Add MakeMaker PREREQ_PRINT and PRINT_PREREQ targets.

The latter is a RedHatism.

p4raw-id: //depot/perl@12833

diff --git a/lib/ExtUtils/MakeMaker.pm b/lib/ExtUtils/MakeMaker.pm
index b34fe28..a6e56b3 100644 (file)
--- a/lib/ExtUtils/MakeMaker.pm
+++ b/lib/ExtUtils/MakeMaker.pm
@@ -209,8 +209,9 @@ sub full_setup {
     PERLRUN PERLRUNINST PERL_ARCHLIB PERL_CORE
     PERL_LIB PERL_SRC PERM_RW PERM_RWX
     PL_FILES PM PM_FILTER PMLIBDIRS POLLUTE PPM_INSTALL_EXEC
-    PPM_INSTALL_SCRIPT PREFIX PREREQ_FATAL
-    PREREQ_PM SKIP TEST_LIBS TYPEMAPS VERSION VERSION_FROM XS XSOPT XSPROTOARG
+    PPM_INSTALL_SCRIPT PREFIX
+    PREREQ_FATAL PREREQ_PM PREREQ_PRINT PRINT_PREREQ
+    SKIP TEST_LIBS TYPEMAPS VERSION VERSION_FROM XS XSOPT XSPROTOARG
     XS_VERSION clean depend dist dynamic_lib linkext macro realclean
     tool_autosplit
     MACPERL_SRC MACPERL_LIB MACLIBS_68K MACLIBS_PPC MACLIBS_SC MACLIBS_MRC
@@ -327,6 +328,17 @@ sub ExtUtils::MakeMaker::new {
     my($class,$self) = @_;
     my($key);
 
+    if ("@ARGV" =~ /\bPREREQ_PRINT\b/) {
+       require Data::Dumper;
+        print Data::Dumper->Dump([$self->{PREREQ_PM}], [qw(PREREQ_PM)]);
+   }
+
+    # PRINT_PREREQ is RedHatism.
+    if ("@ARGV" =~ /\bPRINT_PREREQ\b/) {
+       print join(" ", map { "perl($_)>=$self->{PREREQ_PM}->{$_} " } sort keys %{$self->{PREREQ_PM}}), "\n";
+       exit 0;
+   }
+
     print STDOUT "MakeMaker (v$VERSION)\n" if $Verbose;
     if (-f "MANIFEST" && ! -f "Makefile"){
        check_manifest();
@@ -1802,6 +1814,23 @@ at a later time, e.g. after an unsuccessful B<make test> of your module.
 
 It is I<extremely> rare to have to use C<PREREQ_FATAL> at all!
 
+=item PREREQ_PRINT
+
+Bool.  If this parameter is true, the prerequisites will be printed to
+stdout and MakeMaker will exit.  The output format is
+
+$PREREQ_PM = {
+               'A::B' => Vers1,
+               'C::D' => Vers2,
+               ...
+             };
+
+=item PRINT_PREREQ
+
+RedHatism for C<PREREQ_PRINT>.  The output format is different, though:
+
+    perl(A::B)>=Vers1 perl(C::D)>=Vers2 ...
+
 =item SKIP
 
 Arrayref. E.g. [qw(name1 name2)] skip (do not write) sections of the