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Kbuild
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# # Kbuild for top-level directory of the kernel # This file takes care of the following: |
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# 1) Generate bounds.h |
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# 2) Generate timeconst.h # 3) Generate asm-offsets.h (may need bounds.h and timeconst.h) # 4) Check for missing system calls |
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# 5) Generate constants.py (may need bounds.h) |
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# Default sed regexp - multiline due to syntax constraints define sed-y "/^->/{s:->#\(.*\):/* \1 */:; \ s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \ s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ s:->::; p;}" endef |
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# Use filechk to avoid rebuilds when a header changes, but the resulting file # does not define filechk_offsets |
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(set -e; \ |
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echo "#ifndef $2"; \ echo "#define $2"; \ |
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echo "/*"; \ echo " * DO NOT MODIFY."; \ echo " *"; \ echo " * This file was generated by Kbuild"; \ |
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echo " */"; \ echo ""; \ |
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sed -ne $(sed-y); \ |
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echo ""; \ |
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echo "#endif" ) |
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endef |
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##### # 1) Generate bounds.h bounds-file := include/generated/bounds.h always := $(bounds-file) |
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targets := kernel/bounds.s |
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# We use internal kbuild rules to avoid the "is up to date" message from make kernel/bounds.s: kernel/bounds.c FORCE $(Q)mkdir -p $(dir $@) $(call if_changed_dep,cc_s_c) |
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$(obj)/$(bounds-file): kernel/bounds.s FORCE $(call filechk,offsets,__LINUX_BOUNDS_H__) |
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##### |
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# 2) Generate timeconst.h timeconst-file := include/generated/timeconst.h |
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targets += $(timeconst-file) quiet_cmd_gentimeconst = GEN $@ define cmd_gentimeconst (echo $(CONFIG_HZ) | bc -q $< ) > $@ endef define filechk_gentimeconst (echo $(CONFIG_HZ) | bc -q $< ) endef $(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE $(call filechk,gentimeconst) ##### # 3) Generate asm-offsets.h |
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# |
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offsets-file := include/generated/asm-offsets.h |
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always += $(offsets-file) |
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targets += arch/$(SRCARCH)/kernel/asm-offsets.s |
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# We use internal kbuild rules to avoid the "is up to date" message from make |
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arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \ |
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$(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE |
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$(Q)mkdir -p $(dir $@) $(call if_changed_dep,cc_s_c) |
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$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE $(call filechk,offsets,__ASM_OFFSETS_H__) |
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##### |
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# 4) Check for missing system calls |
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# |
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always += missing-syscalls targets += missing-syscalls |
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quiet_cmd_syscalls = CALL $< |
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cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) |
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missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE |
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$(call cmd,syscalls) |
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##### # 5) Generate constants for Python GDB integration # extra-$(CONFIG_GDB_SCRIPTS) += build_constants_py build_constants_py: $(obj)/$(timeconst-file) $(obj)/$(bounds-file) @$(MAKE) $(build)=scripts/gdb/linux $@ |
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# Keep these three files during make clean no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file) |