From: Andrew Walrond <andrew@...>
Date: 2009-02-11T02:35:13+09:00
Subject: [ruby-core:21958] ruby 1.9.1 parallel make race

Hello list,

Nice work on 1.9.; I've just starting porting my stuff across and like 
it very much.

I've noticed intermittent build failures when doing a parallel make 
(make -j4) of 1.9.1.
It looks like a race between creating a directory and copying files into it:

    mkdir -p ../../.ext/common/openssl
    cp ../.././ext/openssl/lib/openssl/cipher.rb ../../.ext/common/openssl
    mkdir: cannot create directory `../../.ext/common/openssl': File exists
    make[1]: *** [../../.ext/common/openssl] Error 1

Looking at the build log, I see other places where the same thing might 
happen. See here

    mkdir -p ../../.ext/include/ruby
    mkdir -p ../../.ext/common/digest
    cp ../.././ext/digest/lib/digest/hmac.rb ../../.ext/common/digest
    cp ../.././ext/digest/lib/digest.rb ../../.ext/common
    cp ../.././ext/digest/digest.h ../../.ext/include/ruby

and here

    mkdir -p ../../.ext/common/dl
    cp ../.././ext/dl/lib/dl/cparser.rb ../../.ext/common/dl

And here is another failure which happened as I was typing:

    mkdir -p ../../.ext/common/ripper
    cp ../.././ext/ripper/lib/ripper/core.rb ../../.ext/common/ripper
    mkdir: cannot create directory `../../.ext/common/ripper': File exists

I guess this will be easy enough to fix, if it hasn't been already. I 
could get setup with the latest source repo and attempt a patch if it 
would be useful; Let me know.

Andrew Walrond