From: "Christian Höltje" <redmine@...>
Date: 2010-03-24T23:08:23+09:00
Subject: [ruby-core:28927] [Bug #3006] Compiling ext/etc problems (windows)

Bug #3006: Compiling ext/etc problems (windows)
http://redmine.ruby-lang.org/issues/show/3006

Author: Christian H��ltje
Status: Open, Priority: Normal
Category: build
ruby -v: 1.9.1-p376

This is while compiling ruby for windows (i386 & x86_64) using Visual Studio 8 (2005).

I get the following error in x86_64:
LIBCMT.lib(getenv.obj) : error LNK2005: getenv already defined in msvcr80-ruby19
1.lib(msvcr80-ruby191.dll)

I fixed this by adding -nodfeaultlib:libcmt to DLDFLAGS in extconf.rb

I then get:
LINK : error LNK2001: unresolved external symbol __DllMainCRTStartup@12

I fixed that by adding /noentry.  Which I assume is the correct behavior.

In i386, I only get the LNK2001 error.

So I just patched ext/etc/extconf.rb to add this line after the 'require 'mkmf'' at the top:
$DLDFLAGS = "#{$DLDFLAGS} -nodefaultlib:libcmt /noentry"

With the resulting binary, I can run the following ruby without problems:
require 'etc'
puts "*" * 40
puts "Login: #{Etc.getlogin}"
puts "Group: #{Etc.group}"
puts "*" * 40

...so I assume that it works.


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