[ruby-core:86536] [Ruby trunk Bug#14686] Windows - uninitialized constant Fiddle::Function::STDCALL, test issue

Issue #14686 has been reported by MSP-Greg (Greg L).

----------------------------------------
Bug #14686: Windows - uninitialized constant Fiddle::Function::STDCALL, test issue
https://bugs.ruby-lang.org/issues/14686

* Author: MSP-Greg (Greg L)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-04-12 trunk 63140) [x64-mingw32]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
While testing the test/ruby folder with frozen-string, I came across a few issues.  More later...

I had the following failures in test_rubyoptions.rb, which were due to output on stderr:

```
  3) Failure:
TestRubyOptions#test_frozen_string_literal_debug [E:/GitHub/ruby/test/ruby/test_rubyoptions.rb:986]:
[["--disable=gems", "--enable-frozen-string-literal", "--debug"], "+\"foo\#{123}bar\" << \"bar\""].

1. [2/2] Assertion for "stderr"
   | <[]> expected but was
   | <["Exception `NameError' at C:/ruby26_64/lib/ruby/2.6.0/fiddle/import.rb:160 - uninitialized constant Fiddle::Function::STDCALL"]>.

  4) Failure:
TestRubyOptions#test_debug [E:/GitHub/ruby/test/ruby/test_rubyoptions.rb:83]:

1. [2/2] Assertion for "stderr"
   | <[]> expected but was
   | <["Exception `NameError' at C:/ruby26_64/lib/ruby/2.6.0/fiddle/import.rb:160 - uninitialized constant Fiddle::Function::STDCALL"]>.

```

The code in questions is https://github.com/ruby/ruby/blob/trunk/ext/fiddle/lib/fiddle/import.rb#L158-L164, as follows:

```ruby
CALL_TYPE_TO_ABI = Hash.new { |h, k|
  raise RuntimeError, "unsupported call type: #{k}"
}.merge({ :stdcall => (Function::STDCALL rescue Function::DEFAULT),
          :cdecl   => Function::DEFAULT,
          nil      => Function::DEFAULT
        }).freeze
private_constant :CALL_TYPE_TO_ABI
```

Changing it to the following removed failures:

```ruby
CALL_TYPE_TO_ABI = Hash.new { |h, k|
  raise RuntimeError, "unsupported call type: #{k}"
}.merge({ :stdcall => defined?(Function::STDCALL) ? Function::STDCALL :
                      Function::DEFAULT,
          :cdecl   => Function::DEFAULT,
          nil      => Function::DEFAULT
        }).freeze
private_constant :CALL_TYPE_TO_ABI
```

I haven't worked much with Fiddle, but I checked for the existence of STDCALL in the listed ruby-loco build, the 2.5.1 RubyInstaller2 build, and a recent local vc14 trunk build.  It did not exist in any of the three builds.  Hence, I don't know if this is a correct fix...

Patch attached.  Thanks, Greg

---Files--------------------------------
fiddle_import.rb.patch (666 Bytes)


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