File: stat.m4

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# serial 4

# Copyright (C) 2009, 2010 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.

AC_DEFUN([gl_FUNC_STAT],
[
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_REQUIRE([gl_AC_DOS])
  AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
  AC_CHECK_FUNCS_ONCE([lstat])
  dnl mingw is the only known platform where stat(".") and stat("./") differ
  AC_CACHE_CHECK([whether stat handles trailing slashes on directories],
      [gl_cv_func_stat_dir_slash],
      [AC_RUN_IFELSE(
         [AC_LANG_PROGRAM(
           [[#include <sys/stat.h>
]], [[struct stat st; return stat (".", &st) != stat ("./", &st);]])],
         [gl_cv_func_stat_dir_slash=yes], [gl_cv_func_stat_dir_slash=no],
         [case $host_os in
            mingw*) gl_cv_func_stat_dir_slash="guessing no";;
            *) gl_cv_func_stat_dir_slash="guessing yes";;
          esac])])
  dnl Solaris 9 mistakenly succeeds on stat("file/")
  dnl FreeBSD 7.2 mistakenly succeeds on stat("link-to-file/")
  AC_CACHE_CHECK([whether stat handles trailing slashes on files],
      [gl_cv_func_stat_file_slash],
      [touch conftest.tmp
       # Assume that if we have lstat, we can also check symlinks.
       if test $ac_cv_func_lstat = yes; then
         ln -s conftest.tmp conftest.lnk
       fi
       AC_RUN_IFELSE(
         [AC_LANG_PROGRAM(
           [[#include <sys/stat.h>
]], [[struct stat st;
      if (!stat ("conftest.tmp/", &st)) return 1;
#if HAVE_LSTAT
      if (!stat ("conftest.lnk/", &st)) return 2;
#endif
           ]])],
         [gl_cv_func_stat_file_slash=yes], [gl_cv_func_stat_file_slash=no],
         [gl_cv_func_stat_file_slash="guessing no"])
       rm -f conftest.tmp conftest.lnk])
  case $gl_cv_func_stat_dir_slash in
    *no) REPLACE_STAT=1
      AC_DEFINE([REPLACE_FUNC_STAT_DIR], [1], [Define to 1 if stat needs
        help when passed a directory name with a trailing slash]);;
  esac
  case $gl_cv_func_stat_file_slash in
    *no) REPLACE_STAT=1
      AC_DEFINE([REPLACE_FUNC_STAT_FILE], [1], [Define to 1 if stat needs
        help when passed a file name with a trailing slash]);;
  esac
  if test $REPLACE_STAT = 1; then
    AC_LIBOBJ([stat])
    dnl Prerequisites of lib/stat.c.
    AC_REQUIRE([AC_C_INLINE])
  fi
])