ExtUti...r::FAQ(3perl) Perl Programmers Reference Guide ExtUti...r::FAQ(3perl)
NAME
ExtUtils::MakeMaker::FAQ - Frequently Asked Questions About MakeMaker
DESCRIPTION
FAQs, tricks and tips for ExtUtils::MakeMaker.
Module Installation
How do I install a module into my home directory?
If you're not the Perl administrator you probably don't have
permission to install a module to its default location. Ways of
handling this with a lot less manual effort on your part are
perlbrew and local::lib.
Otherwise, you can install it for your own use into your home
directory like so:
# Non-unix folks, replace ~ with /path/to/your/home/dir
perl Makefile.PL INSTALL_BASE=~
This will put modules into ~/lib/perl5, man pages into ~/man and
programs into ~/bin.
To ensure your Perl programs can see these newly installed modules,
set your "PERL5LIB" environment variable to ~/lib/perl5 or tell each
of your programs to look in that directory with the following:
use lib "$ENV{HOME}/lib/perl5";
or if $ENV{HOME} isn't set and you don't want to set it for some
reason, do it the long way.
use lib "/path/to/your/home/dir/lib/perl5";
How do I get MakeMaker and Module::Build to install to the same place?
Module::Build, as of 0.28, supports two ways to install to the same
location as MakeMaker.
We highly recommend the install_base method, its the simplest and
most closely approximates the expected behavior of an installation
prefix.
1) Use INSTALL_BASE / "--install_base"
MakeMaker (as of 6.31) and Module::Build (as of 0.28) both can
install to the same locations using the "install_base" concept. See
"INSTALL_BASE" in ExtUtils::MakeMaker for details. To get MM and MB
to install to the same location simply set INSTALL_BASE in MM and
"--install_base" in MB to the same location.
perl Makefile.PL INSTALL_BASE=/whatever
perl Build.PL --install_base /whatever
This works most like other language's behavior when you specify a
prefix. We recommend this method.
2) Use PREFIX / "--prefix"
Module::Build 0.28 added support for "--prefix" which works like
MakeMaker's PREFIX.
perl Makefile.PL PREFIX=/whatever
perl Build.PL --prefix /whatever
We highly discourage this method. It should only be used if you
know what you're doing and specifically need the PREFIX behavior.
The PREFIX algorithm is complicated and focused on matching the
system installation.
How do I keep from installing man pages?
Recent versions of MakeMaker will only install man pages on Unix-
like operating systems by default. To generate manpages on non-Unix
operating systems, make the "manifypods" target.
For an individual module:
perl Makefile.PL INSTALLMAN1DIR=none INSTALLMAN3DIR=none
If you want to suppress man page installation for all modules you
have to reconfigure Perl and tell it 'none' when it asks where to
install man pages.
How do I use a module without installing it?
Two ways. One is to build the module normally...
perl Makefile.PL
make
make test
...and then use blib to point Perl at the built but uninstalled
module:
perl -Mblib script.pl
perl -Mblib -e '...'
The other is to install the module in a temporary location.
perl Makefile.PL INSTALL_BASE=~/tmp
make
make test
make install
And then set PERL5LIB to ~/tmp/lib/perl5. This works well when you
have multiple modules to work with. It also ensures that the module
goes through its full installation process which may modify it.
Again, local::lib may assist you here.
How can I organize tests into subdirectories and have them run?
Let's take the following test directory structure:
t/foo/sometest.t
t/bar/othertest.t
t/bar/baz/anothertest.t
Now, inside of the WriteMakefile() function in your Makefile.PL,
specify where your tests are located with the "test" directive:
test => {TESTS => 't/*.t t/*/*.t t/*/*/*.t'}
The first entry in the string will run all tests in the top-level t/
directory. The second will run all test files located in any
subdirectory under t/. The third, runs all test files within any
subdirectory within any other subdirectory located under t/.
Note that you do not have to use wildcards. You can specify
explicitly which subdirectories to run tests in:
test => {TESTS => 't/*.t t/foo/*.t t/bar/baz/*.t'}
PREFIX vs INSTALL_BASE from Module::Build::Cookbook
The behavior of PREFIX is complicated and depends closely on how
your Perl is configured. The resulting installation locations will
vary from machine to machine and even different installations of
Perl on the same machine. Because of this, its difficult to
document where prefix will place your modules.
In contrast, INSTALL_BASE has predictable, easy to explain
installation locations. Now that Module::Build and MakeMaker both
have INSTALL_BASE there is little reason to use PREFIX other than to
preserve your existing installation locations. If you are starting a
fresh Perl installation we encourage you to use INSTALL_BASE. If you
have an existing installation installed via PREFIX, consider moving
it to an installation structure matching INSTALL_BASE and using that
instead.
Generating *.pm files with substitutions eg of $VERSION
If you want to configure your module files for local conditions, or
to automatically insert a version number, you can use EUMM's
"PL_FILES" capability, where it will automatically run each *.PL it
finds to generate its basename. For instance:
# Makefile.PL:
require 'common.pl';
my $version = get_version();
my @pms = qw(Foo.pm);
WriteMakefile(
NAME => 'Foo',
VERSION => $version,
PM => { map { ($_ => "\$(INST_LIB)/$_") } @pms },
clean => { FILES => join ' ', @pms },
);
# common.pl:
sub get_version { '0.04' }
sub process { my $v = get_version(); s/__VERSION__/$v/g; }
1;
# Foo.pm.PL:
require 'common.pl';
$_ = join '', <DATA>;
process();
my $file = shift;
open my $fh, '>', $file or die "$file: $!";
print $fh $_;
__DATA__
package Foo;
our $VERSION = '__VERSION__';
1;
You may notice that "PL_FILES" is not specified above, since the
default of mapping each .PL file to its basename works well.
If the generated module were architecture-specific, you could
replace "$(INST_LIB)" above with "$(INST_ARCHLIB)", although if you
locate modules under lib, that would involve ensuring any "lib/" in
front of the module location were removed.
Common errors and problems
"No rule to make target `/usr/lib/perl5/CORE/config.h', needed by
`Makefile'"
Just what it says, you're missing that file. MakeMaker uses it to
determine if perl has been rebuilt since the Makefile was made.
It's a bit of a bug that it halts installation.
Some operating systems don't ship the CORE directory with their base
perl install. To solve the problem, you likely need to install a
perl development package such as perl-devel (CentOS, Fedora and
other Redhat systems) or perl (Ubuntu and other Debian systems).
Philosophy and History
Why not just use <insert other build config tool here>?
Why did MakeMaker reinvent the build configuration wheel? Why not
just use autoconf or automake or ppm or Ant or ...
There are many reasons, but the major one is cross-platform
compatibility.
Perl is one of the most ported pieces of software ever. It works on
operating systems I've never even heard of (see perlport for
details). It needs a build tool that can work on all those
platforms and with any wacky C compilers and linkers they might
have.
No such build tool exists. Even make itself has wildly different
dialects. So we have to build our own.
What is Module::Build and how does it relate to MakeMaker?
Module::Build is a project by Ken Williams to supplant MakeMaker.
Its primary advantages are:
• pure perl. no make, no shell commands
• easier to customize
• cleaner internals
• less cruft
Module::Build was long the official heir apparent to MakeMaker. The
rate of both its development and adoption has slowed in recent
years, though, and it is unclear what the future holds for it. That
said, Module::Build set the stage for something to become the heir
to MakeMaker. MakeMaker's maintainers have long said that it is a
dead end and should be kept functioning, while being cautious about
extending with new features.
Module Writing
How do I keep my $VERSION up to date without resetting it manually?
Often you want to manually set the $VERSION in the main module
distribution because this is the version that everybody sees on CPAN
and maybe you want to customize it a bit. But for all the other
modules in your dist, $VERSION is really just bookkeeping and all
that's important is it goes up every time the module is changed.
Doing this by hand is a pain and you often forget.
Probably the easiest way to do this is using perl-reversion in
Perl::Version:
perl-reversion -bump
If your version control system supports revision numbers (git
doesn't easily), the simplest way to do it automatically is to use
its revision number (you are using version control, right?).
In CVS, RCS and SVN you use $Revision$ (see the documentation of
your version control system for details). Every time the file is
checked in the $Revision$ will be updated, updating your $VERSION.
SVN uses a simple integer for $Revision$ so you can adapt it for
your $VERSION like so:
($VERSION) = q$Revision$ =~ /(\d+)/;
In CVS and RCS version 1.9 is followed by 1.10. Since CPAN compares
version numbers numerically we use a sprintf() to convert 1.9 to
1.009 and 1.10 to 1.010 which compare properly.
$VERSION = sprintf "%d.%03d", q$Revision$ =~ /(\d+)\.(\d+)/g;
If branches are involved (ie. $Revision: 1.5.3.4$) it's a little
more complicated.
# must be all on one line or MakeMaker will get confused.
$VERSION = do { my @r = (q$Revision$ =~ /\d+/g); sprintf "%d."."%03d" x $#r, @r };
In SVN, $Revision$ should be the same for every file in the project
so they would all have the same $VERSION. CVS and RCS have a
different $Revision$ per file so each file will have a different
$VERSION. Distributed version control systems, such as SVK, may
have a different $Revision$ based on who checks out the file,
leading to a different $VERSION on each machine! Finally, some
distributed version control systems, such as darcs, have no concept
of revision number at all.
What's this META.yml thing and how did it get in my MANIFEST?!
META.yml is a module meta-data file pioneered by Module::Build and
automatically generated as part of the 'distdir' target (and thus
'dist'). See "Module Meta-Data" in ExtUtils::MakeMaker.
To shut off its generation, pass the "NO_META" flag to
WriteMakefile().
How do I delete everything not in my MANIFEST?
Some folks are surprised that "make distclean" does not delete
everything not listed in their MANIFEST (thus making a clean
distribution) but only tells them what they need to delete. This is
done because it is considered too dangerous. While developing your
module you might write a new file, not add it to the MANIFEST, then
run a "distclean" and be sad because your new work was deleted.
If you really want to do this, you can use
ExtUtils::Manifest::manifind() to read the MANIFEST and File::Find
to delete the files. But you have to be careful. Here's a script
to do that. Use at your own risk. Have fun blowing holes in your
foot.
#!/usr/bin/perl -w
use strict;
use File::Spec;
use File::Find;
use ExtUtils::Manifest qw(maniread);
my %manifest = map {( $_ => 1 )}
grep { File::Spec->canonpath($_) }
keys %{ maniread() };
if( !keys %manifest ) {
print "No files found in MANIFEST. Stopping.\n";
exit;
}
find({
wanted => sub {
my $path = File::Spec->canonpath($_);
return unless -f $path;
return if exists $manifest{ $path };
print "unlink $path\n";
unlink $path;
},
no_chdir => 1
},
"."
);
Which tar should I use on Windows?
We recommend ptar from Archive::Tar not older than 1.66 with '-C'
option.
Which zip should I use on Windows for '[ndg]make zipdist'?
We recommend InfoZIP: <http://www.info-zip.org/Zip.html>
XS
How do I prevent "object version X.XX does not match bootstrap parameter
Y.YY" errors?
XS code is very sensitive to the module version number and will
complain if the version number in your Perl module doesn't match.
If you change your module's version # without rerunning Makefile.PL
the old version number will remain in the Makefile, causing the XS
code to be built with the wrong number.
To avoid this, you can force the Makefile to be rebuilt whenever you
change the module containing the version number by adding this to
your WriteMakefile() arguments.
depend => { '$(FIRST_MAKEFILE)' => '$(VERSION_FROM)' }
How do I make two or more XS files coexist in the same directory?
Sometimes you need to have two and more XS files in the same
package. There are three ways: "XSMULTI", separate directories, and
bootstrapping one XS from another.
XSMULTI Structure your modules so they are all located under lib,
such that "Foo::Bar" is in lib/Foo/Bar.pm and
lib/Foo/Bar.xs, etc. Have your top-level "WriteMakefile" set
the variable "XSMULTI" to a true value.
Er, that's it.
Separate directories
Put each XS files into separate directories, each with their
own Makefile.PL. Make sure each of those Makefile.PLs has
the correct "CFLAGS", "INC", "LIBS" etc. You will need to
make sure the top-level Makefile.PL refers to each of these
using "DIR".
Bootstrapping
Let's assume that we have a package "Cool::Foo", which
includes "Cool::Foo" and "Cool::Bar" modules each having a
separate XS file. First we use the following Makefile.PL:
use ExtUtils::MakeMaker;
WriteMakefile(
NAME => 'Cool::Foo',
VERSION_FROM => 'Foo.pm',
OBJECT => q/$(O_FILES)/,
# ... other attrs ...
);
Notice the "OBJECT" attribute. MakeMaker generates the
following variables in Makefile:
# Handy lists of source code files:
XS_FILES= Bar.xs \
Foo.xs
C_FILES = Bar.c \
Foo.c
O_FILES = Bar.o \
Foo.o
Therefore we can use the "O_FILES" variable to tell
MakeMaker to use these objects into the shared library.
That's pretty much it. Now write Foo.pm and Foo.xs, Bar.pm
and Bar.xs, where Foo.pm bootstraps the shared library and
Bar.pm simply loading Foo.pm.
The only issue left is to how to bootstrap Bar.xs. This is
done from Foo.xs:
MODULE = Cool::Foo PACKAGE = Cool::Foo
BOOT:
# boot the second XS file
boot_Cool__Bar(aTHX_ cv);
If you have more than two files, this is the place where you
should boot extra XS files from.
The following four files sum up all the details discussed so
far.
Foo.pm:
-------
package Cool::Foo;
require DynaLoader;
our @ISA = qw(DynaLoader);
our $VERSION = '0.01';
bootstrap Cool::Foo $VERSION;
1;
Bar.pm:
-------
package Cool::Bar;
use Cool::Foo; # bootstraps Bar.xs
1;
Foo.xs:
-------
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
MODULE = Cool::Foo PACKAGE = Cool::Foo
BOOT:
# boot the second XS file
boot_Cool__Bar(aTHX_ cv);
MODULE = Cool::Foo PACKAGE = Cool::Foo PREFIX = cool_foo_
void
cool_foo_perl_rules()
CODE:
fprintf(stderr, "Cool::Foo says: Perl Rules\n");
Bar.xs:
-------
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
MODULE = Cool::Bar PACKAGE = Cool::Bar PREFIX = cool_bar_
void
cool_bar_perl_rules()
CODE:
fprintf(stderr, "Cool::Bar says: Perl Rules\n");
And of course a very basic test:
t/cool.t:
--------
use Test::More tests => 1;
use Cool::Foo;
use Cool::Bar;
Cool::Foo::perl_rules();
Cool::Bar::perl_rules();
ok 1;
This tip has been brought to you by Nick Ing-Simmons and
Stas Bekman.
An alternative way to achieve this can be seen in
Gtk2::CodeGen and Glib::CodeGen.
DESIGN
MakeMaker object hierarchy (simplified)
What most people need to know (superclasses on top.)
ExtUtils::MM_Any
|
ExtUtils::MM_Unix
|
ExtUtils::MM_{Current OS}
|
ExtUtils::MakeMaker
|
MY
The object actually used is of the class MY which allows you to override
bits of MakeMaker inside your Makefile.PL by declaring MY::foo()
methods.
MakeMaker object hierarchy (real)
Here's how it really works:
ExtUtils::MM_Any
|
ExtUtils::MM_Unix
|
ExtUtils::Liblist::Kid ExtUtils::MM_{Current OS} (if necessary)
| |
ExtUtils::Liblist ExtUtils::MakeMaker |
| | |
| | |-----------------------
ExtUtils::MM
| |
ExtUtils::MY MM (created by ExtUtils::MM)
| |
MY (created by ExtUtils::MY) |
. |
(mixin) |
. |
PACK### (created each call to ExtUtils::MakeMaker->new)
NOTE: Yes, this is a mess. See
<http://archive.develooper.com/makemaker@perl.org/msg00134.html> for
some history.
NOTE: When ExtUtils::MM is loaded it chooses a superclass for MM from
amongst the ExtUtils::MM_* modules based on the current operating
system.
NOTE: ExtUtils::MM_{Current OS} represents one of the ExtUtils::MM_*
modules except ExtUtils::MM_Any chosen based on your operating system.
NOTE: The main object used by MakeMaker is a PACK### object, *not*
ExtUtils::MakeMaker. It is, effectively, a subclass of MY,
ExtUtils::MakeMaker, ExtUtils::Liblist and ExtUtils::MM_{Current OS}
NOTE: The methods in MY are simply copied into PACK### rather than MY
being a superclass of PACK###. I don't remember the rationale.
NOTE: ExtUtils::Liblist should be removed from the inheritance hiearchy
and simply be called as functions.
NOTE: Modules like File::Spec and Exporter have been omitted for
clarity.
The MM_* hierarchy
MM_Win95 MM_NW5
\ /
MM_BeOS MM_Cygwin MM_OS2 MM_VMS MM_Win32 MM_DOS MM_UWIN
\ | | | / / /
------------------------------------------------
| |
MM_Unix |
| |
MM_Any
NOTE: Each direct MM_Unix subclass is also an MM_Any subclass. This is
a temporary hack because MM_Unix overrides some MM_Any methods with Unix
specific code. It allows the non-Unix modules to see the original
MM_Any implementations.
NOTE: Modules like File::Spec and Exporter have been omitted for
clarity.
PATCHING
If you have a question you'd like to see added to the FAQ (whether or
not you have the answer) please either:
• make a pull request on the MakeMaker github repository
• raise a issue on the MakeMaker github repository
• file an RT ticket
• email makemaker@perl.org
AUTHOR
The denizens of makemaker@perl.org.
SEE ALSO
ExtUtils::MakeMaker
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