[ruby-core:82811] [Ruby trunk Bug#13903] cant compile ruby on windows

Issue #13903 has been reported by rocifier (Ryan O'Connor).

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Bug #13903: cant compile ruby on windows
https://bugs.ruby-lang.org/issues/13903

* Author: rocifier (Ryan O'Connor)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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steps:

1. open VS2015 x86 Native Tools Command Prompt
2. follow instructions in https://github.com/ruby/ruby/blob/trunk/win32/README.win32

most of the compilation completes including producing .lib files, but nmake finally errors out at this stage and the whole process doesn't complete:

```
compiling c:/Repositories/ruby/ext/bigdecimal/bigdecimal.c
bigdecimal.c
linking shared-object bigdecimal.so
   Creating library bigdecimal-i386-mswin32_140.lib and object bigdecimal-i386-mswin32_140.exp
bigdecimal.obj : error LNK2001: unresolved external symbol _rb_cNumeric
bigdecimal.obj : error LNK2001: unresolved external symbol _rb_eArgError
bigdecimal.obj : error LNK2001: unresolved external symbol _rb_eTypeError
bigdecimal.obj : error LNK2001: unresolved external symbol _rb_eZeroDivError
bigdecimal.obj : error LNK2001: unresolved external symbol _rb_eFloatDomainError
bigdecimal.obj : error LNK2001: unresolved external symbol _rb_eMathDomainError
../../.ext/i386-mswin32_140/bigdecimal.so : fatal error LNK1120: 6 unresolved externals
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\cl.EXE"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: 'cd' : return code '0x2'
```



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