code.delx.au - gnu-emacs/blob - m4/getopt.m4

   1 # getopt.m4 serial 35
   2 dnl Copyright (C) 2002-2006, 2008-2011 Free Software Foundation, Inc.
   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
   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])
  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 $REPLACE_GETOPT = 1; then
  26     dnl Arrange for getopt.h to be created.
  27     gl_GETOPT_SUBSTITUTE_HEADER
  28     dnl Arrange for unistd.h to include getopt.h.
  29     GNULIB_UNISTD_H_GETOPT=1
  30   fi
  31 ])
  32
  33 # Request a POSIX compliant getopt function with GNU extensions (such as
  34 # options with optional arguments) and the functions getopt_long,
  35 # getopt_long_only.
  36 AC_DEFUN([gl_FUNC_GETOPT_GNU],
  37 [
  38   m4_divert_text([INIT_PREPARE], [gl_getopt_required=GNU])
  39
  40   AC_REQUIRE([gl_FUNC_GETOPT_POSIX])
  41 ])
  42
  43 # emacs' configure.in uses this.
  44 AC_DEFUN([gl_GETOPT_IFELSE],
  45 [
  46   AC_REQUIRE([gl_GETOPT_CHECK_HEADERS])
  47   AS_IF([test -n "$gl_replace_getopt"], [$1], [$2])
  48 ])
  49
  50 # Determine whether to replace the entire getopt facility.
  51 AC_DEFUN([gl_GETOPT_CHECK_HEADERS],
  52 [
  53   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  54   AC_REQUIRE([AC_PROG_AWK]) dnl for awk that supports ENVIRON
  55
  56   dnl Persuade Solaris <unistd.h> to declare optarg, optind, opterr, optopt.
  57   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
  58
  59   gl_CHECK_NEXT_HEADERS([getopt.h])
  60   if test $ac_cv_header_getopt_h = yes; then
  61     HAVE_GETOPT_H=1
  62   else
  63     HAVE_GETOPT_H=0
  64   fi
  65   AC_SUBST([HAVE_GETOPT_H])
  66
  67   gl_replace_getopt=
  68
  69   dnl Test whether <getopt.h> is available.
  70   if test -z "$gl_replace_getopt" && test $gl_getopt_required = GNU; then
  71     AC_CHECK_HEADERS([getopt.h], [], [gl_replace_getopt=yes])
  72   fi
  73
  74   dnl Test whether the function getopt_long is available.
  75   if test -z "$gl_replace_getopt" && test $gl_getopt_required = GNU; then
  76     AC_CHECK_FUNCS([getopt_long_only], [], [gl_replace_getopt=yes])
  77   fi
  78
  79   dnl mingw's getopt (in libmingwex.a) does weird things when the options
  80   dnl strings starts with '+' and it's not the first call.  Some internal state
  81   dnl is left over from earlier calls, and neither setting optind = 0 nor
  82   dnl setting optreset = 1 get rid of this internal state.
  83   dnl POSIX is silent on optind vs. optreset, so we allow either behavior.
  84   dnl POSIX 2008 does not specify leading '+' behavior, but see
  85   dnl http://austingroupbugs.net/view.php?id=191 for a recommendation on
  86   dnl the next version of POSIX.  For now, we only guarantee leading '+'
  87   dnl behavior with getopt-gnu.
  88   if test -z "$gl_replace_getopt"; then
  89     AC_CACHE_CHECK([whether getopt is POSIX compatible],
  90       [gl_cv_func_getopt_posix],
  91       [
  92         dnl BSD getopt_long uses an incompatible method to reset
  93         dnl option processing.  Existence of the variable, in and of
  94         dnl itself, is not a reason to replace getopt, but knowledge
  95         dnl of the variable is needed to determine how to reset and
  96         dnl whether a reset reparses the environment.  Solaris
  97         dnl supports neither optreset nor optind=0, but keeps no state
  98         dnl that needs a reset beyond setting optind=1; detect Solaris
  99         dnl by getopt_clip.
 100         AC_COMPILE_IFELSE(
 101           [AC_LANG_PROGRAM(
 102              [[#include <unistd.h>]],
 103              [[int *p = &optreset; return optreset;]])],
 104           [gl_optind_min=1],
 105           [AC_COMPILE_IFELSE(
 106              [AC_LANG_PROGRAM(
 107                 [[#include <getopt.h>]],
 108                 [[return !getopt_clip;]])],
 109              [gl_optind_min=1],
 110              [gl_optind_min=0])])
 111
 112         dnl This test fails on mingw and succeeds on many other platforms.
 113         gl_save_CPPFLAGS=$CPPFLAGS
 114         CPPFLAGS="$CPPFLAGS -DOPTIND_MIN=$gl_optind_min"
 115         AC_RUN_IFELSE([AC_LANG_SOURCE([[
 116 #include <unistd.h>
 117 #include <stdlib.h>
 118 #include <string.h>
 119
 120 int
 121 main ()
 122 {
 123   {
 124     int argc = 0;
 125     char *argv[10];
 126     int c;
 127
 128     argv[argc++] = "program";
 129     argv[argc++] = "-a";
 130     argv[argc++] = "foo";
 131     argv[argc++] = "bar";
 132     argv[argc] = NULL;
 133     optind = OPTIND_MIN;
 134     opterr = 0;
 135
 136     c = getopt (argc, argv, "ab");
 137     if (!(c == 'a'))
 138       return 1;
 139     c = getopt (argc, argv, "ab");
 140     if (!(c == -1))
 141       return 2;
 142     if (!(optind == 2))
 143       return 3;
 144   }
 145   /* Some internal state exists at this point.  */
 146   {
 147     int argc = 0;
 148     char *argv[10];
 149     int c;
 150
 151     argv[argc++] = "program";
 152     argv[argc++] = "donald";
 153     argv[argc++] = "-p";
 154     argv[argc++] = "billy";
 155     argv[argc++] = "duck";
 156     argv[argc++] = "-a";
 157     argv[argc++] = "bar";
 158     argv[argc] = NULL;
 159     optind = OPTIND_MIN;
 160     opterr = 0;
 161
 162     c = getopt (argc, argv, "+abp:q:");
 163     if (!(c == -1))
 164       return 4;
 165     if (!(strcmp (argv[0], "program") == 0))
 166       return 5;
 167     if (!(strcmp (argv[1], "donald") == 0))
 168       return 6;
 169     if (!(strcmp (argv[2], "-p") == 0))
 170       return 7;
 171     if (!(strcmp (argv[3], "billy") == 0))
 172       return 8;
 173     if (!(strcmp (argv[4], "duck") == 0))
 174       return 9;
 175     if (!(strcmp (argv[5], "-a") == 0))
 176       return 10;
 177     if (!(strcmp (argv[6], "bar") == 0))
 178       return 11;
 179     if (!(optind == 1))
 180       return 12;
 181   }
 182   /* Detect MacOS 10.5, AIX 7.1 bug.  */
 183   {
 184     char *argv[3] = { "program", "-ab", NULL };
 185     optind = OPTIND_MIN;
 186     opterr = 0;
 187     if (getopt (2, argv, "ab:") != 'a')
 188       return 13;
 189     if (getopt (2, argv, "ab:") != '?')
 190       return 14;
 191     if (optopt != 'b')
 192       return 15;
 193     if (optind != 2)
 194       return 16;
 195   }
 196
 197   return 0;
 198 }
 199 ]])],
 200           [gl_cv_func_getopt_posix=yes], [gl_cv_func_getopt_posix=no],
 201           [case "$host_os" in
 202              mingw*)         gl_cv_func_getopt_posix="guessing no";;
 203              darwin* | aix*) gl_cv_func_getopt_posix="guessing no";;
 204              *)              gl_cv_func_getopt_posix="guessing yes";;
 205            esac
 206           ])
 207         CPPFLAGS=$gl_save_CPPFLAGS
 208       ])
 209     case "$gl_cv_func_getopt_posix" in
 210       *no) gl_replace_getopt=yes ;;
 211     esac
 212   fi
 213
 214   if test -z "$gl_replace_getopt" && test $gl_getopt_required = GNU; then
 215     AC_CACHE_CHECK([for working GNU getopt function], [gl_cv_func_getopt_gnu],
 216       [# Even with POSIXLY_CORRECT, the GNU extension of leading '-' in the
 217        # optstring is necessary for programs like m4 that have POSIX-mandated
 218        # semantics for supporting options interspersed with files.
 219        # Also, since getopt_long is a GNU extension, we require optind=0.
 220        # Bash ties 'set -o posix' to a non-exported POSIXLY_CORRECT;
 221        # so take care to revert to the correct (non-)export state.
 222 dnl GNU Coding Standards currently allow awk but not env; besides, env
 223 dnl is ambiguous with environment values that contain newlines.
 224        gl_awk_probe='BEGIN { if ("POSIXLY_CORRECT" in ENVIRON) print "x" }'
 225        case ${POSIXLY_CORRECT+x}`$AWK "$gl_awk_probe" </dev/null` in
 226          xx) gl_had_POSIXLY_CORRECT=exported ;;
 227          x)  gl_had_POSIXLY_CORRECT=yes      ;;
 228          *)  gl_had_POSIXLY_CORRECT=         ;;
 229        esac
 230        POSIXLY_CORRECT=1
 231        export POSIXLY_CORRECT
 232        AC_RUN_IFELSE(
 233         [AC_LANG_PROGRAM([[#include <getopt.h>
 234                            #include <stddef.h>
 235                            #include <string.h>
 236            ]], [[
 237              int result = 0;
 238              /* This code succeeds on glibc 2.8, OpenBSD 4.0, Cygwin, mingw,
 239                 and fails on MacOS X 10.5, AIX 5.2, HP-UX 11, IRIX 6.5,
 240                 OSF/1 5.1, Solaris 10.  */
 241              {
 242                char *myargv[3];
 243                myargv[0] = "conftest";
 244                myargv[1] = "-+";
 245                myargv[2] = 0;
 246                opterr = 0;
 247                if (getopt (2, myargv, "+a") != '?')
 248                  result |= 1;
 249              }
 250              /* This code succeeds on glibc 2.8, mingw,
 251                 and fails on MacOS X 10.5, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 252                 IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x.  */
 253              {
 254                char *argv[] = { "program", "-p", "foo", "bar", NULL };
 255
 256                optind = 1;
 257                if (getopt (4, argv, "p::") != 'p')
 258                  result |= 2;
 259                else if (optarg != NULL)
 260                  result |= 4;
 261                else if (getopt (4, argv, "p::") != -1)
 262                  result |= 6;
 263                else if (optind != 2)
 264                  result |= 8;
 265              }
 266              /* This code succeeds on glibc 2.8 and fails on Cygwin 1.7.0.  */
 267              {
 268                char *argv[] = { "program", "foo", "-p", NULL };
 269                optind = 0;
 270                if (getopt (3, argv, "-p") != 1)
 271                  result |= 16;
 272                else if (getopt (3, argv, "-p") != 'p')
 273                  result |= 32;
 274              }
 275              /* This code fails on glibc 2.11.  */
 276              {
 277                char *argv[] = { "program", "-b", "-a", NULL };
 278                optind = opterr = 0;
 279                if (getopt (3, argv, "+:a:b") != 'b')
 280                  result |= 64;
 281                else if (getopt (3, argv, "+:a:b") != ':')
 282                  result |= 64;
 283              }
 284              return result;
 285            ]])],
 286         [gl_cv_func_getopt_gnu=yes],
 287         [gl_cv_func_getopt_gnu=no],
 288         [dnl Cross compiling. Guess based on host and declarations.
 289          case $host_os:$ac_cv_have_decl_optreset in
 290            *-gnu*:* | mingw*:*) gl_cv_func_getopt_gnu=no;;
 291            *:yes)               gl_cv_func_getopt_gnu=no;;
 292            *)                   gl_cv_func_getopt_gnu=yes;;
 293          esac
 294         ])
 295        case $gl_had_POSIXLY_CORRECT in
 296          exported) ;;
 297          yes) AS_UNSET([POSIXLY_CORRECT]); POSIXLY_CORRECT=1 ;;
 298          *) AS_UNSET([POSIXLY_CORRECT]) ;;
 299        esac
 300       ])
 301     if test "$gl_cv_func_getopt_gnu" = "no"; then
 302       gl_replace_getopt=yes
 303     fi
 304   fi
 305 ])
 306
 307 # emacs' configure.in uses this.
 308 AC_DEFUN([gl_GETOPT_SUBSTITUTE_HEADER],
 309 [
 310   GETOPT_H=getopt.h
 311   AC_DEFINE([__GETOPT_PREFIX], [[rpl_]],
 312     [Define to rpl_ if the getopt replacement functions and variables
 313      should be used.])
 314   AC_SUBST([GETOPT_H])
 315 ])
 316
 317 # Prerequisites of lib/getopt*.
 318 # emacs' configure.in uses this.
 319 AC_DEFUN([gl_PREREQ_GETOPT],
 320 [
 321   AC_CHECK_DECLS_ONCE([getenv])
 322 ])