OS_UNIX */
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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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#endif
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