-# serial 16
+# serial 19
dnl Run a program to determine whether link(2) follows symlinks.
dnl Set LINK_FOLLOWS_SYMLINKS accordingly.
-# Copyright (C) 1999-2001, 2004-2006, 2009-2011 Free Software Foundation, Inc.
+# Copyright (C) 1999-2001, 2004-2006, 2009-2013 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.
dnl runtime test. If it is -2, use a generic runtime test.
AC_DEFUN([gl_FUNC_LINK_FOLLOWS_SYMLINK],
[dnl
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_FUNCS_ONCE([readlink])
dnl Mingw lacks link, although gnulib provides a good replacement.
dnl However, it also lacks symlink, so there's nothing to test in
]])],
[gl_cv_func_link_follows_symlink=no], dnl GNU behavior
[gl_cv_func_link_follows_symlink=yes], dnl Followed link/compile failed
- [gl_cv_func_link_follows_symlink=unknown] dnl We're cross compiling.
- )
+ [dnl We're cross compiling.
+ dnl The past results are "yes" on Mac OS X, FreeBSD, NetBSD,
+ dnl OpenBSD, Minix, AIX, HP-UX, OSF/1, and "no" on Linux, Cygwin.
+ case "$host_os" in
+ # On glibc/Linux we know the result.
+ linux*-gnu*) gl_cv_func_link_follows_symlink="guessing no" ;;
+ # Otherwise, we don't know.
+ *) gl_cv_func_link_follows_symlink=unknown ;;
+ esac
+ ])
rm -f conftest.file conftest.sym conftest.hard
])
- case $gl_cv_func_link_follows_symlink in
- yes) gl_link_follows_symlinks=1 ;;
- no) ;; # already defaulted to 0
+ case "$gl_cv_func_link_follows_symlink" in
+ *yes) gl_link_follows_symlinks=1 ;;
+ *no) ;; # already defaulted to 0
*) gl_link_follows_symlinks=-2 ;;
esac
fi
fi
AC_DEFINE_UNQUOTED([LINK_FOLLOWS_SYMLINKS], [$gl_link_follows_symlinks],
- [Define to 1 if `link(2)' dereferences symbolic links, 0 if it
+ [Define to 1 if 'link(2)' dereferences symbolic links, 0 if it
creates hard links to symlinks, -1 if it depends on the variable __xpg4,
and -2 if unknown.])
])