Somewhat less shaky relocatable @INC support. You can install things

to the current location of the perl tree, move it, install more things,
move it again, lather rinse repeat.
Configure with -Duserelocatableinc

p4raw-id: //depot/perl@27491

3 files changed, 61 insertions, 3 deletions

diff --git a/Configure b/Configure
index 56a05f9279..374eb392b3 100755
--- a/Configure
+++ b/Configure
@@ -1161,6 +1161,7 @@ nm_so_opt=''
 runnm=''
 usenm=''
 useperlio=''
+initialinstalllocation=''
 userelocatableinc=''
 usesocks=''
 d_oldpthreads=''
@@ -6031,8 +6032,12 @@ eval $setvar
 
 : Default prefix is now "up one level from where the binaries are"
 case "$userelocatableinc" in
-$define|true|[yY]*) prefix=".../.."
-		    prefixexp=".../..";;
+$define|true|[yY]*) initialinstalllocation="$binexp"
+		    bin=".../"
+		    binexp=".../"
+		    prefix=".../.."
+		    prefixexp=".../.."
+		    installprefixexp=".../..";;
 esac
 
 
@@ -22063,6 +22068,7 @@ useopcode='$useopcode'
 useperlio='$useperlio'
 useposix='$useposix'
 usereentrant='$usereentrant'
+initialinstalllocation="$initialinstalllocation"
 userelocatableinc='$userelocatableinc'
 usesfio='$usesfio'
 useshrplib='$useshrplib'
diff --git a/configpm b/configpm
index de4a69445c..1bd2e38630 100755
--- a/configpm
+++ b/configpm
@@ -326,7 +326,34 @@ if (fetch_string({},'userelocatableinc')) {
 
 			 siteprefixexp
 			 sitelib_stem
-			 vendorlib_stem)) {
+			 vendorlib_stem
+
+			 installarchlib
+			 installhtml1dir
+			 installhtml3dir
+			 installman1dir
+			 installman3dir
+			 installprefix
+			 installprefixexp
+			 installprivlib
+			 installscript
+			 installsitearch
+			 installsitebin
+			 installsitehtml1dir
+			 installsitehtml3dir
+			 installsitelib
+			 installsiteman1dir
+			 installsiteman3dir
+			 installsitescript
+			 installvendorarch
+			 installvendorbin
+			 installvendorhtml1dir
+			 installvendorhtml3dir
+			 installvendorlib
+			 installvendorman1dir
+			 installvendorman3dir
+			 installvendorscript
+			 )) {
 	push @need_relocation, $what if fetch_string({}, $what) =~ m!^\.\.\./!;
     }
 }
diff --git a/installperl b/installperl
index 2f59f4563a..919fc648bd 100755
--- a/installperl
+++ b/installperl
@@ -7,6 +7,31 @@ BEGIN {
     $ENV{PERL5LIB} = 'lib';
 }
 
+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 $INC{"Config_heavy.pl"};
+	# You never saw us. We weren't here.
+    }
+}
+
 use strict;
 my ($Is_VMS, $Is_W32, $Is_OS2, $Is_Cygwin, $Is_Darwin,
     $nonono, $dostrip, $versiononly, $silent, $verbose, $force,