Re: Compiler optimization in packages and options.mk comments

[Tobias Nygren <tnn%NetBSD.org@localhost>]

On Fri, 23 May 2008 11:39:03 +0200
Christian Sturm <athaba%inode.at@localhost> wrote:

> Hi,
> 
> it's about the gmp-ecm package. It really depends  a lot on 
> optimization. The can be (de)activated via ./configure.
> 
> Currently there are two optimizations.
> One is for Opteron CPUs and the other for SSE2.
> 
> ./configure --help says that it will use SSE2 on Pentium4 per 
> default. Does this work with pkgsrc? But what happens on bulk 
> builds?
> 
> Is there something like a variable to enable this options on 
> SSE2-supporting systems or Opterons?
> 
> I haven't been able to to find out how to add comments to the 
> options. Something like:
> curl- Enable curl support.
> idea- Enable support for the IDEA cryptographic algorithm 
> (possible license+patent problems).
> ldap- Enable LDAP support.
> 
> in security/gnupg.
> 
> I couldn't find the answers in the pkgsrc documentation or by 
> looking for them in other packages. Are these things documented 
> somewhere?
> 
> Christian

We normally do this by adding an "options.mk" file to the package,
and include that from the Makefile. You should find plenty of examples.
Unless the package can determine at runtime what architecture
extensions to use, leave the options disabled and let the user decide.

-Tobias

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