Remove no-longer-required function declarations.

Remove a bunch of "extern Datum foo(PG_FUNCTION_ARGS);" declarations that
are no longer needed now that PG_FUNCTION_INFO_V1(foo) provides that.

Some of these were evidently missed in commit e7128e8d, but others
were cargo-culted in in code added since then.  Possibly that can be blamed
in part on the fact that we'd not fixed relevant documentation examples,
which I've now done.

contrib/hstore_plperl/hstore_plperl.c

@@ -9,7 +9,6 @@ PG_MODULE_MAGIC;
 
 
 PG_FUNCTION_INFO_V1(hstore_to_plperl);
-Datum		hstore_to_plperl(PG_FUNCTION_ARGS);
 
 Datum
 hstore_to_plperl(PG_FUNCTION_ARGS)
@@ -39,7 +38,6 @@ hstore_to_plperl(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(plperl_to_hstore);
-Datum		plperl_to_hstore(PG_FUNCTION_ARGS);
 
 Datum
 plperl_to_hstore(PG_FUNCTION_ARGS)

contrib/hstore_plpython/hstore_plpython.c

@@ -8,7 +8,6 @@ PG_MODULE_MAGIC;
 
 
 PG_FUNCTION_INFO_V1(hstore_to_plpython);
-Datum		hstore_to_plpython(PG_FUNCTION_ARGS);
 
 Datum
 hstore_to_plpython(PG_FUNCTION_ARGS)
@@ -45,7 +44,6 @@ hstore_to_plpython(PG_FUNCTION_ARGS)
 
 
 PG_FUNCTION_INFO_V1(plpython_to_hstore);
-Datum		plpython_to_hstore(PG_FUNCTION_ARGS);
 
 Datum
 plpython_to_hstore(PG_FUNCTION_ARGS)

contrib/ltree_plpython/ltree_plpython.c

@@ -7,7 +7,6 @@ PG_MODULE_MAGIC;
 
 
 PG_FUNCTION_INFO_V1(ltree_to_plpython);
-Datum		ltree_to_plpython(PG_FUNCTION_ARGS);
 
 Datum
 ltree_to_plpython(PG_FUNCTION_ARGS)

contrib/pg_audit/pg_audit.c

@@ -42,10 +42,6 @@ PG_MODULE_MAGIC;
 
 void		_PG_init(void);
 
-/* Prototypes for functions used with event triggers */
-Datum		pg_audit_ddl_command_end(PG_FUNCTION_ARGS);
-Datum		pg_audit_sql_drop(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(pg_audit_ddl_command_end);
 PG_FUNCTION_INFO_V1(pg_audit_sql_drop);
 

doc/src/sgml/event-trigger.sgml

@@ -998,8 +998,6 @@ typedef struct EventTriggerData
 
 PG_MODULE_MAGIC;
 
-Datum noddl(PG_FUNCTION_ARGS);
-
 PG_FUNCTION_INFO_V1(noddl);
 
 Datum

doc/src/sgml/gist.sgml

@@ -327,7 +327,6 @@ LANGUAGE C STRICT;
         And the matching code in the C module could then follow this skeleton:
 
 <programlisting>
-Datum       my_consistent(PG_FUNCTION_ARGS);
 PG_FUNCTION_INFO_V1(my_consistent);
 
 Datum
@@ -390,7 +389,6 @@ LANGUAGE C STRICT;
         And the matching code in the C module could then follow this skeleton:
 
 <programlisting>
-Datum       my_union(PG_FUNCTION_ARGS);
 PG_FUNCTION_INFO_V1(my_union);
 
 Datum
@@ -464,7 +462,6 @@ LANGUAGE C STRICT;
         And the matching code in the C module could then follow this skeleton:
 
 <programlisting>
-Datum       my_compress(PG_FUNCTION_ARGS);
 PG_FUNCTION_INFO_V1(my_compress);
 
 Datum
@@ -525,7 +522,6 @@ LANGUAGE C STRICT;
         And the matching code in the C module could then follow this skeleton:
 
 <programlisting>
-Datum       my_decompress(PG_FUNCTION_ARGS);
 PG_FUNCTION_INFO_V1(my_decompress);
 
 Datum
@@ -565,7 +561,6 @@ LANGUAGE C STRICT;  -- in some cases penalty functions need not be strict
         And the matching code in the C module could then follow this skeleton:
 
 <programlisting>
-Datum       my_penalty(PG_FUNCTION_ARGS);
 PG_FUNCTION_INFO_V1(my_penalty);
 
 Datum
@@ -614,7 +609,6 @@ LANGUAGE C STRICT;
         And the matching code in the C module could then follow this skeleton:
 
 <programlisting>
-Datum       my_picksplit(PG_FUNCTION_ARGS);
 PG_FUNCTION_INFO_V1(my_picksplit);
 
 Datum
@@ -721,7 +715,6 @@ LANGUAGE C STRICT;
         And the matching code in the C module could then follow this skeleton:
 
 <programlisting>
-Datum       my_same(PG_FUNCTION_ARGS);
 PG_FUNCTION_INFO_V1(my_same);
 
 Datum
@@ -772,7 +765,6 @@ LANGUAGE C STRICT;
         And the matching code in the C module could then follow this skeleton:
 
 <programlisting>
-Datum       my_distance(PG_FUNCTION_ARGS);
 PG_FUNCTION_INFO_V1(my_distance);
 
 Datum
@@ -859,7 +851,6 @@ LANGUAGE C STRICT;
         The matching code in the C module could then follow this skeleton:
 
 <programlisting>
-Datum       my_fetch(PG_FUNCTION_ARGS);
 PG_FUNCTION_INFO_V1(my_fetch);
 
 Datum

doc/src/sgml/trigger.sgml

@@ -709,11 +709,7 @@ CREATE TABLE ttest (
 #include "commands/trigger.h"   /* ... triggers ... */
 #include "utils/rel.h"          /* ... and relations */
 
-#ifdef PG_MODULE_MAGIC
 PG_MODULE_MAGIC;
-#endif
-
-extern Datum trigf(PG_FUNCTION_ARGS);
 
 PG_FUNCTION_INFO_V1(trigf);
 

src/backend/snowball/dict_snowball.c

@@ -61,10 +61,8 @@
 PG_MODULE_MAGIC;
 
 PG_FUNCTION_INFO_V1(dsnowball_init);
-Datum		dsnowball_init(PG_FUNCTION_ARGS);
 
 PG_FUNCTION_INFO_V1(dsnowball_lexize);
-Datum		dsnowball_lexize(PG_FUNCTION_ARGS);
 
 /* List of supported modules */
 typedef struct stemmer_module

src/backend/utils/mb/conversion_procs/ascii_and_mic/ascii_and_mic.c

@@ -20,9 +20,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(ascii_to_mic);
 PG_FUNCTION_INFO_V1(mic_to_ascii);
 
-extern Datum ascii_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_ascii(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/cyrillic_and_mic/cyrillic_and_mic.c

@@ -40,27 +40,6 @@ PG_FUNCTION_INFO_V1(win1251_to_iso);
 PG_FUNCTION_INFO_V1(iso_to_win866);
 PG_FUNCTION_INFO_V1(win866_to_iso);
 
-extern Datum koi8r_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_koi8r(PG_FUNCTION_ARGS);
-extern Datum iso_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_iso(PG_FUNCTION_ARGS);
-extern Datum win1251_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_win1251(PG_FUNCTION_ARGS);
-extern Datum win866_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_win866(PG_FUNCTION_ARGS);
-extern Datum koi8r_to_win1251(PG_FUNCTION_ARGS);
-extern Datum win1251_to_koi8r(PG_FUNCTION_ARGS);
-extern Datum koi8r_to_win866(PG_FUNCTION_ARGS);
-extern Datum win866_to_koi8r(PG_FUNCTION_ARGS);
-extern Datum win866_to_win1251(PG_FUNCTION_ARGS);
-extern Datum win1251_to_win866(PG_FUNCTION_ARGS);
-extern Datum iso_to_koi8r(PG_FUNCTION_ARGS);
-extern Datum koi8r_to_iso(PG_FUNCTION_ARGS);
-extern Datum iso_to_win1251(PG_FUNCTION_ARGS);
-extern Datum win1251_to_iso(PG_FUNCTION_ARGS);
-extern Datum iso_to_win866(PG_FUNCTION_ARGS);
-extern Datum win866_to_iso(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/euc2004_sjis2004/euc2004_sjis2004.c

@@ -19,9 +19,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(euc_jis_2004_to_shift_jis_2004);
 PG_FUNCTION_INFO_V1(shift_jis_2004_to_euc_jis_2004);
 
-extern Datum euc_jis_2004_to_shift_jis_2004(PG_FUNCTION_ARGS);
-extern Datum shift_jis_2004_to_euc_jis_2004(PG_FUNCTION_ARGS);
-
 static void euc_jis_20042shift_jis_2004(const unsigned char *euc, unsigned char *p, int len);
 static void shift_jis_20042euc_jis_2004(const unsigned char *sjis, unsigned char *p, int len);
 

src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c

@@ -20,9 +20,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(euc_cn_to_mic);
 PG_FUNCTION_INFO_V1(mic_to_euc_cn);
 
-extern Datum euc_cn_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_euc_cn(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/euc_jp_and_sjis/euc_jp_and_sjis.c

@@ -36,13 +36,6 @@ PG_FUNCTION_INFO_V1(mic_to_euc_jp);
 PG_FUNCTION_INFO_V1(sjis_to_mic);
 PG_FUNCTION_INFO_V1(mic_to_sjis);
 
-extern Datum euc_jp_to_sjis(PG_FUNCTION_ARGS);
-extern Datum sjis_to_euc_jp(PG_FUNCTION_ARGS);
-extern Datum euc_jp_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_euc_jp(PG_FUNCTION_ARGS);
-extern Datum sjis_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_sjis(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/euc_kr_and_mic/euc_kr_and_mic.c

@@ -20,9 +20,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(euc_kr_to_mic);
 PG_FUNCTION_INFO_V1(mic_to_euc_kr);
 
-extern Datum euc_kr_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_euc_kr(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/euc_tw_and_big5/euc_tw_and_big5.c

@@ -26,13 +26,6 @@ PG_FUNCTION_INFO_V1(mic_to_euc_tw);
 PG_FUNCTION_INFO_V1(big5_to_mic);
 PG_FUNCTION_INFO_V1(mic_to_big5);
 
-extern Datum euc_tw_to_big5(PG_FUNCTION_ARGS);
-extern Datum big5_to_euc_tw(PG_FUNCTION_ARGS);
-extern Datum euc_tw_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_euc_tw(PG_FUNCTION_ARGS);
-extern Datum big5_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_big5(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/latin2_and_win1250/latin2_and_win1250.c

@@ -26,13 +26,6 @@ PG_FUNCTION_INFO_V1(mic_to_win1250);
 PG_FUNCTION_INFO_V1(latin2_to_win1250);
 PG_FUNCTION_INFO_V1(win1250_to_latin2);
 
-extern Datum latin2_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_latin2(PG_FUNCTION_ARGS);
-extern Datum win1250_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_win1250(PG_FUNCTION_ARGS);
-extern Datum latin2_to_win1250(PG_FUNCTION_ARGS);
-extern Datum win1250_to_latin2(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/latin_and_mic/latin_and_mic.c

@@ -24,13 +24,6 @@ PG_FUNCTION_INFO_V1(mic_to_latin3);
 PG_FUNCTION_INFO_V1(latin4_to_mic);
 PG_FUNCTION_INFO_V1(mic_to_latin4);
 
-extern Datum latin1_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_latin1(PG_FUNCTION_ARGS);
-extern Datum latin3_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_latin3(PG_FUNCTION_ARGS);
-extern Datum latin4_to_mic(PG_FUNCTION_ARGS);
-extern Datum mic_to_latin4(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_ascii/utf8_and_ascii.c

@@ -20,9 +20,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(ascii_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_ascii);
 
-extern Datum ascii_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_ascii(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_big5/utf8_and_big5.c

@@ -22,9 +22,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(big5_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_big5);
 
-extern Datum big5_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_big5(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_cyrillic/utf8_and_cyrillic.c

@@ -27,12 +27,6 @@ PG_FUNCTION_INFO_V1(koi8r_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_koi8u);
 PG_FUNCTION_INFO_V1(koi8u_to_utf8);
 
-extern Datum utf8_to_koi8r(PG_FUNCTION_ARGS);
-extern Datum koi8r_to_utf8(PG_FUNCTION_ARGS);
-
-extern Datum utf8_to_koi8u(PG_FUNCTION_ARGS);
-extern Datum koi8u_to_utf8(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_euc2004/utf8_and_euc2004.c

@@ -24,9 +24,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(euc_jis_2004_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_euc_jis_2004);
 
-extern Datum euc_jis_2004_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_euc_jis_2004(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_euc_cn/utf8_and_euc_cn.c

@@ -22,9 +22,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(euc_cn_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_euc_cn);
 
-extern Datum euc_cn_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_euc_cn(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_euc_jp/utf8_and_euc_jp.c

@@ -22,9 +22,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(euc_jp_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_euc_jp);
 
-extern Datum euc_jp_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_euc_jp(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_euc_kr/utf8_and_euc_kr.c

@@ -22,9 +22,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(euc_kr_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_euc_kr);
 
-extern Datum euc_kr_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_euc_kr(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_euc_tw/utf8_and_euc_tw.c

@@ -22,9 +22,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(euc_tw_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_euc_tw);
 
-extern Datum euc_tw_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_euc_tw(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_gb18030/utf8_and_gb18030.c

@@ -22,9 +22,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(gb18030_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_gb18030);
 
-extern Datum gb18030_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_gb18030(PG_FUNCTION_ARGS);
-
 /*
  * Convert 4-byte GB18030 characters to and from a linear code space
  *

src/backend/utils/mb/conversion_procs/utf8_and_gbk/utf8_and_gbk.c

@@ -22,9 +22,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(gbk_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_gbk);
 
-extern Datum gbk_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_gbk(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_iso8859/utf8_and_iso8859.c

@@ -46,9 +46,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(iso8859_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_iso8859);
 
-extern Datum iso8859_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_iso8859(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_iso8859_1/utf8_and_iso8859_1.c

@@ -20,9 +20,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(iso8859_1_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_iso8859_1);
 
-extern Datum iso8859_1_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_iso8859_1(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_johab/utf8_and_johab.c

@@ -22,9 +22,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(johab_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_johab);
 
-extern Datum johab_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_johab(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_sjis/utf8_and_sjis.c

@@ -22,9 +22,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(sjis_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_sjis);
 
-extern Datum sjis_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_sjis(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_sjis2004/utf8_and_sjis2004.c

@@ -24,9 +24,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(shift_jis_2004_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_shift_jis_2004);
 
-extern Datum shift_jis_2004_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_shift_jis_2004(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_uhc/utf8_and_uhc.c

@@ -22,9 +22,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(uhc_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_uhc);
 
-extern Datum uhc_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_uhc(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/backend/utils/mb/conversion_procs/utf8_and_win/utf8_and_win.c

@@ -42,9 +42,6 @@ PG_MODULE_MAGIC;
 PG_FUNCTION_INFO_V1(win_to_utf8);
 PG_FUNCTION_INFO_V1(utf8_to_win);
 
-extern Datum win_to_utf8(PG_FUNCTION_ARGS);
-extern Datum utf8_to_win(PG_FUNCTION_ARGS);
-
 /* ----------
  * conv_proc(
  *		INTEGER,	-- source encoding id

src/include/utils/jsonb.h

@@ -401,9 +401,9 @@ extern Datum jsonb_pretty(PG_FUNCTION_ARGS);
 extern Datum jsonb_concat(PG_FUNCTION_ARGS);
 
 /* deletion */
-Datum		jsonb_delete(PG_FUNCTION_ARGS);
-Datum		jsonb_delete_idx(PG_FUNCTION_ARGS);
-Datum		jsonb_delete_path(PG_FUNCTION_ARGS);
+extern Datum jsonb_delete(PG_FUNCTION_ARGS);
+extern Datum jsonb_delete_idx(PG_FUNCTION_ARGS);
+extern Datum jsonb_delete_path(PG_FUNCTION_ARGS);
 
 /* replacement */
 extern Datum jsonb_replace(PG_FUNCTION_ARGS);

src/tutorial/complex.c

@@ -20,23 +20,6 @@ typedef struct Complex
 	double		y;
 }	Complex;
 
-/*
- * Since we use V1 function calling convention, all these functions have
- * the same signature as far as C is concerned.  We provide these prototypes
- * just to forestall warnings when compiled with gcc -Wmissing-prototypes.
- */
-Datum		complex_in(PG_FUNCTION_ARGS);
-Datum		complex_out(PG_FUNCTION_ARGS);
-Datum		complex_recv(PG_FUNCTION_ARGS);
-Datum		complex_send(PG_FUNCTION_ARGS);
-Datum		complex_add(PG_FUNCTION_ARGS);
-Datum		complex_abs_lt(PG_FUNCTION_ARGS);
-Datum		complex_abs_le(PG_FUNCTION_ARGS);
-Datum		complex_abs_eq(PG_FUNCTION_ARGS);
-Datum		complex_abs_ge(PG_FUNCTION_ARGS);
-Datum		complex_abs_gt(PG_FUNCTION_ARGS);
-Datum		complex_abs_cmp(PG_FUNCTION_ARGS);
-
 
 /*****************************************************************************
  * Input/Output functions

src/tutorial/funcs_new.c

@@ -18,15 +18,6 @@
 
 PG_MODULE_MAGIC;
 
-/* These prototypes just prevent possible warnings from gcc. */
-
-Datum		add_one(PG_FUNCTION_ARGS);
-Datum		add_one_float8(PG_FUNCTION_ARGS);
-Datum		makepoint(PG_FUNCTION_ARGS);
-Datum		copytext(PG_FUNCTION_ARGS);
-Datum		concat_text(PG_FUNCTION_ARGS);
-Datum		c_overpaid(PG_FUNCTION_ARGS);
-
 
 /* By Value */