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Build.PL  view on Meta::CPAN

use strict;
use warnings;

##############################
# Microsoft is not the only group with a broken system.  Some Linuxen
# (e.g. F***ing Fedora) break the FFTW3 configure script by putting
# stuff in /usr/lib64 instead of /usr/lib or somewhere else sane.
# Similarly, the install script for FFTW3 *only* puts .pc files in
# a directory called "pkgconfig" in the same place it is putting the 
# libraries themselves.  That prevents us from specifying that it 
# put them in, say, /usr/share/pkgconfig or someplace sane like that.
#
# Since we don't want multiple .pc files floating around, the most
# straightforward way out of the dilemma is to force the libraries to be
# installed in a lib path (if available) that is in the pkg-config 
# default path.
# 
# Also, we need to ensure we stick the .pc files for this installation
# into a place where pkg-config looks by defauls, so that it will find
# them.  So try some heuristics here.

my $first_lib64 = "";
my $first_lib = "";
my $first_share_pc = "";
my $bonus_install_command = "";
my $dest_libdir = "";
my $prefix = "";

if (my $s = `pkg-config --variable pc_path pkg-config`) {
  chomp($s);
  my @pkg_config_dirs = split /\:/,$s;
  
  for my $d(@pkg_config_dirs) {
      $first_lib64    = $d if( !$first_lib64    and  $d=~ s:(.*\/lib64)\/pkgconfig$:$1: );
      $first_lib      = $d if( !$first_lib      and  $d=~ s:(.*\/lib)\/pkgconfig$:$1: );
      $first_share_pc = $d if( !$first_share_pc and  $d=~ m:.*\/share\/pkgconfig$: );
  }
  
  $dest_libdir = $first_lib || $first_lib64 || "";
  $prefix = "%s";
  
  if($dest_libdir) {
      my $s = $dest_libdir;
      if( $s =~ s:(.*)\/[^\/]+:$1: ) {  # lop off the final directory (lib part)
  	$prefix = $s;
      }
  } else {
      if($first_share_pc) {
  	$bonus_install_command = "mv %s/lib/pkgconfig/fftw*.pc $first_share_pc";
      } else {
  	die "Couldn't figure out a reasonable place to stick the pkg-config files for fftw.\n  Sorry, you're on your own.";
      }
  }
}  

my $alien_install_commands = [];
my $alien_build_commands = [];

unless(`pkg-config --libs fftw3`) {
    die "fftw3 library not found and I am not able to build it on MS Windows" if $^O eq 'MSWin32';

    print <<"FOO";
Alien::FFTW3: fftw3 library not found.  On "Build", I will fetch and build
the fftw3 library.  on "Build install" I will install it into the '$prefix' tree 
The libraries will get placed in '$dest_libdir'. 

FOO

# build commands use POSIX nomenclature.  That's ok, FFTW doesn't support losedows anyway.
$alien_build_commands = [
    "echo preparing build directories for two fftw libraries: double and float...",
    "rm -rf .fftw-double-build .fftw-float-build",
    "mkdir .fftw-double-build",
    "cp -r -p * .fftw-double-build",
    "mkdir .fftw-float-build",
    "cp -r -p * .fftw-float-build",
    "echo building double library...",
    "echo 'cd .fftw-double-build\; ./configure CFLAGS=-fPIC --prefix=$prefix ".($dest_libdir?"--libdir=$dest_libdir":"")."\; make'|sh",
    "echo building float library...",