makefile意外删除目标 [英] makefile unexpectedly removes target

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 rm foo.log ?我该如何摆脱呢?

Why is the last action rm foo.log? How can I get rid of it?

推荐答案

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，您还可以使用.SECONDARY来创建没有依赖项的中间文件.

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.

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