gnulib/import/m4/canonicalize.m4

   1 # canonicalize.m4 serial 28
   2
   3 dnl Copyright (C) 2003-2007, 2009-2016 Free Software Foundation, Inc.
   4
   5 dnl This file is free software; the Free Software Foundation
   6 dnl gives unlimited permission to copy and/or distribute it,
   7 dnl with or without modifications, as long as this notice is preserved.
   8
   9 # Provides canonicalize_file_name and canonicalize_filename_mode, but does
  10 # not provide or fix realpath.
  11 AC_DEFUN([gl_FUNC_CANONICALIZE_FILENAME_MODE],
  12 [
  13   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  14   AC_CHECK_FUNCS_ONCE([canonicalize_file_name])
  15   AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
  16   AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
  17   if test $ac_cv_func_canonicalize_file_name = no; then
  18     HAVE_CANONICALIZE_FILE_NAME=0
  19   else
  20     case "$gl_cv_func_realpath_works" in
  21       *yes) ;;
  22       *)    REPLACE_CANONICALIZE_FILE_NAME=1 ;;
  23     esac
  24   fi
  25 ])
  26
  27 # Provides canonicalize_file_name and realpath.
  28 AC_DEFUN([gl_CANONICALIZE_LGPL],
  29 [
  30   AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
  31   AC_REQUIRE([gl_CANONICALIZE_LGPL_SEPARATE])
  32   if test $ac_cv_func_canonicalize_file_name = no; then
  33     HAVE_CANONICALIZE_FILE_NAME=0
  34     if test $ac_cv_func_realpath = no; then
  35       HAVE_REALPATH=0
  36     else
  37       case "$gl_cv_func_realpath_works" in
  38         *yes) ;;
  39         *)    REPLACE_REALPATH=1 ;;
  40       esac
  41     fi
  42   else
  43     case "$gl_cv_func_realpath_works" in
  44       *yes)
  45         ;;
  46       *)
  47         REPLACE_CANONICALIZE_FILE_NAME=1
  48         REPLACE_REALPATH=1
  49         ;;
  50     esac
  51   fi
  52 ])
  53
  54 # Like gl_CANONICALIZE_LGPL, except prepare for separate compilation
  55 # (no REPLACE_CANONICALIZE_FILE_NAME, no REPLACE_REALPATH, no AC_LIBOBJ).
  56 AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE],
  57 [
  58   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  59   AC_CHECK_FUNCS_ONCE([canonicalize_file_name getcwd readlink])
  60   AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
  61   AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
  62   AC_CHECK_HEADERS_ONCE([sys/param.h])
  63 ])
  64
  65 # Check whether realpath works.  Assume that if a platform has both
  66 # realpath and canonicalize_file_name, but the former is broken, then
  67 # so is the latter.
  68 AC_DEFUN([gl_FUNC_REALPATH_WORKS],
  69 [
  70   AC_CHECK_FUNCS_ONCE([realpath])
  71   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  72   AC_CACHE_CHECK([whether realpath works], [gl_cv_func_realpath_works], [
  73     touch conftest.a
  74     mkdir conftest.d
  75     AC_RUN_IFELSE([
  76       AC_LANG_PROGRAM([[
  77         ]GL_NOCRASH[
  78         #include <stdlib.h>
  79         #include <string.h>
  80       ]], [[
  81         int result = 0;
  82         {
  83           char *name = realpath ("conftest.a", NULL);
  84           if (!(name && *name == '/'))
  85             result |= 1;
  86           free (name);
  87         }
  88         {
  89           char *name = realpath ("conftest.b/../conftest.a", NULL);
  90           if (name != NULL)
  91             result |= 2;
  92           free (name);
  93         }
  94         {
  95           char *name = realpath ("conftest.a/", NULL);
  96           if (name != NULL)
  97             result |= 4;
  98           free (name);
  99         }
 100         {
 101           char *name1 = realpath (".", NULL);
 102           char *name2 = realpath ("conftest.d//./..", NULL);
 103           if (! name1 || ! name2 || strcmp (name1, name2))
 104             result |= 8;
 105           free (name1);
 106           free (name2);
 107         }
 108         return result;
 109       ]])
 110      ],
 111      [gl_cv_func_realpath_works=yes],
 112      [gl_cv_func_realpath_works=no],
 113      [case "$host_os" in
 114                        # Guess yes on glibc systems.
 115         *-gnu* | gnu*) gl_cv_func_realpath_works="guessing yes" ;;
 116                        # If we don't know, assume the worst.
 117         *)             gl_cv_func_realpath_works="guessing no" ;;
 118       esac
 119      ])
 120     rm -rf conftest.a conftest.d
 121   ])
 122   case "$gl_cv_func_realpath_works" in
 123     *yes)
 124       AC_DEFINE([FUNC_REALPATH_WORKS], [1], [Define to 1 if realpath()
 125         can malloc memory, always gives an absolute path, and handles
 126         trailing slash correctly.])
 127       ;;
 128   esac
 129 ])