gnulib/import/m4/stat.m4

   1 # serial 16
   2
   3 # Copyright (C) 2009-2019 Free Software Foundation, Inc.
   4 #
   5 # This file is free software; the Free Software Foundation
   6 # gives unlimited permission to copy and/or distribute it,
   7 # with or without modifications, as long as this notice is preserved.
   8
   9 AC_DEFUN([gl_FUNC_STAT],
  10 [
  11   AC_REQUIRE([AC_CANONICAL_HOST])
  12   AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
  13   AC_CHECK_FUNCS_ONCE([lstat])
  14   case "$host_os" in
  15     mingw*)
  16       dnl On this platform, the original stat() returns st_atime, st_mtime,
  17       dnl st_ctime values that are affected by the time zone.
  18       REPLACE_STAT=1
  19       ;;
  20     *)
  21       dnl AIX 7.1, Solaris 9, mingw64 mistakenly succeed on stat("file/").
  22       dnl (For mingw, this is due to a broken stat() override in libmingwex.a.)
  23       dnl FreeBSD 7.2 mistakenly succeeds on stat("link-to-file/").
  24       AC_CACHE_CHECK([whether stat handles trailing slashes on files],
  25         [gl_cv_func_stat_file_slash],
  26         [touch conftest.tmp
  27          # Assume that if we have lstat, we can also check symlinks.
  28          if test $ac_cv_func_lstat = yes; then
  29            ln -s conftest.tmp conftest.lnk
  30          fi
  31          AC_RUN_IFELSE(
  32            [AC_LANG_PROGRAM(
  33              [[#include <sys/stat.h>
  34 ]], [[int result = 0;
  35                struct stat st;
  36                if (!stat ("conftest.tmp/", &st))
  37                  result |= 1;
  38 #if HAVE_LSTAT
  39                if (!stat ("conftest.lnk/", &st))
  40                  result |= 2;
  41 #endif
  42                return result;
  43              ]])],
  44            [gl_cv_func_stat_file_slash=yes], [gl_cv_func_stat_file_slash=no],
  45            [case "$host_os" in
  46                                # Guess yes on Linux systems.
  47               linux-* | linux) gl_cv_func_stat_file_slash="guessing yes" ;;
  48                                # Guess yes on glibc systems.
  49               *-gnu* | gnu*)   gl_cv_func_stat_file_slash="guessing yes" ;;
  50                                # If we don't know, obey --enable-cross-guesses.
  51               *)               gl_cv_func_stat_file_slash="$gl_cross_guess_normal" ;;
  52             esac
  53            ])
  54          rm -f conftest.tmp conftest.lnk])
  55       case $gl_cv_func_stat_file_slash in
  56         *no)
  57           REPLACE_STAT=1
  58           AC_DEFINE([REPLACE_FUNC_STAT_FILE], [1], [Define to 1 if stat needs
  59             help when passed a file name with a trailing slash]);;
  60       esac
  61       case $host_os in
  62         dnl Solaris stat can return a negative tv_nsec.
  63         solaris*)
  64           REPLACE_FSTAT=1 ;;
  65       esac
  66       ;;
  67   esac
  68 ])
  69
  70 # Prerequisites of lib/stat.c and lib/stat-w32.c.
  71 AC_DEFUN([gl_PREREQ_STAT], [
  72   AC_REQUIRE([gl_HEADER_SYS_STAT_H])
  73   :
  74 ])