Issue #14448 has been updated by shyouhei (Shyouhei Urabe).


Thank you.  It seems the problem is autoreconf.  I guess it clobbers aclocal.m4 file.
Hang on, I think I can fix it.

----------------------------------------
Bug #14448: Build Failure - MinGW gcc 7.3.0 ~ svn 62220 - RUBY_CHECK_VA_COPY
https://bugs.ruby-lang.org/issues/14448#change-70209

* Author: MSP-Greg (Greg L)
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-02-05 trunk 62224) [x64-mingw32]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
Seem to be having build failures with MinGW / gcc 7.3.0.  Log shown below:

```
==> Starting build()...
ruby 2.6.0dev 2018-02-05 62230
configure: loading site script /etc/config.site
../ruby/configure: line 15109: syntax error near unexpected token `va_copy,'
../ruby/configure: line 15109: `      RUBY_CHECK_VA_COPY(va_copy, va_copy((dst),(src)))'
==> ERROR: A failure occurred in build().
    Aborting...
Command exited with code 1
if "%TEST_SCRIPT%" NEQ "done
```

Thanks, Greg



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