One way can be as follows: ## pre-define your library directories based on the output of the "getconf" output format LIB_32 := /stage2/lib/dbus-1.0/include LIB_64 := /stage2/lib64/dbus-1.0/include
# then compute the architecture of the machine running gmake CFLAGS := -I$(LIB_$(strip $(shell getconf LONG_BIT))) ### now you are all set for using the CFLAGS in your build code. ## you may want to incorporate some amount of error checking # when the `getconf' command delivers output different than either 32 or 64. # another method could be to invoke the "uname -m" command. > Date: Mon, 3 Aug 2015 18:56:38 +0200 > From: bas...@starynkevitch.net > To: spk...@yahoo.com > Subject: Re: Conditional include directories > CC: help-make@gnu.org > > On Mon, Aug 03, 2015 at 04:38:37PM +0000, Mike Gran wrote: >> >> Hello all, >> >> In a standalone project makefile I want to add a -I directory >> parameter to a CFLAGS variable. >> >> On a 32-bit box, I need to add it as >> -I/stage2/lib/dbus-1.0/include >> >> One a 64-bit box, I need to add it as >> -I/stage2/lib64/dbus-1.0/include >> >> There are a bunch of ways to do this, I guess. > > > A possible way might be to use pkg-config. Your Dbus library might be > registered in some pkg-config *.pc file. > > http://www.freedesktop.org/wiki/Software/pkg-config/ > > A way of using it in your Makefile: > http://stackoverflow.com/questions/20145132/makefiles-how-can-i-use-them/20146082#20146082 > > Regards > -- > Basile Starynkevitch http://starynkevitch.net/Basile/ > France basile at starynkevitch dot net > > _______________________________________________ > Help-make mailing list > Help-make@gnu.org > https://lists.gnu.org/mailman/listinfo/help-make _______________________________________________ Help-make mailing list Help-make@gnu.org https://lists.gnu.org/mailman/listinfo/help-make
