Re: /lib/cpp not found in c-mode

["Jan D." <jan.h.d@swipnet.se>]

>>> In that case, c-macro-preprocessor is set to "/lib/cpp -C" and
>>> c-macro-expand
>>> doesn't work on OSX?
>>
>> If c-macro-preprocessor is a recent variable I can't check because
>> Emacs does not currently compile on Mac OSX 10.3.  My (a bit old) CVS
>> compile does not seem to have it.
>
> c-macro-expand and c-macro-preprocessor have been around for quite a
> while. c-macro-expand is an interactive autoloaded Lisp function in 
> cmacexp.el
> that can be invoked in C mode with C-c C-e or from the menu-bar.  
> Apparently
> this file is not part of cc-mode so perhaps its not being maintained.
> c-macro-expand seems quite useful so I'm kind of surprised that, as a C
> specialist, you're don't use it/not familiar with it.

I must have misspelled the name when looking for it.  I've seen the 
macro expand region menu item in the C menu, but actually never had any 
use for it.

>
>> But c-macro-expand does not work:
>
> If we added the line below to c-macro-preprocessor would it work then 
> for Mac
> OSX?

Yes it would.

	Jan D.


> Nick
>
>
> (defcustom c-macro-preprocessor
>   ;; Cannot rely on standard directory on MS-DOS to find CPP.  In
>   ;; fact, cannot rely on having cpp.exe, either, in latest GCC
>   ;; versions.
>   (cond ((eq system-type 'ms-dos) "gcc -E -C -o - -")
> 	;; Solaris has it in an unusual place.
> 	((and (string-match "^[^-]*-[^-]*-\\(solaris\\|sunos5\\)"
> 			    system-configuration)
> 	      (file-exists-p "/opt/SUNWspro/SC3.0.1/bin/acomp"))
> 	 "/opt/SUNWspro/SC3.0.1/bin/acomp -C -E")
>         ((file-exists-p "/usr/ccs/lib/cpp") "/usr/ccs/lib/cpp -C")
> +	((eq system-type 'darwin) "cpp -C")
> 	(t "/lib/cpp -C"))
>   "The preprocessor used by the cmacexp package.
>
> If you change this, be sure to preserve the `-C' (don't strip comments)
> option, or to set an equivalent one."
>   :type 'string
>   :group 'c-macro)