Re: loop to create variables, foreach?

[Vardhan Varma]

Is there any way to insert 'newline' at foreach's expansion.
e.g. i want to run COMMAND on each of the value.
Can i write:
        $(foreach v,$(VAR) COMMAND $a  \n)
        i can use ';' on unix, and '&' on command, but that
doesn't look clean. on win-nt, i want to run make in 'shell-less' mode,
i.e. without invoking sh or cmd.exe.

Also, can i define targets and depenency using foreach construct ?

Better than that, can make have a option, to always invoke
a preproceser ( m4 , cpp) over the makefile it reads. it's really
simple implementation wise ( fopen(file) ==> popen( "cmd file" ))

--Vardhan


At 03:20 AM 01-08-01, Paul D. Smith wrote:
> %% Anton Deguet <address@hidden> writes:
>
>   ad> I want to build multiple lists of files based on the same string
>   ad> substitution using some kind of loop.  I tried something with foreach,
>   ad> that is:
>
>   ad> libs = lib1 lib2
>
>   ad> lib1_cfiles_prefix = file1 file2 file3
>   ad> lib2_cfiles_prefix = fichier1 fichier2 fichier3
>
>   ad> now I want to build some object lists called lib1_obj, lib2_obj, 
> etc...
>   ad> which would contain:
>
>   ad> lib1_obj = my_bin_dir/file1.o my_bin_dir/file2.o my_bin_dir/file3.o
>   ad> lib2_obj = my_bin_dir/fichier1.o my_bin_dir/fichier2.o  ...
>
> The expansion of functions in general cannot themselves be complete make
> command line such as variable settings.  And although this kind of works
> in some limited conditions, they absolutely cannot expand to multiple
> lines and have that work in any way.
>
> This is the major new feature to be added in GNU make 3.80.
>
>   ad> Can I force some kind of evaluation to set the variable during the
>   ad> iteration of the foreach?
>
> No.
>
>   ad> Any other solution/suggestion is welcome.
>
> You can create a rule which writes the results of the expansion out to a
> file, then include that file in your makefile:
>
>   include variable.mk
>
>   variable.mk: Makefile
>       @rm -f $@
>       @for l in $(libs); do \
>         echo "$$l"'_obj = $$('"$$l"'_cfiles_prefix:%=my_bin_dir/%.o))' >> 
> $@; \
>        done
>
> or something like that.  For the example you give here it's not really
> clear to me that it's worth all this trouble, but maybe your actual code
> is more complicated.
>
> --
> -------------------------------------------------------------------------------
>  Paul D. Smith <address@hidden>          Find some GNU make tips at:
>  http://www.gnu.org                      http://www.paulandlesley.org/gmake/
>  "Please remain calm...I may be mad, but I am a professional." --Mad 
> Scientist
>
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--
Vardhan Varma <address@hidden> ... till Yahoo is free


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