Add macros wrapping all usage of gcc's __attribute__.

Until now __attribute__() was defined to be empty for all compilers but
gcc. That's problematic because it prevents using it in other compilers;
which is necessary e.g. for atomics portability.  It's also just
generally dubious to do so in a header as widely included as c.h.

Instead add pg_attribute_format_arg, pg_attribute_printf,
pg_attribute_noreturn macros which are implemented in the compilers that
understand them. Also add pg_attribute_noreturn and pg_attribute_packed,
but don't provide fallbacks, since they can affect functionality.

This means that external code that, possibly unwittingly, relied on
__attribute__ defined to be empty on !gcc compilers may now run into
warnings or errors on those compilers. But there shouldn't be many
occurances of that and it's hard to work around...

Discussion: 54B58BA3.8040302@ohmu.fi
Author: Oskari Saarenmaa, with some minor changes by me.

contrib/cube/cubescan.l

@@ -60,7 +60,7 @@ float        ({integer}|{real})([eE]{integer})?
 
 %%
 
-void __attribute__((noreturn))
+void pg_attribute_noreturn
 yyerror(NDBOX **result, const char *message)
 {
 	if (*yytext == YY_END_OF_BUFFER_CHAR)

contrib/pg_upgrade/pg_upgrade.h

@@ -359,7 +359,7 @@ void		optionally_create_toast_tables(void);
 bool
 exec_prog(const char *log_file, const char *opt_log_file,
 		  bool throw_error, const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 4, 5)));
+pg_attribute_printf(4, 5);
 void		verify_directories(void);
 bool		pid_lock_file_exists(const char *datadir);
 
@@ -445,7 +445,7 @@ void		init_tablespaces(void);
 PGconn	   *connectToServer(ClusterInfo *cluster, const char *db_name);
 PGresult *
 executeQueryOrDie(PGconn *conn, const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 
 char	   *cluster_conn_opts(ClusterInfo *cluster);
 
@@ -462,17 +462,17 @@ int			get_user_info(char **user_name_p);
 void		check_ok(void);
 void
 report_status(eLogType type, const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 void
 pg_log(eLogType type, const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 void
 pg_fatal(const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2), noreturn));
+pg_attribute_printf(1, 2) pg_attribute_noreturn;
 void		end_progress_output(void);
 void
 prep_status(const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 void		check_ok(void);
 const char *getErrorText(int errNum);
 unsigned int str2uint(const char *str);
@@ -489,7 +489,7 @@ void old_9_3_check_for_line_data_type_usage(ClusterInfo *cluster);
 void
 parallel_exec_prog(const char *log_file, const char *opt_log_file,
 				   const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
+pg_attribute_printf(3, 4);
 void parallel_transfer_all_new_dbs(DbInfoArr *old_db_arr, DbInfoArr *new_db_arr,
 							  char *old_pgdata, char *new_pgdata,
 							  char *old_tablespace);

contrib/pg_upgrade/util.c

@@ -82,7 +82,7 @@ prep_status(const char *fmt,...)
 
 
 static
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 0)))
+pg_attribute_printf(2, 0)
 void
 pg_log_v(eLogType type, const char *fmt, va_list ap)
 {

contrib/pg_xlogdump/pg_xlogdump.c

@@ -69,7 +69,7 @@ typedef struct XLogDumpStats
 
 static void
 fatal_error(const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 /*
  * Big red button to push when things go horribly wrong.

contrib/pgcrypto/px.h

@@ -208,7 +208,7 @@ void		px_memset(void *ptr, int c, size_t len);
 #ifdef PX_DEBUG
 void
 px_debug(const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 #else
 #define px_debug(...)
 #endif

contrib/seg/segscan.l

@@ -59,7 +59,7 @@ float        ({integer}|{real})([eE]{integer})?
 
 %%
 
-void __attribute__((noreturn))
+void pg_attribute_noreturn
 yyerror(SEG *result, const char *message)
 {
 	if (*yytext == YY_END_OF_BUFFER_CHAR)

src/backend/access/transam/xlogreader.c

@@ -36,7 +36,7 @@ static void
 report_invalid_record(XLogReaderState *state, const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 
 static void ResetDecoder(XLogReaderState *state);
 

src/backend/postmaster/autovacuum.c

@@ -286,8 +286,8 @@ int			AutovacuumLauncherPid = 0;
 static pid_t avlauncher_forkexec(void);
 static pid_t avworker_forkexec(void);
 #endif
-NON_EXEC_STATIC void AutoVacWorkerMain(int argc, char *argv[]) __attribute__((noreturn));
-NON_EXEC_STATIC void AutoVacLauncherMain(int argc, char *argv[]) __attribute__((noreturn));
+NON_EXEC_STATIC void AutoVacWorkerMain(int argc, char *argv[]) pg_attribute_noreturn;
+NON_EXEC_STATIC void AutoVacLauncherMain(int argc, char *argv[]) pg_attribute_noreturn;
 
 static Oid	do_start_worker(void);
 static void launcher_determine_sleep(bool canlaunch, bool recursing,

src/backend/postmaster/pgarch.c

@@ -86,7 +86,7 @@ static volatile sig_atomic_t ready_to_stop = false;
 static pid_t pgarch_forkexec(void);
 #endif
 
-NON_EXEC_STATIC void PgArchiverMain(int argc, char *argv[]) __attribute__((noreturn));
+NON_EXEC_STATIC void PgArchiverMain(int argc, char *argv[]) pg_attribute_noreturn;
 static void pgarch_exit(SIGNAL_ARGS);
 static void ArchSigHupHandler(SIGNAL_ARGS);
 static void ArchSigTermHandler(SIGNAL_ARGS);

src/backend/postmaster/pgstat.c

@@ -251,7 +251,7 @@ static instr_time total_func_time;
 static pid_t pgstat_forkexec(void);
 #endif
 
-NON_EXEC_STATIC void PgstatCollectorMain(int argc, char *argv[]) __attribute__((noreturn));
+NON_EXEC_STATIC void PgstatCollectorMain(int argc, char *argv[]) pg_attribute_noreturn;
 static void pgstat_exit(SIGNAL_ARGS);
 static void pgstat_beshutdown_hook(int code, Datum arg);
 static void pgstat_sighup_handler(SIGNAL_ARGS);

src/backend/postmaster/postmaster.c

@@ -380,8 +380,8 @@ static void LogChildExit(int lev, const char *procname,
 			 int pid, int exitstatus);
 static void PostmasterStateMachine(void);
 static void BackendInitialize(Port *port);
-static void BackendRun(Port *port) __attribute__((noreturn));
-static void ExitPostmaster(int status) __attribute__((noreturn));
+static void BackendRun(Port *port) pg_attribute_noreturn;
+static void ExitPostmaster(int status) pg_attribute_noreturn;
 static int	ServerLoop(void);
 static int	BackendStartup(Port *port);
 static int	ProcessStartupPacket(Port *port, bool SSLdone);

src/backend/postmaster/syslogger.c

@@ -130,7 +130,7 @@ static volatile sig_atomic_t rotation_requested = false;
 static pid_t syslogger_forkexec(void);
 static void syslogger_parseArgs(int argc, char *argv[]);
 #endif
-NON_EXEC_STATIC void SysLoggerMain(int argc, char *argv[]) __attribute__((noreturn));
+NON_EXEC_STATIC void SysLoggerMain(int argc, char *argv[]) pg_attribute_noreturn;
 static void process_pipe_input(char *logbuffer, int *bytes_in_logbuffer);
 static void flush_pipe_input(char *logbuffer, int *bytes_in_logbuffer);
 static void open_csvlogfile(void);

src/backend/replication/repl_scanner.l

@@ -205,7 +205,7 @@ addlitchar(unsigned char ychar)
 	appendStringInfoChar(&litbuf, ychar);
 }
 
-void __attribute__((noreturn))
+void pg_attribute_noreturn
 yyerror(const char *message)
 {
 	ereport(ERROR,

src/backend/replication/walsender.c

@@ -193,7 +193,7 @@ typedef void (*WalSndSendDataCallback) (void);
 static void WalSndLoop(WalSndSendDataCallback send_data);
 static void InitWalSenderSlot(void);
 static void WalSndKill(int code, Datum arg);
-static void WalSndShutdown(void) __attribute__((noreturn));
+static void WalSndShutdown(void) pg_attribute_noreturn;
 static void XLogSendPhysical(void);
 static void XLogSendLogical(void);
 static void WalSndDone(WalSndSendDataCallback send_data);

src/backend/utils/error/elog.c

@@ -86,7 +86,7 @@ static const char *
 err_gettext(const char *str)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format_arg(1)));
+pg_attribute_format_arg(1);
 static void set_errdata_field(MemoryContextData *cxt, char **ptr, const char *str);
 
 /* Global variables */

src/backend/utils/misc/guc.c

@@ -132,7 +132,7 @@ char	   *GUC_check_errhint_string;
 static void
 do_serialize(char **destptr, Size *maxbytes, const char *fmt,...)
 /* This lets gcc check the format string for consistency. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
+pg_attribute_printf(3, 4);
 
 static void set_config_sourcefile(const char *name, char *sourcefile,
 					  int sourceline);

src/bin/pg_ctl/pg_ctl.c

@@ -120,7 +120,7 @@ static void
 write_stderr(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 static void do_advice(void);
 static void do_help(void);
 static void set_mode(char *modeopt);

src/bin/pg_dump/parallel.c

@@ -81,7 +81,7 @@ static ParallelSlot *GetMyPSlot(ParallelState *pstate);
 static void
 parallel_msg_master(ParallelSlot *slot, const char *modulename,
 					const char *fmt, va_list ap)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 0)));
+pg_attribute_printf(3, 0);
 static void archive_close_connection(int code, void *arg);
 static void ShutdownWorkersHard(ParallelState *pstate);
 static void WaitForTerminatingWorkers(ParallelState *pstate);

src/bin/pg_dump/pg_backup.h

@@ -280,7 +280,7 @@ extern void archputs(const char *s, Archive *AH);
 extern int
 archprintf(Archive *AH, const char *fmt,...)
 /* This extension allows gcc to check the format string */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 
 #define appendStringLiteralAH(buf,str,AH) \
 	appendStringLiteral(buf, str, (AH)->encoding, (AH)->std_strings)

src/bin/pg_dump/pg_backup_archiver.h

@@ -378,7 +378,7 @@ struct _tocEntry
 extern int	parallel_restore(struct ParallelArgs *args);
 extern void on_exit_close_archive(Archive *AHX);
 
-extern void warn_or_exit_horribly(ArchiveHandle *AH, const char *modulename, const char *fmt,...) __attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
+extern void warn_or_exit_horribly(ArchiveHandle *AH, const char *modulename, const char *fmt,...) pg_attribute_printf(3, 4);
 
 extern void WriteTOC(ArchiveHandle *AH);
 extern void ReadTOC(ArchiveHandle *AH);
@@ -429,8 +429,8 @@ extern int	ReconnectToServer(ArchiveHandle *AH, const char *dbname, const char *
 extern void DropBlobIfExists(ArchiveHandle *AH, Oid oid);
 
 void		ahwrite(const void *ptr, size_t size, size_t nmemb, ArchiveHandle *AH);
-int			ahprintf(ArchiveHandle *AH, const char *fmt,...) __attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+int			ahprintf(ArchiveHandle *AH, const char *fmt,...) pg_attribute_printf(2, 3);
 
-void		ahlog(ArchiveHandle *AH, int level, const char *fmt,...) __attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
+void		ahlog(ArchiveHandle *AH, int level, const char *fmt,...) pg_attribute_printf(3, 4);
 
 #endif

src/bin/pg_dump/pg_backup_tar.c

@@ -115,7 +115,7 @@ static void tarClose(ArchiveHandle *AH, TAR_MEMBER *TH);
 #ifdef __NOT_USED__
 static char *tarGets(char *buf, size_t len, TAR_MEMBER *th);
 #endif
-static int	tarPrintf(ArchiveHandle *AH, TAR_MEMBER *th, const char *fmt,...) __attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
+static int	tarPrintf(ArchiveHandle *AH, TAR_MEMBER *th, const char *fmt,...) pg_attribute_printf(3, 4);
 
 static void _tarAddFile(ArchiveHandle *AH, TAR_MEMBER *th);
 static TAR_MEMBER *_tarPositionTo(ArchiveHandle *AH, const char *filename);

src/bin/pg_dump/pg_backup_utils.h

@@ -30,15 +30,15 @@ extern const char *progname;
 extern void set_dump_section(const char *arg, int *dumpSections);
 extern void
 write_msg(const char *modulename, const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 extern void
 vwrite_msg(const char *modulename, const char *fmt, va_list ap)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 0)));
+pg_attribute_printf(2, 0);
 extern void on_exit_nicely(on_exit_nicely_callback function, void *arg);
-extern void exit_nicely(int code) __attribute__((noreturn));
+extern void exit_nicely(int code) pg_attribute_noreturn;
 
 extern void
 exit_horribly(const char *modulename, const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3), noreturn));
+pg_attribute_printf(2, 3) pg_attribute_noreturn;
 
 #endif   /* PG_BACKUP_UTILS_H */

src/bin/psql/common.h

@@ -21,7 +21,7 @@ extern bool setQFout(const char *fname);
 extern void
 psql_error(const char *fmt,...)
 /* This lets gcc check the format string for consistency. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 extern void NoticeProcessor(void *arg, const char *message);
 

src/bin/psql/large_obj.c

@@ -14,7 +14,7 @@
 
 static void
 print_lo_result(const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 static void
 print_lo_result(const char *fmt,...)

src/include/bootstrap/bootstrap.h

@@ -32,7 +32,7 @@ extern Form_pg_attribute attrtypes[MAXATTR];
 extern int	numattr;
 
 
-extern void AuxiliaryProcessMain(int argc, char *argv[]) __attribute__((noreturn));
+extern void AuxiliaryProcessMain(int argc, char *argv[]) pg_attribute_noreturn;
 
 extern void err_out(void);
 
@@ -61,6 +61,6 @@ extern void boot_get_type_io_data(Oid typid,
 extern int	boot_yyparse(void);
 
 extern int	boot_yylex(void);
-extern void boot_yyerror(const char *str) __attribute__((noreturn));
+extern void boot_yyerror(const char *str) pg_attribute_noreturn;
 
 #endif   /* BOOTSTRAP_H */

src/include/c.h

@@ -156,10 +156,6 @@
 #define dummyret	char
 #endif
 
-#ifndef __GNUC__
-#define __attribute__(_arg_)
-#endif
-
 /* ----------------------------------------------------------------
  *				Section 2:	bool, true, false, TRUE, FALSE, NULL
  * ----------------------------------------------------------------
@@ -560,6 +556,47 @@ typedef NameData *Name;
 /* we don't currently need wider versions of the other ALIGN macros */
 #define MAXALIGN64(LEN)			TYPEALIGN64(MAXIMUM_ALIGNOF, (LEN))
 
+/* ----------------
+ * Attribute macros
+ *
+ * GCC: https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
+ * GCC: https://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html
+ * Sunpro: https://docs.oracle.com/cd/E18659_01/html/821-1384/gjzke.html
+ * XLC: http://www-01.ibm.com/support/knowledgecenter/SSGH2K_11.1.0/com.ibm.xlc111.aix.doc/language_ref/function_attributes.html
+ * XLC: http://www-01.ibm.com/support/knowledgecenter/SSGH2K_11.1.0/com.ibm.xlc111.aix.doc/language_ref/type_attrib.html
+ * ----------------
+ */
+
+/* only GCC supports the unused attribute */
+#ifdef __GNUC__
+#define pg_attribute_unused __attribute__((unused))
+#else
+#define pg_attribute_unused
+#endif
+
+/* GCC and XLC support format attributes */
+#if defined(__GNUC__) || defined(__IBMC__)
+#define pg_attribute_format_arg(a) __attribute__((format_arg(a)))
+#define pg_attribute_printf(f,a) __attribute__((format(PG_PRINTF_ATTRIBUTE, f, a)))
+#else
+#define pg_attribute_format_arg(a)
+#define pg_attribute_printf(f,a)
+#endif
+
+/* GCC, Sunpro and XLC support aligned, packed and noreturn */
+#if defined(__GNUC__) || defined(__SUNPRO_C) || defined(__IBMC__)
+#define pg_attribute_aligned(a) __attribute__((aligned(a)))
+#define pg_attribute_noreturn __attribute__((noreturn))
+#define pg_attribute_packed __attribute__((packed))
+#else
+/*
+ * NB: aligned and packed are not defined as empty as they affect code
+ * functionality; they must be implemented by the compiler if they are to be
+ * used.
+ */
+#define pg_attribute_noreturn
+#endif
+
 /* ----------------------------------------------------------------
  *				Section 6:	assertions
  * ----------------------------------------------------------------
@@ -906,7 +943,7 @@ typedef NameData *Name;
 #ifdef USE_ASSERT_CHECKING
 #define PG_USED_FOR_ASSERTS_ONLY
 #else
-#define PG_USED_FOR_ASSERTS_ONLY __attribute__((unused))
+#define PG_USED_FOR_ASSERTS_ONLY pg_attribute_unused
 #endif
 
 
@@ -973,7 +1010,7 @@ typedef NameData *Name;
 extern int
 snprintf(char *str, size_t count, const char *fmt,...)
 /* This extension allows gcc to check the format string */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
+pg_attribute_printf(3, 4);
 #endif
 
 #if !HAVE_DECL_VSNPRINTF

src/include/common/fe_memutils.h

@@ -26,9 +26,9 @@ extern void pfree(void *pointer);
 /* sprintf into a palloc'd buffer --- these are in psprintf.c */
 extern char *
 psprintf(const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 extern size_t
 pvsnprintf(char *buf, size_t len, const char *fmt, va_list args)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 0)));
+pg_attribute_printf(3, 0);
 
 #endif   /* FE_MEMUTILS_H */

src/include/lib/stringinfo.h

@@ -95,7 +95,7 @@ extern void resetStringInfo(StringInfo str);
 extern void
 appendStringInfo(StringInfo str, const char *fmt,...)
 /* This extension allows gcc to check the format string */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 
 /*------------------------
  * appendStringInfoVA
@@ -108,7 +108,7 @@ __attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
  */
 extern int
 appendStringInfoVA(StringInfo str, const char *fmt, va_list args)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 0)));
+pg_attribute_printf(2, 0);
 
 /*------------------------
  * appendStringInfoString

src/include/mb/pg_wchar.h

@@ -514,9 +514,9 @@ extern void check_encoding_conversion_args(int src_encoding,
 							   int expected_src_encoding,
 							   int expected_dest_encoding);
 
-extern void report_invalid_encoding(int encoding, const char *mbstr, int len) __attribute__((noreturn));
+extern void report_invalid_encoding(int encoding, const char *mbstr, int len) pg_attribute_noreturn;
 extern void report_untranslatable_char(int src_encoding, int dest_encoding,
-					   const char *mbstr, int len) __attribute__((noreturn));
+					   const char *mbstr, int len) pg_attribute_noreturn;
 
 extern void pg_ascii2mic(const unsigned char *l, unsigned char *p, int len);
 extern void pg_mic2ascii(const unsigned char *mic, unsigned char *p, int len);

src/include/parser/parse_relation.h

@@ -85,9 +85,9 @@ extern bool isLockedRefname(ParseState *pstate, const char *refname);
 extern void addRTEtoQuery(ParseState *pstate, RangeTblEntry *rte,
 			  bool addToJoinList,
 			  bool addToRelNameSpace, bool addToVarNameSpace);
-extern void errorMissingRTE(ParseState *pstate, RangeVar *relation) __attribute__((noreturn));
+extern void errorMissingRTE(ParseState *pstate, RangeVar *relation) pg_attribute_noreturn;
 extern void errorMissingColumn(ParseState *pstate,
-	   char *relname, char *colname, int location) __attribute__((noreturn));
+	   char *relname, char *colname, int location) pg_attribute_noreturn;
 extern void expandRTE(RangeTblEntry *rte, int rtindex, int sublevels_up,
 		  int location, bool include_dropped,
 		  List **colnames, List **colvars);

src/include/parser/scanner.h

@@ -124,6 +124,6 @@ extern void scanner_finish(core_yyscan_t yyscanner);
 extern int core_yylex(core_YYSTYPE *lvalp, YYLTYPE *llocp,
 		   core_yyscan_t yyscanner);
 extern int	scanner_errposition(int location, core_yyscan_t yyscanner);
-extern void scanner_yyerror(const char *message, core_yyscan_t yyscanner) __attribute__((noreturn));
+extern void scanner_yyerror(const char *message, core_yyscan_t yyscanner) pg_attribute_noreturn;
 
 #endif   /* SCANNER_H */

src/include/pgstat.h

@@ -875,7 +875,7 @@ extern void pgstat_reset_all(void);
 extern void allow_immediate_pgstat_restart(void);
 
 #ifdef EXEC_BACKEND
-extern void PgstatCollectorMain(int argc, char *argv[]) __attribute__((noreturn));
+extern void PgstatCollectorMain(int argc, char *argv[]) pg_attribute_noreturn;
 #endif
 
 

src/include/port.h

@@ -156,25 +156,25 @@ extern int	pg_vsnprintf(char *str, size_t count, const char *fmt, va_list args);
 extern int
 pg_snprintf(char *str, size_t count, const char *fmt,...)
 /* This extension allows gcc to check the format string */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
+pg_attribute_printf(3, 4);
 extern int
 pg_sprintf(char *str, const char *fmt,...)
 /* This extension allows gcc to check the format string */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 extern int	pg_vfprintf(FILE *stream, const char *fmt, va_list args);
 extern int
 pg_fprintf(FILE *stream, const char *fmt,...)
 /* This extension allows gcc to check the format string */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 extern int
 pg_printf(const char *fmt,...)
 /* This extension allows gcc to check the format string */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 /*
- *	The GCC-specific code below prevents the __attribute__(... 'printf')
- *	above from being replaced, and this is required because gcc doesn't
- *	know anything about pg_printf.
+ *	The GCC-specific code below prevents the pg_attribute_printf above from
+ *	being replaced, and this is required because gcc doesn't know anything
+ *	about pg_printf.
  */
 #ifdef __GNUC__
 #define vsnprintf(...)	pg_vsnprintf(__VA_ARGS__)

src/include/port/atomics/generic-gcc.h

@@ -98,7 +98,7 @@ typedef struct pg_atomic_uint32
 
 typedef struct pg_atomic_uint64
 {
-	volatile uint64 value __attribute__((aligned(8)));
+	volatile uint64 value pg_attribute_aligned(8);
 } pg_atomic_uint64;
 
 #endif /* defined(HAVE_GCC__ATOMIC_INT64_CAS) || defined(HAVE_GCC__SYNC_INT64_CAS) */

src/include/port/atomics/generic-sunpro.h

@@ -61,7 +61,7 @@ typedef struct pg_atomic_uint64
 	 * it proves to be a problem, we'll have to add more version checks for 64
 	 * bit support.
 	 */
-	volatile uint64 value __attribute__((__aligned__(8)));
+	volatile uint64 value pg_attribute_aligned(8);
 } pg_atomic_uint64;
 
 #endif /* HAVE_ATOMIC_H */

src/include/port/atomics/generic-xlc.h

@@ -32,7 +32,7 @@ typedef struct pg_atomic_uint32
 #define PG_HAVE_ATOMIC_U64_SUPPORT
 typedef struct pg_atomic_uint64
 {
-	volatile uint64 value __attribute__((__aligned__(8)));
+	volatile uint64 value pg_attribute_aligned(8);
 } pg_atomic_uint64;
 
 #endif /* __64BIT__ */

src/include/postgres.h

@@ -687,6 +687,6 @@ extern Datum Float8GetDatum(float8 X);
  */
 extern void ExceptionalCondition(const char *conditionName,
 					 const char *errorType,
-			 const char *fileName, int lineNumber) __attribute__((noreturn));
+			 const char *fileName, int lineNumber) pg_attribute_noreturn;
 
 #endif   /* POSTGRES_H */

src/include/postmaster/autovacuum.h

@@ -54,8 +54,8 @@ extern void AutoVacWorkerFailed(void);
 extern void AutoVacuumUpdateDelay(void);
 
 #ifdef EXEC_BACKEND
-extern void AutoVacLauncherMain(int argc, char *argv[]) __attribute__((noreturn));
-extern void AutoVacWorkerMain(int argc, char *argv[]) __attribute__((noreturn));
+extern void AutoVacLauncherMain(int argc, char *argv[]) pg_attribute_noreturn;
+extern void AutoVacWorkerMain(int argc, char *argv[]) pg_attribute_noreturn;
 extern void AutovacuumWorkerIAm(void);
 extern void AutovacuumLauncherIAm(void);
 #endif

src/include/postmaster/bgworker_internals.h

@@ -46,7 +46,7 @@ extern void BackgroundWorkerStopNotifications(pid_t pid);
 extern void ResetBackgroundWorkerCrashTimes(void);
 
 /* Function to start a background worker, called from postmaster.c */
-extern void StartBackgroundWorker(void) __attribute__((noreturn));
+extern void StartBackgroundWorker(void) pg_attribute_noreturn;
 
 #ifdef EXEC_BACKEND
 extern BackgroundWorker *BackgroundWorkerEntry(int slotno);

src/include/postmaster/bgwriter.h

@@ -25,8 +25,8 @@ extern int	CheckPointTimeout;
 extern int	CheckPointWarning;
 extern double CheckPointCompletionTarget;
 
-extern void BackgroundWriterMain(void) __attribute__((noreturn));
-extern void CheckpointerMain(void) __attribute__((noreturn));
+extern void BackgroundWriterMain(void) pg_attribute_noreturn;
+extern void CheckpointerMain(void) pg_attribute_noreturn;
 
 extern void RequestCheckpoint(int flags);
 extern void CheckpointWriteDelay(int flags, double progress);

src/include/postmaster/pgarch.h

@@ -33,7 +33,7 @@
 extern int	pgarch_start(void);
 
 #ifdef EXEC_BACKEND
-extern void PgArchiverMain(int argc, char *argv[]) __attribute__((noreturn));
+extern void PgArchiverMain(int argc, char *argv[]) pg_attribute_noreturn;
 #endif
 
 #endif   /* _PGARCH_H */

src/include/postmaster/postmaster.h

@@ -46,7 +46,7 @@ extern int	postmaster_alive_fds[2];
 
 extern const char *progname;
 
-extern void PostmasterMain(int argc, char *argv[]) __attribute__((noreturn));
+extern void PostmasterMain(int argc, char *argv[]) pg_attribute_noreturn;
 extern void ClosePostmasterPorts(bool am_syslogger);
 
 extern int	MaxLivePostmasterChildren(void);
@@ -56,7 +56,7 @@ extern bool PostmasterMarkPIDForWorkerNotify(int);
 
 #ifdef EXEC_BACKEND
 extern pid_t postmaster_forkexec(int argc, char *argv[]);
-extern void SubPostmasterMain(int argc, char *argv[]) __attribute__((noreturn));
+extern void SubPostmasterMain(int argc, char *argv[]) pg_attribute_noreturn;
 
 extern Size ShmemBackendArraySize(void);
 extern void ShmemBackendArrayAllocation(void);

src/include/postmaster/startup.h

@@ -13,7 +13,7 @@
 #define _STARTUP_H
 
 extern void HandleStartupProcInterrupts(void);
-extern void StartupProcessMain(void) __attribute__((noreturn));
+extern void StartupProcessMain(void) pg_attribute_noreturn;
 extern void PreRestoreCommand(void);
 extern void PostRestoreCommand(void);
 extern bool IsPromoteTriggered(void);

src/include/postmaster/syslogger.h

@@ -84,7 +84,7 @@ extern int	SysLogger_Start(void);
 extern void write_syslogger_file(const char *buffer, int count, int dest);
 
 #ifdef EXEC_BACKEND
-extern void SysLoggerMain(int argc, char *argv[]) __attribute__((noreturn));
+extern void SysLoggerMain(int argc, char *argv[]) pg_attribute_noreturn;
 #endif
 
 #endif   /* _SYSLOGGER_H */

src/include/postmaster/walwriter.h

@@ -15,6 +15,6 @@
 /* GUC options */
 extern int	WalWriterDelay;
 
-extern void WalWriterMain(void) __attribute__((noreturn));
+extern void WalWriterMain(void) pg_attribute_noreturn;
 
 #endif   /* _WALWRITER_H */

src/include/replication/walreceiver.h

@@ -147,7 +147,7 @@ typedef void (*walrcv_disconnect_type) (void);
 extern PGDLLIMPORT walrcv_disconnect_type walrcv_disconnect;
 
 /* prototypes for functions in walreceiver.c */
-extern void WalReceiverMain(void) __attribute__((noreturn));
+extern void WalReceiverMain(void) pg_attribute_noreturn;
 
 /* prototypes for functions in walreceiverfuncs.c */
 extern Size WalRcvShmemSize(void);

src/include/storage/ipc.h

@@ -64,7 +64,7 @@ typedef void (*shmem_startup_hook_type) (void);
 /* ipc.c */
 extern PGDLLIMPORT bool proc_exit_inprogress;
 
-extern void proc_exit(int code) __attribute__((noreturn));
+extern void proc_exit(int code) pg_attribute_noreturn;
 extern void shmem_exit(int code);
 extern void on_proc_exit(pg_on_exit_callback function, Datum arg);
 extern void on_shmem_exit(pg_on_exit_callback function, Datum arg);

src/include/storage/itemptr.h

@@ -41,7 +41,7 @@ typedef struct ItemPointerData
 }
 
 #ifdef __arm__
-__attribute__((packed))			/* Appropriate whack upside the head for ARM */
+pg_attribute_packed			/* Appropriate whack upside the head for ARM */
 #endif
 ItemPointerData;
 

src/include/storage/lock.h

@@ -547,7 +547,7 @@ extern void lock_twophase_standby_recover(TransactionId xid, uint16 info,
 
 extern DeadLockState DeadLockCheck(PGPROC *proc);
 extern PGPROC *GetBlockingAutoVacuumPgproc(void);
-extern void DeadLockReport(void) __attribute__((noreturn));
+extern void DeadLockReport(void) pg_attribute_noreturn;
 extern void RememberSimpleDeadLock(PGPROC *proc1,
 					   LOCKMODE lockmode,
 					   LOCK *lock,

src/include/tcop/tcopprot.h

@@ -62,9 +62,9 @@ extern bool check_max_stack_depth(int *newval, void **extra, GucSource source);
 extern void assign_max_stack_depth(int newval, void *extra);
 
 extern void die(SIGNAL_ARGS);
-extern void quickdie(SIGNAL_ARGS) __attribute__((noreturn));
+extern void quickdie(SIGNAL_ARGS) pg_attribute_noreturn;
 extern void StatementCancelHandler(SIGNAL_ARGS);
-extern void FloatExceptionHandler(SIGNAL_ARGS) __attribute__((noreturn));
+extern void FloatExceptionHandler(SIGNAL_ARGS) pg_attribute_noreturn;
 extern void RecoveryConflictInterrupt(ProcSignalReason reason); /* called from SIGUSR1
 																 * handler */
 extern void ProcessClientReadInterrupt(bool blocked);
@@ -74,7 +74,7 @@ extern void process_postgres_switches(int argc, char *argv[],
 						  GucContext ctx, const char **dbname);
 extern void PostgresMain(int argc, char *argv[],
 			 const char *dbname,
-			 const char *username) __attribute__((noreturn));
+			 const char *username) pg_attribute_noreturn;
 extern long get_stack_depth_rlimit(void);
 extern void ResetUsage(void);
 extern void ShowUsage(const char *title);

src/include/utils/datetime.h

@@ -315,7 +315,7 @@ extern int DecodeISO8601Interval(char *str,
 					  int *dtype, struct pg_tm * tm, fsec_t *fsec);
 
 extern void DateTimeParseError(int dterr, const char *str,
-				   const char *datatype) __attribute__((noreturn));
+				   const char *datatype) pg_attribute_noreturn;
 
 extern int	DetermineTimeZoneOffset(struct pg_tm * tm, pg_tz *tzp);
 extern int	DetermineTimeZoneAbbrevOffset(struct pg_tm * tm, const char *abbr, pg_tz *tzp);

src/include/utils/elog.h

@@ -147,61 +147,61 @@ extern int
 errmsg(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 extern int
 errmsg_internal(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 extern int
 errmsg_plural(const char *fmt_singular, const char *fmt_plural,
 			  unsigned long n,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 4)))
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 4)));
+pg_attribute_printf(1, 4)
+pg_attribute_printf(2, 4);
 
 extern int
 errdetail(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 extern int
 errdetail_internal(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 extern int
 errdetail_log(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 extern int
 errdetail_log_plural(const char *fmt_singular, const char *fmt_plural,
 					 unsigned long n,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 4)))
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 4)));
+pg_attribute_printf(1, 4)
+pg_attribute_printf(2, 4);
 
 extern int
 errdetail_plural(const char *fmt_singular, const char *fmt_plural,
 				 unsigned long n,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 4)))
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 4)));
+pg_attribute_printf(1, 4)
+pg_attribute_printf(2, 4);
 
 extern int
 errhint(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 /*
  * errcontext() is typically called in error context callback functions, not
@@ -218,7 +218,7 @@ extern int
 errcontext_msg(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 extern int	errhidestmt(bool hide_stmt);
 extern int	errhidecontext(bool hide_ctx);
@@ -278,7 +278,7 @@ extern void
 elog_finish(int elevel, const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 
 
 /* Support for constructing error strings separately from ereport() calls */
@@ -288,7 +288,7 @@ extern char *
 format_elog_string(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 
 /* Support for attaching context information to error reports */
@@ -364,7 +364,7 @@ extern PGDLLIMPORT ErrorContextCallback *error_context_stack;
 	} while (0)
 
 /*
- * gcc understands __attribute__((noreturn)); for other compilers, insert
+ * gcc understands pg_attribute_noreturn; for other compilers, insert
  * pg_unreachable() so that the compiler gets the point.
  */
 #ifdef __GNUC__
@@ -423,9 +423,9 @@ extern void EmitErrorReport(void);
 extern ErrorData *CopyErrorData(void);
 extern void FreeErrorData(ErrorData *edata);
 extern void FlushErrorState(void);
-extern void ReThrowError(ErrorData *edata) __attribute__((noreturn));
+extern void ReThrowError(ErrorData *edata) pg_attribute_noreturn;
 extern void ThrowErrorData(ErrorData *edata);
-extern void pg_re_throw(void) __attribute__((noreturn));
+extern void pg_re_throw(void) pg_attribute_noreturn;
 
 extern char *GetErrorContextStack(void);
 
@@ -472,6 +472,6 @@ extern void
 write_stderr(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 
 #endif   /* ELOG_H */

src/include/utils/help_config.h

@@ -12,6 +12,6 @@
 #ifndef HELP_CONFIG_H
 #define HELP_CONFIG_H 1
 
-extern void GucInfoMain(void) __attribute__((noreturn));
+extern void GucInfoMain(void) pg_attribute_noreturn;
 
 #endif

src/include/utils/palloc.h

@@ -138,9 +138,9 @@ extern char *pnstrdup(const char *in, Size len);
 /* sprintf into a palloc'd buffer --- these are in psprintf.c */
 extern char *
 psprintf(const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 extern size_t
 pvsnprintf(char *buf, size_t len, const char *fmt, va_list args)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 0)));
+pg_attribute_printf(3, 0);
 
 #endif   /* PALLOC_H */

src/interfaces/ecpg/ecpglib/extern.h

@@ -185,7 +185,7 @@ void		ecpg_raise(int line, int code, const char *sqlstate, const char *str);
 void		ecpg_raise_backend(int line, PGresult *result, PGconn *conn, int compat);
 char	   *ecpg_prepared(const char *, struct connection *);
 bool		ecpg_deallocate_all_conn(int lineno, enum COMPAT_MODE c, struct connection * conn);
-void		ecpg_log(const char *format,...) __attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+void		ecpg_log(const char *format,...) pg_attribute_printf(1, 2);
 bool		ecpg_auto_prepare(int, const char *, const int, char **, const char *);
 void		ecpg_init_sqlca(struct sqlca_t * sqlca);
 

src/interfaces/ecpg/include/ecpglib.h

@@ -15,7 +15,7 @@
 #ifdef ENABLE_NLS
 extern char *
 ecpg_gettext(const char *msgid)
-__attribute__((format_arg(1)));
+pg_attribute_format_arg(1);
 #else
 #define ecpg_gettext(x) (x)
 #endif

src/interfaces/ecpg/preproc/ecpg.header

@@ -64,7 +64,7 @@ static struct ECPGtype ecpg_query = {ECPGt_char_variable, NULL, NULL, NULL, {NUL
 /*
  * Handle parsing errors and warnings
  */
-static void __attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 0)))
+static void pg_attribute_printf(3, 0)
 vmmerror(int error_code, enum errortype type, const char *error, va_list ap)
 {
 	/* localize the error message string */

src/interfaces/ecpg/preproc/extern.h

@@ -77,8 +77,8 @@ extern int	base_yylex(void);
 extern void base_yyerror(const char *);
 extern void *mm_alloc(size_t), *mm_realloc(void *, size_t);
 extern char *mm_strdup(const char *);
-extern void mmerror(int errorcode, enum errortype type, const char *error,...) __attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
-extern void mmfatal(int errorcode, const char *error,...) __attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3), noreturn));
+extern void mmerror(int errorcode, enum errortype type, const char *error,...) pg_attribute_printf(3, 4);
+extern void mmfatal(int errorcode, const char *error,...) pg_attribute_printf(2, 3) pg_attribute_noreturn;
 extern void output_get_descr_header(char *);
 extern void output_get_descr(char *, char *);
 extern void output_set_descr_header(char *);

src/interfaces/libpq/libpq-int.h

@@ -548,7 +548,7 @@ extern PGresult *pqPrepareAsyncResult(PGconn *conn);
 extern void
 pqInternalNotice(const PGNoticeHooks *hooks, const char *fmt,...)
 /* This lets gcc check the format string for consistency. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 extern void pqSaveMessageField(PGresult *res, char code,
 				   const char *value);
 extern void pqSaveParameterStatus(PGconn *conn, const char *name,
@@ -653,10 +653,10 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
 #ifdef ENABLE_NLS
 extern char *
 libpq_gettext(const char *msgid)
-__attribute__((format_arg(1)));
+pg_attribute_format_arg(1);
 extern char *
 libpq_ngettext(const char *msgid, const char *msgid_plural, unsigned long n)
-__attribute__((format_arg(1))) __attribute__((format_arg(2)));
+pg_attribute_format_arg(1) pg_attribute_format_arg(2);
 #else
 #define libpq_gettext(x) (x)
 #define libpq_ngettext(s, p, n) ((n) == 1 ? (s) : (p))

src/interfaces/libpq/pqexpbuffer.c

@@ -39,7 +39,7 @@ static const char oom_buffer[1] = "";
 
 static bool
 appendPQExpBufferVA(PQExpBuffer str, const char *fmt, va_list args)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 0)));
+pg_attribute_printf(2, 0);
 
 
 /*

src/interfaces/libpq/pqexpbuffer.h

@@ -149,7 +149,7 @@ extern int	enlargePQExpBuffer(PQExpBuffer str, size_t needed);
 extern void
 printfPQExpBuffer(PQExpBuffer str, const char *fmt,...)
 /* This extension allows gcc to check the format string */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 
 /*------------------------
  * appendPQExpBuffer
@@ -161,7 +161,7 @@ __attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
 extern void
 appendPQExpBuffer(PQExpBuffer str, const char *fmt,...)
 /* This extension allows gcc to check the format string */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 
 /*------------------------
  * appendPQExpBufferStr

src/interfaces/libpq/win32.c

@@ -36,7 +36,7 @@
 #ifdef ENABLE_NLS
 extern char *
 libpq_gettext(const char *msgid)
-__attribute__((format_arg(1)));
+pg_attribute_format_arg(1);
 #else
 #define libpq_gettext(x) (x)
 #endif

src/pl/plperl/plperl.h

@@ -30,9 +30,7 @@
  * Supply a value of PERL_UNUSED_DECL that will satisfy gcc - the one
  * perl itself supplies doesn't seem to.
  */
-#if defined(__GNUC__)
-#define PERL_UNUSED_DECL __attribute__ ((unused))
-#endif
+#define PERL_UNUSED_DECL pg_attribute_unused
 
 /*
  * Sometimes perl carefully scribbles on our *printf macros.

src/pl/plpgsql/src/pl_scanner.c

@@ -608,7 +608,7 @@ plpgsql_scanner_errposition(int location)
  * be misleading!
  */
 void
-__attribute__((noreturn))
+pg_attribute_noreturn
 plpgsql_yyerror(const char *message)
 {
 	char	   *yytext = core_yy.scanbuf + plpgsql_yylloc;

src/pl/plpython/plpy_elog.h

@@ -12,16 +12,16 @@ extern PyObject *PLy_exc_spi_error;
 
 extern void
 PLy_elog(int elevel, const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 
 extern void
 PLy_exception_set(PyObject *exc, const char *fmt,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 
 extern void
 PLy_exception_set_plural(PyObject *exc, const char *fmt_singular, const char *fmt_plural,
 						 unsigned long n,...)
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 5)))
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 5)));
+pg_attribute_printf(2, 5)
+pg_attribute_printf(3, 5);
 
 #endif   /* PLPY_ELOG_H */

src/test/modules/test_shm_mq/test_shm_mq.h

@@ -40,6 +40,6 @@ extern void test_shm_mq_setup(int64 queue_size, int32 nworkers,
 				  shm_mq_handle **input);
 
 /* Main entrypoint for a worker. */
-extern void test_shm_mq_main(Datum) __attribute__((noreturn));
+extern void test_shm_mq_main(Datum) pg_attribute_noreturn;
 
 #endif

src/test/modules/worker_spi/worker_spi.c

@@ -46,7 +46,7 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(worker_spi_launch);
 
 void		_PG_init(void);
-void		worker_spi_main(Datum) __attribute__((noreturn));
+void		worker_spi_main(Datum) pg_attribute_noreturn;
 
 /* flags set by signal handlers */
 static volatile sig_atomic_t got_sighup = false;

src/test/regress/pg_regress.c

@@ -135,17 +135,17 @@ static void
 header(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 static void
 status(const char *fmt,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
+pg_attribute_printf(1, 2);
 static void
 psql_command(const char *database, const char *query,...)
 /* This extension allows gcc to check the format string for consistency with
    the supplied arguments. */
-__attribute__((format(PG_PRINTF_ATTRIBUTE, 2, 3)));
+pg_attribute_printf(2, 3);
 
 #ifdef WIN32
 typedef BOOL (WINAPI * __CreateRestrictedToken) (HANDLE, DWORD, DWORD, PSID_AND_ATTRIBUTES, DWORD, PLUID_AND_ATTRIBUTES, DWORD, PSID_AND_ATTRIBUTES, PHANDLE);