Centralize getopt-related declarations in a new header file pg_getopt.h.

We used to have externs for getopt() and its API variables scattered
all over the place.  Now that we find we're going to need to tweak the
variable declarations for Cygwin, it seems like a good idea to have
just one place to tweak.

In this commit, the variables are declared "#ifndef HAVE_GETOPT_H".
That may or may not work everywhere, but we'll soon find out.

Andres Freund

contrib/oid2name/oid2name.c

@@ -9,14 +9,8 @@
  */
 #include "postgres_fe.h"
 
-#include <unistd.h>
-#ifdef HAVE_GETOPT_H
-#include <getopt.h>
-#endif
-
-extern char *optarg;
-
 #include "libpq-fe.h"
+#include "pg_getopt.h"
 
 /* an extensible array to keep track of elements to show */
 typedef struct

contrib/pg_archivecleanup/pg_archivecleanup.c

@@ -17,20 +17,9 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <signal.h>
-
-#ifndef WIN32
 #include <sys/time.h>
-#include <unistd.h>
-
-#ifdef HAVE_GETOPT_H
-#include <getopt.h>
-#endif
-#else							/* WIN32 */
-extern int	getopt(int argc, char *const argv[], const char *optstring);
-#endif   /* ! WIN32 */
 
-extern char *optarg;
-extern int	optind;
+#include "pg_getopt.h"
 
 const char *progname;
 

contrib/pg_standby/pg_standby.c

@@ -28,20 +28,9 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <signal.h>
-
-#ifdef WIN32
-int			getopt(int argc, char *const argv[], const char *optstring);
-#else
 #include <sys/time.h>
-#include <unistd.h>
-
-#ifdef HAVE_GETOPT_H
-#include <getopt.h>
-#endif
-#endif   /* ! WIN32 */
 
-extern char *optarg;
-extern int	optind;
+#include "pg_getopt.h"
 
 const char *progname;
 

contrib/pg_upgrade/option.c

@@ -10,10 +10,10 @@
 #include "postgres_fe.h"
 
 #include "miscadmin.h"
+#include "getopt_long.h"
 
 #include "pg_upgrade.h"
 
-#include <getopt_long.h>
 #include <time.h>
 #include <sys/types.h>
 #include <sys/stat.h>

contrib/pgbench/pgbench.c

@@ -40,12 +40,7 @@
 #include <ctype.h>
 #include <math.h>
 #include <signal.h>
-
-#ifndef WIN32
 #include <sys/time.h>
-#include <unistd.h>
-#endif   /* ! WIN32 */
-
 #ifdef HAVE_SYS_SELECT_H
 #include <sys/select.h>
 #endif
@@ -89,9 +84,6 @@ static int	pthread_create(pthread_t *thread, pthread_attr_t *attr, void *(*start
 static int	pthread_join(pthread_t th, void **thread_return);
 #endif
 
-extern char *optarg;
-extern int	optind;
-
 
 /********************************************************************
  * some configurable parameters */

contrib/vacuumlo/vacuumlo.c

@@ -22,15 +22,12 @@
 #endif
 
 #include "libpq-fe.h"
+#include "pg_getopt.h"
 
 #define atooid(x)  ((Oid) strtoul((x), NULL, 10))
 
 #define BUFSIZE			1024
 
-extern char *optarg;
-extern int	optind,
-			opterr;
-
 enum trivalue
 {
 	TRI_DEFAULT,

src/backend/bootstrap/bootstrap.c

@@ -17,9 +17,6 @@
 #include <time.h>
 #include <unistd.h>
 #include <signal.h>
-#ifdef HAVE_GETOPT_H
-#include <getopt.h>
-#endif
 
 #include "access/htup_details.h"
 #include "bootstrap/bootstrap.h"
@@ -29,6 +26,7 @@
 #include "libpq/pqsignal.h"
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
+#include "pg_getopt.h"
 #include "postmaster/bgwriter.h"
 #include "postmaster/startup.h"
 #include "postmaster/walwriter.h"
@@ -46,9 +44,6 @@
 #include "utils/relmapper.h"
 #include "utils/tqual.h"
 
-extern int	optind;
-extern char *optarg;
-
 uint32		bootstrap_data_checksum_version = 0;		/* No checksum */
 
 

src/backend/postmaster/postmaster.c

@@ -83,10 +83,6 @@
 #include <sys/select.h>
 #endif
 
-#ifdef HAVE_GETOPT_H
-#include <getopt.h>
-#endif
-
 #ifdef USE_BONJOUR
 #include <dns_sd.h>
 #endif
@@ -101,6 +97,7 @@
 #include "libpq/libpq.h"
 #include "libpq/pqsignal.h"
 #include "miscadmin.h"
+#include "pg_getopt.h"
 #include "pgstat.h"
 #include "postmaster/autovacuum.h"
 #include "postmaster/bgworker_internals.h"
@@ -352,14 +349,6 @@ static volatile bool HaveCrashedWorker = false;
 static unsigned int random_seed = 0;
 static struct timeval random_start_time;
 
-extern char *optarg;
-extern int	optind,
-			opterr;
-
-#ifdef HAVE_INT_OPTRESET
-extern int	optreset;			/* might not be declared by system headers */
-#endif
-
 #ifdef USE_BONJOUR
 static DNSServiceRef bonjour_sdref = NULL;
 #endif

src/backend/tcop/postgres.c

@@ -32,9 +32,6 @@
 #include <sys/time.h>
 #include <sys/resource.h>
 #endif
-#ifdef HAVE_GETOPT_H
-#include <getopt.h>
-#endif
 
 #ifndef HAVE_GETRUSAGE
 #include "rusagestub.h"
@@ -55,6 +52,7 @@
 #include "pg_trace.h"
 #include "parser/analyze.h"
 #include "parser/parser.h"
+#include "pg_getopt.h"
 #include "postmaster/autovacuum.h"
 #include "postmaster/postmaster.h"
 #include "replication/walsender.h"
@@ -77,14 +75,6 @@
 #include "mb/pg_wchar.h"
 
 
-extern char *optarg;
-extern int	optind;
-
-#ifdef HAVE_INT_OPTRESET
-extern int	optreset;			/* might not be declared by system headers */
-#endif
-
-
 /* ----------------
  *		global variables
  * ----------------

src/bin/pg_dump/pg_dump.c

@@ -63,10 +63,6 @@
 #include "dumputils.h"
 #include "parallel.h"
 
-extern char *optarg;
-extern int	optind,
-			opterr;
-
 
 typedef struct
 {

src/bin/pg_dump/pg_restore.c

@@ -43,6 +43,7 @@
 #include "pg_backup_utils.h"
 #include "dumputils.h"
 #include "parallel.h"
+#include "getopt_long.h"
 
 #include <ctype.h>
 
@@ -50,13 +51,6 @@
 #include <termios.h>
 #endif
 
-#include <unistd.h>
-
-#include "getopt_long.h"
-
-extern char *optarg;
-extern int	optind;
-
 #ifdef ENABLE_NLS
 #include <locale.h>
 #endif

src/bin/pg_resetxlog/pg_resetxlog.c

@@ -44,9 +44,6 @@
 #include <sys/time.h>
 #include <time.h>
 #include <unistd.h>
-#ifdef HAVE_GETOPT_H
-#include <getopt.h>
-#endif
 
 #include "access/transam.h"
 #include "access/tuptoaster.h"
@@ -55,9 +52,7 @@
 #include "catalog/catversion.h"
 #include "catalog/pg_control.h"
 #include "common/fe_memutils.h"
-
-extern int	optind;
-extern char *optarg;
+#include "pg_getopt.h"
 
 
 static ControlFileData ControlFile;		/* pg_control values */

src/bin/psql/startup.c

@@ -386,8 +386,6 @@ parse_psql_options(int argc, char *argv[], struct adhoc_opts * options)
 	};
 
 	int			optindex;
-	extern char *optarg;
-	extern int	optind;
 	int			c;
 
 	memset(options, 0, sizeof *options);

src/include/getopt_long.h

@@ -9,15 +9,7 @@
 #ifndef GETOPT_LONG_H
 #define GETOPT_LONG_H
 
-#ifdef HAVE_GETOPT_H
-#include <getopt.h>
-#endif
-
-/* These are picked up from the system's getopt() facility. */
-extern int	opterr;
-extern int	optind;
-extern int	optopt;
-extern char *optarg;
+#include "pg_getopt.h"
 
 #ifndef HAVE_STRUCT_OPTION
 

src/include/pg_getopt.h

+/*
+ * Portions Copyright (c) 1987, 1993, 1994
+ * The Regents of the University of California.  All rights reserved.
+ *
+ * Portions Copyright (c) 2003-2014, PostgreSQL Global Development Group
+ *
+ * src/include/pg_getopt.h
+ */
+#ifndef PG_GETOPT_H
+#define PG_GETOPT_H
+
+/* POSIX says getopt() is provided by unistd.h */
+#include <unistd.h>
+
+/* rely on the system's getopt.h if present */
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#endif
+
+/*
+ * If we have <getopt.h>, assume it declares these variables, else do that
+ * ourselves.  (We used to just declare them unconditionally, but Cygwin
+ * doesn't like that.)
+ */
+#ifndef HAVE_GETOPT_H
+
+extern char *optarg;
+extern int	optind;
+extern int	opterr;
+extern int	optopt;
+
+#ifdef HAVE_INT_OPTRESET
+extern int	optreset;
+#endif
+
+#endif   /* HAVE_GETOPT_H */
+
+#ifndef HAVE_GETOPT
+extern int	getopt(int nargc, char *const * nargv, const char *ostr);
+#endif
+
+#endif   /* PG_GETOPT_H */

src/include/port.h

@@ -382,10 +382,6 @@ extern int	fls(int mask);
 #define ftello(a)		ftell(a)
 #endif
 
-#ifndef HAVE_GETOPT
-extern int	getopt(int nargc, char *const * nargv, const char *ostr);
-#endif
-
 #if !defined(HAVE_GETPEEREID) && !defined(WIN32)
 extern int	getpeereid(int sock, uid_t *uid, gid_t *gid);
 #endif

src/port/getopt.c

@@ -32,6 +32,8 @@
 
 #include "c.h"
 
+#include "pg_getopt.h"
+
 #if defined(LIBC_SCCS) && !defined(lint)
 static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
 #endif   /* LIBC_SCCS and not lint */
@@ -49,20 +51,13 @@ int			opterr = 1,			/* if error message should be printed */
 			optind = 1,			/* index into parent argv vector */
 			optopt;				/* character checked for validity */
 char	   *optarg;				/* argument associated with option */
-#else
 
-extern int	opterr;
-extern int	optind;
-extern int	optopt;
-extern char *optarg;
 #endif
 
 #define BADCH	(int)'?'
 #define BADARG	(int)':'
 #define EMSG	""
 
-int			getopt(int nargc, char *const * nargv, const char *ostr);
-
 /*
  * getopt
  *	Parse argc/argv argument vector.

src/test/isolation/isolationtester.c

@@ -10,29 +10,17 @@
 #ifdef WIN32
 #include <windows.h>
 #endif
-
-#ifndef WIN32
 #include <sys/time.h>
-#include <unistd.h>
-
-#ifdef HAVE_GETOPT_H
-#include <getopt.h>
-#endif
-#else
-int			getopt(int argc, char *const argv[], const char *optstring);
-#endif   /* ! WIN32 */
-
 #ifdef HAVE_SYS_SELECT_H
 #include <sys/select.h>
 #endif
 
 #include "libpq-fe.h"
 #include "pqexpbuffer.h"
+#include "pg_getopt.h"
 
 #include "isolationtester.h"
 
-extern int	optind;
-
 #define PREP_WAITING "isolationtester_waiting"
 
 /*

src/timezone/zic.c

@@ -8,15 +8,11 @@
 
 #include "postgres_fe.h"
 
-#ifdef HAVE_GETOPT_H
-#include <getopt.h>
-#endif
 #include <limits.h>
 #include <locale.h>
 #include <time.h>
 
-extern int	optind;
-extern char *optarg;
+#include "pg_getopt.h"
 
 #include "private.h"
 #include "pgtz.h"