diff options
Diffstat (limited to 'm4/xattr.m4')
| -rw-r--r-- | m4/xattr.m4 | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/m4/xattr.m4 b/m4/xattr.m4 new file mode 100644 index 00000000000..7f72a81eeab --- /dev/null +++ b/m4/xattr.m4 @@ -0,0 +1,53 @@ +# xattr.m4 - check for Extended Attributes (Linux) +# serial 7 + +# Copyright (C) 2003-2024 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_XATTR], +[ + AC_ARG_ENABLE([xattr], + AS_HELP_STRING([[--disable-xattr]], + [do not support extended attributes]), + [use_xattr=$enableval], [use_xattr=yes]) + + LIB_XATTR= + AC_SUBST([LIB_XATTR]) + + if test "$use_xattr" = yes; then + AC_CACHE_CHECK([for xattr library with ATTR_ACTION_PERMISSIONS], + [gl_cv_xattr_lib], + [gl_cv_xattr_lib=no + AC_LANG_CONFTEST( + [AC_LANG_PROGRAM( + [[#include <attr/error_context.h> + #include <attr/libattr.h> + static int + is_attr_permissions (const char *name, struct error_context *ctx) + { + return attr_copy_action (name, ctx) == ATTR_ACTION_PERMISSIONS; + } + ]], + [[return attr_copy_fd ("/", 0, "/", 0, is_attr_permissions, 0); + ]])]) + AC_LINK_IFELSE([], + [gl_cv_xattr_lib='none required'], + [xattr_saved_LIBS=$LIBS + LIBS="-lattr $LIBS" + AC_LINK_IFELSE([], [gl_cv_xattr_lib=-lattr]) + LIBS=$xattr_saved_LIBS])]) + if test "$gl_cv_xattr_lib" = no; then + AC_MSG_WARN([libattr development library was not found or not usable.]) + AC_MSG_WARN([AC_PACKAGE_NAME will be built without xattr support.]) + use_xattr=no + elif test "$gl_cv_xattr_lib" != 'none required'; then + LIB_XATTR=$gl_cv_xattr_lib + fi + fi + if test "$use_xattr" = yes; then + AC_DEFINE([USE_XATTR], [1], + [Define to 1 to use the Linux extended attributes library.]) + fi +]) |