From: "Darryl L. Pierce" <mcpierce@...>
Date: 2012-04-18T21:30:38+09:00
Subject: extconf.rb and checking for C++ headers

I'm extending our project [1] with some native extensions. Our code is
written (currently) all in C++, and we use Swig to provide Ruby
bindings.

For the extconf.rb file previous I've just had:

---8<[snip]---
require 'mkmf'

create_makefile('nonblockio')
---8<[snip]---

However, now I'd like to customize the file a little more in order to
support both Ruby 1.8 and 1.9. Between those two versions of Ruby we
have a different set of header files that are required. So, anyway,
I've added the following the check for headers:

---8<[snip]---
require_header("qpid/messaging/exceptions.h")
require_header("qpid/messaging/Address.h")
require_header("qpid/messaging/Connection.h")
---8<[snip]---

The problem comes with the first header. It's being found, but because
it contains C++ includes, specified:

#include <string>

mkmf is failing saying it "can't find" the header, though the error is:

/usr/local/include/qpid/types/Exception.h:25:18: fatal error: string:
No such file or directory

How do I tell mkmf to use C++ headers?


[1] http://qpid.apache.org

-- 
Darryl L. Pierce <mcpierce@gmail.com>
Visit the Infobahn Offramp: <http://mcpierce.multiply.com>
"Bury me next to my wife. Nothing too fancy..." - Ulysses S. Grant