* ext/extmk.rb (extmake): should not reduce necessary libraries.

  [ruby-dev:22440]

* lib/mkmf.rb (merge_libs): merge libraries according to
  dependency.


git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@5421 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/mkmf.rb b/lib/mkmf.rb
index 17579ec01..ab1bea1b5 100644
--- a/lib/mkmf.rb
+++ b/lib/mkmf.rb
@@ -113,6 +113,21 @@ def modified?(target, times)
   t if times.all? {|n| n <= t}
 end
 
+def merge_libs(*libs)
+  libs.inject([]) do |x, y|
+    xy = x & y
+    xn = yn = 0
+    y.each_with_index do |v, yi|
+      if xy.include?(v)
+        xi = [x.index(v), xn].max()
+        x[xi, 1] = y[yn..yi]
+        xn, yn = xi + (yi - yn + 1), yi + 1
+      end
+    end
+    x.concat(y[yn..-1] || [])
+  end
+end
+
 module Logging
   @log = nil
   @logfile = 'mkmf.log'