perlPackages: Add cross-compilation support.

This involved:

* Installing miniperl as $dev/bin/perl
* Setting miniperl to take INC from
  lib/perl5/{site_perl/,}cross_perl/${version} as well as
  lib/perl5/{site_perl/,}/${version}/${runtimeArch}, in that
  order. miniperl taking from runtimeArch is not really correct, but
  it works in some pure-perl cases (e.g. Config.pm) and can be
  overridden with the cross_perl variant.
* Installing perl-cross's stubs into
  $dev/lib/perl5/cross_perl/${version}
* Patching MakeMaker.pm to gracefully degrade (very slightly) if B.pm
  can't be loaded, which it can't in cross-compilation.
* Passing the right build-time and runtime perls to Makefile.PL

2 files changed, 4 insertions, 3 deletions

diff --git a/pkgs/development/perl-modules/generic/builder.sh b/pkgs/development/perl-modules/generic/builder.sh
index 1b8888dd3ceb0..937dad971b87d 100644
--- a/pkgs/development/perl-modules/generic/builder.sh
+++ b/pkgs/development/perl-modules/generic/builder.sh
@@ -22,7 +22,7 @@ preConfigure() {
         fi
     done
 
-    perl Makefile.PL PREFIX=$out INSTALLDIRS=site $makeMakerFlags
+    perl Makefile.PL PREFIX=$out INSTALLDIRS=site $makeMakerFlags PERL=$(type -P perl) FULLPERL=$perl/bin/perl
 }
 
 
diff --git a/pkgs/development/perl-modules/generic/default.nix b/pkgs/development/perl-modules/generic/default.nix
index 9e21a141c728d..b33861d83eed1 100644
--- a/pkgs/development/perl-modules/generic/default.nix
+++ b/pkgs/development/perl-modules/generic/default.nix
@@ -1,6 +1,6 @@
 perl:
 
-{ buildInputs ? [], name, ... } @ attrs:
+{ nativeBuildInputs ? [], name, ... } @ attrs:
 
 perl.stdenv.mkDerivation (
   {
@@ -27,6 +27,7 @@ perl.stdenv.mkDerivation (
   {
     name = "perl-" + name;
     builder = ./builder.sh;
-    buildInputs = buildInputs ++ [ perl ];
+    nativeBuildInputs = nativeBuildInputs ++ [ (perl.dev or perl) ];
+    inherit perl;
   }
 )