GCC question

William A. Mahaffey III wam at hiwaay.net
Sat Sep 5 14:18:36 UTC 2015

On 09/05/15 09:13, andrew clarke wrote:
> On Sat 2015-09-05 08:34:27 UTC-0453, William A. Mahaffey III (wam at hiwaay.net) wrote:
>>> I have some code which was originally SGI native, then moved to Linux
>> (FC14 x86_64 & CentOS 5). I am now interested in getting it going under
>> FreeBSD 9.3R. Due to differences in system header file includes, I need
>> to tweek some of my app-specific header files. I have poked around the
>> (*COPIOUS* !!!!) GCC man page & I couldn't find (or missed) either how
>> to get it to regurgitate its default compiler-defines or a tabulation of
>> those defines, so I can use them to conditionally include system headers
>> in my own header files. Where is this info :-) ? TIA & have a nice
>> (long) weekend.
> You probably want:
> gcc -dM -E - < /dev/null
> Ordinarily to detect FreeBSD you'd use:
> #ifdef __FreeBSD__
> ...
> #endif

*Booooyah* !!!! Both worked AOK. I haven't used gcc in a while, so there 
may be a few more noob-ish questions to follow :-/ .... Thanks again & 
have a nice weekend.


	William A. Mahaffey III


	"The M1 Garand is without doubt the finest implement of war
	 ever devised by man."
                            -- Gen. George S. Patton Jr.

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