是否可以在 GNU Make 4.3 编译之前运行一次 shell 命令？

Question

应该很简单：我有一个编译和链接静态库的 Makefile。我想实现以下行为：

如果 .c/.h 文件没有更改：

make: Nothing to be done for [target]

如果有变化：

==> Creating target [target]...  
  -> Compiling source files...  
[compiler output goes here]  
  -> Linking static library [target]
==> Finished making: [target]

是的，我确实知道依赖项如何工作以及如何在编译期间生成 .d 文件，我需要的是一种在任何编译完成之前运行 shell 命令 一次 的方法（如果有的话编译）。

Answer 1

PREBUILD_MSG = "$(GREEN)==>$(WHITE) Creating target $(NAME)...$(NOCOLOR)\n"
ifneq ($(findstring $(MAKECMDGOALS), so $(NAMESO)),)
    PREBUILD_MSG = "$(GREEN)==>$(WHITE) Creating target $(NAMESO)...$(NOCOLOR)\n"
endif
PRECOMPILE_MSG = "  $(BLUE)->$(NOCOLOR) Compiling source files...\n"

all: $(NAME)
$(NAME): $(OBJS)
    @printf $(PREBUILD_MSG)
    @printf "  $(BLUE)->$(NOCOLOR) Creating static library archive...\n"
    @$(AR) $@ $?
    @printf "$(GREEN)==>$(WHITE) Finished making: $(NAME)\n"
    @-rm -f .status
.PHONY: all

so: CFLAGS += -fpic
so: $(NAMESO)
$(NAMESO): $(OBJS)
    @printf $(PREBUILD_MSG)
    @printf "  $(BLUE)->$(NOCOLOR) Creating dynamically linked shared library...\n"
    @$(CC) -shared -o $@ $^
    @printf "$(GREEN)==>$(WHITE) Finished making: $(NAMESO)\n"
    @-rm -f .status
.PHONY: so

$(OBJDIR)/%.o: %.c $(DEPDIR)/%.d | $(OBJDIR) $(DEPDIR)
    @printf $(PREBUILD_MSG)
    @printf $(PRECOMPILE_MSG)
    @$(eval PREBUILD_MSG="")
    @$(eval PRECOMPILE_MSG="")
    $(CC) $(CFLAGS) $(INCLUDE) -MMD -MF $(DEPDIR)/$*.tmp -c -o $@ $<
    @$(POST_COMPILE)