为什么这个makefile删除了我的目标?
问题描述：
一个最小的例子:
%.txt: foo.log
# pass
%.log:
# pass
运行:
$ make a.txt --dry-run
# pass
# pass
rm foo.log
为什么最后一个动作是rm foo.log? 如何摆脱它?
Why the last action is rm foo.log? How to get rid of it?
答
默认情况下，GNU make会删除中间文件.由于％.txt取决于％.log，因此make希望删除.log文件.为了防止这种行为，您可以使用.PRECIOUS或.SECONDARY将它们标记为珍贵.
By default, GNU make removes intermediate files. Since %.txt depends on %.log, make wants to remove the .log file. To prevent that behavior you mark them as precious with .PRECIOUS or .SECONDARY.
.PRECIOUS: foo.log
此外，您可以使用.SECONDARY而不依赖任何文件，从而不会删除任何中间文件.
Also, you can make it so that no intermediate files are ever removed by using .SECONDARY with no dependencies.
.SECONDARY:
请参见GNU的此部分制作手册.
See this section of the GNU make manual.