arch_head must be defined in arch/$(ARCH)/Makefile.defs.noconfig. The
value of arch_head is used by pp_makefile2 to generate the global
makefile, Makefile.defs.config is not read until after the global
makefile is created, in fact Makefile.defs.config is only read by the
global makefile.
There is a bug in pp_makefile2.c, trim_arch_head() assumes that
arch_head is always set to at least one string. If you really need an
empty arch_head, change trim_arch_head() from
for (a = arch_head; *a; ++a) {
to
for (a = arch_head; a && *a; ++a) {
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