# Basics

It is planned to use the `autotools` in a near future, but for now,
OwlPS uses a simple set of GNU makefiles to compile and install the
various modules. The top-level makefile will call `make` into the
subdirectories for all the modules.

At any level, you can type:

    make help

to see the usable targets and requirements to compile.

Once you have all the requirements, the easy way is to just call `make`
from the top-level directory, to build all the modules.


# Compiling

You can choose the compiler to use by setting the CC variable when
calling `make`, for example:

    make CC=tcc

By default, `clang` will be used for C modules, or `colorgcc` if `clang`
is not installed. If neither `clang` or `colorgcc` is installed, CC is
left to the `make` default.

For OwlPS Positioner (C++), `colorgcc` is used, or the default CC if it
is not installed. Please keep in mind that this module requires GCC 4.4
or later.


# Compiling on BSD systems

Remember to use `gmake` instead of `make`. From the top-level, you will
need to set the MAKE variable, for example:

    gmake MAKE=gmake

OwlPS Listener will not compile since it still contains some
Linux-specific code. You may want to comment-out the related lines of
the top-level makefile.

You might also need to set some variables, for example CC to force a
specific GCC version to be used.


# Compiling for OpenWrt

To compile for OpenWrt, you need to set the OPENWRT_VERSION when calling
make, for example:

    make OPENWRT_VERSION=10.03

It is assumed than the OpenWrt SDK is installed in
`$HOME/openwrt/buildroot` and that the target architecture is `atheros`.
For a different set up, you will need to edit the `common.mk` file.

For now, only OpenWrt 10.03 and trunk are supported. If you set
OPENWRT_VERSION to something different than "10.03", it is replaced by
"trunk".

For this to work we advise that you do something like that:

    mkdir -p ~/openwrt/atheros/trunk
    cd ~/openwrt/atheros/trunk
    ln -s ../../buildroot/staging_dir
    ln -s \
      ../../buildroot/staging_dir/target-mips_uClibc-0.9.33 \
      target-mips_uClibc
    ln -s \
      ../../buildroot/staging_dir/toolchain-mips_gcc-4.6-linaro_uClibc-0.9.33/ \
      toolchain-mips_gcc_uClibc

Of course, you will have to update the symlinks when you compile a new
version of the SDK.


# Installing

At any level, you can install what is installable by typing, as `root`:

    make install