Hiroshi SHIBATA fbb4dd0405 [Win32] Define warnflags in RbConfig::CONFIG
On mswin, config.status did not contain warnflags, so
RbConfig::CONFIG["warnflags"] returned nil.  Extensions that modify
warnflags in extconf.rb, such as oj and ox, failed with NoMethodError.
Define it from WARNFLAGS as on other platforms.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-27 12:00:16 +09:00
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