X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fgetcwd.m4;h=fc986cdab5feb095e122577742e710867e47329d;hb=1276a2c5f24c0c932426aca9c899fa524d2443f2;hp=159aa2bafe2b32b31ea134ace394e4ccd6374e1d;hpb=d01e199f674be88351d5956a13fe6dc406efacb5;p=gnulib.git diff --git a/m4/getcwd.m4 b/m4/getcwd.m4 index 159aa2baf..fc986cdab 100644 --- a/m4/getcwd.m4 +++ b/m4/getcwd.m4 @@ -1,52 +1,155 @@ -# getcwd.m4 - check whether getcwd (NULL, 0) allocates memory for result +# getcwd.m4 - check for working getcwd that is compatible with glibc -# Copyright (C) 2001, 2003 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, 2009-2014 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 12 -AC_DEFUN([AC_FUNC_GETCWD_NULL], +AC_DEFUN([gl_FUNC_GETCWD_NULL], [ - AC_CHECK_HEADERS_ONCE(unistd.h) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + AC_CHECK_HEADERS_ONCE([unistd.h]) AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result], - [ac_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])); - } - }], - [ac_cv_func_getcwd_null=yes], - [ac_cv_func_getcwd_null=no], - [ac_cv_func_getcwd_null=no])]) - if test $ac_cv_func_getcwd_null = yes; then - AC_DEFINE(HAVE_GETCWD_NULL, 1, - [Define if getcwd (NULL, 0) allocates memory for result.]) - fi]) + [gl_cv_func_getcwd_null], + [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ +# if HAVE_UNISTD_H +# include +# else /* on Windows with MSVC */ +# include +# endif +# ifndef getcwd + char *getcwd (); +# endif +]], [[ +#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ +/* mingw cwd does not start with '/', but getcwd does allocate. + However, mingw fails to honor non-zero size. */ +#else + if (chdir ("/") != 0) + return 1; + else + { + char *f = getcwd (NULL, 0); + if (! f) + return 2; + if (f[0] != '/') + return 3; + if (f[1] != '\0') + return 4; + return 0; + } +#endif + ]])], + [gl_cv_func_getcwd_null=yes], + [gl_cv_func_getcwd_null=no], + [[case "$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 + + gl_abort_bug=no + case "$host_os" in + mingw*) + gl_cv_func_getcwd_path_max=yes + ;; + *) + gl_FUNC_GETCWD_PATH_MAX + case "$gl_cv_func_getcwd_null" in + *yes) + gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes]) + ;; + esac + ;; + esac + dnl Define HAVE_MINIMALLY_WORKING_GETCWD and HAVE_PARTLY_WORKING_GETCWD + dnl if appropriate. + case "$gl_cv_func_getcwd_path_max" in + "no"|"no, it has the AIX bug") ;; + *) + AC_DEFINE([HAVE_MINIMALLY_WORKING_GETCWD], [1], + [Define to 1 if getcwd minimally works, that is, its result can be + trusted when it succeeds.]) + ;; + esac + case "$gl_cv_func_getcwd_path_max" in + "no, but it is partly working") + AC_DEFINE([HAVE_PARTLY_WORKING_GETCWD], [1], + [Define to 1 if getcwd works, except it sometimes fails when it + shouldn't, setting errno to ERANGE, ENAMETOOLONG, or ENOENT.]) + ;; + esac + + if { case "$gl_cv_func_getcwd_null" in *yes) false;; *) true;; esac; } \ + || test $gl_cv_func_getcwd_posix_signature != yes \ + || test "$gl_cv_func_getcwd_path_max" != yes \ + || test $gl_abort_bug = yes; then + REPLACE_GETCWD=1 + fi +]) + +# Prerequisites of lib/getcwd.c, when full replacement is in effect. +AC_DEFUN([gl_PREREQ_GETCWD], +[ + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO]) + : +])