From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Stanton <stanton@haas.berkeley.edu>
Subject: Re: Problems running C code in org-mode under Windows
Date: Tue, 27 Mar 2012 23:00:39 -0700
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To: 'Eric Schulte' <eric.schulte@gmx.com>
Cc: "'emacs-orgmode@gnu.org'" <emacs-orgmode@gnu.org>

> I think the "Access is denied" problem is probably the same as that liste=
d
> here:
>=20
> http://lists.gnu.org/archive/html/help-gnu-emacs/2010-04/msg00247.html
>=20
> Unfortunately, when I switch to using bash as my shell under Windows, thi=
s
> causes problems with python-mode (though this is not really your
> problem...) This change does get the compilation to work on my machine,
> however, and a .exe file is created. So far so good...
>=20
> However, the output still appears blank in the org buffer. More tracing
> required...

One problem - when using bash as the shell, when trying to execute the comp=
iled file, it tries to execute the empty file, not the file that was just c=
ompiled (which has the same name, but the extension .exe, added by the comp=
iler).=20

A partial solution to this is to append ".exe" to the name of the binary te=
mp 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=20
			"C-bin-"
			(if (equal system-type 'windows-nt) ".exe" "")))

[...]

I say "partial solution" because the output in the org file is *still* blan=
k, but at least the program does get run this way...

One question - why create a temp file for the executable before running the=
 compilation? Why not just have it created by the compiler?