Hi
I have problem with passing flag from makefile to .c file.
During building external kernel module my macro isn't seen by compiler. I used plenty of ways.
First way:
ccflags-y += -DMY_FLAG
$(MAKE) -C $(KERNEL_SRC) M=$(SRC)
Second:
$(MAKE) -C $(KERNEL_SRC) M=$(SRC) CFLAGS_my-kernel-module.o="-DMY_FLAG"
Third:
$(MAKE) -C $(KERNEL_SRC) M=$(SRC) CFLAGS="-DMY_FLAG"
Forth:
$(MAKE) -C $(KERNEL_SRC) M=$(SRC) ccflags-y="-DMY_FLAG"
In general I use bitbake to build external kernel modules. And I wonder if bitbake doesn't introduce issue as some of above solution really should work. And additionally I had to use absolute paths in headers because relative didn't work so -I append also doesn't work:
SRC := $(shell pwd)
ccflags-y := -I$(SRC)
BR
Tomek
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