The _guess_or_check_idf_target() function has sdkconfig and sdkconfig.defaults
file names hardcoded. Since config file names may be specified with SDKCONFIG
or SDKCONFIG_DEFAULTS cmake vars, directly in CMakeLists.txt or passed in with
the -D cmake option, they are not respected.
Problem is when SDKCONFIG or SDKCONFIG_DEFAULTS is set in
CMakeLists.txt. While idf can detect cmake vars passed through it
to cmake via the -D option, detecting SDKCONFIG and SDKCONFIG_DEFAULTS
vars settings in CMakeLists.txt would require to parse it. This seems
like error prone approach. Also if the vars defined by the -D option
are passed directly to cmake, not via idf, they will not be visible to idf.
It seems reasonable to move the logic into cmake, where we know the correct
SDKCONFIG and SDKCONFIG_DEFAULTS values. So the IDF_TARGET detection/guessing
is moved into targets.cmake, where the IDF_TARGET is actually set. The target
is guessed based on the following precendence.
1) $ENV{IDF_TARGET}
2) IDF_TARGET
3) SDKCONFIG
4) sdkconfig
5) SDKCONFIG_DEFAULTS if non-empty or
$ENV{SDKCONFIG_DEFAULTS} if non-empty or
sdkconfig.defaults
6) esp32
All config files referred in $ENV{SDKCONFIG_DEFAULTS} and SDKCONFIG_DEFAULTS
are searched, compared to the current behaviour. First target found in the
above chain is used.
The original _guess_or_check_idf_target() is renamed to _check_idf_target() and
used for the target consistency checks only.
The get_sdkconfig_filename() helper is now used to get the sdkconfig file
for consistency checks. It looks in SDKCONFIG specified with the -D
option and project_description.json.
With this change config full paths are reported in messages, so it's clear
e.g. from which config the target was guessed from or which config has
consistency problem. test_non_default_target.py was adjusted to this
change and also new test for testing the IDF_TARGET guessing was added.
Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>
This feature was added when we thought that target components might be
added out of IDF tree. That never became possible, and with recent
changes in IDF architecture it is unlikely that this feature will be
necessary any time soon. Remove it, simplifying the code.
This is an experimental feature intended at the moment for ESP-IDF
developers only.
If IDF_TOOLCHAIN=clang environment variable or CMake variable is set,
use toolchain-clang-esp32xx.cmake instead of toolchain-esp32xx.cmake.
These changes aren't sufficient to actually build any IDF project with
clang; subsequent commits add a few workarounds required to do this.
Toolchain files are added for esp32 and esp32s2, which are the targets
supported in our llvm-project fork at the moment.
