On Thu, 5 Dec 2002, Tzafrir Cohen wrote: > On Thu, 5 Dec 2002, guy keren wrote: > > > > > Makefiles should not be medled with. if you try to do something > > complicated - most likely you'll fail, cause the language that gmake (and > > the commercial 'make' variants) supports - are very very limited. > > A chalange, then, ha?
not realy - gnu make's language realy _is_ very limited. every once in a while i try to enhance the Makefile of the project i work on (been using gnu make for such things since around 97 - so i thought i should be able to do what i want with it) - and eventually fall back to using cut and paste, external aliases and scripts and the like - because of the limits of its language, and the lack of a proper debugger (or proper error messages). > (reading the gnu-make manual) so did i yet again before i wrote my previous post ;) > Well, the best I could find was: "target-spesific values" > > There is one more special feature of target-specific variables: when > you define a target-specific variable, that variable value is also in > effect for all prerequisites of this target (unless those prerequisites > override it with their own target-specific variable value). So, for > example, a statement like this: > > prog : CFLAGS = -g > prog : prog.o foo.o bar.o > > will set `CFLAGS' to `-g' in the command script for `prog', but it will > also set `CFLAGS' to `-g' in the command scripts that create `prog.o', > `foo.o', and `bar.o', and any command scripts which create their > prerequisites. > > So how about: > > ppc: ARC=PPC > ppc: release > > release: > ifeq ($(ARCH),PPC) > (is that the right syntax?) tzafrir, if you want a challenge - then _try_ what you write. it does not work and will not work, because of a simple reason - the given variable is being defined ONLY inside the commands of the rule. this 'ifeq' is NOT part of the commands for the rule - since it is a gnu make command. the 'commands of the rule', as i perceive the term now, are only the _shell_ commands of the rule. > The problem is that 'release' has to be a pre-requirement of ppc. the problem is - this does not work as you think it does ;) > But then-again, recursive makes are not much nicer. but at least they can be understood, and they do work. -- guy "For world domination - press 1, or dial 0, and please hold, for the creator." -- nob o. dy ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
