mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-24 12:09:58 +00:00
e71e8cc035
There are two useful macros that can be defined before including glib.h that are related to the min required glib version - GLIB_VERSION_MIN_REQUIRED When this is defined, if code uses an API that was deprecated in this version, or older, a compiler warning will be emitted. This alerts maintainers to update their code to whatever new replacement API is now recommended best practice. - GLIB_VERSION_MAX_ALLOWED When this is defined, if code uses an API that was introduced in a version that is newer than the declared version, a compiler warning will be emitted. This alerts maintainers if new code accidentally uses functionality that won't be available on some supported platforms. The GLIB_VERSION_MAX_ALLOWED constant makes it a bit harder to opt in to using specific new APIs with a GLIB_CHECK_VERSION conditional. To workaround this Pragmas can be used to temporarily turn off the -Wdeprecated-declarations compiler warning, while a static inline compat function is implemented. This workaround is illustrated with the implementation of the g_strv_contains method to satisfy the test suite. Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/*
|
|
* GLIB Compatibility Functions
|
|
*
|
|
* Copyright IBM, Corp. 2013
|
|
*
|
|
* Authors:
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
* Michael Tokarev <mjt@tls.msk.ru>
|
|
* Paolo Bonzini <pbonzini@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#ifndef QEMU_GLIB_COMPAT_H
|
|
#define QEMU_GLIB_COMPAT_H
|
|
|
|
/* Ask for warnings for anything that was marked deprecated in
|
|
* the defined version, or before. It is a candidate for rewrite.
|
|
*/
|
|
#define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_40
|
|
|
|
/* Ask for warnings if code tries to use function that did not
|
|
* exist in the defined version. These risk breaking builds
|
|
*/
|
|
#define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_40
|
|
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
|
|
|
|
#include <glib.h>
|
|
|
|
/*
|
|
* Note that because of the GLIB_VERSION_MAX_ALLOWED constant above, allowing
|
|
* use of functions from newer GLib via this compat header needs a little
|
|
* trickery to prevent warnings being emitted.
|
|
*
|
|
* Consider a function from newer glib-X.Y that we want to use
|
|
*
|
|
* int g_foo(const char *wibble)
|
|
*
|
|
* We must define a static inline function with the same signature that does
|
|
* what we need, but with a "_qemu" suffix e.g.
|
|
*
|
|
* static inline void g_foo_qemu(const char *wibble)
|
|
* {
|
|
* #if GLIB_CHECK_VERSION(X, Y, 0)
|
|
* g_foo(wibble)
|
|
* #else
|
|
* g_something_equivalent_in_older_glib(wibble);
|
|
* #endif
|
|
* }
|
|
*
|
|
* The #pragma at the top of this file turns off -Wdeprecated-declarations,
|
|
* ensuring this wrapper function impl doesn't trigger the compiler warning
|
|
* about using too new glib APIs. Finally we can do
|
|
*
|
|
* #define g_foo(a) g_foo_qemu(a)
|
|
*
|
|
* So now the code elsewhere in QEMU, which *does* have the
|
|
* -Wdeprecated-declarations warning active, can call g_foo(...) as normal,
|
|
* without generating warnings.
|
|
*/
|
|
|
|
static inline gboolean g_strv_contains_qemu(const gchar *const *strv,
|
|
const gchar *str)
|
|
{
|
|
#if GLIB_CHECK_VERSION(2, 44, 0)
|
|
return g_strv_contains(strv, str);
|
|
#else
|
|
g_return_val_if_fail(strv != NULL, FALSE);
|
|
g_return_val_if_fail(str != NULL, FALSE);
|
|
|
|
for (; *strv != NULL; strv++) {
|
|
if (g_str_equal(str, *strv)) {
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
return FALSE;
|
|
#endif
|
|
}
|
|
#define g_strv_contains(a, b) g_strv_contains_qemu(a, b)
|
|
|
|
|
|
#if defined(_WIN32) && !GLIB_CHECK_VERSION(2, 50, 0)
|
|
/*
|
|
* g_poll has a problem on Windows when using
|
|
* timeouts < 10ms, so use wrapper.
|
|
*/
|
|
#define g_poll(fds, nfds, timeout) g_poll_fixed(fds, nfds, timeout)
|
|
gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout);
|
|
#endif
|
|
|
|
|
|
#ifndef g_assert_cmpmem
|
|
#define g_assert_cmpmem(m1, l1, m2, l2) \
|
|
do { \
|
|
gconstpointer __m1 = m1, __m2 = m2; \
|
|
int __l1 = l1, __l2 = l2; \
|
|
if (__l1 != __l2) { \
|
|
g_assertion_message_cmpnum( \
|
|
G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
|
|
#l1 " (len(" #m1 ")) == " #l2 " (len(" #m2 "))", __l1, "==", \
|
|
__l2, 'i'); \
|
|
} else if (memcmp(__m1, __m2, __l1) != 0) { \
|
|
g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
|
|
"assertion failed (" #m1 " == " #m2 ")"); \
|
|
} \
|
|
} while (0)
|
|
#endif
|
|
|
|
#pragma GCC diagnostic pop
|
|
|
|
#endif
|