1 /* 2 * GLIB Compatibility Functions 3 * 4 * Copyright IBM, Corp. 2013 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * Michael Tokarev <mjt@tls.msk.ru> 9 * Paolo Bonzini <pbonzini@redhat.com> 10 * 11 * This work is licensed under the terms of the GNU GPL, version 2 or later. 12 * See the COPYING file in the top-level directory. 13 * 14 */ 15 16 #ifndef QEMU_GLIB_COMPAT_H 17 #define QEMU_GLIB_COMPAT_H 18 19 /* Ask for warnings for anything that was marked deprecated in 20 * the defined version, or before. It is a candidate for rewrite. 21 */ 22 #define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_48 23 24 /* Ask for warnings if code tries to use function that did not 25 * exist in the defined version. These risk breaking builds 26 */ 27 #define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_48 28 29 #pragma GCC diagnostic push 30 #pragma GCC diagnostic ignored "-Wdeprecated-declarations" 31 32 #include <glib.h> 33 34 /* 35 * Note that because of the GLIB_VERSION_MAX_ALLOWED constant above, allowing 36 * use of functions from newer GLib via this compat header needs a little 37 * trickery to prevent warnings being emitted. 38 * 39 * Consider a function from newer glib-X.Y that we want to use 40 * 41 * int g_foo(const char *wibble) 42 * 43 * We must define a static inline function with the same signature that does 44 * what we need, but with a "_qemu" suffix e.g. 45 * 46 * static inline void g_foo_qemu(const char *wibble) 47 * { 48 * #if GLIB_CHECK_VERSION(X, Y, 0) 49 * g_foo(wibble) 50 * #else 51 * g_something_equivalent_in_older_glib(wibble); 52 * #endif 53 * } 54 * 55 * The #pragma at the top of this file turns off -Wdeprecated-declarations, 56 * ensuring this wrapper function impl doesn't trigger the compiler warning 57 * about using too new glib APIs. Finally we can do 58 * 59 * #define g_foo(a) g_foo_qemu(a) 60 * 61 * So now the code elsewhere in QEMU, which *does* have the 62 * -Wdeprecated-declarations warning active, can call g_foo(...) as normal, 63 * without generating warnings. 64 */ 65 66 #if defined(_WIN32) && !GLIB_CHECK_VERSION(2, 50, 0) 67 /* 68 * g_poll has a problem on Windows when using 69 * timeouts < 10ms, so use wrapper. 70 */ 71 #define g_poll(fds, nfds, timeout) g_poll_fixed(fds, nfds, timeout) 72 gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout); 73 #endif 74 75 #pragma GCC diagnostic pop 76 77 #endif 78