gcc crashes when trying to use pch under hardened kernels

http://bugs.gentoo.org/425524

--- Makefile.in
+++ Makefile.in
@@ -300,7 +300,7 @@
 	src        \
 	tests
 
-SANDBOX_PCH = headers.h.gch libsandbox/headers.h.gch libsbutil/headers.h.gch
+SANDBOX_PCH =
 BUILT_SOURCES = $(SANDBOX_PCH)
 noinst_LTLIBRARIES = libpch.la
 nodist_libpch_la_SOURCES = $(SANDBOX_PCH)
@@ -862,10 +862,9 @@
 $(builddir)/headers.h.gch: headers.h
 	$(AM_V_GEN)$(COMPILE) -c -o $@.o $< && $(GCH_CP)
 
-libsbutil: libsbutil/headers.h.gch
-libsandbox: libsbutil libsandbox/headers.h.gch
-src: libsbutil headers.h.gch
-tests: src headers.h.gch
+libsandbox: libsbutil
+src: libsbutil
+tests: src
 
 ChangeLog:
 	touch ChangeLog