[ruby-core:81527] [Ruby trunk Feature#13570] Using mkmf for ruby/spec C API specs

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


Ran a MinGW build on `ruby 2.5.0dev 2017-06-02 58998`.  Ran tests three ways:

1. `make test-spec` - pkg/install bin folder in path
2. `make test-spec` - pkg/install bin folder not in path
3. `mspec` - pkg/install bin folder in path

All three ran with expected results.  Although I'd prefer that `IO.copy_stream` be used, neither `fs.rb` or `spec_helper.rb` were patched to use it.

Hence, good job and thanks...

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Feature #13570: Using mkmf for ruby/spec C API specs
https://bugs.ruby-lang.org/issues/13570#change-65233

* Author: Eregon (Benoit Daloze)
* Status: Assigned
* Priority: Normal
* Assignee: cruby-windows
* 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.

---Files--------------------------------
spec_helper.rb (2.22 KB)
spec_helper.rb (2.24 KB)


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