[ruby-core:81200] [Ruby trunk Feature#13570] Using mkmf for ruby/spec C API specs

Issue #13570 has been updated by MSP-Greg (Greg L).


> Does mkmf works well on Windows?

I'm not a c type.  With MinGW builds, I've got 89 mkmf.log files in the build dir, and [test-all results](https://msp-greg.github.io/file.mingw_test-all.html) are consistent and reasonable low.  I'm guessing that means yes.

FYI, I ran test-spec with -j on 58760, and it matched (or very closely matched) results without -j.  test-all has the same results, but assertions and skips are different.

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Feature #13570: Using mkmf for ruby/spec C API specs
https://bugs.ruby-lang.org/issues/13570#change-64855

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

I am thinking to use mkmf to compile the C API specs.

https://github.com/ruby/ruby/blob/trunk/spec/rubyspec/optional/capi/spec_helper.rb
is getting pretty complex and hard to maintain.

I have a few questions:
* Does mkmf works well on Windows?
* What is a good way to compile a single .c file with mkmf to a given library file in another directory?

I tried this but I am not sure it's correct:

~~~ ruby
def compile_extension(name)
  objdir = object_path
  ext = "#{name}_spec"
  lib = "#{objdir}/#{ext}.#{RbConfig::CONFIG['DLEXT']}"

  require 'mkmf' # TODO: probably best to use a subprocess to avoid polluting the namespace
  Dir.chdir(objdir) do
    $srcs = ["#{extension_path}/#{ext}.c"]
    $objs = ["#{extension_path}/#{ext}.o"] # should probably be in objdir but that does not seem to work
    create_makefile(ext)
    system "make"
  end

  lib
end
~~~

Alternatively, we can copy the needed files to a temporary directory, build there and copy the shared library back.
It's a bit more work but not a big deal either.



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