Issue #12249 has been updated by Nobuyoshi Nakada.

Backport changed from 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN to 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED

Also `Math.lgamma(-0.0)`.

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Bug #12249: Math.gamma(-0.0) should return -Infinity
https://bugs.ruby-lang.org/issues/12249#change-57947

* Author: Benoit Daloze
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.4p230 (2015-12-16 revision 53155) [i386-mingw32]
* Backport: 2.1: REQUIRED, 2.2: REQUIRED, 2.3: REQUIRED
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On Windows, Math.gamma(-0.0) returns +Infinity instead of -Infinity,
which is the correct result according to tgamma(3) and the behavior on other platforms.

Is this OK to fix in Ruby?
There is already a similar fix for #10642.



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