166 lines
5.2 KiB
Text
166 lines
5.2 KiB
Text
# getcwd.m4 - check for working getcwd that is compatible with glibc
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# Copyright (C) 2001, 2003-2007, 2009-2021 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# Written by Paul Eggert.
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# serial 19
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AC_DEFUN([gl_FUNC_GETCWD_NULL],
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[
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CHECK_HEADERS_ONCE([unistd.h])
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AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
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[gl_cv_func_getcwd_null],
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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# include <stdlib.h>
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# if HAVE_UNISTD_H
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# include <unistd.h>
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# else /* on Windows with MSVC */
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# include <direct.h>
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# endif
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]GL_MDA_DEFINES[
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# ifndef getcwd
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char *getcwd ();
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# endif
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]], [[
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#if defined _WIN32 && ! defined __CYGWIN__
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/* mingw cwd does not start with '/', but _getcwd does allocate.
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However, mingw fails to honor non-zero size. */
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#else
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if (chdir ("/") != 0)
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return 1;
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else
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{
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char *f = getcwd (NULL, 0);
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if (! f)
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return 2;
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if (f[0] != '/')
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{ free (f); return 3; }
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if (f[1] != '\0')
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{ free (f); return 4; }
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free (f);
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return 0;
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}
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#endif
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]])],
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[gl_cv_func_getcwd_null=yes],
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[gl_cv_func_getcwd_null=no],
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[[case "$host_os" in
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# Guess yes on glibc systems.
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*-gnu* | gnu*) gl_cv_func_getcwd_null="guessing yes";;
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# Guess yes on musl systems.
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*-musl*) gl_cv_func_getcwd_null="guessing yes";;
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# Guess yes on Cygwin.
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cygwin*) gl_cv_func_getcwd_null="guessing yes";;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_getcwd_null="$gl_cross_guess_normal";;
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esac
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]])])
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])
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AC_DEFUN([gl_FUNC_GETCWD_SIGNATURE],
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[
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AC_CACHE_CHECK([for getcwd with POSIX signature],
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[gl_cv_func_getcwd_posix_signature],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <unistd.h>
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]GL_MDA_DEFINES],
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[[extern
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#ifdef __cplusplus
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"C"
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#endif
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char *getcwd (char *, size_t);
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]])
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],
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[gl_cv_func_getcwd_posix_signature=yes],
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[gl_cv_func_getcwd_posix_signature=no])
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])
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])
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dnl Guarantee that getcwd will malloc with a NULL first argument. Assumes
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dnl that either the system getcwd is robust, or that calling code is okay
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dnl with spurious failures when run from a directory with an absolute name
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dnl larger than 4k bytes.
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dnl
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dnl Assumes that getcwd exists; if you are worried about obsolete
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dnl platforms that lacked getcwd(), then you need to use the GPL module.
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AC_DEFUN([gl_FUNC_GETCWD_LGPL],
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[
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_GETCWD_NULL])
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AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
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case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_posix_signature in
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*yes,yes) ;;
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*)
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dnl Minimal replacement lib/getcwd-lgpl.c.
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REPLACE_GETCWD=1
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;;
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esac
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])
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dnl Check for all known getcwd bugs; useful for a program likely to be
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dnl executed from an arbitrary location.
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AC_DEFUN([gl_FUNC_GETCWD],
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[
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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AC_REQUIRE([gl_FUNC_GETCWD_NULL])
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AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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gl_abort_bug=no
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case "$host_os" in
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mingw*)
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gl_cv_func_getcwd_path_max=yes
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;;
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*)
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gl_FUNC_GETCWD_PATH_MAX
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case "$gl_cv_func_getcwd_null" in
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*yes)
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gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes])
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;;
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esac
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;;
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esac
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dnl Define HAVE_MINIMALLY_WORKING_GETCWD and HAVE_PARTLY_WORKING_GETCWD
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dnl if appropriate.
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case "$gl_cv_func_getcwd_path_max" in
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*"no" | *"no, it has the AIX bug") ;;
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*)
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AC_DEFINE([HAVE_MINIMALLY_WORKING_GETCWD], [1],
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[Define to 1 if getcwd minimally works, that is, its result can be
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trusted when it succeeds.])
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;;
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esac
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case "$gl_cv_func_getcwd_path_max" in
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*"no, but it is partly working")
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AC_DEFINE([HAVE_PARTLY_WORKING_GETCWD], [1],
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[Define to 1 if getcwd works, except it sometimes fails when it
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shouldn't, setting errno to ERANGE, ENAMETOOLONG, or ENOENT.])
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;;
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*"yes, but with shorter paths")
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AC_DEFINE([HAVE_GETCWD_SHORTER], [1],
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[Define to 1 if getcwd works, but with shorter paths
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than is generally tested with the replacement.])
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;;
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esac
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if { case "$gl_cv_func_getcwd_null" in *yes) false;; *) true;; esac; } \
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|| test $gl_cv_func_getcwd_posix_signature != yes \
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|| { case "$gl_cv_func_getcwd_path_max" in *yes*) false;; *) true;; esac; } \
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|| test $gl_abort_bug = yes; then
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REPLACE_GETCWD=1
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fi
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])
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# Prerequisites of lib/getcwd.c, when full replacement is in effect.
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AC_DEFUN([gl_PREREQ_GETCWD],
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[
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])
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:
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])
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