Contribution description

This moves CPU and CPU_MODEL to Makefile.features for a selection of board that currently cause no difference at all in the dependency parsing.

This was accepted in "Tracking: move CPU/CPU_MODEL to Makefile.features" #11477 and more precisely by this PR "Makefile.features: prerequisites for moving CPU/CPU_MODEL to boards/Makefile.features" #11478

cpu/$(CPU)/Makefile.features and cpu/$(CPU)/Makefile.dep are
automatically included

Part of moving CPU/CPU_MODEL definition to Makefile.features to have it
available before Makefile.include.

Review procedure

This PR modifications are only

• moving CPU, CPU_MODEL to a different file
• removing the include $(RIOTCPU)/cpu_name/...
• Removing the export CPU and export CPU_MODEL as they are globally exported in

  RIOT/makefiles/vars.inc.mk

  Lines 11 to 12 in 3e75383

  	export CPU # The CPU, set by the board's Makefile.features.
  	export CPU_MODEL # The specific identifier of the used CPU, used for some CPU implementations to differentiate between different memory layouts. Set by the board's Makefile.features.

• It removed the comment saying "we set the cpu" as it is quite obvious. If it is not it should be part of a board porting guide.

The testing procedure dumps all variables used for dependency parsing and compare that the new value is consistent.

The dependency to #12004 is only for testing and could be merged without it.

Testing procedure

Review of the new state

In the PR run

./dist/tools/buildsystem_sanity_check/save_all_dependencies_resolution_variables.sh  build/deps/cpu_model
...
# This takes more than 2 hours on my machine

Then run the aggregation script:

#! /bin/bash

set -ue

readonly DIRECTORY=$1

set -v
rm -f ${DIRECTORY}/tests/nordic_softdevice/info-global/dependencies_info-boards-supported_reel  # Remove as not generated by normal compilation
rm -rf ${DIRECTORY}/tests/cpu_efm32_features # Remove as issues with BOARD being unconditionally set https://github.com/RIOT-OS/RIOT/pull/12009
find "${DIRECTORY}" -type f -name 'dependencies_info_*' | sort | xargs cat > ${DIRECTORY}/deps_info
find "${DIRECTORY}" -type f -name 'dependencies_info-boards-supported_*' | sort | xargs cat > ${DIRECTORY}/deps_info-boards-supported

./generate_aggregated.sh build/deps/cpu_model

Now the value of CPU and CPU_MODEL info-boards-supported and the normal dependency parsing are the same except for boards that are not migrated by this PR:

diff -W 80 -y --suppress-common-lines build/deps/cpu_model/deps_info-boards-supported build/deps/cpu_model/deps_info | grep -e BOARD -e 'CPU ' -e CPU_MODEL | awk '!x[$0]++'
CPU =                                 | CPU = nrf52
CPU =                                 | CPU = nrf51
CPU =                                 | CPU = stm32f1
CPU_MODEL =                           | CPU_MODEL = stm32f103c8
CPU =                                 | CPU = cc2538
CPU_MODEL =                           | CPU_MODEL = cc2538nf53
CPU =                                 | CPU = lm4f120
CPU_MODEL =                           | CPU_MODEL = LM4F120H5QR
CPU =                                 | CPU = esp32
CPU_MODEL =                           | CPU_MODEL = esp32
CPU =                                 | CPU = esp8266
CPU_MODEL =                           | CPU_MODEL = esp8266
CPU =                                 | CPU = fe310
CPU_MODEL =                           | CPU_MODEL = fe310_g000
CPU_MODEL =                           | CPU_MODEL = fe310_g002
CPU_MODEL =                           | CPU_MODEL = lpc1768
CPU =                                 | CPU = kinetis
CPU_MODEL =                           | CPU_MODEL = mk60dn512vll10
CPU_MODEL =                           | CPU_MODEL = nrf51x22xxaa
CPU =                                 | CPU = mips_pic32mx
CPU_MODEL =                           | CPU_MODEL = p32mx470f512h
CPU =                                 | CPU = mips_pic32mz
CPU_MODEL =                           | CPU_MODEL = p32mz2048efg100
CPU =                                 | CPU = efm32
CPU_MODEL =                           | CPU_MODEL = efr32mg12p332f1024gl125

Note that currently there are still differences in both parsing with

DISABLE_MODULE DEFAULT_MODULE USEMODULE FEATURES_REQUIRED FEATURES_USED FEATURES_OPTIONAL FEATURES_CONFLICT FEATURES_MISSING CPU_FAM

Comparison with the previous state

On the commit: "squash! make: add targets to debug dependencies variables " run the same generation:

./dist/tools/buildsystem_sanity_check/save_all_dependencies_resolution_variables.sh  build/deps/ref
# This takes more than 2 hours on my machine
./generate_aggregated.sh build/deps/ref

It did not change the variables used when normal dependency parsing:

diff build/deps/ref/deps_info build/deps/cpu_model/deps_info
# no difference

And in general nothing changed except CPU and CPU_MODEL values being now declared in info-boards-supported:

diff -r -W 80 -y  --suppress-common-lines build/deps/ref/ build/deps/cpu_model/ -I 'CPU ' -I 'CPU_MODEL ' --exclude='deps_info*'

I need to exclude the aggregated file as diff reports a few lines with CPU / CPU_MODEL even if I asked to ignore them.

$ diff -r -W 80 -y  --suppress-common-lines build/deps/ref/ build/deps/cpu_model/ -I 'CPU ' -I 'CPU_MODEL '
diff -r -W 80 -y --suppress-common-lines -I 'CPU ' -I 'CPU_MODEL ' build/deps/ref/deps_info-boards-supported build/deps/cpu_model/deps_info-boards-supported
BOARD = opencm904                     | BOARD = opencm904
CPU =                                 | CPU = stm32f1
CPU_MODEL =                           | CPU_MODEL = stm32f103cb
BOARD = nz32-sc151                    | BOARD = nz32-sc151
CPU =                                 | CPU = stm32l1
CPU_MODEL =                           | CPU_MODEL = stm32l151rc
BOARD = pba-d-01-kw2x                 | BOARD = pba-d-01-kw2x
CPU =                                 | CPU = kinetis
CPU_MODEL =                           | CPU_MODEL = mkw21d256vha5
BOARD = slwstk6220a                   | BOARD = slwstk6220a
CPU =                                 | CPU = ezr32wg
CPU_MODEL =                           | CPU_MODEL = ezr32wg330f256r60
BOARD = stm32f0discovery              | BOARD = stm32f0discovery
CPU =                                 | CPU = stm32f0
CPU_MODEL =                           | CPU_MODEL = stm32f051r8
BOARD = saml21-xpro                   | BOARD = saml21-xpro
CPU =                                 | CPU = saml21
CPU_MODEL =                           | CPU_MODEL = saml21j18a
BOARD = remote-reva                   | BOARD = remote-reva
CPU =                                 | CPU = cc2538
CPU_MODEL =                           | CPU_MODEL = cc2538sf53

Issues/PRs references

• Tracking: move CPU/CPU_MODEL to Makefile.features Tracking: move CPU/CPU_MODEL to Makefile.features #11477
• Depends on the debug targets from: make: add targets to debug dependencies variables make: add targets to debug dependencies variables #12004 (could be removed before merging if it can get it sooner through)