m4/canonicalize.m4

   1 # canonicalize.m4 serial 23
   2
   3 dnl Copyright (C) 2003-2007, 2009-2011 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 $ac_cv_func_canonicalize_file_name = no; then
  18     HAVE_CANONICALIZE_FILE_NAME=0
  19   elif test "$gl_cv_func_realpath_works" != yes; then
  20     REPLACE_CANONICALIZE_FILE_NAME=1
  21   fi
  22 ])
  23
  24 # Provides canonicalize_file_name and realpath.
  25 AC_DEFUN([gl_CANONICALIZE_LGPL],
  26 [
  27   AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
  28   AC_REQUIRE([gl_CANONICALIZE_LGPL_SEPARATE])
  29   if test $ac_cv_func_canonicalize_file_name = no; then
  30     HAVE_CANONICALIZE_FILE_NAME=0
  31     if test $ac_cv_func_realpath = no; then
  32       HAVE_REALPATH=0
  33     elif test "$gl_cv_func_realpath_works" != yes; then
  34       REPLACE_REALPATH=1
  35     fi
  36   elif test "$gl_cv_func_realpath_works" != yes; then
  37     REPLACE_CANONICALIZE_FILE_NAME=1
  38     REPLACE_REALPATH=1
  39   fi
  40 ])
  41
  42 # Like gl_CANONICALIZE_LGPL, except prepare for separate compilation
  43 # (no REPLACE_CANONICALIZE_FILE_NAME, no REPLACE_REALPATH, no AC_LIBOBJ).
  44 AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE],
  45 [
  46   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  47   AC_CHECK_FUNCS_ONCE([canonicalize_file_name getcwd readlink])
  48   AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
  49   AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
  50   AC_CHECK_HEADERS_ONCE([sys/param.h])
  51 ])
  52
  53 # Check whether realpath works.  Assume that if a platform has both
  54 # realpath and canonicalize_file_name, but the former is broken, then
  55 # so is the latter.
  56 AC_DEFUN([gl_FUNC_REALPATH_WORKS],
  57 [
  58   AC_CHECK_FUNCS_ONCE([realpath])
  59   AC_CACHE_CHECK([whether realpath works], [gl_cv_func_realpath_works], [
  60     touch conftest.a
  61     mkdir conftest.d
  62     AC_RUN_IFELSE([
  63       AC_LANG_PROGRAM([[
  64         ]GL_NOCRASH[
  65         #include <stdlib.h>
  66         #include <string.h>
  67       ]], [[
  68         int result = 0;
  69         {
  70           char *name = realpath ("conftest.a", NULL);
  71           if (!(name && *name == '/'))
  72             result |= 1;
  73         }
  74         {
  75           char *name = realpath ("conftest.b/../conftest.a", NULL);
  76           if (name != NULL)
  77             result |= 2;
  78         }
  79         {
  80           char *name = realpath ("conftest.a/", NULL);
  81           if (name != NULL)
  82             result |= 4;
  83         }
  84         {
  85           char *name1 = realpath (".", NULL);
  86           char *name2 = realpath ("conftest.d//./..", NULL);
  87           if (strcmp (name1, name2) != 0)
  88             result |= 8;
  89         }
  90         return result;
  91       ]])
  92     ], [gl_cv_func_realpath_works=yes], [gl_cv_func_realpath_works=no],
  93        [gl_cv_func_realpath_works="guessing no"])
  94     rm -rf conftest.a conftest.d
  95   ])
  96   if test "$gl_cv_func_realpath_works" = yes; then
  97     AC_DEFINE([FUNC_REALPATH_WORKS], [1], [Define to 1 if realpath()
  98       can malloc memory, always gives an absolute path, and handles
  99       trailing slash correctly.])
 100   fi
 101 ])