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From: Richard Stanton <stanton@haas.berkeley.edu>
To: 'Eric Schulte' <eric.schulte@gmx.com>
Cc: "'emacs-orgmode@gnu.org'" <emacs-orgmode@gnu.org>
Subject: Re: Problems running C code in org-mode under Windows - SOLVED
Date: Thu, 29 Mar 2012 10:29:41 -0700	[thread overview]
Message-ID: <40C7B1BFC291ED4E9D10436D07736A334702EB9BA9@EXMAIL7.haas.uc.berkeley.edu> (raw)

> One problem - when using bash as the shell, when trying to execute the
> compiled file, it tries to execute the empty file, not the file that was just
> compiled (which has the same name, but the extension .exe, added by the
> compiler).
> A partial solution to this is to append ".exe" to the name of the binary temp
> file if running under Windows. E.g., start org-babel-C-execute something
> like this:
> (defun org-babel-C-execute (body params)
>   "This function should only be called by `org-babel-execute:C'
> or `org-babel-execute:C++'."
>   (let* ((tmp-src-file (org-babel-temp-file
> 			"C-src-"
> 			(cond
> 			 ((equal org-babel-c-variant 'c) ".c")
> 			 ((equal org-babel-c-variant 'cpp) ".cpp"))))
>          (tmp-bin-file (org-babel-temp-file
> 			"C-bin-"
> 			(if (equal system-type 'windows-nt) ".exe" "")))
> [...]
> I say "partial solution" because the output in the org file is *still* blank, but
> at least the program does get run this way...

Solved (approximately):

Here was the org file I was using:

#+begin_src C :includes <stdio.h>
    int a=2;
    int b=3;
    printf("%d\n", a+b);

This ran fine, but returned an error code of 2, which caused problems. When I added the extra line

at the end, it ran fine.

To allow for people who might be using the Cygwin bash shell in Emacs under Windows (which is recommended by many),  I do recommend making the change I suggested above, adding the following lines to ob-C.el:

>          (tmp-bin-file (org-babel-temp-file
> 			"C-bin-"
> 			(if (equal system-type 'windows-nt) ".exe" "")))

This prevents bash trying to run an (empty) file with no extension when the compiler has generated a file with a ".exe" extension. Otherwise, it looks like I now have this running fine. 

I also suggest not creating an empty binary file and just letting the compiler create it, unless this poses some risks I'm not seeing.


             reply	other threads:[~2012-03-29 17:29 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-29 17:29 Richard Stanton [this message]
  -- strict thread matches above, loose matches on Subject: below --
2012-03-29 17:41 Problems running C code in org-mode under Windows - SOLVED Richard Stanton
2012-03-29 19:18 ` Nick Dokos

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