Re: build -->/usr/src/linux

[Jamie Lokier <lk@tantalophile.demon.co.uk>]

Miquel van Smoorenburg wrote:
> .. but there should be a cleaner way to get at the CFLAGS used
> to compile the kernel.

There is a way though I'd not call it clean.  Here is an extract from
the Makefile I am using for separately-distributed modules.  It should
work with kernels 2.0 to 2.4, all supported architectures.

include $(KERNEL_SOURCE)/.config

CPPFLAGS := -DMODULE -D__KERNEL__ -nostdinc -I$(KERNEL_SOURCE)/include
CPPFLAGS += -I$(shell gcc -print-file-name=include)
CFLAGS	 := $(CPPFLAGS) -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
AFLAGS	 := -D__ASSEMBLY__ $(CPPFLAGS)

# For older kernels.
ifneq (,$(strip $(shell grep '^[ 	]*SMP[ 	]*:\?=[ 	]*[^ 	]' $(KERNEL_SOURCE)/Makefile)))
CONFIG_SMP=y
endif
ifdef CONFIG_SMP
CFLAGS += -D__SMP__
AFLAGS += -D__SMP__
endif

include $(KERNEL_SOURCE)/arch/$(ARCH)/Makefile

CFLAGS += $(shell if $(CC) -fno-strict-aliasing -S -o /dev/null -xc /dev/null >/dev/null 2>&1; then echo "-fno-strict-aliasing"; fi)