[Tutorial] SketchUp Ruby C Extension

thomthom

Is it possible to build an Ruby C Extension under Windows that doesn't require additional libraries? When using Visual C++ to build the extensions require the C++ runtime library.

tbd

yes. my old example did that. best is to check the DLL imports section to see what functions it requires

thomthom

@unknownuser said:

yes. my old example did that. best is to check the DLL imports section to see what functions it requires
Ah, the Pelles C project! Is it possible to use to to just compile the C source without creating a project? (just trying to find a solution without creating too many extra project files.)

tbd

@unknownuser said:

Is it possible to use to to just compile the C source without creating a project? (just trying to find a solution without creating too many extra project files

the .ppj file is just a collection of commands. you can easily convert it to a .bat file if you dont want to have extra files (remember to create the .def file for the .dll link)

thomthom

Do you remember the cause of the C:\ruby\src\ruby-1.8.6-p111\missing.h(71): error #1050: Redefinition of macro 'isinf'. error? And can you explain what your workaround actually do?

Trying to set up a project myself so I actually understand this.

thomthom

And why is the macro redefinition just a warning for this guy, but an error in Pelles C?
https://github.com/barrie0482/rrdruby_win32_build/wiki

thomthom

hm... there is an msvcrt-ruby18.dll in the SketchUp folder - can I make my Visual Studio C++ project rely on this instead? So when the C Extension loads under SketchUp Ruby the runtime is there - installed by SketchUp. ??

thomthom

@unknownuser said:

@unknownuser said:

And can you explain what your workaround actually do?

isinf is already defined in PellesC libraries so there is no need to include that file again.

But I am not including it myself - it's an error that comes from the Ruby missing.h file... :S


Building hello_world.obj.
Use <stdlib.h> instead of non-standard <malloc.h>
C;\ruby\src\ruby-1.8.6-p111\missing.h(71); error #1050; Redefinition of macro 'isinf'.
*** Error code; 1 ***
Done.

thomthom

@unknownuser said:

http://msdn.microsoft.com/en-us/library/windows/desktop/ms682586(v=vs.85).aspx - the DLL is already loaded by Sketchup so it will use that version.

When compiling with Pelles C, right? Any way to make VC++'s nmake rely on the bundled SketchUp CRT instead of the VSC++ CRT? (splitting my quest into two projects here...)

tbd

@unknownuser said:

And can you explain what your workaround actually do?

isinf is already defined in PellesC libraries so there is no need to include that file again.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms682586(v=vs.85).aspx - the DLL is already loaded by Sketchup so it will use that version. also you can copy the msvcrt-ruby18.dll in your dev directory to be picked up when debugging outside Sketchup (which I hope you do, otherwise dev time is slooooow)

tbd

@thomthom said:

But I am not including it myself - it's an error that comes from the Ruby missing.h file... :S

that's why you need to have #define HAVE_ISINF 1 in your code, so that Ruby will not double include

@unknownuser said:

Any way to make VC++'s nmake rely on the bundled SketchUp CRT instead of the VSC++ CRT? (splitting my quest into two projects here...)

compile with the same VC or dont link any CRT and use a replacement static lib (there are some minimal libs on the net)

thomthom

@unknownuser said:

compile with the same VC

_MSC_VER == 1200 = MVC 6, right? Can you get hold of that version any more?

@unknownuser said:

or dont link any CRT and use a replacement static lib (there are some minimal libs on the net)

Here you lost me. "linking"... another concept I need to learn.

thomthom

That is still greek to me... The only thing I compiled before these Ruby C Extensions where Visual Basic 4 applications...

Dan Rathbun

@thomthom said:

@unknownuser said:

or dont link any CRT and use a replacement static lib (there are some minimal libs on the net)

Here you lost me. "linking"... another concept I need to learn.

As .. in statically linked, or dynamically linked.

(Hence the DLL and dylib, means Dynamically Linked Library.)

tbd

if you want to have fun - http://www.benshoof.org/blog/minicrt/

thomthom

@dan rathbun said:

@thomthom said:

@unknownuser said:

or dont link any CRT and use a replacement static lib (there are some minimal libs on the net)

Here you lost me. "linking"... another concept I need to learn.

As .. in statically linked

hmm... so I could take my C Extension made with VC++'s nmake and statically link the RT - avoiding having to bundle it or require the users to install any additional RT?

tbd

yes. the dll were created to solve the duplicate code problem but they created another problem - the DLL hell.

but for SU extensions having a couple of kB duplicated for the CRT is ok. also it makes the installing easier.

thomthom

@unknownuser said:

but for SU extensions having a couple of kB duplicated for the CRT is ok. also it makes the installing easier.

And from I gathered of the Wiki article, then the DLLs are statically linked they can link just the part of the library required. ??

Now I need to figure out how to statically link the CRT. Is it as simple as a compiler flag?

thomthom

-MT instead of -MD seem to be the one...
http://stackoverflow.com/questions/8463073/nmake-vc-2010-compile-without-msvcr100-dll-depends

http://msdn.microsoft.com/en-us/library/2kzt1wy3%28v=vs.80%29.aspx

thomthom