* automake.in (lang_c_rewrite): Do not require AM_PROG_CC_C_O for libtool objects. (handle_single_transform): Pass nonansi_obj to &$subr so lang_c_rewrite can distinguish libtool objects. * tests/libtool7.test: Use subdir-objects without using AM_PROG_CC_C_O. Report from Gary V. Vaughan and Patrick Welche.