[bpt/emacs.git] / m4 / getopt.m4

# getopt.m4 serial 42
dnl Copyright (C) 2002-2006, 2008-2012 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

# Request a POSIX compliant getopt function.
AC_DEFUN([gl_FUNC_GETOPT_POSIX],
[
  m4_divert_text([DEFAULTS], [gl_getopt_required=POSIX])
  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
  dnl Other modules can request the gnulib implementation of the getopt
  dnl functions unconditionally, by defining gl_REPLACE_GETOPT_ALWAYS.
  dnl argp.m4 does this.
  m4_ifdef([gl_REPLACE_GETOPT_ALWAYS], [
    gl_GETOPT_IFELSE([], [])
    REPLACE_GETOPT=1
  ], [
    REPLACE_GETOPT=0
    gl_GETOPT_IFELSE([
      REPLACE_GETOPT=1
    ],
    [])
  ])
  if test $REPLACE_GETOPT = 1; then
    dnl Arrange for getopt.h to be created.
    gl_GETOPT_SUBSTITUTE_HEADER
  fi
])

# Request a POSIX compliant getopt function with GNU extensions (such as
# options with optional arguments) and the functions getopt_long,
# getopt_long_only.
AC_DEFUN([gl_FUNC_GETOPT_GNU],
[
  m4_divert_text([INIT_PREPARE], [gl_getopt_required=GNU])

  AC_REQUIRE([gl_FUNC_GETOPT_POSIX])
])

# emacs' configure.in uses this.
AC_DEFUN([gl_GETOPT_IFELSE],
[
  AC_REQUIRE([gl_GETOPT_CHECK_HEADERS])
  AS_IF([test -n "$gl_replace_getopt"], [$1], [$2])
])

# Determine whether to replace the entire getopt facility.
AC_DEFUN([gl_GETOPT_CHECK_HEADERS],
[
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_REQUIRE([AC_PROG_AWK]) dnl for awk that supports ENVIRON

  dnl Persuade Solaris <unistd.h> to declare optarg, optind, opterr, optopt.
  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])

  gl_CHECK_NEXT_HEADERS([getopt.h])
  if test $ac_cv_header_getopt_h = yes; then
    HAVE_GETOPT_H=1
  else
    HAVE_GETOPT_H=0
  fi
  AC_SUBST([HAVE_GETOPT_H])

  gl_replace_getopt=

  dnl Test whether <getopt.h> is available.
  if test -z "$gl_replace_getopt" && test $gl_getopt_required = GNU; then
    AC_CHECK_HEADERS([getopt.h], [], [gl_replace_getopt=yes])
  fi

  dnl Test whether the function getopt_long is available.
  if test -z "$gl_replace_getopt" && test $gl_getopt_required = GNU; then
    AC_CHECK_FUNCS([getopt_long_only], [], [gl_replace_getopt=yes])
  fi

  dnl mingw's getopt (in libmingwex.a) does weird things when the options
  dnl strings starts with '+' and it's not the first call.  Some internal state
  dnl is left over from earlier calls, and neither setting optind = 0 nor
  dnl setting optreset = 1 get rid of this internal state.
  dnl POSIX is silent on optind vs. optreset, so we allow either behavior.
  dnl POSIX 2008 does not specify leading '+' behavior, but see
  dnl http://austingroupbugs.net/view.php?id=191 for a recommendation on
  dnl the next version of POSIX.  For now, we only guarantee leading '+'
  dnl behavior with getopt-gnu.
  if test -z "$gl_replace_getopt"; then
    AC_CACHE_CHECK([whether getopt is POSIX compatible],
      [gl_cv_func_getopt_posix],
      [
        dnl BSD getopt_long uses an incompatible method to reset option
        dnl processing.  Existence of the optreset variable, in and of
        dnl itself, is not a reason to replace getopt, but knowledge
        dnl of the variable is needed to determine how to reset and
        dnl whether a reset reparses the environment.  Solaris
        dnl supports neither optreset nor optind=0, but keeps no state
        dnl that needs a reset beyond setting optind=1; detect Solaris
        dnl by getopt_clip.
        AC_LINK_IFELSE(
          [AC_LANG_PROGRAM(
             [[#include <unistd.h>]],
             [[int *p = &optreset; return optreset;]])],
          [gl_optind_min=1],
          [AC_COMPILE_IFELSE(
             [AC_LANG_PROGRAM(
                [[#include <getopt.h>]],
                [[return !getopt_clip;]])],
             [gl_optind_min=1],
             [gl_optind_min=0])])

        dnl This test fails on mingw and succeeds on many other platforms.
        gl_save_CPPFLAGS=$CPPFLAGS
        CPPFLAGS="$CPPFLAGS -DOPTIND_MIN=$gl_optind_min"
        AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

int
main ()
{
  {
    static char program[] = "program";
    static char a[] = "-a";
    static char foo[] = "foo";
    static char bar[] = "bar";
    char *argv[] = { program, a, foo, bar, NULL };
    int c;

    optind = OPTIND_MIN;
    opterr = 0;

    c = getopt (4, argv, "ab");
    if (!(c == 'a'))
      return 1;
    c = getopt (4, argv, "ab");
    if (!(c == -1))
      return 2;
    if (!(optind == 2))
      return 3;
  }
  /* Some internal state exists at this point.  */
  {
    static char program[] = "program";
    static char donald[] = "donald";
    static char p[] = "-p";
    static char billy[] = "billy";
    static char duck[] = "duck";
    static char a[] = "-a";
    static char bar[] = "bar";
    char *argv[] = { program, donald, p, billy, duck, a, bar, NULL };
    int c;

    optind = OPTIND_MIN;
    opterr = 0;

    c = getopt (7, argv, "+abp:q:");
    if (!(c == -1))
      return 4;
    if (!(strcmp (argv[0], "program") == 0))
      return 5;
    if (!(strcmp (argv[1], "donald") == 0))
      return 6;
    if (!(strcmp (argv[2], "-p") == 0))
      return 7;
    if (!(strcmp (argv[3], "billy") == 0))
      return 8;
    if (!(strcmp (argv[4], "duck") == 0))
      return 9;
    if (!(strcmp (argv[5], "-a") == 0))
      return 10;
    if (!(strcmp (argv[6], "bar") == 0))
      return 11;
    if (!(optind == 1))
      return 12;
  }
  /* Detect Mac OS X 10.5, AIX 7.1 bug.  */
  {
    static char program[] = "program";
    static char ab[] = "-ab";
    char *argv[3] = { program, ab, NULL };
    optind = OPTIND_MIN;
    opterr = 0;
    if (getopt (2, argv, "ab:") != 'a')
      return 13;
    if (getopt (2, argv, "ab:") != '?')
      return 14;
    if (optopt != 'b')
      return 15;
    if (optind != 2)
      return 16;
  }

  return 0;
}
]])],
          [gl_cv_func_getopt_posix=yes], [gl_cv_func_getopt_posix=no],
          [case "$host_os" in
             mingw*)         gl_cv_func_getopt_posix="guessing no";;
             darwin* | aix*) gl_cv_func_getopt_posix="guessing no";;
             *)              gl_cv_func_getopt_posix="guessing yes";;
           esac
          ])
        CPPFLAGS=$gl_save_CPPFLAGS
      ])
    case "$gl_cv_func_getopt_posix" in
      *no) gl_replace_getopt=yes ;;
    esac
  fi

  if test -z "$gl_replace_getopt" && test $gl_getopt_required = GNU; then
    AC_CACHE_CHECK([for working GNU getopt function], [gl_cv_func_getopt_gnu],
      [# Even with POSIXLY_CORRECT, the GNU extension of leading '-' in the
       # optstring is necessary for programs like m4 that have POSIX-mandated
       # semantics for supporting options interspersed with files.
       # Also, since getopt_long is a GNU extension, we require optind=0.
       # Bash ties 'set -o posix' to a non-exported POSIXLY_CORRECT;
       # so take care to revert to the correct (non-)export state.
dnl GNU Coding Standards currently allow awk but not env; besides, env
dnl is ambiguous with environment values that contain newlines.
       gl_awk_probe='BEGIN { if ("POSIXLY_CORRECT" in ENVIRON) print "x" }'
       case ${POSIXLY_CORRECT+x}`$AWK "$gl_awk_probe" </dev/null` in
         xx) gl_had_POSIXLY_CORRECT=exported ;;
         x)  gl_had_POSIXLY_CORRECT=yes      ;;
         *)  gl_had_POSIXLY_CORRECT=         ;;
       esac
       POSIXLY_CORRECT=1
       export POSIXLY_CORRECT
       AC_RUN_IFELSE(
        [AC_LANG_PROGRAM([[#include <getopt.h>
                           #include <stddef.h>
                           #include <string.h>
           ]GL_NOCRASH[
           ]], [[
             int result = 0;

             nocrash_init();

             /* This code succeeds on glibc 2.8, OpenBSD 4.0, Cygwin, mingw,
                and fails on Mac OS X 10.5, AIX 5.2, HP-UX 11, IRIX 6.5,
                OSF/1 5.1, Solaris 10.  */
             {
               static char conftest[] = "conftest";
               static char plus[] = "-+";
               char *argv[3] = { conftest, plus, NULL };
               opterr = 0;
               if (getopt (2, argv, "+a") != '?')
                 result |= 1;
             }
             /* This code succeeds on glibc 2.8, mingw,
                and fails on Mac OS X 10.5, OpenBSD 4.0, AIX 5.2, HP-UX 11,
                IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x.  */
             {
               static char program[] = "program";
               static char p[] = "-p";
               static char foo[] = "foo";
               static char bar[] = "bar";
               char *argv[] = { program, p, foo, bar, NULL };

               optind = 1;
               if (getopt (4, argv, "p::") != 'p')
                 result |= 2;
               else if (optarg != NULL)
                 result |= 4;
               else if (getopt (4, argv, "p::") != -1)
                 result |= 6;
               else if (optind != 2)
                 result |= 8;
             }
             /* This code succeeds on glibc 2.8 and fails on Cygwin 1.7.0.  */
             {
               static char program[] = "program";
               static char foo[] = "foo";
               static char p[] = "-p";
               char *argv[] = { program, foo, p, NULL };
               optind = 0;
               if (getopt (3, argv, "-p") != 1)
                 result |= 16;
               else if (getopt (3, argv, "-p") != 'p')
                 result |= 16;
             }
             /* This code fails on glibc 2.11.  */
             {
               static char program[] = "program";
               static char b[] = "-b";
               static char a[] = "-a";
               char *argv[] = { program, b, a, NULL };
               optind = opterr = 0;
               if (getopt (3, argv, "+:a:b") != 'b')
                 result |= 32;
               else if (getopt (3, argv, "+:a:b") != ':')
                 result |= 32;
             }
             /* This code dumps core on glibc 2.14.  */
             {
               static char program[] = "program";
               static char w[] = "-W";
               static char dummy[] = "dummy";
               char *argv[] = { program, w, dummy, NULL };
               optind = opterr = 1;
               if (getopt (3, argv, "W;") != 'W')
                 result |= 64;
             }
             return result;
           ]])],
        [gl_cv_func_getopt_gnu=yes],
        [gl_cv_func_getopt_gnu=no],
        [dnl Cross compiling. Guess based on host and declarations.
         case $host_os:$ac_cv_have_decl_optreset in
           *-gnu*:* | mingw*:*) gl_cv_func_getopt_gnu=no;;
           *:yes)               gl_cv_func_getopt_gnu=no;;
           *)                   gl_cv_func_getopt_gnu=yes;;
         esac
        ])
       case $gl_had_POSIXLY_CORRECT in
         exported) ;;
         yes) AS_UNSET([POSIXLY_CORRECT]); POSIXLY_CORRECT=1 ;;
         *) AS_UNSET([POSIXLY_CORRECT]) ;;
       esac
      ])
    if test "$gl_cv_func_getopt_gnu" = "no"; then
      gl_replace_getopt=yes
    else
      AC_CACHE_CHECK([for working GNU getopt_long function],
        [gl_cv_func_getopt_long_gnu],
        [AC_RUN_IFELSE(
           [AC_LANG_PROGRAM(
              [[#include <getopt.h>
                #include <stddef.h>
                #include <string.h>
              ]],
              [[static const struct option long_options[] =
                  {
                    { "xtremely-",no_argument,       NULL, 1003 },
                    { "xtra",     no_argument,       NULL, 1001 },
                    { "xtreme",   no_argument,       NULL, 1002 },
                    { "xtremely", no_argument,       NULL, 1003 },
                    { NULL,       0,                 NULL, 0 }
                  };
                /* This code fails on OpenBSD 5.0.  */
                {
                  static char program[] = "program";
                  static char xtremel[] = "--xtremel";
                  char *argv[] = { program, xtremel, NULL };
                  int option_index;
                  optind = 1; opterr = 0;
                  if (getopt_long (2, argv, "", long_options, &option_index) != 1003)
                    return 1;
                }
                return 0;
              ]])],
           [gl_cv_func_getopt_long_gnu=yes],
           [gl_cv_func_getopt_long_gnu=no],
           [dnl Cross compiling. Guess no on OpenBSD, yes otherwise.
            case "$host_os" in
              openbsd*) gl_cv_func_getopt_long_gnu="guessing no";;
              *)        gl_cv_func_getopt_long_gnu="guessing yes";;
            esac
           ])
        ])
      case "$gl_cv_func_getopt_long_gnu" in
        *yes) ;;
        *) gl_replace_getopt=yes ;;
      esac
    fi
  fi
])

# emacs' configure.in uses this.
AC_DEFUN([gl_GETOPT_SUBSTITUTE_HEADER],
[
  GETOPT_H=getopt.h
  AC_DEFINE([__GETOPT_PREFIX], [[rpl_]],
    [Define to rpl_ if the getopt replacement functions and variables
     should be used.])
  AC_SUBST([GETOPT_H])
])

# Prerequisites of lib/getopt*.
# emacs' configure.in uses this.
AC_DEFUN([gl_PREREQ_GETOPT],
[
  AC_CHECK_DECLS_ONCE([getenv])
])
Commit	Line	Data
47d0c011	1	# getopt.m4 serial 42
caf8a9b2	2	dnl Copyright (C) 2002-2006, 2008-2012 Free Software Foundation, Inc.
9eff9fe3 PE	3	dnl This file is free software; the Free Software Foundation
	4	dnl gives unlimited permission to copy and/or distribute it,
	5	dnl with or without modifications, as long as this notice is preserved.
	6
e275c824 PE	7	# Request a POSIX compliant getopt function.
	8	AC_DEFUN([gl_FUNC_GETOPT_POSIX],
	9	[
	10	m4_divert_text([DEFAULTS], [gl_getopt_required=POSIX])
	11	AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
8aeb5be9 PE	12	dnl Other modules can request the gnulib implementation of the getopt
	13	dnl functions unconditionally, by defining gl_REPLACE_GETOPT_ALWAYS.
	14	dnl argp.m4 does this.
	15	m4_ifdef([gl_REPLACE_GETOPT_ALWAYS], [
	16	gl_GETOPT_IFELSE([], [])
	17	REPLACE_GETOPT=1
	18	], [
	19	REPLACE_GETOPT=0
	20	gl_GETOPT_IFELSE([
	21	REPLACE_GETOPT=1
	22	],
	23	[])
	24	])
	25	if test $REPLACE_GETOPT = 1; then
	26	dnl Arrange for getopt.h to be created.
	27	gl_GETOPT_SUBSTITUTE_HEADER
8aeb5be9	28	fi
e275c824 PE	29	])
	30
	31	# Request a POSIX compliant getopt function with GNU extensions (such as
	32	# options with optional arguments) and the functions getopt_long,
	33	# getopt_long_only.
	34	AC_DEFUN([gl_FUNC_GETOPT_GNU],
	35	[
	36	m4_divert_text([INIT_PREPARE], [gl_getopt_required=GNU])
	37
	38	AC_REQUIRE([gl_FUNC_GETOPT_POSIX])
	39	])
9eff9fe3	40
e275c824 PE	41	# emacs' configure.in uses this.
e275c824 PE	42	AC_DEFUN([gl_GETOPT_IFELSE],
9eff9fe3	43	[
e275c824 PE	44	AC_REQUIRE([gl_GETOPT_CHECK_HEADERS])
e275c824 PE	45	AS_IF([test -n "$gl_replace_getopt"], [$1], [$2])
9eff9fe3 PE	46	])
9eff9fe3 PE	47
e275c824	48	# Determine whether to replace the entire getopt facility.
9eff9fe3 PE	49	AC_DEFUN([gl_GETOPT_CHECK_HEADERS],
9eff9fe3 PE	50	[
e275c824 PE	51	AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
	52	AC_REQUIRE([AC_PROG_AWK]) dnl for awk that supports ENVIRON
	53
	54	dnl Persuade Solaris <unistd.h> to declare optarg, optind, opterr, optopt.
	55	AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
	56
	57	gl_CHECK_NEXT_HEADERS([getopt.h])
e275c824 PE	58	if test $ac_cv_header_getopt_h = yes; then
	59	HAVE_GETOPT_H=1
	60	else
	61	HAVE_GETOPT_H=0
	62	fi
	63	AC_SUBST([HAVE_GETOPT_H])
	64
	65	gl_replace_getopt=
	66
	67	dnl Test whether <getopt.h> is available.
	68	if test -z "$gl_replace_getopt" && test $gl_getopt_required = GNU; then
	69	AC_CHECK_HEADERS([getopt.h], [], [gl_replace_getopt=yes])
	70	fi
	71
	72	dnl Test whether the function getopt_long is available.
	73	if test -z "$gl_replace_getopt" && test $gl_getopt_required = GNU; then
	74	AC_CHECK_FUNCS([getopt_long_only], [], [gl_replace_getopt=yes])
9eff9fe3 PE	75	fi
9eff9fe3 PE	76
e275c824 PE	77	dnl mingw's getopt (in libmingwex.a) does weird things when the options
	78	dnl strings starts with '+' and it's not the first call. Some internal state
	79	dnl is left over from earlier calls, and neither setting optind = 0 nor
	80	dnl setting optreset = 1 get rid of this internal state.
	81	dnl POSIX is silent on optind vs. optreset, so we allow either behavior.
	82	dnl POSIX 2008 does not specify leading '+' behavior, but see
	83	dnl http://austingroupbugs.net/view.php?id=191 for a recommendation on
	84	dnl the next version of POSIX. For now, we only guarantee leading '+'
	85	dnl behavior with getopt-gnu.
	86	if test -z "$gl_replace_getopt"; then
	87	AC_CACHE_CHECK([whether getopt is POSIX compatible],
	88	[gl_cv_func_getopt_posix],
	89	[
4a621aae PE	90	dnl BSD getopt_long uses an incompatible method to reset option
4a621aae PE	91	dnl processing. Existence of the optreset variable, in and of
d6974efa PE	92	dnl itself, is not a reason to replace getopt, but knowledge
	93	dnl of the variable is needed to determine how to reset and
	94	dnl whether a reset reparses the environment. Solaris
	95	dnl supports neither optreset nor optind=0, but keeps no state
	96	dnl that needs a reset beyond setting optind=1; detect Solaris
	97	dnl by getopt_clip.
4a621aae	98	AC_LINK_IFELSE(
d6974efa PE	99	[AC_LANG_PROGRAM(
	100	[[#include <unistd.h>]],
	101	[[int *p = &optreset; return optreset;]])],
	102	[gl_optind_min=1],
	103	[AC_COMPILE_IFELSE(
	104	[AC_LANG_PROGRAM(
	105	[[#include <getopt.h>]],
	106	[[return !getopt_clip;]])],
	107	[gl_optind_min=1],
	108	[gl_optind_min=0])])
	109
e275c824	110	dnl This test fails on mingw and succeeds on many other platforms.
d6974efa PE	111	gl_save_CPPFLAGS=$CPPFLAGS
d6974efa PE	112	CPPFLAGS="$CPPFLAGS -DOPTIND_MIN=$gl_optind_min"
e275c824 PE	113	AC_RUN_IFELSE([AC_LANG_SOURCE([[
	114	#include <unistd.h>
	115	#include <stdlib.h>
	116	#include <string.h>
	117
e275c824 PE	118	int
	119	main ()
	120	{
	121	{
4a621aae PE	122	static char program[] = "program";
	123	static char a[] = "-a";
	124	static char foo[] = "foo";
	125	static char bar[] = "bar";
	126	char *argv[] = { program, a, foo, bar, NULL };
e275c824 PE	127	int c;
e275c824 PE	128
e275c824 PE	129	optind = OPTIND_MIN;
	130	opterr = 0;
	131
4a621aae	132	c = getopt (4, argv, "ab");
e275c824 PE	133	if (!(c == 'a'))
e275c824 PE	134	return 1;
4a621aae	135	c = getopt (4, argv, "ab");
e275c824 PE	136	if (!(c == -1))
	137	return 2;
	138	if (!(optind == 2))
	139	return 3;
	140	}
	141	/* Some internal state exists at this point. */
	142	{
4a621aae PE	143	static char program[] = "program";
	144	static char donald[] = "donald";
	145	static char p[] = "-p";
	146	static char billy[] = "billy";
	147	static char duck[] = "duck";
	148	static char a[] = "-a";
	149	static char bar[] = "bar";
	150	char *argv[] = { program, donald, p, billy, duck, a, bar, NULL };
e275c824 PE	151	int c;
e275c824 PE	152
e275c824 PE	153	optind = OPTIND_MIN;
	154	opterr = 0;
	155
4a621aae	156	c = getopt (7, argv, "+abp:q:");
e275c824 PE	157	if (!(c == -1))
	158	return 4;
	159	if (!(strcmp (argv[0], "program") == 0))
	160	return 5;
	161	if (!(strcmp (argv[1], "donald") == 0))
	162	return 6;
	163	if (!(strcmp (argv[2], "-p") == 0))
	164	return 7;
	165	if (!(strcmp (argv[3], "billy") == 0))
	166	return 8;
	167	if (!(strcmp (argv[4], "duck") == 0))
	168	return 9;
	169	if (!(strcmp (argv[5], "-a") == 0))
	170	return 10;
	171	if (!(strcmp (argv[6], "bar") == 0))
	172	return 11;
	173	if (!(optind == 1))
	174	return 12;
	175	}
05730648	176	/* Detect Mac OS X 10.5, AIX 7.1 bug. */
e275c824	177	{
4a621aae PE	178	static char program[] = "program";
	179	static char ab[] = "-ab";
	180	char *argv[3] = { program, ab, NULL };
e275c824 PE	181	optind = OPTIND_MIN;
	182	opterr = 0;
	183	if (getopt (2, argv, "ab:") != 'a')
	184	return 13;
	185	if (getopt (2, argv, "ab:") != '?')
	186	return 14;
	187	if (optopt != 'b')
	188	return 15;
	189	if (optind != 2)
	190	return 16;
	191	}
	192
	193	return 0;
	194	}
	195	]])],
	196	[gl_cv_func_getopt_posix=yes], [gl_cv_func_getopt_posix=no],
	197	[case "$host_os" in
	198	mingw*) gl_cv_func_getopt_posix="guessing no";;
	199	darwin* \| aix*) gl_cv_func_getopt_posix="guessing no";;
	200	*) gl_cv_func_getopt_posix="guessing yes";;
	201	esac
	202	])
d6974efa	203	CPPFLAGS=$gl_save_CPPFLAGS
e275c824 PE	204	])
	205	case "$gl_cv_func_getopt_posix" in
	206	*no) gl_replace_getopt=yes ;;
	207	esac
	208	fi
	209
	210	if test -z "$gl_replace_getopt" && test $gl_getopt_required = GNU; then
	211	AC_CACHE_CHECK([for working GNU getopt function], [gl_cv_func_getopt_gnu],
	212	[# Even with POSIXLY_CORRECT, the GNU extension of leading '-' in the
	213	# optstring is necessary for programs like m4 that have POSIX-mandated
	214	# semantics for supporting options interspersed with files.
	215	# Also, since getopt_long is a GNU extension, we require optind=0.
	216	# Bash ties 'set -o posix' to a non-exported POSIXLY_CORRECT;
	217	# so take care to revert to the correct (non-)export state.
	218	dnl GNU Coding Standards currently allow awk but not env; besides, env
	219	dnl is ambiguous with environment values that contain newlines.
	220	gl_awk_probe='BEGIN { if ("POSIXLY_CORRECT" in ENVIRON) print "x" }'
	221	case ${POSIXLY_CORRECT+x}`$AWK "$gl_awk_probe" </dev/null` in
	222	xx) gl_had_POSIXLY_CORRECT=exported ;;
	223	x) gl_had_POSIXLY_CORRECT=yes ;;
	224	*) gl_had_POSIXLY_CORRECT= ;;
	225	esac
	226	POSIXLY_CORRECT=1
	227	export POSIXLY_CORRECT
	228	AC_RUN_IFELSE(
	229	[AC_LANG_PROGRAM([[#include <getopt.h>
	230	#include <stddef.h>
	231	#include <string.h>
24e0f6b1	232	]GL_NOCRASH[
e275c824 PE	233	]], [[
e275c824 PE	234	int result = 0;
24e0f6b1 PE	235
	236	nocrash_init();
	237
e275c824	238	/* This code succeeds on glibc 2.8, OpenBSD 4.0, Cygwin, mingw,
05730648	239	and fails on Mac OS X 10.5, AIX 5.2, HP-UX 11, IRIX 6.5,
e275c824 PE	240	OSF/1 5.1, Solaris 10. */
e275c824 PE	241	{
4a621aae PE	242	static char conftest[] = "conftest";
	243	static char plus[] = "-+";
	244	char *argv[3] = { conftest, plus, NULL };
e275c824	245	opterr = 0;
4a621aae	246	if (getopt (2, argv, "+a") != '?')
e275c824 PE	247	result \|= 1;
	248	}
	249	/* This code succeeds on glibc 2.8, mingw,
05730648	250	and fails on Mac OS X 10.5, OpenBSD 4.0, AIX 5.2, HP-UX 11,
e275c824 PE	251	IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x. */
e275c824 PE	252	{
4a621aae PE	253	static char program[] = "program";
	254	static char p[] = "-p";
	255	static char foo[] = "foo";
	256	static char bar[] = "bar";
	257	char *argv[] = { program, p, foo, bar, NULL };
e275c824 PE	258
	259	optind = 1;
	260	if (getopt (4, argv, "p::") != 'p')
	261	result \|= 2;
	262	else if (optarg != NULL)
	263	result \|= 4;
	264	else if (getopt (4, argv, "p::") != -1)
	265	result \|= 6;
	266	else if (optind != 2)
	267	result \|= 8;
	268	}
	269	/* This code succeeds on glibc 2.8 and fails on Cygwin 1.7.0. */
	270	{
4a621aae PE	271	static char program[] = "program";
	272	static char foo[] = "foo";
	273	static char p[] = "-p";
	274	char *argv[] = { program, foo, p, NULL };
e275c824 PE	275	optind = 0;
	276	if (getopt (3, argv, "-p") != 1)
	277	result \|= 16;
	278	else if (getopt (3, argv, "-p") != 'p')
05730648	279	result \|= 16;
e275c824 PE	280	}
	281	/* This code fails on glibc 2.11. */
	282	{
4a621aae PE	283	static char program[] = "program";
	284	static char b[] = "-b";
	285	static char a[] = "-a";
	286	char *argv[] = { program, b, a, NULL };
e275c824 PE	287	optind = opterr = 0;
e275c824 PE	288	if (getopt (3, argv, "+:a:b") != 'b')
05730648	289	result \|= 32;
e275c824	290	else if (getopt (3, argv, "+:a:b") != ':')
05730648	291	result \|= 32;
e275c824	292	}
4a621aae PE	293	/* This code dumps core on glibc 2.14. */
	294	{
	295	static char program[] = "program";
	296	static char w[] = "-W";
	297	static char dummy[] = "dummy";
	298	char *argv[] = { program, w, dummy, NULL };
	299	optind = opterr = 1;
	300	if (getopt (3, argv, "W;") != 'W')
05730648	301	result \|= 64;
4a621aae	302	}
e275c824 PE	303	return result;
	304	]])],
	305	[gl_cv_func_getopt_gnu=yes],
	306	[gl_cv_func_getopt_gnu=no],
	307	[dnl Cross compiling. Guess based on host and declarations.
	308	case $host_os:$ac_cv_have_decl_optreset in
	309	-gnu:* \| mingw:) gl_cv_func_getopt_gnu=no;;
	310	*:yes) gl_cv_func_getopt_gnu=no;;
	311	*) gl_cv_func_getopt_gnu=yes;;
	312	esac
	313	])
	314	case $gl_had_POSIXLY_CORRECT in
	315	exported) ;;
	316	yes) AS_UNSET([POSIXLY_CORRECT]); POSIXLY_CORRECT=1 ;;
	317	*) AS_UNSET([POSIXLY_CORRECT]) ;;
	318	esac
	319	])
	320	if test "$gl_cv_func_getopt_gnu" = "no"; then
	321	gl_replace_getopt=yes
47d0c011 PE	322	else
	323	AC_CACHE_CHECK([for working GNU getopt_long function],
	324	[gl_cv_func_getopt_long_gnu],
	325	[AC_RUN_IFELSE(
	326	[AC_LANG_PROGRAM(
	327	[[#include <getopt.h>
	328	#include <stddef.h>
	329	#include <string.h>
	330	]],
	331	[[static const struct option long_options[] =
	332	{
	333	{ "xtremely-",no_argument, NULL, 1003 },
	334	{ "xtra", no_argument, NULL, 1001 },
	335	{ "xtreme", no_argument, NULL, 1002 },
	336	{ "xtremely", no_argument, NULL, 1003 },
	337	{ NULL, 0, NULL, 0 }
	338	};
	339	/* This code fails on OpenBSD 5.0. */
	340	{
	341	static char program[] = "program";
	342	static char xtremel[] = "--xtremel";
	343	char *argv[] = { program, xtremel, NULL };
	344	int option_index;
	345	optind = 1; opterr = 0;
	346	if (getopt_long (2, argv, "", long_options, &option_index) != 1003)
	347	return 1;
	348	}
	349	return 0;
	350	]])],
	351	[gl_cv_func_getopt_long_gnu=yes],
	352	[gl_cv_func_getopt_long_gnu=no],
	353	[dnl Cross compiling. Guess no on OpenBSD, yes otherwise.
	354	case "$host_os" in
	355	openbsd*) gl_cv_func_getopt_long_gnu="guessing no";;
	356	*) gl_cv_func_getopt_long_gnu="guessing yes";;
	357	esac
	358	])
	359	])
	360	case "$gl_cv_func_getopt_long_gnu" in
	361	*yes) ;;
	362	*) gl_replace_getopt=yes ;;
	363	esac
9eff9fe3 PE	364	fi
	365	fi
	366	])
	367
e275c824 PE	368	# emacs' configure.in uses this.
e275c824 PE	369	AC_DEFUN([gl_GETOPT_SUBSTITUTE_HEADER],
9eff9fe3	370	[
e275c824 PE	371	GETOPT_H=getopt.h
	372	AC_DEFINE([__GETOPT_PREFIX], [[rpl_]],
	373	[Define to rpl_ if the getopt replacement functions and variables
	374	should be used.])
	375	AC_SUBST([GETOPT_H])
9eff9fe3 PE	376	])
9eff9fe3 PE	377
9eff9fe3	378	# Prerequisites of lib/getopt*.
e275c824 PE	379	# emacs' configure.in uses this.
	380	AC_DEFUN([gl_PREREQ_GETOPT],
	381	[
	382	AC_CHECK_DECLS_ONCE([getenv])
	383	])