zlib: try zlib source

* ext/zlib/extconf.rb: try building zlib from the source if
  exists.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56204 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 33 insertions, 1 deletions

diff --git a/ext/zlib/extconf.rb b/ext/zlib/extconf.rb
index 8bbede63b2..71bcc577d1 100644
--- a/ext/zlib/extconf.rb
+++ b/ext/zlib/extconf.rb
@@ -13,7 +13,24 @@ dir_config 'zlib'
 
 if %w'z libz zlib1 zlib zdll zlibwapi'.find {|z| have_library(z, 'deflateReset')} and
     have_header('zlib.h') then
+  have_zlib = true
+else
+  unless File.directory?(zsrc = "#{$srcdir}/zlib")
+    dirs = Dir.open($srcdir) {|z| z.grep(/\Azlib-\d+[.\d]*\z/) {|x|"#{$srcdir}/#{x}"}}
+    dirs.delete_if {|x| !File.directory?(x)}
+    zsrc = dirs.max_by {|x| x.scan(/\d+/).map(&:to_i)}
+  end
+  if zsrc
+    $INCFLAGS << " -I$(ZSRC)"
+    if $mswin or $mingw
+      $libs = append_library($libs, "zdll")
+      dll = "zlib1.dll"
+    end
+    have_zlib = true
+  end
+end
 
+if have_zlib
   defines = []
 
   Logging::message 'checking for kind of operating system... '
@@ -57,6 +74,21 @@ if %w'z libz zlib1 zlib zdll zlibwapi'.find {|z| have_library(z, 'deflateReset')
   have_func('adler32_combine', 'zlib.h')
   have_type('z_crc_t', 'zlib.h')
 
-  create_makefile('zlib')
+  create_makefile('zlib') {|conf|
+    if zsrc
+      conf << "ZSRC = $(srcdir)/#{File.basename(zsrc)}\n"
+      conf << "all:\n"
+      if $mingw or $mswin
+        conf << "ZIMPLIB = zdll.lib\n"
+        conf << "$(TARGET_SO): $(ZIMPLIB)\n"
+        conf << "$(ZIMPLIB):\n"
+        conf << "\t$(MAKE) -f $(ZSRC)/win32/Makefile.#{$nmake ? 'msc' : 'gcc'} TOP=$(ZSRC) $@\n"
+        conf << "install-so: $(topdir)/#{dll}"
+        conf << "$(topdir)/#{dll}: $(ZIMPLIB)\n"
+        conf << "\t$(Q) $(COPY) #{dll} $(BINDIR)\n"
+      end
+    end
+    conf
+  }
 
 end