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Re: GCC 4.1: Buildable on GHz machines only?

From: David Daney <ddaney at avtrex dot com>
To: Per Bothner <per at bothner dot com>
Cc: gcc at gcc dot gnu dot org, GCJ <java at gcc dot gnu dot org>
Date: Wed, 04 May 2005 18:09:54 -0700
Subject: Re: GCC 4.1: Buildable on GHz machines only?
References: <426EFE00.3060903@3am-software.com> <20050427025707.GA20956@nevyn.them.org> <20050427053042.GA1317@redhat.com> <426F2611.7060801@3am-software.com> <426FD0DC.50601@codesourcery.com> <427962FC.5000305@bothner.com>

Per Bothner wrote:


One way to speed up libcgj compilation by quite a bit would be to
compile more than one .java file at a time.  For example:
  gcj -c java/util/*.java -o java-util.o
This reduces libtool overhead, reduces the duplication in reading
dependencies, and probably reduces link overheads.  It can also
produce better code, since intermodule references get trurned into
intramodule references.  This just requires Makefile-hacking.

I was going to recommend the same thing.

We have taken this approach with a fairly large program (about 1000 classes) and it does speed things up considerably. We see a 75% reduction in total build times (12 minutes vs 48).

David Daney

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