Replace GCC_FMT_ATTR with G_GNUC_PRINTF

One less qemu-specific macro. It also helps to make some headers/units
only depend on glib, and thus moved in standalone projects eventually.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>

audio/alsaaudio.c

@@ -72,7 +72,7 @@ struct alsa_params_obt {
     snd_pcm_uframes_t samples;
 };
 
-static void GCC_FMT_ATTR (2, 3) alsa_logerr (int err, const char *fmt, ...)
+static void G_GNUC_PRINTF (2, 3) alsa_logerr (int err, const char *fmt, ...)
 {
     va_list ap;
 
@@ -83,7 +83,7 @@ static void GCC_FMT_ATTR (2, 3) alsa_logerr (int err, const char *fmt, ...)
     AUD_log (AUDIO_CAP, "Reason: %s\n", snd_strerror (err));
 }
 
-static void GCC_FMT_ATTR (3, 4) alsa_logerr2 (
+static void G_GNUC_PRINTF (3, 4) alsa_logerr2 (
     int err,
     const char *typ,
     const char *fmt,

audio/audio.h

@@ -91,8 +91,8 @@ typedef struct QEMUAudioTimeStamp {
     uint64_t old_ts;
 } QEMUAudioTimeStamp;
 
-void AUD_vlog (const char *cap, const char *fmt, va_list ap) GCC_FMT_ATTR(2, 0);
-void AUD_log (const char *cap, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
+void AUD_vlog (const char *cap, const char *fmt, va_list ap) G_GNUC_PRINTF(2, 0);
+void AUD_log (const char *cap, const char *fmt, ...) G_GNUC_PRINTF(2, 3);
 
 void AUD_register_card (const char *name, QEMUSoundCard *card);
 void AUD_remove_card (QEMUSoundCard *card);

audio/coreaudio.m

@@ -211,7 +211,7 @@ static void coreaudio_logstatus (OSStatus status)
     AUD_log (AUDIO_CAP, "Reason: %s\n", str);
 }
 
-static void GCC_FMT_ATTR (2, 3) coreaudio_logerr (
+static void G_GNUC_PRINTF (2, 3) coreaudio_logerr (
     OSStatus status,
     const char *fmt,
     ...
@@ -226,7 +226,7 @@ static void GCC_FMT_ATTR (2, 3) coreaudio_logerr (
     coreaudio_logstatus (status);
 }
 
-static void GCC_FMT_ATTR (3, 4) coreaudio_logerr2 (
+static void G_GNUC_PRINTF (3, 4) coreaudio_logerr2 (
     OSStatus status,
     const char *typ,
     const char *fmt,

audio/dsoundaudio.c

@@ -222,7 +222,7 @@ static void dsound_log_hresult (HRESULT hr)
     AUD_log (AUDIO_CAP, "Reason: %s\n", str);
 }
 
-static void GCC_FMT_ATTR (2, 3) dsound_logerr (
+static void G_GNUC_PRINTF (2, 3) dsound_logerr (
     HRESULT hr,
     const char *fmt,
     ...
@@ -237,7 +237,7 @@ static void GCC_FMT_ATTR (2, 3) dsound_logerr (
     dsound_log_hresult (hr);
 }
 
-static void GCC_FMT_ATTR (3, 4) dsound_logerr2 (
+static void G_GNUC_PRINTF (3, 4) dsound_logerr2 (
     HRESULT hr,
     const char *typ,
     const char *fmt,

audio/ossaudio.c

@@ -63,7 +63,7 @@ struct oss_params {
     int fragsize;
 };
 
-static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
+static void G_GNUC_PRINTF (2, 3) oss_logerr (int err, const char *fmt, ...)
 {
     va_list ap;
 
@@ -74,7 +74,7 @@ static void GCC_FMT_ATTR (2, 3) oss_logerr (int err, const char *fmt, ...)
     AUD_log (AUDIO_CAP, "Reason: %s\n", strerror (err));
 }
 
-static void GCC_FMT_ATTR (3, 4) oss_logerr2 (
+static void G_GNUC_PRINTF (3, 4) oss_logerr2 (
     int err,
     const char *typ,
     const char *fmt,

audio/paaudio.c

@@ -43,7 +43,7 @@ typedef struct {
 
 static void qpa_conn_fini(PAConnection *c);
 
-static void GCC_FMT_ATTR (2, 3) qpa_logerr (int err, const char *fmt, ...)
+static void G_GNUC_PRINTF (2, 3) qpa_logerr (int err, const char *fmt, ...)
 {
     va_list ap;
 

audio/sdlaudio.c

@@ -55,7 +55,7 @@ typedef struct SDLVoiceIn {
     SDL_AudioDeviceID devid;
 } SDLVoiceIn;
 
-static void GCC_FMT_ATTR (1, 2) sdl_logerr (const char *fmt, ...)
+static void G_GNUC_PRINTF (1, 2) sdl_logerr (const char *fmt, ...)
 {
     va_list ap;
 

block/blkverify.c

@@ -44,7 +44,7 @@ typedef struct BlkverifyRequest {
     QEMUIOVector *raw_qiov;     /* cloned I/O vector for raw file */
 } BlkverifyRequest;
 
-static void GCC_FMT_ATTR(2, 3) blkverify_err(BlkverifyRequest *r,
+static void G_GNUC_PRINTF(2, 3) blkverify_err(BlkverifyRequest *r,
                                              const char *fmt, ...)
 {
     va_list ap;

block/qcow2.h

@@ -838,7 +838,7 @@ int qcow2_update_header(BlockDriverState *bs);
 
 void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset,
                              int64_t size, const char *message_format, ...)
-                             GCC_FMT_ATTR(5, 6);
+                             G_GNUC_PRINTF(5, 6);
 
 int qcow2_validate_table(BlockDriverState *bs, uint64_t offset,
                          uint64_t entries, size_t entry_len,

block/ssh.c

@@ -108,7 +108,7 @@ static void ssh_state_free(BDRVSSHState *s)
     }
 }
 
-static void GCC_FMT_ATTR(3, 4)
+static void G_GNUC_PRINTF(3, 4)
 session_error_setg(Error **errp, BDRVSSHState *s, const char *fs, ...)
 {
     va_list args;
@@ -133,7 +133,7 @@ session_error_setg(Error **errp, BDRVSSHState *s, const char *fs, ...)
     g_free(msg);
 }
 
-static void GCC_FMT_ATTR(3, 4)
+static void G_GNUC_PRINTF(3, 4)
 sftp_error_setg(Error **errp, BDRVSSHState *s, const char *fs, ...)
 {
     va_list args;

bsd-user/qemu.h

@@ -175,7 +175,7 @@ abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
 abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
                             abi_long arg2, abi_long arg3, abi_long arg4,
                             abi_long arg5, abi_long arg6);
-void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
+void gemu_log(const char *fmt, ...) G_GNUC_PRINTF(1, 2);
 extern __thread CPUState *thread_cpu;
 void cpu_loop(CPUArchState *env);
 char *target_strerror(int err);

fsdev/9p-marshal.c

@@ -27,7 +27,7 @@ void v9fs_string_free(V9fsString *str)
     str->size = 0;
 }
 
-void GCC_FMT_ATTR(2, 3)
+void G_GNUC_PRINTF(2, 3)
 v9fs_string_sprintf(V9fsString *str, const char *fmt, ...)
 {
     va_list ap;

fsdev/virtfs-proxy-helper.c

@@ -57,7 +57,7 @@ static bool is_daemon;
 static bool get_version; /* IOC getversion IOCTL supported */
 static char *prog_name;
 
-static void GCC_FMT_ATTR(2, 3) do_log(int loglevel, const char *format, ...)
+static void G_GNUC_PRINTF(2, 3) do_log(int loglevel, const char *format, ...)
 {
     va_list ap;
 

hw/9pfs/9p.c

@@ -203,7 +203,7 @@ void v9fs_path_free(V9fsPath *path)
 }
 
 
-void GCC_FMT_ATTR(2, 3)
+void G_GNUC_PRINTF(2, 3)
 v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...)
 {
     va_list ap;

hw/acpi/aml-build.c

@@ -207,7 +207,7 @@ build_append_nameseg(GArray *array, const char *seg)
     g_array_append_vals(array, "____", ACPI_NAMESEG_LEN - len);
 }
 
-static void GCC_FMT_ATTR(2, 0)
+static void G_GNUC_PRINTF(2, 0)
 build_append_namestringv(GArray *array, const char *format, va_list ap)
 {
     char *s;
@@ -270,7 +270,7 @@ build_append_namestringv(GArray *array, const char *format, va_list ap)
     g_strfreev(segs);
 }
 
-GCC_FMT_ATTR(2, 3)
+G_GNUC_PRINTF(2, 3)
 static void build_append_namestring(GArray *array, const char *format, ...)
 {
     va_list ap;

hw/display/qxl.h

@@ -149,7 +149,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(PCIQXLDevice, PCI_QXL)
 /* qxl.c */
 void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL phys, int group_id);
 void qxl_set_guest_bug(PCIQXLDevice *qxl, const char *msg, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 void qxl_spice_update_area(PCIQXLDevice *qxl, uint32_t surface_id,
                            struct QXLRect *area, struct QXLRect *dirty_rects,

hw/mips/fuloong2e.c

@@ -72,7 +72,7 @@ static struct _loaderparams {
     const char *initrd_filename;
 } loaderparams;
 
-static void GCC_FMT_ATTR(3, 4) prom_set(uint32_t *prom_buf, int index,
+static void G_GNUC_PRINTF(3, 4) prom_set(uint32_t *prom_buf, int index,
                                         const char *string, ...)
 {
     va_list ap;

hw/mips/malta.c

@@ -995,7 +995,7 @@ static void write_bootloader(uint8_t *base, uint64_t run_addr,
 
 }
 
-static void GCC_FMT_ATTR(3, 4) prom_set(uint32_t *prom_buf, int index,
+static void G_GNUC_PRINTF(3, 4) prom_set(uint32_t *prom_buf, int index,
                                         const char *string, ...)
 {
     va_list ap;

hw/net/rocker/rocker.h

@@ -30,7 +30,7 @@
         fprintf(stderr, "%s ROCKER: " fmt, nowstr, ## __VA_ARGS__);\
     } while (0)
 #else
-static inline GCC_FMT_ATTR(1, 2) int DPRINTF(const char *fmt, ...)
+static inline G_GNUC_PRINTF(1, 2) int DPRINTF(const char *fmt, ...)
 {
     return 0;
 }

hw/net/rtl8139.c

@@ -86,7 +86,7 @@
 #  define DPRINTF(fmt, ...) \
     do { fprintf(stderr, "RTL8139: " fmt, ## __VA_ARGS__); } while (0)
 #else
-static inline GCC_FMT_ATTR(1, 2) int DPRINTF(const char *fmt, ...)
+static inline G_GNUC_PRINTF(1, 2) int DPRINTF(const char *fmt, ...)
 {
     return 0;
 }

hw/virtio/virtio.c

@@ -3579,7 +3579,7 @@ void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name)
     vdev->bus_name = g_strdup(bus_name);
 }
 
-void GCC_FMT_ATTR(2, 3) virtio_error(VirtIODevice *vdev, const char *fmt, ...)
+void G_GNUC_PRINTF(2, 3) virtio_error(VirtIODevice *vdev, const char *fmt, ...)
 {
     va_list ap;
 

hw/xen/xen_pt.h

@@ -9,7 +9,7 @@
 bool xen_igd_gfx_pt_enabled(void);
 void xen_igd_gfx_pt_set(bool value, Error **errp);
 
-void xen_pt_log(const PCIDevice *d, const char *f, ...) GCC_FMT_ATTR(2, 3);
+void xen_pt_log(const PCIDevice *d, const char *f, ...) G_GNUC_PRINTF(2, 3);
 
 #define XEN_PT_ERR(d, _f, _a...) xen_pt_log(d, "%s: Error: "_f, __func__, ##_a)
 

include/chardev/char-fe.h

@@ -172,7 +172,7 @@ void qemu_chr_fe_set_open(CharBackend *be, int fe_open);
  * Chardev.
  */
 void qemu_chr_fe_printf(CharBackend *be, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 
 typedef gboolean (*FEWatchFunc)(void *do_not_use, GIOCondition condition, void *data);

include/disas/dis-asm.h

@@ -269,7 +269,7 @@ typedef struct symbol_cache_entry
 } asymbol;
 
 typedef int (*fprintf_function)(FILE *f, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 enum dis_insn_type {
   dis_noninsn,			/* Not a valid instruction */

include/hw/acpi/aml-build.h

@@ -289,7 +289,7 @@ void free_aml_allocator(void);
 void aml_append(Aml *parent_ctx, Aml *child);
 
 /* non block AML object primitives */
-Aml *aml_name(const char *name_format, ...) GCC_FMT_ATTR(1, 2);
+Aml *aml_name(const char *name_format, ...) G_GNUC_PRINTF(1, 2);
 Aml *aml_name_decl(const char *name, Aml *val);
 Aml *aml_debug(void);
 Aml *aml_return(Aml *val);
@@ -344,13 +344,13 @@ Aml *aml_irq_no_flags(uint8_t irq);
 Aml *aml_named_field(const char *name, unsigned length);
 Aml *aml_reserved_field(unsigned length);
 Aml *aml_local(int num);
-Aml *aml_string(const char *name_format, ...) GCC_FMT_ATTR(1, 2);
+Aml *aml_string(const char *name_format, ...) G_GNUC_PRINTF(1, 2);
 Aml *aml_lnot(Aml *arg);
 Aml *aml_equal(Aml *arg1, Aml *arg2);
 Aml *aml_lgreater(Aml *arg1, Aml *arg2);
 Aml *aml_lgreater_equal(Aml *arg1, Aml *arg2);
 Aml *aml_processor(uint8_t proc_id, uint32_t pblk_addr, uint8_t pblk_len,
-                   const char *name_format, ...) GCC_FMT_ATTR(4, 5);
+                   const char *name_format, ...) G_GNUC_PRINTF(4, 5);
 Aml *aml_eisaid(const char *str);
 Aml *aml_word_bus_number(AmlMinFixed min_fixed, AmlMaxFixed max_fixed,
                          AmlDecode dec, uint16_t addr_gran,
@@ -384,8 +384,8 @@ Aml *aml_sleep(uint64_t msec);
 Aml *aml_i2c_serial_bus_device(uint16_t address, const char *resource_source);
 
 /* Block AML object primitives */
-Aml *aml_scope(const char *name_format, ...) GCC_FMT_ATTR(1, 2);
-Aml *aml_device(const char *name_format, ...) GCC_FMT_ATTR(1, 2);
+Aml *aml_scope(const char *name_format, ...) G_GNUC_PRINTF(1, 2);
+Aml *aml_device(const char *name_format, ...) G_GNUC_PRINTF(1, 2);
 Aml *aml_method(const char *name, int arg_count, AmlSerializeFlag sflag);
 Aml *aml_if(Aml *predicate);
 Aml *aml_else(void);
@@ -460,7 +460,7 @@ build_xsdt(GArray *table_data, BIOSLinker *linker, GArray *table_offsets,
 
 int
 build_append_named_dword(GArray *array, const char *name_format, ...)
-GCC_FMT_ATTR(2, 3);
+G_GNUC_PRINTF(2, 3);
 
 void build_append_gas(GArray *table, AmlAddressSpace as,
                       uint8_t bit_width, uint8_t bit_offset,

include/hw/core/cpu.h

@@ -1016,7 +1016,7 @@ int cpu_watchpoint_address_matches(CPUState *cpu, vaddr addr, vaddr len);
 AddressSpace *cpu_get_address_space(CPUState *cpu, int asidx);
 
 void QEMU_NORETURN cpu_abort(CPUState *cpu, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 /* $(top_srcdir)/cpu.c */
 void cpu_class_init_props(DeviceClass *dc);

include/hw/hw.h

@@ -5,6 +5,6 @@
 #error Cannot include hw/hw.h from user emulation
 #endif
 
-void QEMU_NORETURN hw_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
+void QEMU_NORETURN hw_error(const char *fmt, ...) G_GNUC_PRINTF(1, 2);
 
 #endif

include/hw/virtio/virtio.h

@@ -169,7 +169,7 @@ void virtio_init(VirtIODevice *vdev, const char *name,
                          uint16_t device_id, size_t config_size);
 void virtio_cleanup(VirtIODevice *vdev);
 
-void virtio_error(VirtIODevice *vdev, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
+void virtio_error(VirtIODevice *vdev, const char *fmt, ...) G_GNUC_PRINTF(2, 3);
 
 /* Set the child bus name. */
 void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name);

include/hw/xen/xen-bus-helper.h

@@ -22,11 +22,11 @@ void xs_node_destroy(struct xs_handle *xsh,  xs_transaction_t tid,
 void xs_node_vprintf(struct xs_handle *xsh,  xs_transaction_t tid,
                      const char *node, const char *key, Error **errp,
                      const char *fmt, va_list ap)
-    GCC_FMT_ATTR(6, 0);
+    G_GNUC_PRINTF(6, 0);
 void xs_node_printf(struct xs_handle *xsh,  xs_transaction_t tid,
                     const char *node, const char *key, Error **errp,
                     const char *fmt, ...)
-    GCC_FMT_ATTR(6, 7);
+    G_GNUC_PRINTF(6, 7);
 
 /* Read from node/key unless node is empty, in which case read from key */
 int xs_node_vscanf(struct xs_handle *xsh,  xs_transaction_t tid,

include/hw/xen/xen-bus.h

@@ -88,10 +88,10 @@ enum xenbus_state xen_device_backend_get_state(XenDevice *xendev);
 
 void xen_device_backend_printf(XenDevice *xendev, const char *key,
                                const char *fmt, ...)
-    GCC_FMT_ATTR(3, 4);
+    G_GNUC_PRINTF(3, 4);
 void xen_device_frontend_printf(XenDevice *xendev, const char *key,
                                 const char *fmt, ...)
-    GCC_FMT_ATTR(3, 4);
+    G_GNUC_PRINTF(3, 4);
 
 int xen_device_frontend_scanf(XenDevice *xendev, const char *key,
                               const char *fmt, ...);

include/hw/xen/xen_common.h

@@ -358,7 +358,7 @@ static inline int xen_restrict(domid_t domid)
 void destroy_hvm_domain(bool reboot);
 
 /* shutdown/destroy current domain because of an error */
-void xen_shutdown_fatal_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
+void xen_shutdown_fatal_error(const char *fmt, ...) G_GNUC_PRINTF(1, 2);
 
 #ifdef HVM_PARAM_VMPORT_REGS_PFN
 static inline int xen_get_vmport_regs_pfn(xc_interface *xc, domid_t dom,

include/hw/xen/xen_pvdev.h

@@ -76,6 +76,6 @@ void xen_pv_unbind_evtchn(struct XenLegacyDevice *xendev);
 int xen_pv_send_notify(struct XenLegacyDevice *xendev);
 
 void xen_pv_printf(struct XenLegacyDevice *xendev, int msg_level,
-                   const char *fmt, ...)  GCC_FMT_ATTR(3, 4);
+                   const char *fmt, ...)  G_GNUC_PRINTF(3, 4);
 
 #endif /* QEMU_HW_XEN_PVDEV_H */

include/monitor/monitor.h

@@ -32,8 +32,8 @@ int monitor_get_fd(Monitor *mon, const char *fdname, Error **errp);
 int monitor_fd_param(Monitor *mon, const char *fdname, Error **errp);
 
 int monitor_vprintf(Monitor *mon, const char *fmt, va_list ap)
-    GCC_FMT_ATTR(2, 0);
-int monitor_printf(Monitor *mon, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 0);
+int monitor_printf(Monitor *mon, const char *fmt, ...) G_GNUC_PRINTF(2, 3);
 void monitor_flush(Monitor *mon);
 int monitor_set_cpu(Monitor *mon, int cpu_index);
 int monitor_get_cpu_index(Monitor *mon);

include/qapi/error.h

@@ -320,7 +320,7 @@ ErrorClass error_get_class(const Error *err);
 void error_setg_internal(Error **errp,
                          const char *src, int line, const char *func,
                          const char *fmt, ...)
-    GCC_FMT_ATTR(5, 6);
+    G_GNUC_PRINTF(5, 6);
 
 /*
  * Just like error_setg(), with @os_error info added to the message.
@@ -336,7 +336,7 @@ void error_setg_internal(Error **errp,
 void error_setg_errno_internal(Error **errp,
                                const char *fname, int line, const char *func,
                                int os_error, const char *fmt, ...)
-    GCC_FMT_ATTR(6, 7);
+    G_GNUC_PRINTF(6, 7);
 
 #ifdef _WIN32
 /*
@@ -350,7 +350,7 @@ void error_setg_errno_internal(Error **errp,
 void error_setg_win32_internal(Error **errp,
                                const char *src, int line, const char *func,
                                int win32_err, const char *fmt, ...)
-    GCC_FMT_ATTR(6, 7);
+    G_GNUC_PRINTF(6, 7);
 #endif
 
 /*
@@ -383,21 +383,21 @@ void error_propagate(Error **dst_errp, Error *local_err);
  */
 void error_propagate_prepend(Error **dst_errp, Error *local_err,
                              const char *fmt, ...)
-    GCC_FMT_ATTR(3, 4);
+    G_GNUC_PRINTF(3, 4);
 
 /*
  * Prepend some text to @errp's human-readable error message.
  * The text is made by formatting @fmt, @ap like vprintf().
  */
 void error_vprepend(Error *const *errp, const char *fmt, va_list ap)
-    GCC_FMT_ATTR(2, 0);
+    G_GNUC_PRINTF(2, 0);
 
 /*
  * Prepend some text to @errp's human-readable error message.
  * The text is made by formatting @fmt, ... like printf().
  */
 void error_prepend(Error *const *errp, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 /*
  * Append a printf-style human-readable explanation to an existing error.
@@ -414,7 +414,7 @@ void error_prepend(Error *const *errp, const char *fmt, ...)
  * newline.
  */
 void error_append_hint(Error *const *errp, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 /*
  * Convenience function to report open() failure.
@@ -458,13 +458,13 @@ void error_report_err(Error *err);
  * Convenience function to error_prepend(), warn_report() and free @err.
  */
 void warn_reportf_err(Error *err, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 /*
  * Convenience function to error_prepend(), error_report() and free @err.
  */
 void error_reportf_err(Error *err, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 /*
  * Just like error_setg(), except you get to specify the error class.
@@ -477,7 +477,7 @@ void error_reportf_err(Error *err, const char *fmt, ...)
 void error_set_internal(Error **errp,
                         const char *src, int line, const char *func,
                         ErrorClass err_class, const char *fmt, ...)
-    GCC_FMT_ATTR(6, 7);
+    G_GNUC_PRINTF(6, 7);
 
 /*
  * Make @errp parameter easier to use regardless of argument value

include/qapi/qmp/qjson.h

@@ -17,13 +17,13 @@
 QObject *qobject_from_json(const char *string, Error **errp);
 
 QObject *qobject_from_vjsonf_nofail(const char *string, va_list ap)
-    GCC_FMT_ATTR(1, 0);
+    G_GNUC_PRINTF(1, 0);
 QObject *qobject_from_jsonf_nofail(const char *string, ...)
-    GCC_FMT_ATTR(1, 2);
+    G_GNUC_PRINTF(1, 2);
 QDict *qdict_from_vjsonf_nofail(const char *string, va_list ap)
-    GCC_FMT_ATTR(1, 0);
+    G_GNUC_PRINTF(1, 0);
 QDict *qdict_from_jsonf_nofail(const char *string, ...)
-    GCC_FMT_ATTR(1, 2);
+    G_GNUC_PRINTF(1, 2);
 
 GString *qobject_to_json(const QObject *obj);
 GString *qobject_to_json_pretty(const QObject *obj, bool pretty);

include/qemu/buffer.h

@@ -49,7 +49,7 @@ struct Buffer {
  * to identify in debug traces.
  */
 void buffer_init(Buffer *buffer, const char *name, ...)
-        GCC_FMT_ATTR(2, 3);
+        G_GNUC_PRINTF(2, 3);
 
 /**
  * buffer_shrink:

include/qemu/compiler.h

@@ -79,19 +79,12 @@
 #define QEMU_BUILD_BUG_ON_ZERO(x) (sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)) - \
                                    sizeof(QEMU_BUILD_BUG_ON_STRUCT(x)))
 
-#if defined(__clang__)
-/* clang doesn't support gnu_printf, so use printf. */
-# define GCC_FMT_ATTR(n, m) __attribute__((format(printf, n, m)))
-#else
-/* Use gnu_printf (qemu uses standard format strings). */
-# define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
-# if defined(_WIN32)
+#if !defined(__clang__) && defined(_WIN32)
 /*
  * Map __printf__ to __gnu_printf__ because we want standard format strings even
  * when MinGW or GLib include files use __printf__.
  */
-#  define __printf__ __gnu_printf__
-# endif
+# define __printf__ __gnu_printf__
 #endif
 
 #ifndef __has_warning

include/qemu/error-report.h

@@ -30,23 +30,23 @@ void loc_set_none(void);
 void loc_set_cmdline(char **argv, int idx, int cnt);
 void loc_set_file(const char *fname, int lno);
 
-int error_vprintf(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);
-int error_printf(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
-int error_vprintf_unless_qmp(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);
-int error_printf_unless_qmp(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
+int error_vprintf(const char *fmt, va_list ap) G_GNUC_PRINTF(1, 0);
+int error_printf(const char *fmt, ...) G_GNUC_PRINTF(1, 2);
+int error_vprintf_unless_qmp(const char *fmt, va_list ap) G_GNUC_PRINTF(1, 0);
+int error_printf_unless_qmp(const char *fmt, ...) G_GNUC_PRINTF(1, 2);
 
-void error_vreport(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);
-void warn_vreport(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);
-void info_vreport(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);
+void error_vreport(const char *fmt, va_list ap) G_GNUC_PRINTF(1, 0);
+void warn_vreport(const char *fmt, va_list ap) G_GNUC_PRINTF(1, 0);
+void info_vreport(const char *fmt, va_list ap) G_GNUC_PRINTF(1, 0);
 
-void error_report(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
-void warn_report(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
-void info_report(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
+void error_report(const char *fmt, ...) G_GNUC_PRINTF(1, 2);
+void warn_report(const char *fmt, ...) G_GNUC_PRINTF(1, 2);
+void info_report(const char *fmt, ...) G_GNUC_PRINTF(1, 2);
 
 bool error_report_once_cond(bool *printed, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 bool warn_report_once_cond(bool *printed, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 void error_init(const char *argv0);
 

include/qemu/log-for-trace.h

@@ -30,6 +30,6 @@ static inline bool qemu_loglevel_mask(int mask)
 }
 
 /* main logging function */
-int GCC_FMT_ATTR(1, 2) qemu_log(const char *fmt, ...);
+int G_GNUC_PRINTF(1, 2) qemu_log(const char *fmt, ...);
 
 #endif

include/qemu/log.h

@@ -96,7 +96,7 @@ static inline void qemu_log_unlock(FILE *fd)
 
 /* vfprintf-like logging function
  */
-static inline void GCC_FMT_ATTR(1, 0)
+static inline void G_GNUC_PRINTF(1, 0)
 qemu_log_vprintf(const char *fmt, va_list va)
 {
     QemuLogFile *logfile;

include/qemu/qemu-print.h

@@ -13,11 +13,11 @@
 #ifndef QEMU_PRINT_H
 #define QEMU_PRINT_H
 
-int qemu_vprintf(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);
-int qemu_printf(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
+int qemu_vprintf(const char *fmt, va_list ap) G_GNUC_PRINTF(1, 0);
+int qemu_printf(const char *fmt, ...) G_GNUC_PRINTF(1, 2);
 
 int qemu_vfprintf(FILE *stream, const char *fmt, va_list ap)
-    GCC_FMT_ATTR(2, 0);
-int qemu_fprintf(FILE *stream, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 0);
+int qemu_fprintf(FILE *stream, const char *fmt, ...) G_GNUC_PRINTF(2, 3);
 
 #endif

include/qemu/readline.h

@@ -5,7 +5,7 @@
 #define READLINE_MAX_CMDS 64
 #define READLINE_MAX_COMPLETIONS 256
 
-typedef void GCC_FMT_ATTR(2, 3) ReadLinePrintfFunc(void *opaque,
+typedef void G_GNUC_PRINTF(2, 3) ReadLinePrintfFunc(void *opaque,
                                                    const char *fmt, ...);
 typedef void ReadLineFlushFunc(void *opaque);
 typedef void ReadLineFunc(void *opaque, const char *str,

io/channel-websock.c

@@ -157,7 +157,7 @@ enum {
     QIO_CHANNEL_WEBSOCK_OPCODE_PONG = 0xA
 };
 
-static void GCC_FMT_ATTR(2, 3)
+static void G_GNUC_PRINTF(2, 3)
 qio_channel_websock_handshake_send_res(QIOChannelWebsock *ioc,
                                        const char *resmsg,
                                        ...)

monitor/hmp.c

@@ -308,7 +308,7 @@ void help_cmd(Monitor *mon, const char *name)
 static const char *pch;
 static sigjmp_buf expr_env;
 
-static void GCC_FMT_ATTR(2, 3) QEMU_NORETURN
+static void G_GNUC_PRINTF(2, 3) QEMU_NORETURN
 expr_error(Monitor *mon, const char *fmt, ...)
 {
     va_list ap;
@@ -1462,7 +1462,7 @@ static void monitor_event(void *opaque, QEMUChrEvent event)
  * These functions just adapt the readline interface in a typesafe way.  We
  * could cast function pointers but that discards compiler checks.
  */
-static void GCC_FMT_ATTR(2, 3) monitor_readline_printf(void *opaque,
+static void G_GNUC_PRINTF(2, 3) monitor_readline_printf(void *opaque,
                                                        const char *fmt, ...)
 {
     MonitorHMP *mon = opaque;

nbd/server.c

@@ -213,7 +213,7 @@ static int nbd_negotiate_send_rep(NBDClient *client, uint32_t type,
 
 /* Send an error reply.
  * Return -errno on error, 0 on success. */
-static int GCC_FMT_ATTR(4, 0)
+static int G_GNUC_PRINTF(4, 0)
 nbd_negotiate_send_rep_verr(NBDClient *client, uint32_t type,
                             Error **errp, const char *fmt, va_list va)
 {
@@ -253,7 +253,7 @@ nbd_sanitize_name(const char *name)
 
 /* Send an error reply.
  * Return -errno on error, 0 on success. */
-static int GCC_FMT_ATTR(4, 5)
+static int G_GNUC_PRINTF(4, 5)
 nbd_negotiate_send_rep_err(NBDClient *client, uint32_t type,
                            Error **errp, const char *fmt, ...)
 {
@@ -269,7 +269,7 @@ nbd_negotiate_send_rep_err(NBDClient *client, uint32_t type,
 /* Drop remainder of the current option, and send a reply with the
  * given error type and message. Return -errno on read or write
  * failure; or 0 if connection is still live. */
-static int GCC_FMT_ATTR(4, 0)
+static int G_GNUC_PRINTF(4, 0)
 nbd_opt_vdrop(NBDClient *client, uint32_t type, Error **errp,
               const char *fmt, va_list va)
 {
@@ -282,7 +282,7 @@ nbd_opt_vdrop(NBDClient *client, uint32_t type, Error **errp,
     return ret;
 }
 
-static int GCC_FMT_ATTR(4, 5)
+static int G_GNUC_PRINTF(4, 5)
 nbd_opt_drop(NBDClient *client, uint32_t type, Error **errp,
              const char *fmt, ...)
 {
@@ -296,7 +296,7 @@ nbd_opt_drop(NBDClient *client, uint32_t type, Error **errp,
     return ret;
 }
 
-static int GCC_FMT_ATTR(3, 4)
+static int G_GNUC_PRINTF(3, 4)
 nbd_opt_invalid(NBDClient *client, Error **errp, const char *fmt, ...)
 {
     int ret;

qemu-img.c

@@ -99,7 +99,7 @@ static void format_print(void *opaque, const char *name)
     printf(" %s", name);
 }
 
-static void QEMU_NORETURN GCC_FMT_ATTR(1, 2) error_exit(const char *fmt, ...)
+static void QEMU_NORETURN G_GNUC_PRINTF(1, 2) error_exit(const char *fmt, ...)
 {
     va_list ap;
 
@@ -284,7 +284,7 @@ static QemuOptsList qemu_source_opts = {
     },
 };
 
-static int GCC_FMT_ATTR(2, 3) qprintf(bool quiet, const char *fmt, ...)
+static int G_GNUC_PRINTF(2, 3) qprintf(bool quiet, const char *fmt, ...)
 {
     int ret = 0;
     if (!quiet) {

qemu-io.c

@@ -329,7 +329,7 @@ static char *get_prompt(void)
     return prompt;
 }
 
-static void GCC_FMT_ATTR(2, 3) readline_printf_func(void *opaque,
+static void G_GNUC_PRINTF(2, 3) readline_printf_func(void *opaque,
                                                     const char *fmt, ...)
 {
     va_list ap;

qga/guest-agent-core.h

@@ -36,7 +36,7 @@ void ga_command_state_free(GACommandState *cs);
 bool ga_logging_enabled(GAState *s);
 void ga_disable_logging(GAState *s);
 void ga_enable_logging(GAState *s);
-void GCC_FMT_ATTR(1, 2) slog(const gchar *fmt, ...);
+void G_GNUC_PRINTF(1, 2) slog(const gchar *fmt, ...);
 void ga_set_response_delimited(GAState *s);
 bool ga_is_frozen(GAState *s);
 void ga_set_frozen(GAState *s);

qga/vss-win32/requester.h

@@ -25,7 +25,7 @@ struct Error;
 typedef void (*ErrorSetFunc)(struct Error **errp,
                              const char *src, int line, const char *func,
                              int win32_err, const char *fmt, ...)
-    GCC_FMT_ATTR(6, 7);
+    G_GNUC_PRINTF(6, 7);
 typedef struct ErrorSet {
     ErrorSetFunc error_setg_win32_wrapper;
     struct Error **errp;        /* restriction: must not be null */

qobject/json-parser.c

@@ -54,7 +54,7 @@ static QObject *parse_value(JSONParserContext *ctxt);
 /**
  * Error handler
  */
-static void GCC_FMT_ATTR(3, 4) parse_error(JSONParserContext *ctxt,
+static void G_GNUC_PRINTF(3, 4) parse_error(JSONParserContext *ctxt,
                                            JSONToken *token, const char *msg, ...)
 {
     va_list ap;

scripts/checkpatch.pl

@@ -227,7 +227,7 @@ our $Attribute	= qr{
 			QEMU_WARN_UNUSED_RESULT|
 			QEMU_SENTINEL|
 			QEMU_PACKED|
-			GCC_FMT_ATTR
+			G_GNUC_PRINTF
 		  }x;
 our $Modifier;
 our $Inline	= qr{inline};

scripts/cocci-macro-file.h

@@ -34,7 +34,7 @@
 #define QEMU_BUILD_BUG_ON(x) \
     typedef char cat2(qemu_build_bug_on__,__LINE__)[(x)?-1:1] __attribute__((unused));
 
-#define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
+#define G_GNUC_PRINTF(n, m) __attribute__((format(gnu_printf, n, m)))
 
 #define xglue(x, y) x ## y
 #define glue(x, y) xglue(x, y)

softmmu/qtest.c

@@ -288,7 +288,7 @@ static void qtest_send_prefix(CharBackend *chr)
             (long) tv.tv_sec, (long) tv.tv_usec);
 }
 
-static void GCC_FMT_ATTR(1, 2) qtest_log_send(const char *fmt, ...)
+static void G_GNUC_PRINTF(1, 2) qtest_log_send(const char *fmt, ...)
 {
     va_list ap;
 
@@ -318,7 +318,7 @@ static void qtest_send(CharBackend *chr, const char *str)
     qtest_server_send(qtest_server_send_opaque, str);
 }
 
-static void GCC_FMT_ATTR(2, 3) qtest_sendf(CharBackend *chr,
+static void G_GNUC_PRINTF(2, 3) qtest_sendf(CharBackend *chr,
                                            const char *fmt, ...)
 {
     va_list ap;

tests/qtest/libqos/libqtest.h

@@ -31,7 +31,7 @@ typedef struct QTestState QTestState;
  *
  * Returns: #QTestState instance.
  */
-QTestState *qtest_initf(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
+QTestState *qtest_initf(const char *fmt, ...) G_GNUC_PRINTF(1, 2);
 
 /**
  * qtest_vinitf:
@@ -43,7 +43,7 @@ QTestState *qtest_initf(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
  *
  * Returns: #QTestState instance.
  */
-QTestState *qtest_vinitf(const char *fmt, va_list ap) GCC_FMT_ATTR(1, 0);
+QTestState *qtest_vinitf(const char *fmt, va_list ap) G_GNUC_PRINTF(1, 0);
 
 /**
  * qtest_init:
@@ -106,7 +106,7 @@ void qtest_quit(QTestState *s);
  */
 QDict *qtest_qmp_fds(QTestState *s, int *fds, size_t fds_num,
                      const char *fmt, ...)
-    GCC_FMT_ATTR(4, 5);
+    G_GNUC_PRINTF(4, 5);
 
 /**
  * qtest_qmp:
@@ -118,7 +118,7 @@ QDict *qtest_qmp_fds(QTestState *s, int *fds, size_t fds_num,
  * Sends a QMP message to QEMU and returns the response.
  */
 QDict *qtest_qmp(QTestState *s, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 /**
  * qtest_qmp_send:
@@ -130,7 +130,7 @@ QDict *qtest_qmp(QTestState *s, const char *fmt, ...)
  * Sends a QMP message to QEMU and leaves the response in the stream.
  */
 void qtest_qmp_send(QTestState *s, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 /**
  * qtest_qmp_send_raw:
@@ -141,7 +141,7 @@ void qtest_qmp_send(QTestState *s, const char *fmt, ...)
  * this is useful for negative tests.
  */
 void qtest_qmp_send_raw(QTestState *s, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 /**
  * qtest_socket_server:
@@ -165,7 +165,7 @@ int qtest_socket_server(const char *socket_path);
  */
 QDict *qtest_vqmp_fds(QTestState *s, int *fds, size_t fds_num,
                       const char *fmt, va_list ap)
-    GCC_FMT_ATTR(4, 0);
+    G_GNUC_PRINTF(4, 0);
 
 /**
  * qtest_vqmp:
@@ -178,7 +178,7 @@ QDict *qtest_vqmp_fds(QTestState *s, int *fds, size_t fds_num,
  * Sends a QMP message to QEMU and returns the response.
  */
 QDict *qtest_vqmp(QTestState *s, const char *fmt, va_list ap)
-    GCC_FMT_ATTR(2, 0);
+    G_GNUC_PRINTF(2, 0);
 
 /**
  * qtest_qmp_vsend_fds:
@@ -194,7 +194,7 @@ QDict *qtest_vqmp(QTestState *s, const char *fmt, va_list ap)
  */
 void qtest_qmp_vsend_fds(QTestState *s, int *fds, size_t fds_num,
                          const char *fmt, va_list ap)
-    GCC_FMT_ATTR(4, 0);
+    G_GNUC_PRINTF(4, 0);
 
 /**
  * qtest_qmp_vsend:
@@ -207,7 +207,7 @@ void qtest_qmp_vsend_fds(QTestState *s, int *fds, size_t fds_num,
  * Sends a QMP message to QEMU and leaves the response in the stream.
  */
 void qtest_qmp_vsend(QTestState *s, const char *fmt, va_list ap)
-    GCC_FMT_ATTR(2, 0);
+    G_GNUC_PRINTF(2, 0);
 
 /**
  * qtest_qmp_receive_dict:
@@ -269,7 +269,7 @@ QDict *qtest_qmp_event_ref(QTestState *s, const char *event);
  *
  * Returns: the command's output.  The caller should g_free() it.
  */
-char *qtest_hmp(QTestState *s, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
+char *qtest_hmp(QTestState *s, const char *fmt, ...) G_GNUC_PRINTF(2, 3);
 
 /**
  * qtest_hmpv:
@@ -283,7 +283,7 @@ char *qtest_hmp(QTestState *s, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
  * Returns: the command's output.  The caller should g_free() it.
  */
 char *qtest_vhmp(QTestState *s, const char *fmt, va_list ap)
-    GCC_FMT_ATTR(2, 0);
+    G_GNUC_PRINTF(2, 0);
 
 void qtest_module_load(QTestState *s, const char *prefix, const char *libname);
 
@@ -688,17 +688,17 @@ void qtest_remove_abrt_handler(void *data);
  * the response.
  */
 void qtest_qmp_assert_success(QTestState *qts, const char *fmt, ...)
-    GCC_FMT_ATTR(2, 3);
+    G_GNUC_PRINTF(2, 3);
 
 QDict *qmp_fd_receive(int fd);
 void qmp_fd_vsend_fds(int fd, int *fds, size_t fds_num,
-                      const char *fmt, va_list ap) GCC_FMT_ATTR(4, 0);
-void qmp_fd_vsend(int fd, const char *fmt, va_list ap) GCC_FMT_ATTR(2, 0);
-void qmp_fd_send(int fd, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
-void qmp_fd_send_raw(int fd, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
-void qmp_fd_vsend_raw(int fd, const char *fmt, va_list ap) GCC_FMT_ATTR(2, 0);
-QDict *qmp_fdv(int fd, const char *fmt, va_list ap) GCC_FMT_ATTR(2, 0);
-QDict *qmp_fd(int fd, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
+                      const char *fmt, va_list ap) G_GNUC_PRINTF(4, 0);
+void qmp_fd_vsend(int fd, const char *fmt, va_list ap) G_GNUC_PRINTF(2, 0);
+void qmp_fd_send(int fd, const char *fmt, ...) G_GNUC_PRINTF(2, 3);
+void qmp_fd_send_raw(int fd, const char *fmt, ...) G_GNUC_PRINTF(2, 3);
+void qmp_fd_vsend_raw(int fd, const char *fmt, va_list ap) G_GNUC_PRINTF(2, 0);
+QDict *qmp_fdv(int fd, const char *fmt, va_list ap) G_GNUC_PRINTF(2, 0);
+QDict *qmp_fd(int fd, const char *fmt, ...) G_GNUC_PRINTF(2, 3);
 
 /**
  * qtest_cb_for_every_machine:
@@ -750,7 +750,7 @@ void qtest_qmp_device_add_qdict(QTestState *qts, const char *drv,
  * Generic hot-plugging test via the device_add QMP command.
  */
 void qtest_qmp_device_add(QTestState *qts, const char *driver, const char *id,
-                          const char *fmt, ...) GCC_FMT_ATTR(4, 5);
+                          const char *fmt, ...) G_GNUC_PRINTF(4, 5);
 
 /**
  * qtest_qmp_add_client:

tests/qtest/libqtest-single.h

@@ -52,7 +52,7 @@ static inline void qtest_end(void)
  *
  * Sends a QMP message to QEMU and returns the response.
  */
-GCC_FMT_ATTR(1, 2)
+G_GNUC_PRINTF(1, 2)
 static inline QDict *qmp(const char *fmt, ...)
 {
     va_list ap;

tests/qtest/libqtest.c

@@ -437,7 +437,7 @@ static void qtest_client_socket_send(QTestState *s, const char *buf)
     socket_send(s->fd, buf, strlen(buf));
 }
 
-static void GCC_FMT_ATTR(2, 3) qtest_sendf(QTestState *s, const char *fmt, ...)
+static void G_GNUC_PRINTF(2, 3) qtest_sendf(QTestState *s, const char *fmt, ...)
 {
     va_list ap;
 

tests/qtest/migration-helpers.h

@@ -16,13 +16,13 @@
 
 extern bool got_stop;
 
-GCC_FMT_ATTR(3, 4)
+G_GNUC_PRINTF(3, 4)
 QDict *wait_command_fd(QTestState *who, int fd, const char *command, ...);
 
-GCC_FMT_ATTR(2, 3)
+G_GNUC_PRINTF(2, 3)
 QDict *wait_command(QTestState *who, const char *command, ...);
 
-GCC_FMT_ATTR(3, 4)
+G_GNUC_PRINTF(3, 4)
 void migrate_qmp(QTestState *who, const char *uri, const char *fmt, ...);
 
 QDict *migrate_query(QTestState *who);

tests/unit/test-qobject-input-visitor.c

@@ -64,7 +64,7 @@ static Visitor *test_init_internal(TestInputVisitorData *data, bool keyval,
     return data->qiv;
 }
 
-static GCC_FMT_ATTR(3, 4)
+static G_GNUC_PRINTF(3, 4)
 Visitor *visitor_input_test_init_full(TestInputVisitorData *data,
                                       bool keyval,
                                       const char *json_string, ...)
@@ -79,7 +79,7 @@ Visitor *visitor_input_test_init_full(TestInputVisitorData *data,
     return v;
 }
 
-static GCC_FMT_ATTR(2, 3)
+static G_GNUC_PRINTF(2, 3)
 Visitor *visitor_input_test_init(TestInputVisitorData *data,
                                  const char *json_string, ...)
 {