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55 lines
1.8 KiB
Plaintext
55 lines
1.8 KiB
Plaintext
# xattr.m4
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# serial 7
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dnl Copyright (C) 2003-2024 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# Check for Extended Attributes (Linux)
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AC_DEFUN([gl_FUNC_XATTR],
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[
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AC_ARG_ENABLE([xattr],
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AS_HELP_STRING([[--disable-xattr]],
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[do not support extended attributes]),
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[use_xattr=$enableval], [use_xattr=yes])
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LIB_XATTR=
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AC_SUBST([LIB_XATTR])
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if test "$use_xattr" = yes; then
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AC_CACHE_CHECK([for xattr library with ATTR_ACTION_PERMISSIONS],
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[gl_cv_xattr_lib],
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[gl_cv_xattr_lib=no
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AC_LANG_CONFTEST(
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[AC_LANG_PROGRAM(
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[[#include <attr/error_context.h>
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#include <attr/libattr.h>
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static int
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is_attr_permissions (const char *name, struct error_context *ctx)
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{
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return attr_copy_action (name, ctx) == ATTR_ACTION_PERMISSIONS;
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}
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]],
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[[return attr_copy_fd ("/", 0, "/", 0, is_attr_permissions, 0);
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]])])
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AC_LINK_IFELSE([],
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[gl_cv_xattr_lib='none required'],
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[xattr_saved_LIBS=$LIBS
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LIBS="-lattr $LIBS"
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AC_LINK_IFELSE([], [gl_cv_xattr_lib=-lattr])
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LIBS=$xattr_saved_LIBS])])
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if test "$gl_cv_xattr_lib" = no; then
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AC_MSG_WARN([libattr development library was not found or not usable.])
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AC_MSG_WARN([AC_PACKAGE_NAME will be built without xattr support.])
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use_xattr=no
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elif test "$gl_cv_xattr_lib" != 'none required'; then
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LIB_XATTR=$gl_cv_xattr_lib
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fi
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fi
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if test "$use_xattr" = yes; then
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AC_DEFINE([USE_XATTR], [1],
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[Define to 1 to use the Linux extended attributes library.])
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fi
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])
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