GitLab

As discussed in #504

The autogenerated header files have been moved about, and an extra
include dir has been added, which means you can give a custom
BUILD=newbuilddir option to make, and everything "just works"

Also tidied up the way the different Makefiles build their include-
directory flags

In conjunction with #504 this allows you to do things like:
```shell
make -C unix clean && make -C unix test CC=gcc-4.7
```
all from the top-level micropython directory :-)

Something similar could probably be done for windows/Makefile too, but I don't have a cygwin setup to test with.

Makes it easier for 64-bit unix hosts to build 32-bit unix
binaries (for testing)

Disabled by default.  Enabled in unix port.

This change allows to build unix version without libreadline installed.

To allow easily try different optimization and configuration options
without patching any files.

Both return int so far (single-precision float doesn't have enough
bits to represent int32 precisely).

Hopefully this works for other people as well :)

Proof of concept, controls "ffi" module as one which requires external
dependencies.

Foreign Function Interface module allows to load native dynamic libraries,
call functions and access variables in them. This makes possible to write
interface modules in pure Python.

This module provides thin wrapper around libffi. ctypes compatibility might
be possible to implement on top of this module (though ctypes allow to call
functions without prototypes, which is not supported by libffi (i.e.
implementation would be inefficient))).

Also, don't try to force debug info format, use native.

Can now have null bytes in strings.  Can define ROM qstrs per port using
qstrdefsport.h

Use make V=1e make V=1 or set BUILD_VERBOSE in your environment to increase build verbosity.

This should fix issue #117

Note: only read/write/close methods are defined so far, and class
is not exposed (use open() factory function, as usual).

Now much more inline with how CPython does types.

With MICROPY_EMIT_X64 and MICROPY_EMIT_THUMB disabled, the respective
emitters and assemblers will not be included in the code.  This can
significantly reduce binary size for unix version.

So far, only start and stop integer indexes are supported. Step is
not supported, as well as objects of arbitrary types.

mpconfig.h will automatically pull mpconfigport.h.

import works for simple cases.  Still work to do on finding the right
script, and setting globals/locals correctly when running an imported
function.

termcap is not needed on Linux.  Need to work out how to automatically
configure the Makefile...

E.g.:
/usr/lib/libreadline.so.4.0: undefined reference to `tgetnum'
/usr/lib/libreadline.so.4.0: undefined reference to `tgoto'
/usr/lib/libreadline.so.4.0: undefined reference to `tgetflag'
/usr/lib/libreadline.so.4.0: undefined reference to `tputs'
/usr/lib/libreadline.so.4.0: undefined reference to `tgetent'
/usr/lib/libreadline.so.4.0: undefined reference to `tgetstr'

Tested on linux too, works.

Readline is GPL, so linking with it casts the binary GPL.