* grc: Implement --output functionality for grcc
Reference gnradio Issue #2799.
This commit adjusts some logic and code to enable the --output switch
for grcc.
Prior to this commit, grcc would only output to the GRC_HIER_PATH.
The commit adjusts the various Generators in grc/core/generator to
consistently use
output_dir for the output directory.
If it's None, then take from the platform.config.hier_block_lib_dir
attribute which can be set via the
GRC_HIER_PATH env var.
The cpp_top_block generator was also modified to remote its __init__ function
which appeared identical to its base TopBlockGenerator.
I did not test c++ GRC output.
* Make output directory if does not exist
* Duplicate TopBlockGenerator __init__ without .py extension; base class object
* Typo in os.makedirs kwarg
* Added _warnings method from TopBlockGenerator
Signed-off-by: Jared Dulmage <jared.dulmage@caliola.com>
All of the removed `from __future__ import` were needed in older
versions of Python (mostly 2.5.x and below) but later became mandatory
in most versions of Python 3 hence are not necessary anymore.
More specifically, according to __future__.py[1]:
- unicode_literals is part of Python since versions 2.6.0 and 3.0.0;
- print_function is part of Python since versions 2.6.0 and 3.0.0;
- absolute_import is part of Python since versions 2.5.0 and 3.0.0;
- division is part of Python since versions 2.2.0 and 3.0.0;
Get rid of those unnecessary imports to slightly clean up the codebase.
[1] https://github.com/python/cpython/blob/master/Lib/__future__.py
