| # getcwd.m4 - check for working getcwd that is compatible with glibc |
| |
| # Copyright (C) 2001, 2003-2007, 2009-2016 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 13 |
| |
| AC_DEFUN([gl_FUNC_GETCWD_NULL], |
| [ |
| 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], |
| [gl_cv_func_getcwd_null], |
| [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ |
| # include <stdlib.h> |
| # if HAVE_UNISTD_H |
| # include <unistd.h> |
| # else /* on Windows with MSVC */ |
| # include <direct.h> |
| # 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; |
| free (f); |
| 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 <unistd.h>]], |
| [[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.]) |
| ;; |
| "yes, but with shorter paths") |
| AC_DEFINE([HAVE_GETCWD_SHORTER], [1], |
| [Define to 1 if getcwd works, but with shorter paths |
| than is generally tested with the replacement.]) |
| ;; |
| esac |
| |
| if { case "$gl_cv_func_getcwd_null" in *yes) false;; *) true;; esac; } \ |
| || test $gl_cv_func_getcwd_posix_signature != yes \ |
| || { case "$gl_cv_func_getcwd_path_max" in *yes*) false;; *) true;; esac; } \ |
| || 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]) |
| : |
| ]) |