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