Hi there,
In my system I have a number (about 200) so called "packets" which act as a sort of
libraries. Each packet foo resides in directory foo and consists of files:
foo.h
foo.c
tfoo.c
As a result of building a packet foo.h goes to $(idir) (is copied), foo.o to $(odir)
(after compilation) and tfoo to $(tdir) (after compilation and linkage). The trouble
is that in order to completly build a packet many other packets must be build first,
so that dependencies of foo.c, tfoo.c (.h files) and of tfoo (.o files) are satisfied.
The net of dependencies is so complicated that is is virtually impossible to guess
the correct order of compilation.
So I have written a "master" makefile wich looks like this (in real makefile all files
are prepended by paths):
all: foo.h foo.o sth.h sth.o junk.h ...
foo.h foo.o: bar.h junk.h sth.h bar.o junk.o sth.o
command-to-build-packet foo
sth.h sth.o: other.h junk.h other.o junk.o
command-to-build-packet sth
the command-to-build-packet is just 'make -C <packet> all install'
Now where is the problem:
Supposing packet sth has been build from scratch by hand, then sth.o and sth.h are the
newest of all file. Running this makefile causes make to invoke 'make -C foo all
install' for foo packet, which is all right now -everything is recompiled. But second
execution of make cause make also to invoke command to build packet foo. It is because
foo.h in its destination dir depends on foo.h in foo dir and nothing else. So the
make for packet foo does nothing. Sometimes after touching a single file several
dozens of commands are invoked that do not nothing, which is very annoying.
But I must to write the rules this way, as command-to-build-packet creates all the
files, not only the one for which it has been invoked.
So, without writing dependencies for foo.h the command-to-build-packet will fail, as
the compilation of foo.c will fail due to unsatisfied dependencies.
What I need is: how to write such "master" makefile that would know all the
dependencies and would build packets in proper order without any redundancies.
I hope I made myself clear (my english isn't perfect). I was trying to devise some
better solution for this but I did't manage to. You are my last resort.
thanks in advance
--
Maciej Walezak
-GDN-
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