linux-yocto/Kbuild
Thomas Gleixner 6752ed90da Kbuild: allow arch/xxx to use a different source path
Preparatory patch for the source merge of arch/i386 and arch/x86_64
into arch/x86. This allows to keep the original arch directories as
stubs for the main Makefiles, Kconfigs et. al during the transition
phase while having the code in the new arch/x86 directory.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-11 11:11:36 +02:00

1.6 KiB

Kbuild for top-level directory of the kernel

This file takes care of the following:

1) Generate asm-offsets.h

2) Check for missing system calls

1) Generate asm-offsets.h

offsets-file := include/asm-$(ARCH)/asm-offsets.h

always := $(offsets-file) targets := $(offsets-file) targets += arch/$(SRCARCH)/kernel/asm-offsets.s clean-files := $(addprefix $(objtree)/,$(targets))

Default sed regexp - multiline due to syntax constraints

define sed-y "/^->/{s:^->[^ ]* [$$#][^ ]* .*:#define \1 \2 / \3 */:; s:->::; p;}" endef

Override default regexp for specific architectures

sed-$(CONFIG_MIPS) := "/^@@@/{s/^@@@//; s/ #.*$$//; p;}"

quiet_cmd_offsets = GEN $@ define cmd_offsets (set -e;
echo "#ifndef ASM_OFFSETS_H";
echo "#define ASM_OFFSETS_H";
echo "/*";
echo " * DO NOT MODIFY.";
echo " *";
echo " * This file was generated by Kbuild";
echo " *";
echo " */";
echo "";
sed -ne $(sed-y) $<;
echo "";
echo "#endif" ) > $@ endef

We use internal kbuild rules to avoid the "is up to date" message from make

arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c FORCE $(Q)mkdir -p $(dir $@) $(call if_changed_dep,cc_s_c)

$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild $(Q)mkdir -p $(dir $@) $(call cmd,offsets)

2) Check for missing system calls

quiet_cmd_syscalls = CALL $< cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags)

PHONY += missing-syscalls missing-syscalls: scripts/checksyscalls.sh FORCE $(call cmd,syscalls)