Date: Fri, 09 Jun 2006 15:47:24 -0700 From: Darren Pilgrim <freebsd@bitfreak.org> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-hackers@FreeBSD.ORG, jeremie@le-hen.org Subject: Re: How to disable a src.conf on command-line Message-ID: <4489FA7C.7080207@bitfreak.org> In-Reply-To: <20060609.153340.-432838362.imp@bsdimp.com> References: <20060609094052.GH1273@obiwan.tataz.chchile.org> <20060609.074844.1324583587.imp@bsdimp.com> <4489E354.5070201@bitfreak.org> <20060609.153340.-432838362.imp@bsdimp.com>
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M. Warner Losh wrote: > In message: <4489E354.5070201@bitfreak.org> > Darren Pilgrim <darren.pilgrim@bitfreak.org> writes: > : M. Warner Losh wrote: > : > So if you make WITH_SSP off by default, then having WITH_SSP in the > : > src.conf can't be overridden. If you have it on by default, having > : > WITHOUT_SSP in the src.conf file can't be overriden. this appears to > : > be an unintended flaw with the with/without stuff. I'm not sure the > : > right way to compensate. > : > : I can't speak for the "right" way, but if you specify the variable in > : src.conf/make.conf with ?= instead of =, you can override it on the > : command-line: > : > : # grep KERNCONF /etc/make.conf > : KERNCONF?=TTPWEB > : # make -V KERNCONF > : TTPWEB > : # env KERNCONF=SOMETHING_ELSE make -V KERNCONF > : SOMETHING_ELSE > > ?= doesn't mesh well with WITH/WITHOUT because then it will always be > defined, thus defeating its purpose. Use .ifndef to define WITH/WITHOUT iff its counterpart is undef: .ifndef WITHOUT_FOO WITH_FOO=def .endif -- Darren Pilgrim
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