[Omake] Re: Out-of-tree builds

[Phil Endecott]

>> Has any thought been given to using omake for out-of-tree builds of C
>> / C++ programs?  My motivation is supporting cross-compilation to
>> multiple architectures from the same source tree, e.g.
>
> With OMake's design, it is not possible to do real out-of-tree builds,
> if you mean outside-the-project-dir. However, it is possible to to
> in-tree builds with separate build directories for different build
> hosts.
>
>>    |
>>    +-- src
>>    |
>>    +-- build_x86
>>    |
>>    +-- build_arm
>
> This seems to be inside the tree, so it should work fine.  As said in
> another answer, you need to look at the vmount feature.

Actually one reason for considering doing this with omake is that I 
don't much like gmake's VPATH feature.  Specifically, in gmake I can't write

build/%.o: src/%.cc
     ${CXX} .....

because it doesn't allow / in the dependencies.  So I am forced to set 
VPATH to include the src directory and have a %.o: %.c rule in the 
build directory.  But this fails if, by any chance, you have a .o file 
in the "wrong" place, e.g. left over from an abandoned  in-the-src-dir build.

So, with omake, can I have rules that include directories, as I've 
suggested above?

Cheers,

Phil.