Re: [O] Org Babel C/C++

[Michael Hannon]

On Wednesday, March 28, 2012 at 4:01 PM Daimrod wrote:

> Eric Schulte <address@hidden> writes:
>
>> Applied, Thanks!
>>
>> Daimrod <address@hidden> writes:
>>
>>> Hi,
>>>
>>> I've made a small patch to ob-C.el so it now includes the current
>>> directory to the list of directories to be searched for header files.
>>> Without this, I cannot include a local header file because the
>>> compilation happens in /tmp and thus gcc or g++ doesn't search for
>>> header files in the directory I currently work.
>>>
>>> diff --git a/lisp/ob-C.el b/lisp/ob-C.el
>>> index f1525aa..4f33fc4 100644
>>> --- a/lisp/ob-C.el
>>> +++ b/lisp/ob-C.el
>>> @@ -96,15 +96,14 @@ or `org-babel-execute:C++'."
>>>         (progn
>>>           (with-temp-file tmp-src-file (insert full-body))
>>>           (org-babel-eval
>>> -        (format "%s -o %s %s %s -I
> \"%s\""
>>> +        (format "%s -o %s %s %s"
>>>               (cond
>>>                 ((equal org-babel-c-variant 'c)
> org-babel-C-compiler)
>>>                 ((equal org-babel-c-variant 'cpp)
> org-babel-C++-compiler))
>>>               (org-babel-process-file-name tmp-bin-file)
>>>               (mapconcat 'identity
>>>                   (if (listp flags) flags (list flags)) " ")
>>> -            (org-babel-process-file-name tmp-src-file)
>>> -            (file-name-directory (expand-file-name
> (buffer-file-name)))) ""))))
>>> +            (org-babel-process-file-name tmp-src-file))
> ""))))
>>>       ((lambda (results)
>>>         (org-babel-reassemble-table
>>>       (if (member "vector" (cdr (assoc :result-params
> params)))
>
> Hum, I'm quite embarrassed, this doesn't work when the block is executed
> during an export. I didn't track it down yet, but (buffer-file-name)
> returns nil during the export probably because the buffer changes.
>
> A workaround would be to use the :flags header argument though it's a
> bit tedious because it doesn't seem possible to eval elisp during the
> export.
>
> i.e.
>
> #+BEGIN_SRC cpp :flags -I (file-name-directory (buffer-file-name))
> ...
> #+END_SRC
>

I ran into this problem a few months ago.  I don't have the elisp skills to
patch Org mode, but I found something that worked for me:

    http://article.gmane.org/gmane.emacs.orgmode/49356/

-- Mike