m4/getopt.m4

   1 # getopt.m4 serial 38
   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 option
  93         dnl processing.  Existence of the optreset 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_LINK_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     static char program[] = "program";
 125     static char a[] = "-a";
 126     static char foo[] = "foo";
 127     static char bar[] = "bar";
 128     char *argv[] = { program, a, foo, bar, NULL };
 129     int c;
 130
 131     optind = OPTIND_MIN;
 132     opterr = 0;
 133
 134     c = getopt (4, argv, "ab");
 135     if (!(c == 'a'))
 136       return 1;
 137     c = getopt (4, argv, "ab");
 138     if (!(c == -1))
 139       return 2;
 140     if (!(optind == 2))
 141       return 3;
 142   }
 143   /* Some internal state exists at this point.  */
 144   {
 145     static char program[] = "program";
 146     static char donald[] = "donald";
 147     static char p[] = "-p";
 148     static char billy[] = "billy";
 149     static char duck[] = "duck";
 150     static char a[] = "-a";
 151     static char bar[] = "bar";
 152     char *argv[] = { program, donald, p, billy, duck, a, bar, NULL };
 153     int c;
 154
 155     optind = OPTIND_MIN;
 156     opterr = 0;
 157
 158     c = getopt (7, argv, "+abp:q:");
 159     if (!(c == -1))
 160       return 4;
 161     if (!(strcmp (argv[0], "program") == 0))
 162       return 5;
 163     if (!(strcmp (argv[1], "donald") == 0))
 164       return 6;
 165     if (!(strcmp (argv[2], "-p") == 0))
 166       return 7;
 167     if (!(strcmp (argv[3], "billy") == 0))
 168       return 8;
 169     if (!(strcmp (argv[4], "duck") == 0))
 170       return 9;
 171     if (!(strcmp (argv[5], "-a") == 0))
 172       return 10;
 173     if (!(strcmp (argv[6], "bar") == 0))
 174       return 11;
 175     if (!(optind == 1))
 176       return 12;
 177   }
 178   /* Detect MacOS 10.5, AIX 7.1 bug.  */
 179   {
 180     static char program[] = "program";
 181     static char ab[] = "-ab";
 182     char *argv[3] = { program, ab, NULL };
 183     optind = OPTIND_MIN;
 184     opterr = 0;
 185     if (getopt (2, argv, "ab:") != 'a')
 186       return 13;
 187     if (getopt (2, argv, "ab:") != '?')
 188       return 14;
 189     if (optopt != 'b')
 190       return 15;
 191     if (optind != 2)
 192       return 16;
 193   }
 194
 195   return 0;
 196 }
 197 ]])],
 198           [gl_cv_func_getopt_posix=yes], [gl_cv_func_getopt_posix=no],
 199           [case "$host_os" in
 200              mingw*)         gl_cv_func_getopt_posix="guessing no";;
 201              darwin* | aix*) gl_cv_func_getopt_posix="guessing no";;
 202              *)              gl_cv_func_getopt_posix="guessing yes";;
 203            esac
 204           ])
 205         CPPFLAGS=$gl_save_CPPFLAGS
 206       ])
 207     case "$gl_cv_func_getopt_posix" in
 208       *no) gl_replace_getopt=yes ;;
 209     esac
 210   fi
 211
 212   if test -z "$gl_replace_getopt" && test $gl_getopt_required = GNU; then
 213     AC_CACHE_CHECK([for working GNU getopt function], [gl_cv_func_getopt_gnu],
 214       [# Even with POSIXLY_CORRECT, the GNU extension of leading '-' in the
 215        # optstring is necessary for programs like m4 that have POSIX-mandated
 216        # semantics for supporting options interspersed with files.
 217        # Also, since getopt_long is a GNU extension, we require optind=0.
 218        # Bash ties 'set -o posix' to a non-exported POSIXLY_CORRECT;
 219        # so take care to revert to the correct (non-)export state.
 220 dnl GNU Coding Standards currently allow awk but not env; besides, env
 221 dnl is ambiguous with environment values that contain newlines.
 222        gl_awk_probe='BEGIN { if ("POSIXLY_CORRECT" in ENVIRON) print "x" }'
 223        case ${POSIXLY_CORRECT+x}`$AWK "$gl_awk_probe" </dev/null` in
 224          xx) gl_had_POSIXLY_CORRECT=exported ;;
 225          x)  gl_had_POSIXLY_CORRECT=yes      ;;
 226          *)  gl_had_POSIXLY_CORRECT=         ;;
 227        esac
 228        POSIXLY_CORRECT=1
 229        export POSIXLY_CORRECT
 230        AC_RUN_IFELSE(
 231         [AC_LANG_PROGRAM([[#include <getopt.h>
 232                            #include <stddef.h>
 233                            #include <string.h>
 234            ]GL_NOCRASH[
 235            ]], [[
 236              int result = 0;
 237
 238              nocrash_init();
 239
 240              /* This code succeeds on glibc 2.8, OpenBSD 4.0, Cygwin, mingw,
 241                 and fails on MacOS X 10.5, AIX 5.2, HP-UX 11, IRIX 6.5,
 242                 OSF/1 5.1, Solaris 10.  */
 243              {
 244                static char conftest[] = "conftest";
 245                static char plus[] = "-+";
 246                char *argv[3] = { conftest, plus, NULL };
 247                opterr = 0;
 248                if (getopt (2, argv, "+a") != '?')
 249                  result |= 1;
 250              }
 251              /* This code succeeds on glibc 2.8, mingw,
 252                 and fails on MacOS X 10.5, OpenBSD 4.0, AIX 5.2, HP-UX 11,
 253                 IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x.  */
 254              {
 255                static char program[] = "program";
 256                static char p[] = "-p";
 257                static char foo[] = "foo";
 258                static char bar[] = "bar";
 259                char *argv[] = { program, p, foo, bar, NULL };
 260
 261                optind = 1;
 262                if (getopt (4, argv, "p::") != 'p')
 263                  result |= 2;
 264                else if (optarg != NULL)
 265                  result |= 4;
 266                else if (getopt (4, argv, "p::") != -1)
 267                  result |= 6;
 268                else if (optind != 2)
 269                  result |= 8;
 270              }
 271              /* This code succeeds on glibc 2.8 and fails on Cygwin 1.7.0.  */
 272              {
 273                static char program[] = "program";
 274                static char foo[] = "foo";
 275                static char p[] = "-p";
 276                char *argv[] = { program, foo, p, NULL };
 277                optind = 0;
 278                if (getopt (3, argv, "-p") != 1)
 279                  result |= 16;
 280                else if (getopt (3, argv, "-p") != 'p')
 281                  result |= 32;
 282              }
 283              /* This code fails on glibc 2.11.  */
 284              {
 285                static char program[] = "program";
 286                static char b[] = "-b";
 287                static char a[] = "-a";
 288                char *argv[] = { program, b, a, NULL };
 289                optind = opterr = 0;
 290                if (getopt (3, argv, "+:a:b") != 'b')
 291                  result |= 64;
 292                else if (getopt (3, argv, "+:a:b") != ':')
 293                  result |= 64;
 294              }
 295              /* This code dumps core on glibc 2.14.  */
 296              {
 297                static char program[] = "program";
 298                static char w[] = "-W";
 299                static char dummy[] = "dummy";
 300                char *argv[] = { program, w, dummy, NULL };
 301                optind = opterr = 1;
 302                if (getopt (3, argv, "W;") != 'W')
 303                  result |= 128;
 304              }
 305              return result;
 306            ]])],
 307         [gl_cv_func_getopt_gnu=yes],
 308         [gl_cv_func_getopt_gnu=no],
 309         [dnl Cross compiling. Guess based on host and declarations.
 310          case $host_os:$ac_cv_have_decl_optreset in
 311            *-gnu*:* | mingw*:*) gl_cv_func_getopt_gnu=no;;
 312            *:yes)               gl_cv_func_getopt_gnu=no;;
 313            *)                   gl_cv_func_getopt_gnu=yes;;
 314          esac
 315         ])
 316        case $gl_had_POSIXLY_CORRECT in
 317          exported) ;;
 318          yes) AS_UNSET([POSIXLY_CORRECT]); POSIXLY_CORRECT=1 ;;
 319          *) AS_UNSET([POSIXLY_CORRECT]) ;;
 320        esac
 321       ])
 322     if test "$gl_cv_func_getopt_gnu" = "no"; then
 323       gl_replace_getopt=yes
 324     fi
 325   fi
 326 ])
 327
 328 # emacs' configure.in uses this.
 329 AC_DEFUN([gl_GETOPT_SUBSTITUTE_HEADER],
 330 [
 331   GETOPT_H=getopt.h
 332   AC_DEFINE([__GETOPT_PREFIX], [[rpl_]],
 333     [Define to rpl_ if the getopt replacement functions and variables
 334      should be used.])
 335   AC_SUBST([GETOPT_H])
 336 ])
 337
 338 # Prerequisites of lib/getopt*.
 339 # emacs' configure.in uses this.
 340 AC_DEFUN([gl_PREREQ_GETOPT],
 341 [
 342   AC_CHECK_DECLS_ONCE([getenv])
 343 ])