module_c.lb

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2016-2017, Niklas Hauser
# Copyright (c) 2017-2018, Fabian Greif
# Copyright (c) 2018, Christopher Durand
#
# This file is part of the modm project.
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
# -----------------------------------------------------------------------------


def init(module):
    module.name = ":stdc"
    module.description = """\
# C Standard Environment

Refines the C language to make it easier to use on embedded targets.


## ARM Cortex-M

Additional compiler options:

- `--specs=nano.specs`: use Newlib Nano (when not using exceptions).
- `--specs=nosys.specs`: No additional C library features are implemented.
"""

def prepare(module, options):
    core = options[":target"].get_driver("core")["type"]

    if core.startswith("avr") or core.startswith("cortex-m"):
        module.depends(":architecture:assert")

    return True

def build(env):
    core = env[":target"].get_driver("core")["type"]

    if core.startswith("cortex-m"):
        env.outbasepath = "modm/ext/gcc"
        env.copy("cabi_cortex.c", "cabi.c")

        # Compiler options for targets
        env.collect(":build:linkflags", "--specs=nosys.specs")
        if not env.get(":stdc++:exceptions", False):
            # Newlib Nano does not support C++ exceptions at all
            env.collect(":build:linkflags", "--specs=nano.specs")