Mercurial > gnulib
view m4/getcwd.m4 @ 39194:a84ae461a2f6
Add cross-compilation results for GNU/Hurd.
* m4/calloc.m4: Add GNU/Hurd guess.
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author | Samuel Thibault <samuel.thibault@gnu.org> |
---|---|
date | Fri, 29 Dec 2017 17:30:07 +0100 |
parents | b2058049fa38 |
children | 10eb9086bea0 |
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# getcwd.m4 - check for working getcwd that is compatible with glibc # Copyright (C) 2001, 2003-2007, 2009-2017 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 15 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] != '/') { free (f); return 3; } if (f[1] != '\0') { free (f); 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* | 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]) : ])