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Member "gnuastro-0.8/bootstrapped/m4/getcwd.m4" (28 Dec 2018, 5085 Bytes) of package /linux/privat/gnuastro-0.8.tar.lz:


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    1 # getcwd.m4 - check for working getcwd that is compatible with glibc
    2 
    3 # Copyright (C) 2001, 2003-2007, 2009-2018 Free Software Foundation, Inc.
    4 # This file is free software; the Free Software Foundation
    5 # gives unlimited permission to copy and/or distribute it,
    6 # with or without modifications, as long as this notice is preserved.
    7 
    8 # Written by Paul Eggert.
    9 # serial 16
   10 
   11 AC_DEFUN([gl_FUNC_GETCWD_NULL],
   12   [
   13    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   14    AC_CHECK_HEADERS_ONCE([unistd.h])
   15    AC_CACHE_CHECK([whether getcwd (NULL, 0) allocates memory for result],
   16      [gl_cv_func_getcwd_null],
   17      [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
   18 #	 include <stdlib.h>
   19 #        if HAVE_UNISTD_H
   20 #         include <unistd.h>
   21 #        else /* on Windows with MSVC */
   22 #         include <direct.h>
   23 #        endif
   24 #        ifndef getcwd
   25          char *getcwd ();
   26 #        endif
   27 ]], [[
   28 #if defined _WIN32 && ! defined __CYGWIN__
   29 /* mingw cwd does not start with '/', but getcwd does allocate.
   30    However, mingw fails to honor non-zero size.  */
   31 #else
   32            if (chdir ("/") != 0)
   33              return 1;
   34            else
   35              {
   36                char *f = getcwd (NULL, 0);
   37                if (! f)
   38                  return 2;
   39                if (f[0] != '/')
   40                  { free (f); return 3; }
   41                if (f[1] != '\0')
   42                  { free (f); return 4; }
   43                free (f);
   44                return 0;
   45              }
   46 #endif
   47          ]])],
   48         [gl_cv_func_getcwd_null=yes],
   49         [gl_cv_func_getcwd_null=no],
   50         [[case "$host_os" in
   51                            # Guess yes on glibc systems.
   52             *-gnu* | gnu*) gl_cv_func_getcwd_null="guessing yes";;
   53                            # Guess yes on Cygwin.
   54             cygwin*)       gl_cv_func_getcwd_null="guessing yes";;
   55                            # If we don't know, assume the worst.
   56             *)             gl_cv_func_getcwd_null="guessing no";;
   57           esac
   58         ]])])
   59 ])
   60 
   61 AC_DEFUN([gl_FUNC_GETCWD_SIGNATURE],
   62 [
   63   AC_CACHE_CHECK([for getcwd with POSIX signature],
   64     [gl_cv_func_getcwd_posix_signature],
   65     [AC_COMPILE_IFELSE(
   66       [AC_LANG_PROGRAM(
   67          [[#include <unistd.h>]],
   68          [[extern
   69            #ifdef __cplusplus
   70            "C"
   71            #endif
   72            char *getcwd (char *, size_t);
   73          ]])
   74       ],
   75       [gl_cv_func_getcwd_posix_signature=yes],
   76       [gl_cv_func_getcwd_posix_signature=no])
   77    ])
   78 ])
   79 
   80 dnl Guarantee that getcwd will malloc with a NULL first argument.  Assumes
   81 dnl that either the system getcwd is robust, or that calling code is okay
   82 dnl with spurious failures when run from a directory with an absolute name
   83 dnl larger than 4k bytes.
   84 dnl
   85 dnl Assumes that getcwd exists; if you are worried about obsolete
   86 dnl platforms that lacked getcwd(), then you need to use the GPL module.
   87 AC_DEFUN([gl_FUNC_GETCWD_LGPL],
   88 [
   89   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
   90   AC_REQUIRE([gl_FUNC_GETCWD_NULL])
   91   AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
   92 
   93   case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_posix_signature in
   94   *yes,yes) ;;
   95   *)
   96     dnl Minimal replacement lib/getcwd-lgpl.c.
   97     REPLACE_GETCWD=1
   98     ;;
   99   esac
  100 ])
  101 
  102 dnl Check for all known getcwd bugs; useful for a program likely to be
  103 dnl executed from an arbitrary location.
  104 AC_DEFUN([gl_FUNC_GETCWD],
  105 [
  106   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
  107   AC_REQUIRE([gl_FUNC_GETCWD_NULL])
  108   AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
  109   AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  110 
  111   gl_abort_bug=no
  112   case "$host_os" in
  113     mingw*)
  114       gl_cv_func_getcwd_path_max=yes
  115       ;;
  116     *)
  117       gl_FUNC_GETCWD_PATH_MAX
  118       case "$gl_cv_func_getcwd_null" in
  119         *yes)
  120           gl_FUNC_GETCWD_ABORT_BUG([gl_abort_bug=yes])
  121           ;;
  122       esac
  123       ;;
  124   esac
  125   dnl Define HAVE_MINIMALLY_WORKING_GETCWD and HAVE_PARTLY_WORKING_GETCWD
  126   dnl if appropriate.
  127   case "$gl_cv_func_getcwd_path_max" in
  128     "no"|"no, it has the AIX bug") ;;
  129     *)
  130       AC_DEFINE([HAVE_MINIMALLY_WORKING_GETCWD], [1],
  131         [Define to 1 if getcwd minimally works, that is, its result can be
  132          trusted when it succeeds.])
  133       ;;
  134   esac
  135   case "$gl_cv_func_getcwd_path_max" in
  136     "no, but it is partly working")
  137       AC_DEFINE([HAVE_PARTLY_WORKING_GETCWD], [1],
  138         [Define to 1 if getcwd works, except it sometimes fails when it
  139          shouldn't, setting errno to ERANGE, ENAMETOOLONG, or ENOENT.])
  140       ;;
  141     "yes, but with shorter paths")
  142       AC_DEFINE([HAVE_GETCWD_SHORTER], [1],
  143         [Define to 1 if getcwd works, but with shorter paths
  144          than is generally tested with the replacement.])
  145       ;;
  146   esac
  147 
  148   if { case "$gl_cv_func_getcwd_null" in *yes) false;; *) true;; esac; } \
  149      || test $gl_cv_func_getcwd_posix_signature != yes \
  150      || { case "$gl_cv_func_getcwd_path_max" in *yes*) false;; *) true;; esac; } \
  151      || test $gl_abort_bug = yes; then
  152     REPLACE_GETCWD=1
  153   fi
  154 ])
  155 
  156 # Prerequisites of lib/getcwd.c, when full replacement is in effect.
  157 AC_DEFUN([gl_PREREQ_GETCWD],
  158 [
  159   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  160   AC_REQUIRE([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO])
  161   :
  162 ])