52750: remove ansi2knr support for old pre-ansi K&R compilers

27 files changed, 144 insertions, 239 deletions

diff --git a/ChangeLog b/ChangeLog
index 7e5f68059..290b1f1b2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2024-03-18  Oliver Kiddle  <opk@zsh.org>
+
+	* 52750: Config/defs.mk.in, Etc/zsh-development-guide,
+	Src/Makemod.in.in, Src/Modules/files.c, Src/Modules/watch.c,
+	Src/Modules/zftp.c, Src/Modules/zprof.c, Src/Zle/compcore.c,
+	Src/Zle/zle.h, Src/Zle/zle_keymap.c, Src/Zle/zle_thingy.c,
+	Src/exec.c, Src/glob.c, Src/hist.c, Src/makepro.awk, Src/mem.c,
+	Src/mkbltnmlst.sh, Src/modentry.c, Src/parse.c, Src/prototypes.h,
+	Src/signals.h, Src/utils.c, Src/zsh.h, Src/zsh_system.h, aclocal.m4,
+	configure.ac: remove ansi2knr support for old pre-ansi K&R compilers
+
 2024-03-14  Bart Schaefer  <schaefer@zsh.org>
 
 	* 52759: Doc/Zsh/expn.yo, Etc/FAQ.yo, Src/subst.c,
diff --git a/Config/defs.mk.in b/Config/defs.mk.in
index 2bc17482a..116875fb9 100644
--- a/Config/defs.mk.in
+++ b/Config/defs.mk.in
@@ -75,7 +75,6 @@ IMPOPT          = @IMPOPT@
 
 # utilities
 AWK             = @AWK@
-ANSI2KNR        = @ANSI2KNR@
 YODL            = @YODL@ @YODL_OPTIONS@
 YODL2TXT        = @YODL@2txt
 YODL2HTML       = @YODL@2html
@@ -100,7 +99,7 @@ LDFLAGS='$(LDFLAGS)' EXTRA_LDFLAGS='$(EXTRA_LDFLAGS)' \
 DLCFLAGS='$(DLCFLAGS)' DLLDFLAGS='$(DLLDFLAGS)' \
 LIBLDFLAGS='$(LIBLDFLAGS)' EXELDFLAGS='$(EXELDFLAGS)' \
 LIBS='$(LIBS)' DL_EXT='$(DL_EXT)' DLLD='$(DLLD)' \
-AWK='$(AWK)' ANSI2KNR='$(ANSI2KNR)' \
+AWK='$(AWK)' \
 YODL='$(YODL)' YODL2TXT='$(YODL2TXT)' YODL2HTML='$(YODL2HTML)' \
 FUNCTIONS_INSTALL='$(FUNCTIONS_INSTALL)' tzsh='$(tzsh)'
 
diff --git a/Etc/zsh-development-guide b/Etc/zsh-development-guide
index 5cb542709..bdabe17d8 100644
--- a/Etc/zsh-development-guide
+++ b/Etc/zsh-development-guide
@@ -240,7 +240,7 @@ C coding style
   There must be an empty line, a line with "/**/", a line with the
   type of the function, and finally the name of the function with typed
   arguments.  These lines must not be indented.  The script generating
-  function prototypes and the ansi2knr program depend on this format.
+  function prototypes depends on this format.
 
 * Variable declarations must similarly be preceded by a
   line containing only "/**/", for the prototype generation script.
diff --git a/Src/Makemod.in.in b/Src/Makemod.in.in
index ea0cdc3a4..3343ae1d0 100644
--- a/Src/Makemod.in.in
+++ b/Src/Makemod.in.in
@@ -52,32 +52,17 @@ DLCOMPILE   = $(CC) -c -I. -I$(dir_top)/Src -I$(sdir_top)/Src -I$(sdir_top)/Src/
 LINK        = $(CC) $(LDFLAGS) $(EXELDFLAGS) $(EXTRA_LDFLAGS) -o $@
 DLLINK      = $(DLLD) $(LDFLAGS) $(LIBLDFLAGS) $(DLLDFLAGS) -o $@
 
-KNR_OBJ=.o
-KNROBJ=._foo_
+OBJ=.o
 
-ANSIOBJ=.o
-ANSI_OBJ=._foo_
+.SUFFIXES: .c .$(DL_EXT) ..o .o .syms .pro .epro
 
-.SUFFIXES: .c .$(DL_EXT) ..o .._foo_ .o ._foo_ .syms .pro .epro
-
-.c$(ANSI@U@OBJ):
+.c$(OBJ):
 	$(COMPILE) -o $@ $<
 	@rm -f $(dir_src)/stamp-modobjs
 
-.c$(KNR@U@OBJ):
-	@ANSI2KNR@ $< > $@.c
-	$(COMPILE) -o $@ $@.c
-	rm -f $@.c
-	@rm -f $(dir_src)/stamp-modobjs
-
-.c.$(ANSI@U@OBJ):
+.c.$(OBJ):
 	$(DLCOMPILE) -o $@ $<
 
-.c.$(KNR@U@OBJ):
-	@ANSI2KNR@ $< > $@.c
-	$(DLCOMPILE) -o $@ $@.c
-	rm -f $@.c
-
 .c.syms:
 	$(AWK) -f $(sdir_src)/makepro.awk $< $(subdir) > $@
 
diff --git a/Src/Modules/files.c b/Src/Modules/files.c
index bf0e8f8a8..a3fec1daa 100644
--- a/Src/Modules/files.c
+++ b/Src/Modules/files.c
@@ -29,8 +29,8 @@
 
 #include "files.mdh"
 
-typedef int (*MoveFunc) _((char const *, char const *));
-typedef int (*RecurseFunc) _((char *, char *, struct stat const *, void *));
+typedef int (*MoveFunc) (char const *, char const *);
+typedef int (*RecurseFunc) (char *, char *, struct stat const *, void *);
 
 struct recursivecmd;
 
diff --git a/Src/Modules/watch.c b/Src/Modules/watch.c
index ba17cf940..acc499518 100644
--- a/Src/Modules/watch.c
+++ b/Src/Modules/watch.c
@@ -584,7 +584,7 @@ readwtab(WATCH_STRUCT_UTMP **head, int initial_sz)
 
     if (sz)
 	qsort((void *) *head, sz, sizeof(WATCH_STRUCT_UTMP),
-	           (int (*) _((const void *, const void *)))ucmp);
+	           (int (*) (const void *, const void *))ucmp);
     return sz;
 }
 
diff --git a/Src/Modules/zftp.c b/Src/Modules/zftp.c
index 47a5e9de9..0c26828fd 100644
--- a/Src/Modules/zftp.c
+++ b/Src/Modules/zftp.c
@@ -127,7 +127,7 @@ typedef int (*readwrite_t)(int, char *, off_t, int);
 
 struct zftpcmd {
     const char *nam;
-    int (*fun) _((char *, char **, int));
+    int (*fun) (char *, char **, int);
     int min, max, flags;
 };
 
diff --git a/Src/Modules/zprof.c b/Src/Modules/zprof.c
index 56cdab888..171a15b90 100644
--- a/Src/Modules/zprof.c
+++ b/Src/Modules/zprof.c
@@ -163,9 +163,9 @@ bin_zprof(UNUSED(char *nam), UNUSED(char **args), Options ops, UNUSED(int func))
 	*ap = NULL;
 
 	qsort(fs, ncalls, sizeof(f),
-	      (int (*) _((const void *, const void *))) cmpsfuncs);
+	      (int (*) (const void *, const void *)) cmpsfuncs);
 	qsort(as, narcs, sizeof(a),
-	      (int (*) _((const void *, const void *))) cmpparcs);
+	      (int (*) (const void *, const void *)) cmpparcs);
 
 	printf("num  calls                time                       self            name\n-----------------------------------------------------------------------------------\n");
 	for (fp = fs, i = 1; *fp; fp++, i++) {
@@ -179,7 +179,7 @@ bin_zprof(UNUSED(char *nam), UNUSED(char **args), Options ops, UNUSED(int func))
 		   (*fp)->name);
 	}
 	qsort(fs, ncalls, sizeof(f),
-	      (int (*) _((const void *, const void *))) cmptfuncs);
+	      (int (*) (const void *, const void *)) cmptfuncs);
 
 	for (fp = fs; *fp; fp++) {
 	    printf("\n-----------------------------------------------------------------------------------\n\n");
diff --git a/Src/Zle/compcore.c b/Src/Zle/compcore.c
index 9b87cad93..09282d42d 100644
--- a/Src/Zle/compcore.c
+++ b/Src/Zle/compcore.c
@@ -3253,7 +3253,7 @@ makearray(LinkList l, int type, int flags, int *np, int *nlp, int *llp)
 	    /* Now sort the array (it contains matches). */
 	    matchorder = flags;
 	    qsort((void *) rp, n, sizeof(Cmatch),
-		  (int (*) _((const void *, const void *)))matchcmp);
+		  (int (*) (const void *, const void *))matchcmp);
 
 	    /* since the matches are sorted and the default is to remove
 	     * all duplicates, -1 (remove only consecutive dupes) is a no-op,
@@ -3295,7 +3295,7 @@ makearray(LinkList l, int type, int flags, int *np, int *nlp, int *llp)
 		sp = (Cmatch *) zhalloc((n + 1) * sizeof(Cmatch));
 		memcpy(sp, rp, (n + 1) * sizeof(Cmatch));
 		qsort((void *) sp, n, sizeof(Cmatch),
-		      (int (*) _((const void *, const void *)))matchcmp);
+		      (int (*) (const void *, const void *))matchcmp);
 		for (asp = sp + 1; *asp; asp++) {
 		    Cmatch *ap = asp - 1, *bp = asp;
 		    if (matcheq(*ap, *bp)) {
diff --git a/Src/Zle/zle.h b/Src/Zle/zle.h
index 010ead3d2..5bb9e7a5e 100644
--- a/Src/Zle/zle.h
+++ b/Src/Zle/zle.h
@@ -186,7 +186,7 @@ typedef struct thingy *Thingy;
 
 /* widgets (ZLE functions) */
 
-typedef int (*ZleIntFunc) _((char **));
+typedef int (*ZleIntFunc) (char **);
 
 struct widget {
     int flags;		/* flags (see below) */
@@ -319,7 +319,7 @@ struct vichange {
 
 typedef struct keymap *Keymap;
 
-typedef void (*KeyScanFunc) _((char *, Thingy, char *, void *));
+typedef void (*KeyScanFunc) (char *, Thingy, char *, void *);
 
 #define invicmdmode() (!strcmp(curkeymapname, "vicmd"))
 
diff --git a/Src/Zle/zle_keymap.c b/Src/Zle/zle_keymap.c
index 041682ee9..5012917f5 100644
--- a/Src/Zle/zle_keymap.c
+++ b/Src/Zle/zle_keymap.c
@@ -745,7 +745,7 @@ bin_bindkey(char *name, char **argv, Options ops, UNUSED(int func))
     static struct opn {
 	char o;
 	char selp;
-	int (*func) _((char *, char *, Keymap, char **, Options, char));
+	int (*func) (char *, char *, Keymap, char **, Options, char);
 	int min, max;
     } const opns[] = {
 	{ 'l', 0, bin_bindkey_lsmaps, 0,  -1 },
diff --git a/Src/Zle/zle_thingy.c b/Src/Zle/zle_thingy.c
index 1b036a8a0..f71435b01 100644
--- a/Src/Zle/zle_thingy.c
+++ b/Src/Zle/zle_thingy.c
@@ -344,7 +344,7 @@ bin_zle(char *name, char **args, Options ops, UNUSED(int func))
 {
     static struct opn {
 	char o;
-	int (*func) _((char *, char **, Options, char));
+	int (*func) (char *, char **, Options, char);
 	int min, max;
     } const opns[] = {
 	{ 'l', bin_zle_list, 0, -1 },
diff --git a/Src/exec.c b/Src/exec.c
index 0231bc361..e955e85df 100644
--- a/Src/exec.c
+++ b/Src/exec.c
@@ -267,7 +267,7 @@ static char *blank_env[] = { NULL };
 
 /* Execution functions. */
 
-static int (*execfuncs[WC_COUNT-WC_CURSH]) _((Estate, int)) = {
+static int (*execfuncs[WC_COUNT-WC_CURSH]) (Estate, int) = {
     execcursh, exectime, NULL /* execfuncdef handled specially */,
     execfor, execselect,
     execwhile, execrepeat, execcase, execif, execcond,
diff --git a/Src/glob.c b/Src/glob.c
index bd199ace3..3e34f708e 100644
--- a/Src/glob.c
+++ b/Src/glob.c
@@ -133,7 +133,7 @@ typedef struct stat *Statptr;	 /* This makes the Ultrix compiler happy.  Go figu
 #define TT_TERABYTES 5
 
 
-typedef int (*TestMatchFunc) _((char *, struct stat *, off_t, char *));
+typedef int (*TestMatchFunc) (char *, struct stat *, off_t, char *);
 
 struct qual {
     struct qual *next;		/* Next qualifier, must match                */
@@ -1264,7 +1264,7 @@ zglob(LinkList list, LinkNode np, int nountok)
 	int sense, qualsfound;
 	off_t data;
 	char *sdata, *newcolonmod, *ptr;
-	int (*func) _((char *, Statptr, off_t, char *));
+	int (*func) (char *, Statptr, off_t, char *);
 
 	/*
 	 * Initialise state variables for current file pattern.
@@ -1310,7 +1310,7 @@ zglob(LinkList list, LinkNode np, int nountok)
 	    if (*ptr == Dash)
 		*ptr = '-';
 	while (*s && !newcolonmod) {
-	    func = (int (*) _((char *, Statptr, off_t, char *)))0;
+	    func = (int (*) (char *, Statptr, off_t, char *)) 0;
 	    if (*s == ',') {
 		/* A comma separates alternative sets of qualifiers */
 		s++;
@@ -1961,7 +1961,7 @@ zglob(LinkList list, LinkNode np, int nountok)
 	/* Sort arguments in to lexical (and possibly numeric) order. *
 	 * This is reversed to facilitate insertion into the list.    */
 	qsort((void *) & matchbuf[0], matchct, sizeof(struct gmatch),
-	      (int (*) _((const void *, const void *)))gmatchcmp);
+	      (int (*) (const void *, const void *)) gmatchcmp);
     }
 
     if (first < 0) {
diff --git a/Src/hist.c b/Src/hist.c
index 448dfddbc..1a00c30ed 100644
--- a/Src/hist.c
+++ b/Src/hist.c
@@ -34,25 +34,25 @@
  * word control. */
 
 /**/
-mod_export int (*hgetc) _((void));
+mod_export int (*hgetc) (void);
 
 /**/
-void (*hungetc) _((int));
+void (*hungetc) (int);
 
 /**/
-void (*hwaddc) _((int));
+void (*hwaddc) (int);
 
 /**/
-void (*hwbegin) _((int));
+void (*hwbegin) (int);
 
 /**/
-void (*hwabort) _((void));
+void (*hwabort) (void);
 
 /**/
-void (*hwend) _((void));
+void (*hwend) (void);
 
 /**/
-void (*addtoline) _((int));
+void (*addtoline) (int);
 
 /* != 0 means history substitution is turned off */
  
diff --git a/Src/makepro.awk b/Src/makepro.awk
index 0d53c5850..56c4f4595 100644
--- a/Src/makepro.awk
+++ b/Src/makepro.awk
@@ -131,8 +131,8 @@ BEGIN {
 		sub(/@-.*$/, "", dnam)
 
 		# Put parens etc. back
-		gsub(/@[{]/, " _((", dcltor)
-		gsub(/@}/, "))", dcltor)
+		gsub(/@[{]/, " (", dcltor)
+		gsub(/@}/, ")", dcltor)
 		gsub(/@</, "(", dcltor)
 		gsub(/@>/, ")", dcltor)
 		gsub(/@!/, ",", dcltor)
diff --git a/Src/mem.c b/Src/mem.c
index fb4be47bf..0b6f76e46 100644
--- a/Src/mem.c
+++ b/Src/mem.c
@@ -1057,17 +1057,17 @@ zrealloc(void *ptr, size_t size)
 #if !defined(__hpux) && !defined(DGUX) && !defined(__osf__)
 # if defined(_BSD)
 #  ifndef HAVE_BRK_PROTO
-   extern int brk _((caddr_t));
+   extern int brk (caddr_t);
 #  endif
 #  ifndef HAVE_SBRK_PROTO
-   extern caddr_t sbrk _((int));
+   extern caddr_t sbrk (int);
 #  endif
 # else
 #  ifndef HAVE_BRK_PROTO
-   extern int brk _((void *));
+   extern int brk (void *);
 #  endif
 #  ifndef HAVE_SBRK_PROTO
-   extern void *sbrk _((int));
+   extern void *sbrk (int);
 #  endif
 # endif
 #endif
diff --git a/Src/mkbltnmlst.sh b/Src/mkbltnmlst.sh
index 067ecdaf9..1994ace60 100644
--- a/Src/mkbltnmlst.sh
+++ b/Src/mkbltnmlst.sh
@@ -122,12 +122,12 @@ for bin_mod in $bin_mods; do
 	esac
     done
     echo "    {"
-    echo "        extern int setup_${q_bin_mod} _((Module));"
-    echo "        extern int boot_${q_bin_mod} _((Module));"
-    echo "        extern int features_${q_bin_mod} _((Module,char***));"
-    echo "        extern int enables_${q_bin_mod} _((Module,int**));"
-    echo "        extern int cleanup_${q_bin_mod} _((Module));"
-    echo "        extern int finish_${q_bin_mod} _((Module));"
+    echo "        extern int setup_${q_bin_mod} (Module);"
+    echo "        extern int boot_${q_bin_mod} (Module);"
+    echo "        extern int features_${q_bin_mod} (Module,char***);"
+    echo "        extern int enables_${q_bin_mod} (Module,int**);"
+    echo "        extern int cleanup_${q_bin_mod} (Module);"
+    echo "        extern int finish_${q_bin_mod} (Module);"
     echo
     echo "        register_module(\"$bin_mod\","
     echo "                        setup_${q_bin_mod},"
diff --git a/Src/modentry.c b/Src/modentry.c
index 4d8217f43..23c499d94 100644
--- a/Src/modentry.c
+++ b/Src/modentry.c
@@ -1,10 +1,10 @@
 #include "zsh.mdh"
 
-int setup_ _((Module));
-int boot_ _((Module));
-int cleanup_ _((Module));
-int finish_ _((Module));
-int modentry _((int boot, Module m, void *ptr));
+int setup_ (Module);
+int boot_ (Module);
+int cleanup_ (Module);
+int finish_ (Module);
+int modentry (int boot, Module m, void *ptr);
 
 /**/
 int
diff --git a/Src/parse.c b/Src/parse.c
index 40eb0ee0b..334365649 100644
--- a/Src/parse.c
+++ b/Src/parse.c
@@ -2392,7 +2392,7 @@ par_nl_wordlist(void)
  */
 
 /**/
-void (*condlex) _((void)) = zshlex;
+void (*condlex) (void) = zshlex;
 
 /*
  * cond	: cond_1 { SEPER } [ DBAR { SEPER } cond ]
diff --git a/Src/prototypes.h b/Src/prototypes.h
index e3db4f5ee..3578482d0 100644
--- a/Src/prototypes.h
+++ b/Src/prototypes.h
@@ -28,9 +28,9 @@
  */
 
 #ifndef HAVE_STDLIB_H
-char *malloc _((size_t));
-char *realloc _((void *, size_t));
-char *calloc _((size_t, size_t));
+char *malloc (size_t);
+char *realloc (void *, size_t);
+char *calloc (size_t, size_t);
 #endif
 
 #if !(defined(USES_TERMCAP_H) || defined(USES_TERM_H))
@@ -45,11 +45,11 @@ char *calloc _((size_t, size_t));
 #else
 #define TC_CONST
 #endif
-extern int tgetent _((char *bp, TC_CONST char *name));
-extern int tgetnum _((char *id));
-extern int tgetflag _((char *id));
-extern char *tgetstr _((char *id, char **area));
-extern int tputs _((TC_CONST char *cp, int affcnt, int (*outc) (int)));
+extern int tgetent (char *bp, TC_CONST char *name);
+extern int tgetnum (char *id);
+extern int tgetflag (char *id);
+extern char *tgetstr (char *id, char **area);
+extern int tputs (TC_CONST char *cp, int affcnt, int (*outc) (int));
 #undef TC_CONST
 #endif
 
@@ -70,30 +70,30 @@ char *tgoto(const char *cap, int col, int row);
 #endif
 
 #ifdef __osf__
-char *mktemp _((char *));
+char *mktemp (char *);
 #endif
 
 #if defined(__osf__) && defined(__alpha) && defined(__GNUC__)
 /* Digital cc does not need these prototypes, gcc does need them */
 # ifndef HAVE_IOCTL_PROTO
-int ioctl _((int d, unsigned long request, void *argp));
+int ioctl (int d, unsigned long request, void *argp);
 # endif
 # ifndef HAVE_MKNOD_PROTO
-int mknod _((const char *pathname, int mode, dev_t device));
+int mknod (const char *pathname, int mode, dev_t device);
 # endif
-int nice _((int increment));
-int select _((int nfds, fd_set * readfds, fd_set * writefds, fd_set * exceptfds, struct timeval *timeout));
+int nice (int increment);
+int select (int nfds, fd_set * readfds, fd_set * writefds, fd_set * exceptfds, struct timeval *timeout);
 #endif
 
 #if defined(DGUX) && defined(__STDC__)
 /* Just plain missing. */
-extern int getrlimit _((int resource, struct rlimit *rlp));
-extern int setrlimit _((int resource, const struct rlimit *rlp));
-extern int getrusage _((int who, struct rusage *rusage));
-extern int gettimeofday _((struct timeval *tv, struct timezone *tz));
-extern int wait3 _((union wait *wait_status, int options, struct rusage *rusage));
-extern int getdomainname _((char *name, int maxlength));
-extern int select _((int nfds, fd_set * readfds, fd_set * writefds, fd_set * exceptfds, struct timeval *timeout));
+extern int getrlimit (int resource, struct rlimit *rlp);
+extern int setrlimit (int resource, const struct rlimit *rlp);
+extern int getrusage (int who, struct rusage *rusage);
+extern int gettimeofday (struct timeval *tv, struct timezone *tz);
+extern int wait3 (union wait *wait_status, int options, struct rusage *rusage);
+extern int getdomainname (char *name, int maxlength);
+extern int select (int nfds, fd_set * readfds, fd_set * writefds, fd_set * exceptfds, struct timeval *timeout);
 #endif /* DGUX and __STDC__ */
 
 #ifdef __NeXT__
@@ -101,34 +101,34 @@ extern pid_t getppid(void);
 #endif
 
 #if defined(__sun__) && !defined(__SVR4)  /* SunOS */
-extern char *strerror _((int errnum));
+extern char *strerror (int errnum);
 #endif
 
 /**************************************************/
 /*** prototypes for functions built in compat.c ***/
 #ifndef HAVE_STRSTR
-extern char *strstr _((const char *s, const char *t));
+extern char *strstr (const char *s, const char *t);
 #endif
 
 #ifndef HAVE_GETHOSTNAME
-extern int gethostname _((char *name, size_t namelen));
+extern int gethostname (char *name, size_t namelen);
 #endif
 
 #ifndef HAVE_GETTIMEOFDAY
-extern int gettimeofday _((struct timeval *tv, struct timezone *tz));
+extern int gettimeofday (struct timeval *tv, struct timezone *tz);
 #endif
 
 #ifndef HAVE_DIFFTIME
-extern double difftime _((time_t t2, time_t t1));
+extern double difftime (time_t t2, time_t t1);
 #endif
 
 #ifndef HAVE_STRERROR
-extern char *strerror _((int errnum));
+extern char *strerror (int errnum);
 #endif
 
 /*** end of prototypes for functions in compat.c ***/
 /***************************************************/
 
 #ifndef HAVE_MEMMOVE
-extern void bcopy _((const void *, void *, size_t));
+extern void bcopy (const void *, void *, size_t);
 #endif
diff --git a/Src/signals.h b/Src/signals.h
index 391f11fed..7910f6b79 100644
--- a/Src/signals.h
+++ b/Src/signals.h
@@ -27,7 +27,7 @@
  *
  */
 
-#define SIGNAL_HANDTYPE void (*)_((int))
+#define SIGNAL_HANDTYPE void (*)(int)
 
 #ifndef HAVE_KILLPG
 # define killpg(pgrp,sig) kill(-(pgrp),sig)
@@ -145,7 +145,7 @@
 #ifdef BSD_SIGNALS
 #define signal_block(S) sigblock(S)
 #else
-extern sigset_t signal_block _((sigset_t));
+extern sigset_t signal_block (sigset_t);
 #endif  /* BSD_SIGNALS   */
 
-extern sigset_t signal_unblock _((sigset_t));
+extern sigset_t signal_unblock (sigset_t);
diff --git a/Src/utils.c b/Src/utils.c
index c8831c85e..ce4e875fd 100644
--- a/Src/utils.c
+++ b/Src/utils.c
@@ -5277,6 +5277,7 @@ nicedupstring(char const *s)
 }
 
 
+/**/
 #ifndef MULTIBYTE_SUPPORT
 /* Unmetafy and output a string, displaying special characters readably. */
 
@@ -5311,8 +5312,9 @@ niceztrlen(char const *s)
     }
     return l;
 }
-#endif
 
+/**/
+#endif
 
 /**/
 #ifdef MULTIBYTE_SUPPORT
@@ -7633,6 +7635,7 @@ mode_to_octal(mode_t mode)
     return m;
 }
 
+/**/
 #ifdef MAILDIR_SUPPORT
 /*
  *     Stat a file. If it's a maildir, check all messages
@@ -7756,4 +7759,6 @@ mailstat(char *path, struct stat *st)
        *st = st_ret_last = st_ret;
        return 0;
 }
+
+/**/
 #endif
diff --git a/Src/zsh.h b/Src/zsh.h
index fae62b8d0..090abf8f5 100644
--- a/Src/zsh.h
+++ b/Src/zsh.h
@@ -618,7 +618,7 @@ union linkroot {
 /* Specific elements of linked lists */
 /*************************************/
 
-typedef void (*voidvoidfnptr_t) _((void));
+typedef void (*voidvoidfnptr_t) (void);
 
 /*
  * Element of the prepromptfns list.
@@ -678,7 +678,7 @@ struct timedfn {
 #define COND_MOD   18
 #define COND_MODI  19
 
-typedef int (*CondHandler) _((char **, int));
+typedef int (*CondHandler) (char **, int);
 
 struct conddef {
     Conddef next;		/* next in list                       */
@@ -1164,28 +1164,28 @@ struct dirsav {
 /* Definitions for Hash Tables */
 /*******************************/
 
-typedef void *(*VFunc) _((void *));
-typedef void (*FreeFunc) _((void *));
+typedef void *(*VFunc) (void *);
+typedef void (*FreeFunc) (void *);
 
-typedef unsigned (*HashFunc)       _((const char *));
-typedef void     (*TableFunc)      _((HashTable));
+typedef unsigned (*HashFunc)       (const char *);
+typedef void     (*TableFunc)      (HashTable);
 /*
  * Note that this is deliberately "char *", not "const char *",
  * since the AddNodeFunc is passed a pointer to a string that
  * will be stored and later freed.
  */
-typedef void     (*AddNodeFunc)    _((HashTable, char *, void *));
-typedef HashNode (*GetNodeFunc)    _((HashTable, const char *));
-typedef HashNode (*RemoveNodeFunc) _((HashTable, const char *));
-typedef void     (*FreeNodeFunc)   _((HashNode));
-typedef int      (*CompareFunc)    _((const char *, const char *));
+typedef void     (*AddNodeFunc)    (HashTable, char *, void *);
+typedef HashNode (*GetNodeFunc)    (HashTable, const char *);
+typedef HashNode (*RemoveNodeFunc) (HashTable, const char *);
+typedef void     (*FreeNodeFunc)   (HashNode);
+typedef int      (*CompareFunc)    (const char *, const char *);
 
 /* type of function that is passed to *
  * scanhashtable or scanmatchtable    */
-typedef void     (*ScanFunc)       _((HashNode, int));
-typedef void     (*ScanTabFunc)    _((HashTable, ScanFunc, int));
+typedef void     (*ScanFunc)       (HashNode, int);
+typedef void     (*ScanTabFunc)    (HashTable, ScanFunc, int);
 
-typedef void (*PrintTableStats) _((HashTable));
+typedef void (*PrintTableStats) (HashTable);
 
 /* Hash table for standard open hashing. Instances of struct hashtable can be *
  * created only by newhashtable(). In fact, this function creates an instance *
@@ -1352,7 +1352,7 @@ struct funcstack {
 
 /* node in list of function call wrappers */
 
-typedef int (*WrapFunc) _((Eprog, FuncWrap, char *));
+typedef int (*WrapFunc) (Eprog, FuncWrap, char *);
 
 struct funcwrap {
     FuncWrap next;
@@ -1428,8 +1428,8 @@ enum {
  * builtin structure.
  */
 
-typedef int (*HandlerFunc) _((char *, char **, Options, int));
-typedef int (*HandlerFuncAssign) _((char *, char **, LinkList, Options, int));
+typedef int (*HandlerFunc) (char *, char **, Options, int);
+typedef int (*HandlerFuncAssign) (char *, char **, LinkList, Options, int);
 #define NULLBINCMD ((HandlerFunc) 0)
 
 struct builtin {
@@ -1526,10 +1526,10 @@ struct module {
 /* Module record is an alias */
 #define MOD_ALIAS   (1<<6)
 
-typedef int (*Module_generic_func) _((void));
-typedef int (*Module_void_func) _((Module));
-typedef int (*Module_features_func) _((Module, char ***));
-typedef int (*Module_enables_func) _((Module, int **));
+typedef int (*Module_generic_func) (void);
+typedef int (*Module_void_func) (Module);
+typedef int (*Module_features_func) (Module, char ***);
+typedef int (*Module_enables_func) (Module, int **);
 
 struct linkedmod {
     char *name;
@@ -1574,7 +1574,7 @@ struct feature_enables {
 
 /* C-function hooks */
 
-typedef int (*Hookfn) _((Hookdef, void *));
+typedef int (*Hookfn) (Hookdef, void *);
 
 struct hookdef {
     Hookdef next;
@@ -1789,33 +1789,33 @@ typedef const struct gsu_array *GsuArray;
 typedef const struct gsu_hash *GsuHash;
 
 struct gsu_scalar {
-    char *(*getfn) _((Param));
-    void (*setfn) _((Param, char  *));
-    void (*unsetfn) _((Param, int));
+    char *(*getfn) (Param);
+    void (*setfn) (Param, char  *);
+    void (*unsetfn) (Param, int);
 };
 
 struct gsu_integer {
-    zlong (*getfn) _((Param));
-    void (*setfn) _((Param, zlong));
-    void (*unsetfn) _((Param, int));
+    zlong (*getfn) (Param);
+    void (*setfn) (Param, zlong);
+    void (*unsetfn) (Param, int);
 };
 
 struct gsu_float {
-    double (*getfn) _((Param));
-    void (*setfn) _((Param, double));
-    void (*unsetfn) _((Param, int));
+    double (*getfn) (Param);
+    void (*setfn) (Param, double);
+    void (*unsetfn) (Param, int);
 };
 
 struct gsu_array {
-    char **(*getfn) _((Param));
-    void (*setfn) _((Param, char **));
-    void (*unsetfn) _((Param, int));
+    char **(*getfn) (Param);
+    void (*setfn) (Param, char **);
+    void (*unsetfn) (Param, int);
 };
 
 struct gsu_hash {
-    HashTable (*getfn) _((Param));
-    void (*setfn) _((Param, HashTable));
-    void (*unsetfn) _((Param, int));
+    HashTable (*getfn) (Param);
+    void (*setfn) (Param, HashTable);
+    void (*unsetfn) (Param, int);
 };
 
 
@@ -2984,7 +2984,7 @@ enum errflag_bits {
 /* Sorting */
 /***********/
 
-typedef int (*CompareFn) _((const void *, const void *));
+typedef int (*CompareFn) (const void *, const void *);
 
 enum {
     SORTIT_ANYOLDHOW = 0,	/* Defaults */
@@ -3042,13 +3042,13 @@ struct hist_stack {
     short *chwords;
     int chwordlen;
     int chwordpos;
-    int (*hgetc) _((void));
-    void (*hungetc) _((int));
-    void (*hwaddc) _((int));
-    void (*hwbegin) _((int));
-    void (*hwabort) _((void));
-    void (*hwend) _((void));
-    void (*addtoline) _((int));
+    int (*hgetc) (void);
+    void (*hungetc) (int);
+    void (*hwaddc) (int);
+    void (*hwbegin) (int);
+    void (*hwabort) (void);
+    void (*hwend) (void);
+    void (*addtoline) (int);
     unsigned char *cstack;
     int csp;
     int hist_keep_comment;
@@ -3218,7 +3218,7 @@ enum {
 
 /* compctl entry point pointers */
 
-typedef int (*CompctlReadFn) _((char *, char **, Options, char *));
+typedef int (*CompctlReadFn) (char *, char **, Options, char *);
 
 /* ZLE entry point pointer */
 
diff --git a/Src/zsh_system.h b/Src/zsh_system.h
index 16f724401..5c004d53e 100644
--- a/Src/zsh_system.h
+++ b/Src/zsh_system.h
@@ -82,12 +82,6 @@
  */
 #define _STRPTIME_DONTZERO
 
-#ifdef PROTOTYPES
-# define _(Args) Args
-#else
-# define _(Args) ()
-#endif
-
 #ifndef HAVE_ALLOCA
 # define alloca zhalloc
 #else
@@ -101,7 +95,7 @@
  #   pragma alloca
 #   else
 #    ifndef alloca
-char *alloca _((size_t));
+char *alloca (size_t);
 #    endif
 #   endif
 #  endif
diff --git a/aclocal.m4 b/aclocal.m4
index c26e2d834..792d533f2 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -2,56 +2,6 @@
 # Copyright (C) 1992, 1994 Free Software Foundation, Inc.
 # Francois Pinard <pinard@iro.umontreal.ca>, 1992.
 
-# @defmac fp_PROG_CC_STDC
-# @maindex PROG_CC_STDC
-# @ovindex CC
-# If the C compiler in not in ANSI C mode by default, try to add an option
-# to output variable @code{CC} to make it so.  This macro tries various
-# options that select ANSI C on some system or another.  It considers the
-# compiler to be in ANSI C mode if it defines @code{__STDC__} to 1 and
-# handles function prototypes correctly.
-# 
-# If you use this macro, you should check after calling it whether the C
-# compiler has been set to accept ANSI C; if not, the shell variable
-# @code{fp_cv_prog_cc_stdc} is set to @samp{no}.  If you wrote your source
-# code in ANSI C, you can make an un-ANSIfied copy of it by using the
-# program @code{ansi2knr}, which comes with Ghostscript.
-# @end defmac
-
-define(fp_PROG_CC_STDC,
-[AC_CACHE_CHECK(for ${CC-cc} option to accept ANSI C,
-fp_cv_prog_cc_stdc,
-[fp_cv_prog_cc_stdc=no
-ac_save_CFLAGS="$CFLAGS"
-# Don't try gcc -ansi; that turns off useful extensions and
-# breaks some systems' header files.
-# AIX			-qlanglvl=ansi
-# Ultrix and OSF/1	-std1
-# HP-UX			-Ae  or  -Aa -D_HPUX_SOURCE
-# SVR4			-Xc
-#  For HP-UX, we try -Ae first; this turns on ANSI but also extensions,
-#  as well as defining _HPUX_SOURCE, and we can then use long long.
-#  We keep the old version for backward compatibility.
-for ac_arg in "" -qlanglvl=ansi -std1 -Ae "-Aa -D_HPUX_SOURCE" -Xc
-do
-  CFLAGS="$ac_save_CFLAGS $ac_arg"
-  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
-[#ifndef __STDC__
-choke me
-#endif	
-]], [[int test (int i, double x);
-struct s1 {int (*f) (int a);};
-struct s2 {int (*f) (double a);};]])],
-[fp_cv_prog_cc_stdc="$ac_arg"; break],[])
-done
-CFLAGS="$ac_save_CFLAGS"
-])
-case "x$fp_cv_prog_cc_stdc" in
-  x|xno) ;;
-  *) CC="$CC $fp_cv_prog_cc_stdc" ;;
-esac
-])
-
 AC_DEFUN(AC_PROG_LN,
 [AC_MSG_CHECKING(whether ln works)
 AC_CACHE_VAL(ac_cv_prog_LN,
diff --git a/configure.ac b/configure.ac
index 175d90433..ba3f2fe90 100644
--- a/configure.ac
+++ b/configure.ac
@@ -273,11 +273,6 @@ fi],
 AC_DEFINE(CONFIG_LOCALE)
 )
 
-dnl Do you want to compile as K&R C.
-AC_ARG_ENABLE(ansi2knr,
-AS_HELP_STRING([--enable-ansi2knr],[translate source to K&R C before compiling]),
-[ansi2knr="$enableval"], [ansi2knr=default])
-
 ifdef([runhelpdir],[undefine([runhelpdir])])dnl
 AC_ARG_ENABLE(runhelpdir,
 AS_HELP_STRING([--enable-runhelpdir=DIR],[the directory in which to install run-help files]),
@@ -483,7 +478,7 @@ fi
 dnl if the user hasn't specified CFLAGS, then
 dnl   if compiler is gcc, then use -O2 and some warning flags
 dnl   else use -O
-if test -n "$auto_cflags" && test ."$ansi2knr" != .yes; then
+if test -n "$auto_cflags"; then
   if test "${enable_zsh_debug}" = yes; then
     if test -n "$GCC"; then
       CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -ggdb"
@@ -558,28 +553,6 @@ case "$host_os" in
 esac
 
 fp_PROG_CC_STDC
-AC_MSG_CHECKING([whether to use prototypes])
-if test ."$ansi2knr" = .yes || test ."$ansi2knr" = .no; then
-  msg="(overridden) "
-else
-  msg=
-  if test ."$fp_cv_prog_cc_stdc" = .no; then
-    ansi2knr=yes
-  else
-    ansi2knr=no
-  fi
-fi
-AH_TEMPLATE([PROTOTYPES],
-[Define to 1 if ANSI function prototypes are usable.])
-if test "$ansi2knr" = yes; then
-  AC_MSG_RESULT(${msg}no)
-  U=_
-else
-  AC_MSG_RESULT(${msg}yes)
-  AC_DEFINE(PROTOTYPES)
-  U=
-fi
-AC_SUBST(U)
 
 AC_FUNC_ALLOCA              dnl Check how to get `alloca'.
 
@@ -647,18 +620,6 @@ case "$LC_PAPER" in
 esac
 AC_SUBST(PAPERSIZE)
 
-AC_CHECK_PROGS([ANSI2KNR], [ansi2knr], [: ansi2knr])
-
-if test x"$ansi2knr" = xyes && test x"$ANSI2KNR" = x": ansi2knr"; then
-    echo "----------"
-    echo "configure fatal error:"
-    echo "ansi2knr was specified (--enable-ansi2knr) but the program could not be found."
-    echo "Either remove the configure option if it is not required or build the ansi2knr"
-    echo "program before reconfiguring Zsh.  The source code for ansi2knr is also"
-    echo "available in the GPL directory on Zsh distribution sites."
-    exit 1
-fi
-
 dnl ------------------
 dnl CHECK HEADER FILES
 dnl ------------------