FAQ

On 20.11.12 02:11, Leon Timmermans wrote:
Hi all,

As a few of you may already know, I've been working on a new
compilation and linking toolkit, called ExtUtils::Builder. It's
intended as a replacement for ExtUtils::CBuilder. ExtUtils::CBuilder
has a number of issues that I'm running into:
1) The only thing it does reliably is creating loadable-objects for
perl. On some platforms it doesn't do shared libraries or executables,
and static libraries aren't in the picture anywhere. It also insists
on linking to perl's dependencies on some platforms. This greatly
reduces the usefulness of the library.
2) It can't plan ahead, it can only perform the compiling/linking.
This is a problem if you for example want to embed it into a Makefile,
but also if you want to modify the commands before running.
3) It's very inflexible in its options. It has for example an
extra_linker_flags option, but it has a fixed position. Since linker
flags tend to be very order dependent, this means it's often the wrong
position. Likewise you can't choose it's exportation method, it always
does some platform-specific thing (either exporting all or exporting a
select set of symbols).

These issues all boil down to «it does exactly what is was designed to
do, don't expect anything more». It goes so deep that a redesign from
scratch is inevitable to me.

I'm dealing with these issues by using a radically different design in
EU:B. I'm using builder roles for the compiler and linker that allow
you to specify what you'd like them to do. The classes implementing
these roles are essentially drivers for various compilers/linkers.
These classes build action objects, that can either be executed, or
turned into a command to be run (e.g. [qw/cc -o foo.o -c foo.c
-Iheaders/]). There's a separate class that inspects perl's
configuration uses that to instantiate the known compiler/linker with
the right options, but the rest of the framework can be used
independently.

It's currently in a fairly early state (and rather lacking
documentation); it's known to work on Linux, HP-UX and OS X but it is
still being ported to other platforms (there is some code for Windows
already). I can very much use some platform specialists for help
there.

Patches and comments are very welcome. The code is at
https://github.com/Leont/extutils-builder
This is really cool stuff for the thing it's designed for. I'm pretty
sure, it will satisfy a hugh amount of developers.

Thanks, Leon
--
Jens Rehsack

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postedNov 20, '12 at 1:11a
activeNov 21, '12 at 11:21a
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