ext/re2/extconf.rb in re2-0.2.0 vs ext/re2/extconf.rb in re2-0.3.0

@@ -10,9 +10,36 @@
 
 $CFLAGS << " -Wall -Wextra -funroll-loops"
 
 have_library("stdc++")
 if have_library("re2")
+
+  # Determine which version of re2 the user has installed.
+  # Revision d9f8806c004d added an `endpos` argument to the
+  # generic Match() function.
+  #
+  # To test for this, try to compile a simple program that uses
+  # the newer form of Match() and set a flag if it is successful.
+  checking_for("RE2::Match() with endpos argument") do
+    test_re2_match_signature = <<SRC
+#include <re2/re2.h>
+
+int main() {
+  RE2 pattern("test");
+  re2::StringPiece *match;
+  pattern.Match("test", 0, 0, RE2::UNANCHORED, match, 0);
+
+  return 0;
+}
+SRC
+
+    # Pass -x c++ to force gcc to compile the test program
+    # as C++ (as it will end in .c by default).
+    if try_compile(test_re2_match_signature, "-x c++")
+      $defs.push("-DHAVE_ENDPOS_ARGUMENT")
+    end
+  end
+
   create_makefile("re2")
 else
   abort "You must have re2 installed and specified with --with-re2-dir, please see http://code.google.com/p/re2/wiki/Install"
 end