Linux 在 Makefile 规则中管道 stdout 和 stderr
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Piping stdout and stderr inside a Makefile rule
提问by Xyand
I want to pipe the output of a script to a different program. Something I would normally do using these two forms:
我想将脚本的输出通过管道传输到不同的程序。我通常会使用这两种形式做的事情：
python test.py 2>&1 | pyrg
python test.py |& pyrg
My problem is that it doesn't work from inside a makefile:
我的问题是它在 makefile 中不起作用：
[Makefile]
test:
python test.py 2>&1 | pyrg [doesn't work]
I wish to avoid writing a script file that does the work.
我希望避免编写完成工作的脚本文件。
Edit:
编辑：
This seems like a pyrgissue:
这似乎是一个pyrg问题：
python test.py 2>&1 | tee test.out // Writes to the file both stderr and stdout
cat test.out | pyrg // Works fine!
python test.py 2>&1 | pyrg // pyrg behaves as if it got no input
This is a bad solution for me as I never get to the catpart in case of a test failure (everything is inside a Makefile rule)
这对我来说是一个糟糕的解决方案，因为cat在测试失败的情况下我永远不会参与其中（一切都在 Makefile 规则中）
采纳答案by Xyand
It doesn't explain why the straightforward approaches don't work, but it does the trick:
它没有解释为什么直截了当的方法不起作用，但它确实有效：
[Makefile]
test:
python test.py >test.out 2>&1; pyrg <test.out
回答by Lucas
I stumbled upon this question with the same problem and wasn't satisfied with the answer. I had a binary TLBNthat failed on test case example2.TLBN.
我偶然发现了这个问题，但对答案并不满意。我有一个TLBN在测试用例上失败的二进制文件example2.TLBN。
This is what my make file looked at first.
这是我的 make 文件首先查看的内容。
make:
./TLBN example2.TLBN > ex2_output.txt
Which failed with the error message I was expecting and halting the make process.
失败并显示我期望的错误消息并停止制作过程。
This is my fix:
这是我的修复：
make:
-./TLBN example2.TLBN > ex2_output.txt 2>&1
Note the -at the beginning of the line which tells make to ignore any output to stderr.
请注意该-行的开头，它告诉 make 忽略对 stderr 的任何输出。
Hope this helps someone that has a similar problem.
希望这可以帮助有类似问题的人。
回答by user5359531
Strangely, I had the same problem, and solved it like this:
奇怪的是，我遇到了同样的问题，并像这样解决了它：
check-errors:
check-for-errors.sh &> errors.txt
I am not really sure why 2>&1 >errors.txtdid not work here, but &>did
我不确定为什么2>&1 >errors.txt在这里不起作用，但&>确实如此
