kernel/gcov/Makefile - linux - Git at Google

 EXTRA_CFLAGS := -DSRCTREE='"$(srctree)"' -DOBJTREE='"$(objtree)"'

 obj-$(CONFIG_GCOV_KERNEL) := base.o fs.o gcc_3_4.o
	EXTRA_CFLAGS := -DSRCTREE='"$(srctree)"' -DOBJTREE='"$(objtree)"'

	obj-$(CONFIG_GCOV_KERNEL) := base.o fs.o gcc_3_4.o