LXR linux/Kbuild

   1#
   2# Kbuild for top-level directory of the kernel
   3# This file takes care of the following:
   4# 1) Generate asm-offsets.h
   5# 2) Check for missing system calls
   6
   7#####
   8# 1) Generate asm-offsets.h
   9#
  10
  11offsets-file := include/asm-$(ARCH)/asm-offsets.h
  12
  13always  := $(offsets-file)
  14targets := $(offsets-file)
  15targets += arch/$(ARCH)/kernel/asm-offsets.s
  16
  17# Default sed regexp - multiline due to syntax constraints
  18define sed-y
  19        "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"
  20endef
  21# Override default regexp for specific architectures
  22sed-$(CONFIG_MIPS) := "/^@@@/{s/^@@@//; s/ \#.*\$$//; p;}"
  23
  24quiet_cmd_offsets = GEN     $@
  25define cmd_offsets
  26        (set -e; \
  27         echo "#ifndef __ASM_OFFSETS_H__"; \
  28         echo "#define __ASM_OFFSETS_H__"; \
  29         echo "/*"; \
  30         echo " * DO NOT MODIFY."; \
  31         echo " *"; \
  32         echo " * This file was generated by Kbuild"; \
  33         echo " *"; \
  34         echo " */"; \
  35         echo ""; \
  36         sed -ne $(sed-y) $<; \
  37         echo ""; \
  38         echo "#endif" ) > $@
  39endef
  40
  41# We use internal kbuild rules to avoid the "is up to date" message from make
  42arch/$(ARCH)/kernel/asm-offsets.s: arch/$(ARCH)/kernel/asm-offsets.c FORCE
  43        $(Q)mkdir -p $(dir $@)
  44        $(call if_changed_dep,cc_s_c)
  45
  46$(obj)/$(offsets-file): arch/$(ARCH)/kernel/asm-offsets.s Kbuild
  47        $(Q)mkdir -p $(dir $@)
  48        $(call cmd,offsets)
  49
  50#####
  51# 2) Check for missing system calls
  52#
  53
  54quiet_cmd_syscalls = CALL    $<
  55      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags)
  56
  57PHONY += missing-syscalls
  58missing-syscalls: scripts/checksyscalls.sh FORCE
  59        $(call cmd,syscalls)
  60