| ExtUtils::MakeMaker::FAQ(3perl) | Perl Programmers Reference Guide | ExtUtils::MakeMaker::FAQ(3perl) |
ExtUtils::MakeMaker::FAQ - Frequently Asked Questions About MakeMaker
FAQs, tricks and tips for ExtUtils::MakeMaker.
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";
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.
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.
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.
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'}
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.
# 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.
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).
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.
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.
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.
To shut off its generation, pass the "NO_META" flag to "WriteMakefile()".
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 $path;
},
no_chdir => 1
},
"."
);
To avoid this, you can force the Makefile to be rebuilt whenever you change the module containing the version number by adding this to your WriteMakefile() arguments.
depend => { '$(FIRST_MAKEFILE)' => '$(VERSION_FROM)' }
Er, that's it.
use ExtUtils::MakeMaker;
WriteMakefile(
NAME => 'Cool::Foo',
VERSION_FROM => 'Foo.pm',
OBJECT => q/$(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;
BEGIN { plan 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.
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.
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.
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.
If you have a question you'd like to see added to the FAQ (whether or not you have the answer) please either:
The denizens of makemaker@perl.org.
ExtUtils::MakeMaker
| 2023-11-25 | perl v5.32.1 |