1# canonicalize.m4 serial 30
2
3dnl Copyright (C) 2003-2007, 2009-2019 Free Software Foundation, Inc.
4
5dnl This file is free software; the Free Software Foundation
6dnl gives unlimited permission to copy and/or distribute it,
7dnl 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.
11AC_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.
28AC_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).
56AC_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.
68AC_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                       # Guess yes on musl systems.
117        *-musl*)       gl_cv_func_realpath_works="guessing yes" ;;
118                       # Guess no on native Windows.
119        mingw*)        gl_cv_func_realpath_works="guessing no" ;;
120                       # If we don't know, assume the worst.
121        *)             gl_cv_func_realpath_works="guessing no" ;;
122      esac
123     ])
124    rm -rf conftest.a conftest.d
125  ])
126  case "$gl_cv_func_realpath_works" in
127    *yes)
128      AC_DEFINE([FUNC_REALPATH_WORKS], [1], [Define to 1 if realpath()
129        can malloc memory, always gives an absolute path, and handles
130        trailing slash correctly.])
131      ;;
132  esac
133])
134