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Re: Performance issue of libtool-2.4.4

From: Bob Friesenhahn
Subject: Re: Performance issue of libtool-2.4.4
Date: Tue, 3 Feb 2015 08:31:28 -0600 (CST)
User-agent: Alpine 2.01 (GSO 1266 2009-07-14)

On Tue, 3 Feb 2015, Robert Yang wrote:

Sorry, I was wrong, tt seems that libtoolize is not the key, but libtool,
when compile cairo-1.12.18:

                libtool 2.4.2   libtool 2.4.5
configure:      31s             32s
compile:        54s             64s

The libtool 2.4.5 costs 10 more seconds. I'm debugging on it, any suggestion
is appreciated.

The build slowdown must not be my imagination then. I had attributed the slowdown to other factors. Recently I noticed that build times for my own project were significantly longer than I remember.

Previously libtool was heavily optimized to reduce the number of forks (execution of child process). This optimization should still be present in 2.4.2. Any additional forks will result in a slower build.

It is not necessary to libtoolize a package in order to test its build performance with different libtool versions. You can specify LIBTOOL in the environment (see the Makefiles) such that it points to the uninstalled libtool in a libtool build tree.

Bob Friesenhahn
GraphicsMagick Maintainer,

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