Hi! The newly added rs6000-modes.h is now included from rs6000.h, so it is needed when building plugins that include tm.h, but it wasn't listed in the Makefile fragments and therefore included among PLUGIN_HEADERS.
Fixed thusly, tested on powerpc64le-linux, ok for trunk and 8.2? 2018-06-28 Jakub Jelinek <ja...@redhat.com> * config/rs6000/t-rs6000: Append rs6000-modes.h to TM_H. --- gcc/config/rs6000/t-rs6000.jj 2018-05-06 23:13:00.205627800 +0200 +++ gcc/config/rs6000/t-rs6000 2018-06-28 23:31:41.426185017 +0200 @@ -20,6 +20,7 @@ TM_H += $(srcdir)/config/rs6000/rs6000-builtin.def TM_H += $(srcdir)/config/rs6000/rs6000-cpus.def +TM_H += $(srcdir)/config/rs6000/rs6000-modes.h PASSES_EXTRA += $(srcdir)/config/rs6000/rs6000-passes.def rs6000-c.o: $(srcdir)/config/rs6000/rs6000-c.c Jakub