* lib/mkmf.rb (find_type): new method.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@12868 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,9 +1,11 @@
-Fri Aug  3 06:40:04 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Fri Aug  3 07:09:05 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/mkmf.rb: more verbose message.  [ruby-Bugs-12766]
 
 	* lib/mkmf.rb (have_type): suppress a warning with -Wall.
 
+	* lib/mkmf.rb (find_type): new method.
+
 Fri Aug  3 00:00:20 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* bignum.c (big2str_table): base cannot be 0 or 1.

lib/mkmf.rb

@@ -772,6 +772,21 @@ SRC
   end
 end
 
+def try_type(type, headers = nil, opt = "", &b)
+  if try_compile(<<"SRC", opt, &b)
+#{COMMON_HEADERS}
+#{cpp_include(headers)}
+/*top*/
+typedef #{type} conftest_type;
+int conftestval[sizeof(conftest_type)?1:-1];
+SRC
+    $defs.push(format("-DHAVE_TYPE_%s", type.strip.upcase.tr_s("^A-Z0-9_", "_")))
+    true
+  else
+    false
+  end
+end
+
 # Returns whether or not the static type +type+ is defined.  You may
 # optionally pass additional +headers+ to check against in addition to the
 # common header files.
@@ -787,18 +802,26 @@ end
 #
 def have_type(type, headers = nil, opt = "", &b)
   checking_for checking_message(type, headers, opt) do
-    headers = cpp_include(headers)
-    if try_compile(<<"SRC", opt, &b)
-#{COMMON_HEADERS}
-#{headers}
-/*top*/
-typedef #{type} conftest_type;
-int conftestval[sizeof(conftest_type)?1:-1];
-SRC
-      $defs.push(format("-DHAVE_TYPE_%s", type.strip.upcase.tr_s("^A-Z0-9_", "_")))
-      true
-    else
-      false
+    try_type(type, headers, opt, &b)
+  end
+end
+
+# Returns where the static type +type+ is defined.
+#
+# You may also pass additional flags to +opt+ which are then passed along to
+# the compiler.
+#
+# See also +have_type+.
+#
+def find_type(type, opt, *headers, &b)
+  opt ||= ""
+  fmt = "not found"
+  def fmt.%(x)
+    x ? x.respond_to?(:join) ? x.join(",") : x : self
+  end
+  checking_for checking_message(type, nil, opt), fmt do
+    headers.find do |h|
+      try_type(type, h, opt, &b)
     end
   end
 end