X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fgetcwd.m4;h=d3bbe597b365eba88bf1e9dd73694499e4b17e69;hb=395f9e6a19b504609aa8b0bd7f8cc55d4547d8dd;hp=fab8bfcf939ce442f201c84b6649115b1f0cd6b3;hpb=f3b23269e922ab27aaa589ec79f24593338c421c;p=gnulib.git diff --git a/m4/getcwd.m4 b/m4/getcwd.m4 index fab8bfcf9..d3bbe597b 100644 --- a/m4/getcwd.m4 +++ b/m4/getcwd.m4 @@ -1,77 +1,128 @@ # getcwd.m4 - check for working getcwd that is compatible with glibc -# Copyright (C) 2001, 2003, 2004 Free Software Foundation, Inc. - -# This program is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 2, or (at your option) -# any later version. - -# This program is distributed in the hope that it will be useful, -# but WITHOUT ANY WARRANTY; without even the implied warranty of -# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -# GNU General Public License for more details. - -# You should have received a copy of the GNU General Public License -# along with this program; if not, write to the Free Software Foundation, -# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +# Copyright (C) 2001, 2003-2007, 2009-2011 Free Software Foundation, Inc. +# This file is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. # Written by Paul Eggert. +# serial 8 AC_DEFUN([gl_FUNC_GETCWD_NULL], [ - AC_CHECK_HEADERS_ONCE(unistd.h) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result], [gl_cv_func_getcwd_null], - [AC_TRY_RUN( - [ -# include -# ifdef HAVE_UNISTD_H -# include -# endif -# ifndef getcwd - char *getcwd (); -# endif - int - main () - { - if (chdir ("/") != 0) - exit (1); - else - { - char *f = getcwd (NULL, 0); - exit (! (f && f[0] == '/' && !f[1])); - } - }], - [gl_cv_func_getcwd_null=yes], - [gl_cv_func_getcwd_null=no], - [gl_cv_func_getcwd_null=no])]) + [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ +# include +# ifndef getcwd + char *getcwd (); +# endif +]], [[ +#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ +/* mingw cwd does not start with '/', but getcwd does allocate. + However, mingw fails to honor non-zero size. */ +#else + if (chdir ("/") != 0) + return 1; + else + { + char *f = getcwd (NULL, 0); + if (! f) + return 2; + if (f[0] != '/') + return 3; + if (f[1] != '\0') + return 4; + return 0; + } +#endif + ]])], + [gl_cv_func_getcwd_null=yes], + [gl_cv_func_getcwd_null=no], + [[ + case "$host_os" in + # Guess yes on glibc systems. + *-gnu*) gl_cv_func_getcwd_null="guessing yes";; + # Guess yes on Cygwin. + cygwin*) gl_cv_func_getcwd_null="guessing yes";; + # If we don't know, assume the worst. + *) gl_cv_func_getcwd_null="guessing no";; + esac + ]])]) +]) + +AC_DEFUN([gl_FUNC_GETCWD_SIGNATURE], +[ + AC_CACHE_CHECK([for getcwd with POSIX signature], + [gl_cv_func_getcwd_posix_signature], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include ]], + [[extern + #ifdef __cplusplus + "C" + #endif + char *getcwd (char *, size_t); + ]]) + ], + [gl_cv_func_getcwd_posix_signature=yes], + [gl_cv_func_getcwd_posix_signature=no]) + ]) +]) + +dnl Guarantee that getcwd will malloc with a NULL first argument. Assumes +dnl that either the system getcwd is robust, or that calling code is okay +dnl with spurious failures when run from a directory with an absolute name +dnl larger than 4k bytes. +dnl +dnl Assumes that getcwd exists; if you are worried about obsolete +dnl platforms that lacked getcwd(), then you need to use the GPL module. +AC_DEFUN([gl_FUNC_GETCWD_LGPL], +[ + AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) + AC_REQUIRE([gl_FUNC_GETCWD_NULL]) + AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE]) + + case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_posix_signature in + *yes,yes) ;; + *) + dnl Minimal replacement lib/getcwd-lgpl.c. + REPLACE_GETCWD=1 + ;; + esac ]) +dnl Check for all known getcwd bugs; useful for a program likely to be +dnl executed from an arbitrary location. AC_DEFUN([gl_FUNC_GETCWD], [ + AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) AC_REQUIRE([gl_FUNC_GETCWD_NULL]) + AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles - case $gl_cv_func_getcwd_null in - yes) gl_FUNC_GETCWD_PATH_MAX;; + gl_abort_bug=no + case $gl_cv_func_getcwd_null,$host_os in + *,mingw*) + gl_cv_func_getcwd_path_max=yes;; + yes,*) + gl_FUNC_GETCWD_PATH_MAX + gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes]);; esac - case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_path_max in - yes,yes) ;; + case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_posix_signature$gl_cv_func_getcwd_path_max,$gl_abort_bug in + *yes,yes,yes,no) ;; *) - AC_LIBOBJ([getcwd]) - AC_DEFINE([__GETCWD_PREFIX], [[rpl_]], - [Define to rpl_ if the getcwd replacement function should be used.]) - gl_PREREQ_GETCWD;; + dnl Full replacement lib/getcwd.c, overrides LGPL replacement. + REPLACE_GETCWD=1;; esac ]) -# Prerequisites of lib/getcwd.c. +# Prerequisites of lib/getcwd.c, when full replacement is in effect. AC_DEFUN([gl_PREREQ_GETCWD], [ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) - AC_REQUIRE([AC_HEADER_DIRENT]) AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO]) - AC_CHECK_HEADERS_ONCE(fcntl.h) : ])