为什么.SECONDARY不能与模式(％)一起使用，而.PRECIOUS可以呢? [英] Why .SECONDARY does not work with patterns (%) while .PRECIOUS does?
问题描述
我的问题是更好地了解我在制作过程中以及.SECONDARY用途与.PRECIOUS遗漏的内容，而不是让我的脚本正常工作，因为它已经可以正常工作了.
My question is to understand better what i missed in make process and .SECONDARY purpose vs .PRECIOUS, not to get my script working, since it does work already.
我正在使用make在文件上打开emacs编辑器(java，但与此问题无关)，或者使用模板创建它(如果不存在).
I am using make to either open a emacs editor on a file ( java but irrelevant for purpose of this question ) or to create it with a template if not existing.
如果它与现有文件配合得很好，在使用生成的文件时，该文件将在最后被删除.
If it works well with existing files, when using generated file it is removed at the end.
我在.SECONDARY中添加了先决条件，但没有帮助，我不得不在.PRECIOUS中添加它.
I added prerequisite in .SECONDARY but didn't help, i had to add it in .PRECIOUS.
这是一个问题，为什么它不能在.SECONDARY中工作?.
根据我在SO上的发现 .SECONDARY不适用于模式(％)，但是即使知道我想知道它是设计使然还是制造中的错误，也是如此. (.SECONDARY用于使用GNU Make的图案规则和 Makefile模式规则要么忽略假音规则或自发删除输出文件)
From what i found on SO .SECONDARY does not work with patterns ( % ), but even with knowing that i wonder if it is by design or if it is a bug in make. ( .SECONDARY for a pattern rule with GNU Make and Makefile pattern rule either ignores phony rule or spontaneously deletes output file )
以下是我的Makefile的精简内容，以重现我的问题(请创建com/stackoverflow/question目录进行测试).
Here a stripped down content of my Makefile to reproduce my problem ( please create a com/stackoverflow/question directory to test it ).
PACKAGE=com.stackoverflow.question
PACKAGE_DIR=$(subst .,/,$(PACKAGE))
OUT=out
clean:
find $(OUT) -name "*.class" -type f -print0|xargs -0 rm
# does not work : deleted at end due to intermediate file removal.
$(PACKAGE_DIR)/%.java:
@echo "package com.stackoverflow.question;\npublic class $(subst .java,,$(subst $(PACKAGE_DIR)/,,$@))\n{\n /** TODO */ \n}" >$@
work/%: $(PACKAGE_DIR)/$(subst work/,,%).java
emacs $<
.PHONY: clean work/%
# tried to avoid intermediate file removal : does not work
.SECONDARY: $(PACKAGE_DIR)/%.java
# if not commented this does work : once precious intermediate file is not removed.
#.PRECIOUS: $(PACKAGE_DIR)/%.java
尝试
开始工作/SoTest
我知道这是标记为中间的.
I understand this is flagged intermediate.
然后在SO中寻找，我尝试将其设置为.SECONDARY:目标列表:也不起作用.
then looking in SO i tried to set it in .SECONDARY: target list : does not work either.
查看我发现的make源代码，该代码在此上下文中完成了对make中间文件的删除:
looking at make source code i spotted that make intermediate files removal is done within this context :
if (f->intermediate && (f->dontcare || !f->precious)
&& !f->secondary && !f->cmd_target)
所以我将文件设置为.PRECIOUS:现在可以使用了.
so i set my file in .PRECIOUS: and now it works.
它显示到控制台:
com/stackoverflow/question/SoTest.java
com/stackoverflow/question/SoTest.java
它使用正确的模板运行emacs，因此可以正常创建 在这里我退出emacs
并在末尾删除文件
and it removes the file at the end
rm com/stackoverflow/question/SoTest.java
rm com/stackoverflow/question/SoTest.java
最后的删除是由于中间文件，可以在make的-d选项中看到
Removal at end is due to intermediate file, this can be seen with -d option on make
LANG = C使-d正常工作/SoTest
LANG=C make -d work/SoTest
...
Must remake target 'work/SoTest'.
emacs com/stackoverflow/question/SoTest.java
Putting child 0xc3b580 (work/SoTest) PID 20681 on the chain.
Live child 0xc3b580 (work/SoTest) PID 20681
Reaping winning child 0xc3b580 PID 20681
Removing child 0xc3b580 PID 20681 from chain.
Successfully remade target file 'work/SoTest'.
Removing intermediate files...
rm com/stackoverflow/question/SoTest.java
要使其正常运行，我需要取消对.PRECIOUS段落的注释.
To have it working i need to uncomment the .PRECIOUS paragraph.
制作--version
GNU Make 4.0
Construit pour x86_64-pc-linux-gnu
Copyright (C) 1988-2013 Free Software Foundation, Inc.
Licence GPLv3+ : GNU GPL version 3 ou ultérieure <http://gnu.org/licenses/gpl.html>
Ceci est un logiciel libre : vous êtes autorisé à le modifier et à la redistribuer.
Il ne comporte AUCUNE GARANTIE, dans la mesure de ce que permet la loi.
推荐答案
为什么.SECONDARY不能与模式(％)一起使用而.PRECIOUS可以呢?"的答案是 此处 :文件显示
The answer to "Why .SECONDARY does not work with patterns (%) while .PRECIOUS does?" is here: the document says
您还可以将隐式规则的目标模式(例如'％.o')列出为特殊目标.PRECIOUS的必备文件
You can also list the target pattern of an implicit rule (such as ‘%.o’) as a prerequisite file of the special target .PRECIOUS
，但关于.SECONDARY则不这样说.但是对于少数显式例外，没有一个特殊的目标接受模式.
but does not say this about .SECONDARY. But for the few explicit exceptions, none of the special targets accept patterns.
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