尝试使用SWIG将C ++编译为Ruby时，没有这样的文件或目录“ ruby​​ / config.h”

Question

I'm trying to get a basic example running using SWIG to convert a C++ file into Ruby. I have Ruby 2.0.0p451 (64 bit version) installed and I've also installed the 64-bit DevKit. I'm running Windows 7 and trying to use swigwin-2.0.12. Finally, I am using the GCC C++ compiler supplied by Mingw-builds for the 64-bit version of Windows.

I have the basic C++ hello world program as shown below.

#include <iostream>
#include <cstdlib>

using namespace std;

main()
{
    cout << "Hello World!";
    system("pause");
    return 0;
}

At the command prompt, I use the command:

swig -module -c++ -ruby hello_world.cpp

This completes fine and produces a file titled hello_world_wrap.cxx . However, when I receive an error when I try to compile the .cxx file using the command:

g++ -fPIC -c hello_world_wrap.cxx -IC:\Ruby200-x64\include\ruby-2.0.0

The error I am receiving is:

All the research I've done has pointed me to an installation of the incorrect DevKit, but I don't think this is my issue. I've made sure to download the 64-bit version of Ruby and the DevKit. I've checked the folder specified in the error, and there is no config.h file. I'm not sure why the config.h file does not exist or why ruby.h is trying to load it.

Any thoughts?

Answer 1

Check that C:\\Ruby200-x64\\include\\ruby-2.0.0\\ruby\\config.h exists. If not, find it and fix the path.

Update:

Check if there is a ruby.h in the same folder. If there is then just use -IC:\\Ruby200-x64\\include\\ruby-2.0.0\\ruby\\x64-mingw instead. Otherwise try adding a second -I, for this extra path. I agree with you this is a little strange (not so much the former, but definitely if you have to have two -I). The script at https://groups.google.com/forum/m/#!topic/comp.lang.ruby/RpjuvXpFI30 suggests that this might be normal, Ie you need one -I for platform-independent headers and one for platform-dependent.