Date: Sat, 05 Sep 2015 09:07:00 -0700 From: Carl Johnson <carlj@peak.org> To: freebsd-questions@freebsd.org Subject: Re: GCC question Message-ID: <87oahg97ff.fsf@elk.localnet> In-Reply-To: <55EAF9BA.3080700@hiwaay.net> (William A. Mahaffey, III's message of "Sat, 5 Sep 2015 09:24:04 -0453.75") References: <55EAEE19.2060807@hiwaay.net> <20150905140658.GA790@ozzmosis.com> <55EAF9BA.3080700@hiwaay.net>
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"William A. Mahaffey III" <wam@hiwaay.net> writes: > On 09/05/15 09:13, andrew clarke wrote: >> On Sat 2015-09-05 08:34:27 UTC-0453, William A. Mahaffey III (wam@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. As long as this came up, does anybody know of a similar incantation to show the defined rules and symbols for make? I remember seeing something like that years ago, but I haven't been able to find it since. Thanks. -- Carl Johnson carlj@peak.org
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