* ext/dbm/extconf.rb: don't choose 'dbm' if _GDB_H_ is defined which

is available since GDBM 1.9 because 'gdbm_compat' is appropriate
  choise since GDBM 1.8.1.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34682 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Sun Feb 19 00:25:55 2012  Tanaka Akira  <akr@fsij.org>
+
+	* ext/dbm/extconf.rb: don't choose 'dbm' if _GDB_H_ is defined which
+	  is available since GDBM 1.9 because 'gdbm_compat' is appropriate
+	  choise since GDBM 1.8.1.
+
 Sat Feb 18 23:27:00 2012  Kenta Murata  <mrkn@mrkn.jp>
 
 	* random.c: remove a duplicated comment.

ext/dbm/extconf.rb

@@ -141,6 +141,13 @@ def headers.db_check2(db, hdr)
   # The original ndbm is provided by libc in 4.3BSD.
   have_ndbm_header_macro = have_macro('_DBM_IOERR', hdr, hsearch)
 
+  # GDBM provides NDBM functions in libgdbm_compat since GDBM 1.8.1.
+  # GDBM's ndbm.h defines _GDBM_H_ since GDBM 1.9.
+  # So, reject 'gdbm'.  'gdbm_compat' is required.
+  if have_gdbm_header_macro && db == 'gdbm'
+    return false
+  end
+
   # ndbm.h is provided by the original (4.3BSD) dbm,
   # Berkeley DB 1 in libc of 4.4BSD and
   # ndbm compatibility layer of gdbm.