CODEWITHSUNDEEP
clojure
Kineolyan
Kineolyan

Reputation: 743

Is it possible to set `*warn-on-reflection* in deps.edn?

With leiningen, it is possible to reconfigure global vars within a profile [1]. This was convenient to enable options like *warn-on-reflection* for a whole module only during special stages like tests. Looking for the same with Clojure CLI, I could not find an explicit way to do so. Looking at various commands like compiling clojure code that requires the following clojure -M -e "(compile 'some.namespace)", it is possible that I have to resort to a similar trick.

For the record, various sources like [2] suggest to put it in each file, but it is quite cumbersome.

[1] https://github.com/technomancy/leiningen/blob/6c8cdeebb07972f2a24b95bfc64b339c9895d3bc/sample.project.clj#L285-L290
[2] https://github.com/clj-easy/graal-docs#reflection

Upvotes: 3

Views: 696

Answers (1)

Kineolyan
Kineolyan

Reputation: 743

After find later this other SO [1], it seems the way to do it is as follow:

; deps.edn
{:aliases {:my-profile {:main-opts ["-e" "(set! *warn-on-reflection* true)"]}}}

It is correctly received by other -e command as seen in this test:

clojure -Mmy-profile -e '(println "warn-on-reflection =" *warn-on-reflection*)'
; => warn-on-reflection = true

One drawback reported in the comments is that only one :main-opts option from different aliases can be applied - last one wins.
There is one hope for the future: one question on ask.clojure.org [2] asking for a JVM option.

I hope this will help others that struggled like me to make the conversion.

[1] How to set default value for *print-length* in deps.edn
[2] https://ask.clojure.org/index.php/3787/theres-enable-warn-reflection-from-command-running-clojure

Upvotes: 1

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