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Alien-ZMQ-0.04
River stage zero No dependents
++
/ Alien::ZMQ

NAME

Alien::ZMQ - detect and/or install zeromq

VERSION

version 0.04

SYNOPSIS

    use Alien::ZMQ;
    use version;
    
    my $version = version->parse(Alien::ZMQ::lib_version);
    my $lib_dir = Alien::ZMQ::lib_dir;
    
    print "zeromq $version is installed at $lib_dir\n";

DESCRIPTION

Upon installation, the target system is probed for the presence of libzmq. If it is not found, libzmq 3.2.2 is installed in a shared directory. In short, modules that need libzmq can depend on this module to make sure that it is available.

This module is still EXPERIMENTAL. In particular, I'm still pondering on how libzmq-2.x should be handled. Currently, if libzmq-2.x is found on the system, Alien::ZMQ will use it, but there is no way to install libzmq-2.x with Alien::ZMQ. I'm not sure what the most useful behavior with regards to libzmq-2.x is, so please talk to me if you have any ideas.

METHODS

inc_version

Get the version number of libzmq as a v-string (version string), according to the zmq.h header file.

lib_version

Get the version number of libzmq as a v-string (version string), according to the libzmq.so file.

inc_dir

Get the directory containing the zmq.h header file.

lib_dir

Get the directory containing the libzmq.so file.

cflags

Get the C compiler flags required to compile a program that uses libzmq. This is a shortcut for constructing a -I flag using "inc_dir".

libs

Get the linker flags required to link a program against libzmq. This is a shortcut for constructing a -L flag using "lib_dir", plus -lzmq. On some platforms, you may also want to add the library path to your executable or library as a runtime path; this can be done by passing -rpath to the linker. Something like this could work:

    my $mylibs = Alien::ZMQ::libs . " -Wl,-rpath=" . Alien::ZMQ::lib_dir;

This will allow your program to find libzmq, even if it is installed in a non-standard location, but this isn't necessary on some platforms.

OPTIONS

These options to Build.PL affect the installation of this module.

--zmq-skip-probe

By default, libzmq is not compiled and installed if it is detected to already be on the system. Use this to skip those checks and always install libzmq.

--zmq-cflags=FLAGS

Pass extra flags to the compiler when probing for an existing installation of libzmq. You can use this, along with "--zmq-libs", to help the probing function locate your libzmq installation if it is installed in an unexpected place. For example, if your libzmq is installed at /opt/zeromq, you can do something like this:

    perl ./Build.PL --zmq-cflags="-I/opt/zeromq/include" \
                    --zmq-libs="-L/opt/zeromq/lib -lzmq"

These flags are only used by the probing function to locate libzmq; they will not be used when compiling libzmq from source (if it needs to be). To affect the compiling of libzmq, using the "--zmq-config" flag instead.

A better alternative to using "--zmq-cflags" and "--zmq-libs" is to help the pkg-config(1) command find your libzmq using the PKG_CONFIG_PATH environment variable. Of course, this method requires that you have the pkg-config(1) program installed. Here's an example:

    perl Build.PL
    PKG_CONFIG_PATH=/opt/zeromq/lib/pkgconfig ./Build
--zmq-libs=FLAGS

Pass extra flags to the linker when probing for an existing installation of libzmq. You can use this, along with "--zmq-cflags", to help the probing function locate your libzmq installation if it is installed in an unexpected place. Like "--zmq-cflags", these flags are only used by the probing function to locate libzmq.

--zmq-config=FLAGS

Pass extra flags to the libzmq configure script. You may want to consider passing either --with-pgm or --with-system-pgm if you need support for PGM; this is not enabled by default because it is not supported by every system.

CAVEATS

Probing is only done during the installation of this module, so if you are using a system-installed version of libzmq and you uninstall or upgrade it, you will also need to reinstall Alien::ZMQ.

BUGS

Windows is not yet supported. Patches are welcome.

SEE ALSO

ACKNOWLEDGEMENTS

The design and implementation of this module were influenced by other Alien modules, including Alien::GMP and Alien::Tidyp.

AUTHOR

Charles McGarvey <ccm@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2013 by Charles McGarvey.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.