From 7a8675bc7c355f062650f283996d25b47996007d Mon Sep 17 00:00:00 2001
From: Jarkko Hietaniemi <jhi@iki.fi>
Date: Thu, 17 Apr 2003 17:09:16 +0000
Subject: Implement -Dnoextensions=... and -Donlyextensions=...

p4raw-id: //depot/perl@19253
---
 Configure | 42 +++++++++++++++++++++++++++++++++++++++++-
 INSTALL   | 16 ++++++++++++++--
 2 files changed, 55 insertions(+), 3 deletions(-)

diff --git a/Configure b/Configure
index 14bba08a6a..5099566284 100755
--- a/Configure
+++ b/Configure
@@ -20,7 +20,7 @@
 
 # $Id: Head.U,v 3.0.1.9 1997/02/28 15:02:09 ram Exp $
 #
-# Generated on Thu Apr 17 18:50:57 EET DST 2003 [metaconfig 3.0 PL70]
+# Generated on Thu Apr 17 20:57:08 EET DST 2003 [metaconfig 3.0 PL70]
 # (with additional metaconfig patches by perlbug@perl.org)
 
 cat >c1$$ <<EOF
@@ -20200,6 +20200,46 @@ set X $dynamic_ext $static_ext $nonxs_ext
 shift
 extensions="$*"
 
+case "$onlyextensions" in
+'') ;;
+*)  keepextensions=''
+    echo "You have requested that only certains extensions be included..." >&4
+    for i in $onlyextensions; do
+        case " $extensions " in
+        *" $i "*)
+            echo "Keeping extension $i."
+            keepextensions="$keepextensions $i"
+            ;;
+        *) echo "Ignoring extension $i." ;;
+        esac
+    done
+    extensions="$keepextensions"
+    ;;
+esac
+
+case "$noextensions" in
+'') ;;
+*)  keepextensions=''
+    echo "You have requested that certain extensions be ignored..." >&4
+    for i in $extensions; do
+        case " $i " in
+        " $noextensions ") echo "Ignoring extension $i." ;;
+        *) echo "Keeping extension $i.";
+           keepextensions="$keepextensions $i"
+           ;;
+        esac
+    done
+    extensions="$keepextensions"
+    ;;
+esac
+
+case "$extensions" in
+*"_File "*" Fcntl "*" IO "*) ;;
+*) echo "WARNING: Extensions DB_File or *DBM_File, Fcntl, and IO not configured." >&4
+   echo "WARNING: The Perl you are building will be quite crippled." >& 4
+   ;;
+esac
+
 : Remove libraries needed only for extensions
 : The appropriate ext/Foo/Makefile.PL will add them back in, if necessary.
 : The exception is SunOS 4.x, which needs them.
diff --git a/INSTALL b/INSTALL
index 9a661fde30..bebc24f86d 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1049,8 +1049,20 @@ Even if you do not have dynamic loading, you must still build the
 DynaLoader extension; you should just build the stub dl_none.xs
 version.  (Configure will suggest this as the default.)
 
-In summary, here are the Configure command-line variables you can set
-to turn off various extensions.  All others are included by default.
+To disable certain extensions so that they are not built, use
+the -Dnoextensions=... and -Donlyextensions=... options.  They both
+accept a space-separated list of extensions.  The extensions listed
+in C<noextensions> are removed from the list of extensions to build,
+while the C<onlyextensions> is rather more severe and builds only
+the listed extensions.  The latter should be used with extreme caution
+since certain extensions are used by many other extensions and modules:
+such modules include Fcntl and IO.  The order of processing these
+options is first C<only> (if present), then C<no> (if present).
+
+Another, older way to turn off various extensions (which is still good
+to know if you have to work with older Perl) exists.  Here are the
+Configure command-line variables you can set to turn off various
+extensions.  All others are included by default.
 
     DB_File		i_db
     DynaLoader		(Must always be included as a static extension)
-- 
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