Issue #16517 has been reported by MSP-Greg (Greg L).

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Feature #16517: mkmf.rb - changes for Windows ?
https://bugs.ruby-lang.org/issues/16517

* Author: MSP-Greg (Greg L)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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I propose two changes to mkmf.rb to make it more Windows friendly.

1) mingw - `devkit` has been the standard for 'enabling' compile tools in publicly available MinGW builds for quite a while.  Could something like the following be added?  Not sure whether to rescue on LoadError or not, or whether to output anything if it doesn't load.

```ruby
if $mingw
  begin
    require 'devkit'
  rescue
  end
end
```

2) mswin - most compile tools other than msvc will find libraries without a lib prefix.  Note the following code in extconf.rb for OpenSSL:

```ruby
ret = have_library("crypto", "CRYPTO_malloc") &&
  have_library("ssl", "SSL_new")
return ret if ret

if $mswin
  # OpenSSL >= 1.1.0: libcrypto.lib and libssl.lib.
  if have_library("libcrypto", "CRYPTO_malloc") &&
      have_library("libssl", "SSL_new")
    return true
  end
```

If something like the following was added, the above wouldn't be needed:

```ruby
if $mswin
  alias_method :orig_find_library, :find_library
  
  def find_library(lib, func, *paths, &b)
    orig_find_library(lib, func, *paths, b) || orig_find_library("lib#{lib}", func, *paths, b)
  end

  alias_method :orig_have_library, :have_library

  def have_library(lib, func = nil, headers = nil, opt = "", &b)
    orig_have_library(lib, func, headers, opt, b) || orig_have_library("lib#{lib}", func, headers, opt, b)
  end
end
```

Adding something similar to above two items would remove the need for Windows specific build code in many extension gems.




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