Date: Wed, 21 Mar 2018 08:29:39 +0100 (CET) From: =?ISO-8859-1?Q?Trond_Endrest=F8l?= <Trond.Endrestol@fagskolen.gjovik.no> To: FreeBSD questions <freebsd-questions@freebsd.org> Subject: Re: "Portable" conditionalization of Makefiles Message-ID: <alpine.BSF.2.21.1803210826060.66427@mail.fig.ol.no> In-Reply-To: <99925.1521593119@segfault.tristatelogic.com> References: <99925.1521593119@segfault.tristatelogic.com>
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On Tue, 20 Mar 2018 17:45-0700, Ronald F. Guilmette wrote: > > > I have a pile of (mostly) C code that I wrote myself over the past > several years. I developed it on FreeBSD but have always thought > that it would be Nice if it compiled and ran also on Linux. > > I just spent about a day editing the various files to make it all > compile and link OK on Linux. So that part is all done now. But > here's the one remaining problem: > > There's a chance that I may distribute this stuff someday. When and > if I do, I'd like to be able to tell people to "just run make" in the > top-level directory, regardless of whether they are on Linux or *BSD. > (I -could- just tell people to use gmake if they are on *BSD, but I'd > rather not.) > > So anyway, the problem is that on Linux, I have to link in some different > libraries to make the stuff work. Specifically, I have to add -lresolv > to the link command. But that's a no-go for FreeBSD, whose linker > will rightly complain about the missing library if it sees that extra > option. > > Obviously, I need to conditionalize some small bits of my Makefile, but > I need to do that in a way that will cause -neither- GNU Make nor FreeBSD > make to barf all over everything. > > Of course, these two make programs have implemented different, and > apparently incompatable syntaxes for conditionalization... with the > FreeBSD make using directives like ifeq/else/endif and GNU make using > directives like .if/.else/.endif > > I *really* don't want to use any mechanism which builds the Makefile > on the fly, like configure/autoconf and friends. (I have always felt > that those things were abominations... basically elephant guns, often > used ridiculously to kill mere gnats.) > > It occurs to me that I can't have been the first person to have come > up against this problem. But I don't know that solution. Is there > already a well known and widely used motif or convention for how to > code up conditional parts of Makefiles in such a way that they will > do what's needed, conditionally, when run through -either- GNU Make > or FreeBSD make? While not a perfect solution, how about using BSDmakefile for use with make(1) on the BSDs, and GNUmakefile for use with GNU Make on GNU/Linux? Maybe you can couple this with a Makefile.commom to handle the common bits. Should a user run gmake on BSD under these conditions, they might get a surprise. -- Trond.
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