LXR linux/Kbuild

   1#
   2# Kbuild for top-level directory of the kernel
   3# This file takes care of the following:
   4# 1) Generate bounds.h
   5# 2) Generate asm-offsets.h (may need bounds.h)
   6# 3) Check for missing system calls
   7
   8# Default sed regexp - multiline due to syntax constraints
   9define sed-y
  10        "/^->/{s:->#\(.*\):/* \1 */:; \
  11        s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
  12        s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
  13        s:->::; p;}"
  14endef
  15
  16# Use filechk to avoid rebuilds when a header changes, but the resulting file
  17# does not
  18define filechk_offsets
  19        (set -e; \
  20         echo "#ifndef $2"; \
  21         echo "#define $2"; \
  22         echo "/*"; \
  23         echo " * DO NOT MODIFY."; \
  24         echo " *"; \
  25         echo " * This file was generated by Kbuild"; \
  26         echo " */"; \
  27         echo ""; \
  28         sed -ne $(sed-y); \
  29         echo ""; \
  30         echo "#endif" )
  31endef
  32
  33#####
  34# 1) Generate bounds.h
  35
  36bounds-file := include/generated/bounds.h
  37
  38always  := $(bounds-file)
  39targets := kernel/bounds.s
  40
  41# We use internal kbuild rules to avoid the "is up to date" message from make
  42kernel/bounds.s: kernel/bounds.c FORCE
  43        $(Q)mkdir -p $(dir $@)
  44        $(call if_changed_dep,cc_s_c)
  45
  46$(obj)/$(bounds-file): kernel/bounds.s FORCE
  47        $(call filechk,offsets,__LINUX_BOUNDS_H__)
  48
  49#####
  50# 2) Generate asm-offsets.h
  51#
  52
  53offsets-file := include/generated/asm-offsets.h
  54
  55always  += $(offsets-file)
  56targets += arch/$(SRCARCH)/kernel/asm-offsets.s
  57
  58# We use internal kbuild rules to avoid the "is up to date" message from make
  59arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
  60                                      $(obj)/$(bounds-file) FORCE
  61        $(Q)mkdir -p $(dir $@)
  62        $(call if_changed_dep,cc_s_c)
  63
  64$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
  65        $(call filechk,offsets,__ASM_OFFSETS_H__)
  66
  67#####
  68# 3) Check for missing system calls
  69#
  70
  71always += missing-syscalls
  72targets += missing-syscalls
  73
  74quiet_cmd_syscalls = CALL    $<
  75      cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)
  76
  77missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
  78        $(call cmd,syscalls)
  79
  80# Keep these two files during make clean
  81no-clean-files := $(bounds-file) $(offsets-file)
  82