testing the -target option

[Joseph D. Darcy]

On 10/28/2024 8:49 AM, Alan Snyder wrote:
> I’m curious to know how the javac -target option is tested. I can think of several possibilities, but am wondering what actually is done.


You can satisfy your curiosity by looking the the javac regressions 
tests in the OpenJDK repo. Under

https://github.com/openjdk/jdk

see the test/langtools/tools/javac directory hierarchy.


>
> (I did not find any discussion of this issue in the online project docs.)
>
> A few questions:
>
> * Is javac -target required to generate the same byte code as the target javac?

No.

>
> * Is javac -target required to generate the same error messages as the target javac?

No.

>
> * Are there negative tests to verify that language features introduced in later releases are rejected?

Yes.

> * How frequently are the tests typically run?

All the time. The javac tests are part of the "tier 1" tests of OpenJDK 
and are run by the CI systems for (effectively) every push.

-Joe
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