summaryrefslogtreecommitdiff
path: root/m4/canonicalize.m4
blob: 475fa15d6bdf5a95412b89c987bf02680bd0308f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
# canonicalize.m4 serial 35

dnl Copyright (C) 2003-2007, 2009-2021 Free Software Foundation, Inc.

dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

# Provides canonicalize_file_name and canonicalize_filename_mode, but does
# not provide or fix realpath.
AC_DEFUN([gl_FUNC_CANONICALIZE_FILENAME_MODE],
[
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
  AC_CHECK_FUNCS_ONCE([canonicalize_file_name faccessat])
  AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
  AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
  if test $ac_cv_func_canonicalize_file_name = no; then
    HAVE_CANONICALIZE_FILE_NAME=0
  else
    case "$gl_cv_func_realpath_works" in
      *yes) ;;
      *)    REPLACE_CANONICALIZE_FILE_NAME=1 ;;
    esac
  fi
])

# Provides canonicalize_file_name and realpath.
AC_DEFUN([gl_CANONICALIZE_LGPL],
[
  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
  AC_REQUIRE([gl_CANONICALIZE_LGPL_SEPARATE])
  if test $ac_cv_func_canonicalize_file_name = no; then
    HAVE_CANONICALIZE_FILE_NAME=0
    if test $ac_cv_func_realpath = no; then
      HAVE_REALPATH=0
    else
      case "$gl_cv_func_realpath_works" in
        *yes) ;;
        *)    REPLACE_REALPATH=1 ;;
      esac
    fi
  else
    case "$gl_cv_func_realpath_works" in
      *yes)
        ;;
      *)
        REPLACE_CANONICALIZE_FILE_NAME=1
        REPLACE_REALPATH=1
        ;;
    esac
  fi
])

# Like gl_CANONICALIZE_LGPL, except prepare for separate compilation
# (no REPLACE_CANONICALIZE_FILE_NAME, no REPLACE_REALPATH, no AC_LIBOBJ).
AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE],
[
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
  AC_CHECK_FUNCS_ONCE([canonicalize_file_name faccessat])

  dnl On native Windows, we use _getcwd(), regardless whether getcwd() is
  dnl available through the linker option '-loldnames'.
  AC_REQUIRE([AC_CANONICAL_HOST])
  case "$host_os" in
    mingw*) ;;
    *)      AC_CHECK_FUNCS([getcwd]) ;;
  esac

  AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
  AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
  AC_CHECK_HEADERS_ONCE([sys/param.h])
])

# Check whether realpath works.  Assume that if a platform has both
# realpath and canonicalize_file_name, but the former is broken, then
# so is the latter.
AC_DEFUN([gl_FUNC_REALPATH_WORKS],
[
  AC_CHECK_FUNCS_ONCE([realpath])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether realpath works], [gl_cv_func_realpath_works], [
    rm -rf conftest.a conftest.d
    touch conftest.a
    mkdir conftest.d
    AC_RUN_IFELSE([
      AC_LANG_PROGRAM([[
        ]GL_NOCRASH[
        #include <stdlib.h>
        #include <string.h>
      ]], [[
        int result = 0;
        {
          char *name = realpath ("conftest.a", NULL);
          if (!(name && *name == '/'))
            result |= 1;
          free (name);
        }
        {
          char *name = realpath ("conftest.b/../conftest.a", NULL);
          if (name != NULL)
            result |= 2;
          free (name);
        }
        {
          char *name = realpath ("conftest.a/", NULL);
          if (name != NULL)
            result |= 4;
          free (name);
        }
        {
          char *name1 = realpath (".", NULL);
          char *name2 = realpath ("conftest.d//./..", NULL);
          if (! name1 || ! name2 || strcmp (name1, name2))
            result |= 8;
          free (name1);
          free (name2);
        }
        return result;
      ]])
     ],
     [gl_cv_func_realpath_works=yes],
     [gl_cv_func_realpath_works=no],
     [case "$host_os" in
                       # Guess yes on glibc systems.
        *-gnu* | gnu*) gl_cv_func_realpath_works="guessing yes" ;;
                       # Guess yes on musl systems.
        *-musl*)       gl_cv_func_realpath_works="guessing yes" ;;
                       # Guess no on native Windows.
        mingw*)        gl_cv_func_realpath_works="guessing no" ;;
                       # If we don't know, obey --enable-cross-guesses.
        *)             gl_cv_func_realpath_works="$gl_cross_guess_normal" ;;
      esac
     ])
    rm -rf conftest.a conftest.d
  ])
  case "$gl_cv_func_realpath_works" in
    *yes)
      AC_DEFINE([FUNC_REALPATH_WORKS], [1], [Define to 1 if realpath()
        can malloc memory, always gives an absolute path, and handles
        trailing slash correctly.])
      ;;
  esac
])