所以一般情况下，你只需要 git grep 'cmd.* = CODE'

找到CODE。

获取scripts/Makefile.build定义的所有代码 make | grep -E '^ ' | sort -uk1,1

CC和CC [M]

名单： quiet_cmd_cc_o_c = CC $(quiet_modtag) [email protected]

cmd_cc_o_c = $(CC) $(c_flags) -c -o [email protected] $< $(real-objs-m) : quiet_modtag := [M]

$(real-objs-m:.o=.i) : quiet_modtag := [M]

$(real-objs-m:.o=.s) : quiet_modtag := [M]

$(real-objs-m:.o=.lst): quiet_modtag := [M]

$(obj-m) : quiet_modtag := [M]

据当时称为通过： $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE

[...]

$(call if_changed_rule,cc_o_c)

define rule_cc_o_c

[...]

$(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \

其中if_changed_rule在scripts/Kbuild.include定义为： if_changed_rule = $(if $(strip $(any-prereq) $(arg-check)), \

@set -e; \

$(rule_$(1)))

和Kbuild.include被包括在顶层的Makefile中。

LD

有几个版本，但最简单的似乎是： quiet_cmd_link_o_target = LD [email protected]

cmd_link_o_target = $(if $(strip $(obj-y)),\

$(LD) $(ld_flags) -r -o [email protected] $(filter $(obj-y), $^) \

$(cmd_secanalysis),\

rm -f [email protected]; $(AR) rcs$(KBUILD_ARFLAGS) [email protected])

$(builtin-target): $(obj-y) FORCE

$(call if_changed,link_o_target)

和scripts/Kbuild.include： # Execute command if command has changed or prerequisite(s) are updated.

#

if_changed = $(if $(strip $(any-prereq) $(arg-check)), \

@set -e; \

$(echo-cmd) $(cmd_$(1)); \

printf '%s\n' '[email protected] := $(make-cmd)' > $(dot-target).cmd)