Add XS and VX build and test support

[xross]

Summary

• Build and test lib_xassert on both XS and VX architectures.
• Use lib_basix for portable trap, timer, delay, and print support.
• Replace XS-specific timer assembly and toolchain dependencies.
• Add portable C coverage for assertions, failures, unreachable code, and timing checks.
• Retain XC compatibility tests on XS while excluding them from VX builds.
• Make application hardware targets overrideable from Jenkins.
• Use XJSL runPytest() for test execution and reporting.

Dependency

Depends on the corresponding lib_basix compatibility changes (released in v0.1.0)

[Copilot]

Pull request overview

This PR updates lib_xassert to build and run its examples/tests on both XS and VX targets by switching platform-specific trap/print/timer dependencies to lib_basix, adding portable C-based tests, and updating CI (Jenkins) to run architecture-specific build/test flows.

Changes:

• Replace XS-specific trap/timer usage with lib_basix APIs in the xassert public header and example code.
• Add new C test applications/expected outputs and gate XC-compatibility tests behind a CMake option for VX builds.
• Update Jenkins pipeline to build/test separately on XS and VX and use runPytest() for reporting; make hardware target overrideable via APP_HW_TARGET.

Reviewed changes

Copilot reviewed 39 out of 39 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/CMakeLists.txt	Adds C-test subdirectories and gates XC tests via XASSERT_BUILD_XC_TESTS.
tests/assert_c_test/src/main.c	New C assertion test app.
tests/assert_c_test/CMakeLists.txt	Registers new C assertion test app with overrideable target.
tests/assert_c_test.expect	Expected output for C assertion failure.
tests/assert_unit_c_test/src/main.c	New C “unit” assertion test with per-unit debug config.
tests/assert_unit_c_test/CMakeLists.txt	Registers new C unit assertion test app.
tests/assert_unit_c_test.expect	Expected output for unit assertion failure.
tests/fail_c_test/src/main.c	New C fail() test app.
tests/fail_c_test/CMakeLists.txt	Registers new C fail() test app.
tests/fail_c_test.expect	Expected output for fail().
tests/unreachable_c_test/src/main.c	New C unreachable() test app.
tests/unreachable_c_test/CMakeLists.txt	Registers new C unreachable() test app.
tests/unreachable_c_test.expect	Expected output for unreachable().
tests/timing_block_c_test/src/main.c	Updates timing test to use basix_delay_ticks().
tests/timing_debug_c_test/src/main.c	Updates timing test to use basix_delay_ticks().
tests/timing_loop_c_test/src/main.c	Replaces hwtimer usage with basix_delay_ticks().
tests/assert_test/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
tests/assert_test_unit/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
tests/fail_test/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
tests/unreachable_test/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
tests/timing_block_test/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
tests/timing_debug_test/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
tests/timing_loop_test/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
tests/timing_block_c_test/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
tests/timing_debug_c_test/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
tests/timing_loop_c_test/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
examples/deps.cmake	Adds lib_basix as a common example dependency.
examples/app_assert/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
examples/app_fail/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
examples/app_timed_block/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
examples/app_timed_loop/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
examples/app_timing_loop_exception/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
examples/app_unreachable/CMakeLists.txt	Makes APP_HW_TARGET overrideable.
examples/app_timed_loop/src/fn_no_assert.c	Switches printing include to <basix/print.h>.
lib_xassert/lib_build_info.cmake	Declares lib_basix dependency at 0.1.0.
lib_xassert/api/xassert.h	Switches to lib_basix trap/print/time APIs and BASIX timer frequency.
Jenkinsfile	Splits XS/VX build+test stages and uses runPytest().
README.rst	Documents XS/VX support and adds lib_basix as a dependency.
CHANGELOG.rst	Adds UNRELEASED entries describing the changes.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[xalbertoisorna]

I have not done a extensive review but all looks good one minor comment.

[xalbertoisorna]

Ive observed xrun and xsim produce different outputs?