Re: help with makefile command line

[Kevin Rodgers <kevin.d.rodgers@gmail.com>]

stan wrote:
> Richard G Riley wrote:
>> "Balaji V. Iyer" <bviyer@ncsu.edu> writes:
>>
>>> Hello Everyone,
>>>     I use the compile option extenstively in emacs. When I type "M-x
>>> compile" the default line is "make -k" Many times I do not have a make
>>> file thus I would lke the default line to be
>>>  
>>> "gcc -ansi -O4 -Wall <c_source_file>"
>>>  
>>> How do I do this?
>>>  
>>> I tried the following command but it doesn't seem to work (If anyone
>>> have a better idea please let me know).
>>>  
>>> (function
>>>  (lambda ()
>>>    (unless (or (file-exists-p "makefile")
>>>                (file-exists-p "Makefile"))
>>>      (setq compile-command
>>>            (concat "gcc -Wall -O3 -o"
>>>                    (file-name-sans-extension (file-name-nondirectory
>>> buffer-file -name))
>>>                    " "
>>>                    (file-name-nondirectory buffer-file-name))))))
> <snip>
> 
> Seems like it might be easier to write a makefile :) 

You don't need to write a Makefile, because make has built-in rules that
handle this.

(add-hook 'c-mode-hook
	  (lambda ()
	    (set (make-local-variable 'compile-command)
		 (format "make %s"
			 (file-name-sans-extension
			  (file-name-nondirectory buffer-file-name))))))

Just set the CC=gcc and CFLAGs="-Wall -O3" environment variables, and voila!

-- 
Kevin Rodgers
Denver, Colorado, USA