What CONFIG_ option enables compilation of *.o file?

[Denis Efremov <efremov@linux.com>]

Hi,

Is there a general way to get information about what CONFIG_ options
enable compilation of *.o (*.[ch]) file? Maybe with kconfig command or from
some generated files?

I mean, to get information that, for example:
1) driver/block/floppy.o depends on CONFIG_BLK_DEV_FD

From driver/block/Makefile:
	obj-$(CONFIG_BLK_DEV_FD)        += floppy.o

2) kernel/trace/trace_selftest_dynamic.o depends on CONFIG_FTRACE_SELFTEST

From kernel/trace/Makefile:
	ifdef CONFIG_FTRACE_SELFTEST
	obj-y += trace_selftest_dynamic.o
	endif

3) kernel/trace/trace_irqsoff.o depends on either CONFIG_IRQSOFF_TRACER
   or CONFIG_PREEMPT_TRACER

From kernel/trace/Makefile:
	obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
	obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o

4) drivers/dax/bus.o depends on CONFIG_DAX

From drivers/dax/Makefile:
	obj-$(CONFIG_DAX) += dax.o 
	dax-y += bus.o

5) drivers/soc/bcm/brcmstb/common.o depends on CONFIG_SOC_BRCMSTB

From drivers/Makefile:
	obj-y                           += soc/ 
From drivers/soc/Makefile:
	obj-y                           += bcm/
From drivers/soc/bcm/Makefile:
	obj-$(CONFIG_SOC_BRCMSTB)       += brcmstb/
From drivers/soc/bcm/brcmstb/Makefile
	obj-y += common.o 

Thanks,
Denis