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annotate m4/glob.m4 @ 5986:f84b6f02ec36

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* m4/glob.m4 (gl_GLOB): Cache glob interface check result. Add check for glob symlink bug.
author Derek R. Price <derek@ximbiot.com>
date Thu, 14 Jul 2005 14:45:40 +0000
parents fade30172414
children 3abf83a68fce
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429b55c14554 * MODULES.html.sh: Add glob to Enhanced POSIX.2001 section.
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1 # glob.m4 serial 1
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2 dnl Copyright (C) 2005 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 # The glob module assumes you want GNU glob, with glob_pattern_p etc,
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8 # rather than vanilla POSIX glob. This means your your code should
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9 # always include <glob.h> for the glob prototypes.
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10
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11 AC_DEFUN([gl_GLOB_SUBSTITUTE],
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12 [
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13 gl_PREREQ_GLOB
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14
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15 GLOB_H=glob.h
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16 AC_LIBOBJ([glob])
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17 AC_DEFINE([GLOB_PREFIX], [[rpl_]],
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18 [Define to rpl_ if the glob replacement functions and variables
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19 should be used.])
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20 AC_SUBST([GLOB_H])
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21 ])
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22
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23 AC_DEFUN([gl_GLOB],
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24 [ GLOB_H=
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25 AC_CHECK_HEADERS([glob.h], [], [GLOB_H=glob.h])
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26
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27 if test -z "$GLOB_H"; then
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28 AC_CACHE_CHECK([for GNU glob interface version 1],
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29 [gl_cv_gnu_glob_interface_version_1],
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30 [ AC_COMPILE_IFELSE(
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31 [[#include <gnu-versions.h>
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32 char a[_GNU_GLOB_INTERFACE_VERSION == 1 ? 1 : -1];]],
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33 [gl_cv_gnu_glob_interface_version_1=yes],
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34 [gl_cv_gnu_glob_interface_version_1=no])])
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35
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36 if test "$gl_cv_gnu_glob_interface_version_1" = "no"; then
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37 GLOB_H=glob.h
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38 fi
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39 fi
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40
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41 if test -z "$GLOB_H"; then
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42 AC_CACHE_CHECK([whether glob lists broken symlinks],
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43 [gl_cv_glob_lists_symlinks],
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44 [ if ln -s conf-doesntexist conf$$-globtest 2>/dev/null; then
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45 gl_cv_glob_lists_symlinks=maybe
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46 else
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47 # If we can't make a symlink, then we cannot test this issue. Be
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48 # pessimistic about this.
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49 gl_cv_glob_lists_symlinks=no
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50 fi
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f84b6f02ec36 * m4/glob.m4 (gl_GLOB): Cache glob interface check result. Add check for
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52 if test $gl_cv_glob_lists_symlinks = maybe; then
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53 AC_RUN_IFELSE(
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54 AC_LANG_PROGRAM(
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55 [[#include <stddef.h>
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56 #include <glob.h>]],
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57 [[glob_t found;
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58 if (glob ("conf*-globtest", 0, NULL, &found) == GLOB_NOMATCH) return 1;]]),
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59 [gl_cv_glob_lists_symlinks=yes],
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60 [gl_cv_glob_lists_symlinks=no], [gl_cv_glob_lists_symlinks=no])
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61 fi])
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62
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63 if test $gl_cv_glob_lists_symlinks = no; then
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64 GLOB_H=glob.h
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65 fi
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68 rm -f conf$$-globtest
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69
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70 if test -n "$GLOB_H"; then
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71 gl_GLOB_SUBSTITUTE
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72 fi
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73 ])
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74
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75 # Prerequisites of lib/glob.*.
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76 AC_DEFUN([gl_PREREQ_GLOB],
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77 [ AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_TYPE])dnl
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78 AC_REQUIRE([AC_HEADER_DIRENT])dnl
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79 AC_CHECK_HEADERS_ONCE([sys/cdefs.h unistd.h])dnl
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80 AC_CHECK_FUNCS_ONCE([getlogin_r getpwnam_r])dnl
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81 AC_CHECK_HEADERS([sys/cdefs.h], [SYS_CDEFS_H=yes], [SYS_CDEFS_H=no])
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82
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83 dnl Note the reversal of the common HAVE_SYS_CDEFS_H idiom below. In this
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84 dnl way, #ifndef _SYS_CDEFS_H may be used to include <sys/cdefs.h> both when
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85 dnl it has been checked for via the GNULIB configure test and found and when
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86 dnl it has not been checked for, which we can presume means that the <glob.h>
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87 dnl GNULIB shares with GLIBC is being included as a system header and not as
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88 dnl part of GNULIB, in which case <sys/cdefs.h> may be assumed.
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89 if test $SYS_CDEFS_H = no; then
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90 AC_DEFINE(_SYS_CDEFS_H, 1,
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91 [Define to `1' if <sys/cdefs.h> is *not* available on this system.])
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92 fi
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93 :])