Question

I am trying to copy files befoe compilation (I have two source files with same name so I copy the files to a files with a different name) and delete them at the end of the MAKEFILE. I am trying to do the folliwng but probably there is mismatch in the execution order. How can I do it correctly?

all: copy_dup_files $(dst_dir) $(APP_TARGET_LIB) delete_dup_files

copy_dup_files:  
    @echo "COPYING DUP FILES"
    $(shell cp /aaa/hmac.c /aaa/hmac1.c )
    $(shell cp /bbb/hmac.c /bbb/hmac2.c )

delete_dup_files:
    @echo "DELETING DUP FILES"
    $(shell rm /aaa/hmac1.c )
    $(shell rm /bbb/hmac2.c )

Thanks

Answer 1

The purpose of pjsua_media.c .Shutting down media.. is to produce an output which Make reads. The recipe lines should not have this construct at all.

$(shell)

So, all the # this is evaluated when the Makefile is read value := $(shell echo "Use the shell to produce a value for a variable") # this is evaluated when you say "make foo" foo: echo 'No $$(shell ...) stuff here' stuff in your attempt gets evaluated when the $(shell ...) is read, but before any actual target is executed.

Answer 2

您的makefile试图说/aaa/hmac1.c取决于/aaa/hmac.c。因此我们有：

/aaa/hmac1.c: /aaa/hmac.c
    cp $< $@

/bbb/hmac2.c: /bbb/hmac.c
    cp $< $@

/aaa/hmac1.o /bbb/hmac2.o: %.o: %.c
    gcc $< -o $@

myprog: /aaa/hmac1.o /bbb/hmac2.o
    gcc $^ -o $@

这是干净且并行的安全（对任何makefile的一个很好的测试）。

您可以进行无数的样式改进，例如

摆脱绝对路径
使用符号链接代替复制
自动生成依赖关系（适用于.h文件等）
不要污染源树 - 将所有中间文件（.o和临时.c）放在他们自己的构建文件夹中

和C。＆安培; C。

using MAKEFILE to copy files before compilation and delete them after

2 个答案: