即使前提条件失败，Makefile目标能否调用命令? [英] Can a Makefile target invoke commands even if a prerequisite fails?

问题描述

这里是一个骨架的Makefile，目的是为了更轻松地描述问题:

all_tests : unit_tests other_tests_1 other_tests_2 ... other_tests_N

unit_tests : set1_summary.txt set2_summary.txt ... setN_summary.txt

%_summary.txt : %_details.txt
    perl createSummary.pl --in $^ -out $@

%_details.txt : test_harness
    ./test_harness --test-set $*

因此，我有一个测试运行程序，它会生成带有详细结果的文件，然后是用于创建摘要文件的过滤机制.

现在，如果测试集中的任何项目失败，则测试运行器应用程序将返回错误代码，这将正确终止"all_tests"目标，并且从不调用other_test目标.但是，我想无条件运行详细信息->摘要转换，因为即使失败的测试运行也很重要.

我尝试了一些不同的变体，但是我唯一可以使用的方法是将整个命令链包装到Perl脚本中，存储掉第一个命令的结果，并将其用作整个脚本的返回值. /p>

但是，这似乎不是一个很整洁的解决方案，特别是因为实际"命令集比该框架显示的要复杂一些.您是否知道任何纯粹基于GNU Make的方法来实现这一目标?

解决方案

您可能有一条特殊的规则，该规则以递归方式两次调用Make，如下所示:

.PHONY: test
test :
    make all_tests ; make summary

唯一的缺点是，顶层make进程的退出状态将不再表示测试成功/失败，但是如果您想使用$编写一些额外的脚本，甚至可以修复该问题.外壳变量.

Here's a skeleton Makefile just to make it easier to describe the problem:

all_tests : unit_tests other_tests_1 other_tests_2 ... other_tests_N

unit_tests : set1_summary.txt set2_summary.txt ... setN_summary.txt

%_summary.txt : %_details.txt
    perl createSummary.pl --in $^ -out $@

%_details.txt : test_harness
    ./test_harness --test-set $*

So I have a test runner that produces a file with detailed results, and then a filtering mechanism to create a summary file.

Now, the test runner application returns an error code if any of the items in the test set fails, which will correctly abort the "all_tests" target and never invoke the other_test targets. However, I would like to run the details -> summary transformation unconditionally, since that is relevant even for a failed test run.

I've tried some different variants but the only method I could get to work was wrapping the whole command chain into a Perl script, storing away the result of the first command and using that as return value for the whole script.

But that does not feel like a very neat solution, especially since the "actual" command set is a bit more complex than what this skeleton shows. Do you know any purely GNU Make-based method to accomplish this?

解决方案

You could have a special rule that invokes Make recursively twice, like this:

.PHONY: test
test :
    make all_tests ; make summary

The only downside is that the exit status of the top make process will no longer indicate success/failure of tests, but you could even fix that if you wanted to by a little extra scripting using the $? shell variable.

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