Ensure that getopt() gets declared by <unistd.h>.

ChangeLog

@@ -1,3 +1,13 @@
+2009-08-12  Bruno Haible  <bruno@clisp.org>
+
+	Ensure that getopt() gets declared by <unistd.h>.
+	* lib/unistd.in.h: Conditionally include getopt.h.
+	* m4/getopt.m4 (gl_GETOPT_SUBSTITUTE): Require gl_UNISTD_H_DEFAULTS.
+	Set GNULIB_UNISTD_H_GETOPT.
+	* m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Initialize
+	GNULIB_UNISTD_H_GETOPT.
+	* modules/unistd (Makefile.am): Substitute GNULIB_UNISTD_H_GETOPT.
+
 2009-08-12  Bruno Haible  <bruno@clisp.org>
 
 	Clarify logic.

lib/unistd.in.h

@@ -43,6 +43,11 @@
 # include <sys/types.h>
 #endif
 
+/* Get getopt(), optarg, optind, opterr, optopt.  */
+#if @GNULIB_UNISTD_H_GETOPT@
+# include <getopt.h>
+#endif
+
 #if @GNULIB_GETHOSTNAME@
 /* Get all possible declarations of gethostname().  */
 # if @UNISTD_H_HAVE_WINSOCK2_H@

m4/getopt.m4

@@ -1,4 +1,4 @@
-# getopt.m4 serial 16
+# getopt.m4 serial 17
 dnl Copyright (C) 2002-2006, 2008-2009 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -10,9 +10,14 @@ dnl with or without modifications, as long as this notice is preserved.
 
 AC_DEFUN([gl_GETOPT_SUBSTITUTE],
 [
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  dnl Arrange for getopt.h to be created.
+  gl_GETOPT_SUBSTITUTE_HEADER
+  dnl Arrange for unistd.h to include getopt.h.
+  GNULIB_UNISTD_H_GETOPT=1
+  dnl Arrange to compile the getopt implementation.
   AC_LIBOBJ([getopt])
   AC_LIBOBJ([getopt1])
-  gl_GETOPT_SUBSTITUTE_HEADER
   gl_PREREQ_GETOPT
 ])
 

m4/unistd_h.m4

@@ -52,6 +52,7 @@ AC_DEFUN([gl_UNISTD_H_DEFAULTS],
   GNULIB_LSEEK=0;            AC_SUBST([GNULIB_LSEEK])
   GNULIB_READLINK=0;         AC_SUBST([GNULIB_READLINK])
   GNULIB_SLEEP=0;            AC_SUBST([GNULIB_SLEEP])
+  GNULIB_UNISTD_H_GETOPT=0;  AC_SUBST([GNULIB_UNISTD_H_GETOPT])
   GNULIB_UNISTD_H_SIGPIPE=0; AC_SUBST([GNULIB_UNISTD_H_SIGPIPE])
   GNULIB_WRITE=0;            AC_SUBST([GNULIB_WRITE])
   dnl Assume proper GNU behavior unless another module says otherwise.

modules/unistd

@@ -44,6 +44,7 @@ unistd.h: unistd.in.h
 	      -e 's|@''GNULIB_LSEEK''@|$(GNULIB_LSEEK)|g' \
 	      -e 's|@''GNULIB_READLINK''@|$(GNULIB_READLINK)|g' \
 	      -e 's|@''GNULIB_SLEEP''@|$(GNULIB_SLEEP)|g' \
+	      -e 's|@''GNULIB_UNISTD_H_GETOPT''@|$(GNULIB_UNISTD_H_GETOPT)|g' \
 	      -e 's|@''GNULIB_UNISTD_H_SIGPIPE''@|$(GNULIB_UNISTD_H_SIGPIPE)|g' \
 	      -e 's|@''GNULIB_WRITE''@|$(GNULIB_WRITE)|g' \
 	      -e 's|@''HAVE_DUP2''@|$(HAVE_DUP2)|g' \