# Makefile for cargo-make
#
# In general, cargo-make has reasonable default tasks for this project. The tasks 
# defined in this makefile are generally a catalogue of tasks that are known to work 
# plus some tweaks where necessary. The absence of a target here doesn't necessarily
# mean it won't work and be appropriate.

[env]
TARGET = "arm-unknown-linux-gnueabihf"      # First generation Raspberry Pi.

# These default tasks all build for the host platform (not the Raspberry Pi) so are
# great for working on the overall structure and documentation etc, but can't be used
# for building applications to run on the Raspberry Pi.
# 
# Note that the default "build" task enables all features so will use the "mockspi"
# feature. This is probably what you want unless you're actually compiling natively on
# Raspberry Pi hardware. If that's what you really want, uncomment the args override.
[tasks.build]
# args = ["build"]

[tasks.test]

# Ensure we generate docs for testing by including the "mockspi" feature.
[tasks.docs]
args = ["doc", "--no-deps", "--features", "mockspi"]  

[tasks.build-flow]

# The following tasks are specifically for targetting the Raspberry Pi itself and all
# use cross to cross compile and test the code.

# There is a potential problem with the RaspberryPi targets not being consistent because
# of an interaction between build scripts (build.rs) and the cross-compilation 
# environment.  Currently (as of cross v0.2.4) the cross compilation environment is
# a rather old Ubuntu 16.04 container. If a local build (on the PC host) is run before 
# making one of these RaspberryPi targets, the cross build will find an existing
# build script in the target directory left over from the local build.  In theory that's
# probably OK because the build script isn't expected to run on the target machine just
# in the cross-compilation container, which is still an x86 Linux.  However, the build
# script may depend on a glibc version too far ahead of the version in the container to
# be compatible and therefore fail to run.  
#
# Two workarounds have some merit:
#
#   1) Build the RaspberryPi targets before the local host targets because the build 
#      script compiled in the cross-compilation container will work with the more 
#      recent glibc on the host machine.
#
#   2) Force a clean before running the RaspberryPi targets to remove the incompatible
#      build script.
#
# This looks like being a short-term problem because the next version of cross should
# bump the base version of Ubuntu to 20.04.
[tasks.rpi]
command = "cross"
args = ["build", "--target", "${TARGET}"]

[tasks.build-rpi]
command = "cross" 
args = ["build", "--release", "--target", "${TARGET}"]

[tasks.test-rpi]
command = "cross"
args = ["test", "--target", "${TARGET}"]

# Generate the changelog
[tasks.changelog]
command = "git"
args = ["cliff", 
		"--tag", "v${CARGO_MAKE_CRATE_VERSION}", 
		"--output", "CHANGELOG.md"]