Make installman work with -Duserelocatableinc and DESTDIR

p4raw-id: //depot/perl@32212

diff --git a/installman b/installman
index d27271e..8f6bd80 100755 (executable)
--- a/installman
+++ b/installman
@@ -1,6 +1,32 @@
 #!./perl -w
 BEGIN { @INC = qw(lib) }
 use strict;
+
+BEGIN {
+    use Config;
+    if ($Config{userelocatableinc}) {
+       # This might be a considered a hack. Need to get information about the
+       # configuration from Config.pm *before* Config.pm expands any .../
+       # prefixes.
+       #
+       # So we set $^X to pretend that we're the already installed perl, so
+       # Config.pm doesits ... expansion off that location.
+
+       my $location = $Config{initialinstalllocation};
+       die <<'OS' unless defined $location;
+$Config{initialinstalllocation} is not defined - can't install a relocatable
+perl without this.
+OS
+       $^X = "$location/perl";
+       # And then remove all trace of ever having loaded Config.pm, so that
+       # it will reload with the revised $^X
+       undef %Config::;
+       delete $INC{"Config.pm"};
+       delete $INC{"Config_heavy.pl"};
+       # You never saw us. We weren't here.
+    }
+}
+
 use Config;
 use Getopt::Long;
 use File::Find;