Issue #13620 has been updated by Eregon (Benoit Daloze).


@normalperson wrote in ruby-core:87864:
> mkmf works fine with everything in ext/ without install, so I
> expect mjit to work, too.  I will let Nobu figure it out.

FWIW, mkmf.rb is a famous example for terrible hacks to accommodate the build layout :p
There is this $extmk global variable and ~20 conditions based on it in lib/mkmf.rb which makes the code unreadable and fragile.
Due to that, running mkmf.rb needs more hacks for testing in tree (and shows confusing behavior without it):
https://github.com/ruby/ruby/blob/d41baaee9f4cb725f82d74fc4978d923e6e63cbf/spec/ruby/optional/capi/spec_helper.rb#L3-L4
There is even a hook on the global variable, which executes all sort of things on the first assignment, regardless of the value set:
https://github.com/ruby/ruby/blob/d41baaee9f4cb725f82d74fc4978d923e6e63cbf/tool/fake.rb#L37-L70

I think one solution here is to make building in-tree C extensions more similar to external C-extensions.
It's basically what TruffleRuby does, for openssl/zlib/syslog/psych and $extmk is just always `false`.

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Feature #13620: Simplifying MRI's build system: always make install
https://bugs.ruby-lang.org/issues/13620#change-72889

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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Hello all,

I've been bitten recently when modifying ruby/spec or in #13570 by the sheer number of different configurations to build and test in MRI.
Currently, I know 4 of them, and I can tell you it is a big headache to make it work on all of them:
* in-source-dir build, running tool/runruby.rb
* in-source-dir build, running the installed ruby
* out-of-source build, running tool/runruby.rb
* out-of-source build, running the installed ruby

I just compiled latest MRI this morning, and here are the times:
* time make -j 8:
make -j 8  373.22s user 30.88s system 404% cpu 1:39.99 total
* time make -j 8 install-nodoc
make -j 8 install-nodoc  3.29s user 0.55s system 259% cpu 1.477 total

So I am wondering, should we just test with the installed ruby since installing it takes only marginally more time than building?

The current complexity of runruby.rb, the generated ./rbconfig.rb, etc, all to support testing from the built ruby seems not worth it.
It also means all the tests need to accommodate this different layout and are essentially testing a ruby layout that nobody uses in production.
On the other hand, testing the installed ruby would test something which is much closer to what is released and used in production,
and massively simplify the setup to test by making installed layout assumptions hold (e.g.: RbConfig.ruby points to the current ruby and ruby needs no flags to execute correctly).

Did I miss something?

I also wish we could choose one of in-source/out-of-source and not having to support both, but let's talk about make/make install first.



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