https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61797
--- Comment #1 from Mikael Pettersson <mikpelinux at gmail dot com> --- decl_in_symtab_p is used under #ifdef ENABLE_CHECKING by symtab_get_node (also in craph.h), and unconditionally by fold-const.c:tree_single_nonzero_warnv_p. Sticking an __attribute__((__used__)) on decl_in_symtab_p allows bootstrap to continue, until it hits build/genmodes: config/i386/i386-modes.def:25: (TF) field format must not be set build/genmodes: config/i386/i386-modes.def:24: (XF) field format must not be set build/genmodes: machmode.def:203: (DF) field format must not be set build/genmodes: machmode.def:202: (SF) field format must not be set build/genmodes: machmode.def:244: (TD) field format must not be set build/genmodes: machmode.def:243: (DD) field format must not be set build/genmodes: machmode.def:242: (SD) field format must not be set make[3]: *** [s-modes-m] Error 1 in stage 3, i.e. PR61757.
