From: "luislavena (Luis Lavena)" <luislavena@...>
Date: 2013-12-31T00:42:43+09:00
Subject: [ruby-core:59409] [ruby-trunk - Bug #8358] TestSprintf#test_float	test failuer on mingw32


Issue #8358 has been updated by luislavena (Luis Lavena).

Priority changed from High to Immediate

Hello Nobu, Usa,

This is still happening in 2.1.0 release, and the test is blocking me from releasing RubyInstaller.

We need a response on this, is the test valid or not? can be ignored or the issue needs to be fixed?

Thank you.
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Bug #8358: TestSprintf#test_float test failuer on mingw32
https://bugs.ruby-lang.org/issues/8358#change-43973

Author: phasis68 (Heesob Park)
Status: Assigned
Priority: Immediate
Assignee: nobu (Nobuyoshi Nakada)
Category: build
Target version: 2.1.0
ruby -v: ruby 2.1.0dev (2013-05-01) [i386-mingw32]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN


I noticed TestSprintf#test_float
http://ci.rubyinstaller.org/job/ruby-trunk-x86-test-all/1287/console
  1) Failure:
TestSprintf#test_float [C:/Users/Worker/Jenkins/workspace/ruby-trunk-x86-build/test/ruby/test_sprintf.rb:193]:
[ruby-dev:42551].
<"0x1p+2"> expected but was
<"0x1p+1">.

This failure is due to r40404.

And Actually, this issue is almost same to bug #8299.
ruby_hdtoa function requires 53-bit precision 
but mingw32 compiler is 64-bit precision.

There are 2 possible workarounds.

1. adding  -msse2 -mfpmath=sse flag when compiling.
2. adding  _control87(_PC_53, _MCW_PC) when running.



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