CODEWITHSUNDEEP
testingemacs
rneatherway
rneatherway

Reputation: 553

How to make Emacs byte-compilation warnings errors

In my continuous integration testing for my emacs package fsharp-mode, I am adding byte-compilation to the tests, in order to have immediate feedback. I am roughly using:

 emasc -batch batch-byte-compile *.el

This returns non-zero if there is an error, but not if it is just a warning. I would like to be alerted also if there are any warnings, as this may include calls to undefined functions (which has happened before thanks to a typo).

So: how can I obtain a non-zero return code in case of compilation warnings?

Upvotes: 5

Views: 536

Answers (1)

user355252
user355252

Reputation:

You can set byte-compile-error-on-warn to a non-nil value, as in:

$ emacs -Q --batch \
    --eval '(setq byte-compile-error-on-warn t)' \
    -f batch-byte-compile *.el

The byte compiler now stops at the first warning, though, so you should make this setting optional in your Makefile, and only use it in your CI setup.

If you need more sophisticated control than that, you have to write your own post-processor, e.g. a Python script that parses the output of the byte compiler and adjusts the exit code and/or output accordingly, or write your own batch-byte-compile variant that does more sophisticated processing.

Upvotes: 5

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