PKG-CONFIG(1) User Contributed Perl Documentation PKG-CONFIG(1)NAME
PkgConfig - Pure-Perl Core-Only replacement for pkg-config
SYNOPSIS
As a replacement for "pkg-config"
$ ppkg-config --libs --cflags --static gio-2.0
#outputs (lines artifically broken up for readability):
# -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include
# -pthread -lgio-2.0 -lz -lresolv -lgobject-2.0
# -lgmodule-2.0 -ldl -lgthread-2.0 -pthread -lrt -lglib-2.0
"pkg-config.pl" can be used as an alias for "ppkg-config" on platforms
that support it. It can also be installed as "pkg-config" though this
is not recomended if your system has a native "pkg-config".
Compare to:
$ pkg-config --libs --cflags --static gio-2.0
#outputs ( "" ):
# -pthread -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include
# -pthread -lgio-2.0 -lz -lresolv -lgobject-2.0 -lgmodule-2.0
# -ldl -lgthread-2.0 -lrt -lglib-2.0
From another Perl module
use PkgConfig;
my $o = PkgConfig->find('gio');
if($o->errmsg) {
#handle error
} else {
my $prefix = $o->get_var('prefix');
my @cflags = $o->get_cflags;
my @ldflags = $o->get_ldflags;
}
DESCRIPTION
"PkgConfig" provides a pure-perl, core-only replacement for the
"pkg-config" utility.
This is not a description of the uses of "pkg-config" but rather a
description of the differences between the C version and the Perl one.
While "pkg-config" is a compiled binary linked with glib, the pure-perl
version has no such requirement, and will run wherever Perl ( >= 5.6 )
does.
The main supported options are the common "--libs", "--cflags",
"--static", "--exists" and "--modversion".
SCRIPT OPTIONS
USAGE
<packagename1 pkgname2..> [ --options ]
ARGUMENTS
By default, a library name must be supplied unless one of --version, or
--real-version is specified.
The output should normally be suitable for passing to your favorite
compiler.
--libs
(Also) print linker flags. Dependencies are traverse in order. Top-
level dependencies will appear earlier in the command line than bottom-
level dependencies.
--libs-only-L
Prints -L/-R part of "--libs". It defines library search path but
without libraries to link with.
--libs-only-l
Prints the -l part of "--libs".
--libs-only-other
Prints the part of "--libs" not covered by "--libs-only-L" and
"--libs-only-l", such as "--pthread".
--list-all
List all know packages.
--cflags
(Also) print compiler and C preprocessor flags.
--cflags-only-I
Prints the -I part of "--cflags"
--cflags-only-other
Prints the parts of "--cflags" not covered by "--cflags-only-I".
--modversion
Print the version of a given package.
--static
Use extra dependencies and libraries if linking against a static
version of the requested library
--exists
Return success (0) if the package exists in the search path.
--with-path=PATH
Prepend "PATH" to the list of search paths containing ".pc" files.
This option can be specified multiple times with different paths, and
they will all be added.
--env-only
Using this option, only paths specified in "PKG_CONFIG_PATH" are
recognized and any hard-coded defaults are ignored.
--guess-paths
Invoke "gcc" and "ld" to determine default linker and include paths.
Default paths will be excluded from explicit -L and -I flags.
--define-variable=VARIABLE=VALUE
Define a variable, overriding any such variable definition in the .pc
file, and allowing your value to interpolate with subsequent uses.
--variable=VARIABLE
This returns the value of a variable defined in a package's .pc file.
--print-variables
Print all defined variables found in the .pc files.
--version
The target version of "pkg-config" emulated by this script
--real-version
The actual version of this script
--debug
Print debugging information
--silence-errors
Turn off errors. This is the default for non-libs/cflag/modversion
arguments
--print-errors
Print errors to STDERR and takes precedence over "--silence-errors"
--errors-to-stdout
Print errors to STDOUT and takes precedence over "--print-errors"
ENVIRONMENT
the "PKG_CONFIG_PATH" and "PKG_CONFIG_LIBDIR" variables are honored and
used as a colon-delimited (semicolon-delimited on Windows) list of
directories with contain ".pc" files.
Other environment variables recongized by both "pkg-config" and
PkgConfig include:
PKG_CONFIG_ALLOW_SYSTEM_CFLAGS
PKG_CONFIG_ALLOW_SYSTEM_LIBS
If Win32API::Registry is installed, on Windows (but not Cygwin)
PkgConfig will also consult these registry keys. The names are
ignored, but the values are paths containing ".pc" files.
HKEY_CURRENT_USER\Software\pkgconfig\PKG_CONFIG_PATH
HKEY_LOCAL_MACHINE\Software\pkgconfig\PKG_CONFIG_PATH
Registry support should be considered somewhat experimental, subject to
change in the future, though not without good reason. The rationale
for this caveat is that this feature is documented in several places,
but I have yet to find a working version that implements this feature.
MODULE OPTIONS
PkgConfig->find
my $result = PkgConfig->find($libary, %options);
Find a library and return a result object. $library can be either a
single name of a library, or a reference to an array of library names
The options are in the form of hash keys and values, and the following
are recognized:
"search_path"
"search_path_override"
Prepend search paths in addition to the paths specified in
$ENV{PKG_CONFIG_PATH} The value is an array reference.
the "_override" variant ignores defaults (like "PKG_CONFIG_PATH").
"file_path"
Specifies the full path of the of the .pc file that you wish to
load. It does not need to be in the search path (although any
dependencies will need to be). Useful if you know the full path of
the exact .pc file that you want.
"exclude_cflags"
"exclude_ldflags"
"exclude_cflags_override"
"exclude_ldflags_override"
Some ".pc" files specify default compiler and linker search paths,
e.g. "-I/usr/include -L/usr/lib". Specifying them on the command
line can be problematic as it drastically changes the search order.
The above options will either append or replace the options which
are excluded and filtered.
The default excluded linker and compiler options can be obtained
via @PkgConfig::DEFAULT_EXCLUDE_LFLAGS and
@PkgConfig::DEFAULT_EXCLUDE_CFLAGS, respectively.
"static"
Also specify static libraries.
"no_recurse"
Do not recurse dependencies. This is useful for just doing version
checks.
"VARS"
Define a hashref of variables to override any variable definitions
within the .pc files. This is equivalent to the "--define-variable"
command-line option.
A "PkgConfig" object is returned and may be queried about the results:
$o->errmsg
An error message, if any. This is a string and indicates an error.
$o->pkg_exists
Boolean value, true if the package exists.
$o->pkg_version
The version of the package
$o->get_cflags
$o->get_ldflags
Returns compiler and linker flags, respectively.
In list context, these methods return a list with each argument split
on unescaped spaces.
In list context returns a list of compiler and linker flags,
respectively.
In scalar context returns a string of compiler and linker flags with
spaces and quotes escaped correctly.
$o->get_var($name)
Get the variable with the given name.
PkgConfig->Guess
This is a class method, and will replace the hard-coded default linker
and include paths with those discovered by invoking ld(1) and cpp(1).
Currently this only works with GCC-supplied "ld" and GNU "ld".
INSTALL
The "Makefile.PL" that comes with "PkgConfig" can take one or more
"--script" options to change of the name of the script or scripts that
are installed.
--script ppkg-config
This is the default and works on all platforms
--scriptpkg-config.pl
This is installed by default on all platforms except for Windows,
where the .pl may confuse the shell and cause the script to be
opened in a text editor.
--script pkg-config
This is the default name of the real "pkg-config" and so you have
to specifically enable it if you want it.
--script none
Don't install any scripts.
Example, install all script names:
% perl Makefile.PL --script ppkg-config --scriptpkg-config.pl--script pkg-config
Example, don't install any scripts:
% perl Makefile.PL --script none
You can also set the environment variable PERL_PKG_CONFIG_SCRIPTS to
the desired --script value (separating each script name with a comma
",") to ensure that upgrades of PkgConfig do the same.
CAVEATS
On Strawberry Perl "ppkg-config" acts like Strawberry is the system.
This means that
· The .pc files that are bundled with Strawberry are searched by
default.
· The Strawberry include and lib directories are used to compute the
exclusion lists.
As of Strawberry 5.20.0.1 PkgConfig is bundled with Strawberry and
"pkg-config" is installed by default (in addition to "ppkg-config",
though the "ppkg-config" alias is NOT bundled with Strawberry itself).
For details on how to patch the .pc files bundled with older
Strawberries, see the "README.win32" that comes with this Distribution.
BUGS
The order of the flags is not exactly matching to that of "pkg-config".
From my own observation, it seems this module does a better job, but I
might be wrong.
Unlike "pkg-config", the scripts "--exists" function will return
nonzero if a package or any of its dependencies are missing. This
differs from the behavior of "pkg-config" which will just check for the
definition of the package itself (without dependencies).
SEE ALSO
pkg-config <http://www.freedesktop.org/wiki/Software/pkg-config>
The original C implementation
ExtUtils::PkgConfig
A wrapper around the "pkg-config" binary that can be used in your
"Makefile.PL" or "Build.PL".
<http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/pkg-config/>
Another perl implementation of pkg-config
pkgconf <https://github.com/pkgconf/pkgconf>
An alternative C implementation
pkg-config <https://github.com/ruby-gnome2/pkg-config>
Pure Ruby implementation.
pykg-config <https://pypi.python.org/pypi/pykg-config/1.2.0>
A Python implementation.
AUTHOR
Original Author: M. Nunberg
Current maintainer: Graham Ollis <plicease@cpan.org>
Other contributors include:
Vladimir Timofeev (vovkasm)
kmx
Sanel Zukan
Breno G. de Oliveira (garu)
COPYRIGHT AND LICENSE
Copyright (C) 2012 M. Nunberg
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
perl v5.20.2 2015-03-18 PKG-CONFIG(1)
