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# d-ino.m4
# serial 22
dnl Copyright (C) 1997, 1999-2001, 2003-2004, 2006-2007, 2009-2024 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Jim Meyering.
dnl
dnl Check whether struct dirent has a member named d_ino.
AC_DEFUN([gl_CHECK_TYPE_STRUCT_DIRENT_D_INO],
[AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([for d_ino member in directory struct],
[gl_cv_struct_dirent_d_ino],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
]],
[[DIR *dp = opendir (".");
struct dirent *e;
struct stat st;
if (! dp)
return 1;
e = readdir (dp);
if (! e)
{ closedir (dp); return 2; }
if (lstat (e->d_name, &st) != 0)
{ closedir (dp); return 3; }
if (e->d_ino != st.st_ino)
{ closedir (dp); return 4; }
closedir (dp);
return 0;
]])],
[gl_cv_struct_dirent_d_ino=yes],
[gl_cv_struct_dirent_d_ino=no],
[case "$host_os" in
# Guess yes on glibc systems with Linux kernel.
linux*-gnu*) gl_cv_struct_dirent_d_ino="guessing yes" ;;
# Guess yes on musl systems with Linux kernel.
linux*-musl*) gl_cv_struct_dirent_d_ino="guessing yes" ;;
# Guess yes on systems that emulate the Linux system calls.
midipix*) gl_cv_struct_dirent_d_ino="guessing yes" ;;
# Guess no on native Windows.
mingw* | windows*) gl_cv_struct_dirent_d_ino="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_struct_dirent_d_ino="$gl_cross_guess_normal" ;;
esac
])])
case "$gl_cv_struct_dirent_d_ino" in
*yes)
AC_DEFINE([D_INO_IN_DIRENT], [1],
[Define if struct dirent has a member d_ino that actually works.])
;;
esac
]
)
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