Build configured extension libraries only

Consider the libraries, which remain exts.mk but not listed in
ext/configure-ext.mk, removed.

1 files changed, 11 insertions, 1 deletions

diff --git a/template/exts.mk.tmpl b/template/exts.mk.tmpl
index 521b9b2708..5a72912839 100644
--- a/template/exts.mk.tmpl
+++ b/template/exts.mk.tmpl
@@ -12,10 +12,16 @@ notes = {}
 rubies = []
 exeext = RbConfig::CONFIG['EXEEXT']
 gnumake = false
+confexts = nil
 opt = OptionParser.new do |o|
   o.on('--gnumake=BOOL') {|v| gnumake = v == 'yes'}
+  o.on('--configure-exts=FILE') {|v| confexts = v}
   o.order!(ARGV)
 end
+confexts &&= File.read(confexts).scan(/^exts: (.*\.mk)/).flatten rescue nil
+confexts ||= []
+macros["old_extensions"] = []
+
 contpat = /(?>(?>[^\\\n]|\\.)*\\\n)*(?>[^\\\n]|\\.)*/
 Dir.glob("{ext,.bundle/gems}/*/exts.mk") do |e|
   gem = /\Agems(?=\/)/ =~ e
@@ -24,6 +30,7 @@ Dir.glob("{ext,.bundle/gems}/*/exts.mk") do |e|
     v.gsub!(/\\\n[ \t]*/, ' ')
     next if v.empty?
     next if gem and n != "extensions"
+    n = "old_extensions" if n == "extensions" and !confexts.include?(e)
     v = v.split
     m = macros[n] ||= []
     case n
@@ -128,7 +135,8 @@ libencs:
 ext/extinit.<%=objext%>:
 	$(Q)$(MAKE)<%=mflags%> V=$(V) EXTINITS="$(EXTINITS)" $@
 
-% exts = macros["extensions"].map {|e|e.chomp("/.")}.sort
+% exts = (macros["extensions"] + macros["old_extensions"])
+% exts.map! {|e|e.chomp("/.")}.sort
 % targets.each do |tgt|
 %   exts.each do |d|
 %     t = "#{d}/#{tgt}"
@@ -158,3 +166,5 @@ extso:
 <%= k %>:<%= d.join(' ') %>
 <%= n.join("") %>
 % end
+
+remove-old-extensions: $(old_extensions:/.=/distclean)