Resurrect HelloBaremetal - #9296
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abadams
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The referenced README_cmake.md doesn't exist; the cross-compiling section it pointed to lives in doc/HalideCMakePackage.md. Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
…om apps/CMakeLists.txt, add CI
Audited all three documented cross-compilation methods
(cmake-twice/cmake-super_build/cmake-external_project) plus each one's
"host target" build mode, and verified every one of them for real:
actual cross-compile with the arm-none-eabi toolchain, actual run under
QEMU with semihosting, not just a host build check. Along the way:
- CMAKE_PREFIX_PATH wasn't forwarded into cmake-super_build's and
cmake-external_project's ExternalProject_Add sub-builds, breaking the
documented host-target build for both.
- The NEON-enable trampoline and a getentropy syscall stub (needed
because Ubuntu 24.04's arm-none-eabi-gcc/newlib pulls in
std::random_device support transitively through libstdc++'s
exception/COW-string machinery -- itself pulled in by ordinary
std::set/std::string use in halide_image_io.h -- which rdimon.specs
doesn't implement) are now a single cmake/noosrt.s, built once by the
toolchain file itself and linked into every executable automatically
via CMAKE_<LANG>_STANDARD_LIBRARIES, the same mechanism the toolchain
already uses for libgcc/libc. The BAREMETAL variable and the
per-project if(BAREMETAL) blocks that used to wire this in are gone.
- run_baremetal.sh quoted "${QEMU_MACHINE_ARGS}" as a single string
instead of expanding it as separate arguments, so QEMU always
rejected it as one bogus option -- this script never actually worked.
- cmake-twice and cmake-external_project no longer need their
GEN_PACKAGE/GEN_EXE override plumbing (upstream's own default naming
is sufficient); cmake-super_build keeps it as the one demo of that
flexibility.
- Each run.sh was a one-line wrapper around run_baremetal.sh; replaced
with a real CTest test (add_test + PASS_REGULAR_EXPRESSION
"Success!"), guarded by CMAKE_CROSSCOMPILING so it only registers for
the actual cross-compile, not the host-target build.
- Removed the top-level apps/HelloBaremetal/CMakeLists.txt: it only
existed to be add_subdirectory()'d via the old
add_app(HelloBaremetal), which is now gone.
Disconnects HelloBaremetal from apps/CMakeLists.txt (matching
HelloAndroid/HelloAndroidCamera2/HelloWasm) and adds a dedicated
baremetal-apps job to testing-linux.yml that installs an arm-none-eabi
toolchain and QEMU, then actually builds and runs all three methods
under semihosting via ctest.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## alexreinking/apps-android #9296 +/- ##
=============================================================
+ Coverage 69.98% 70.01% +0.03%
=============================================================
Files 258 258
Lines 77353 77353
Branches 18837 18837
=============================================================
+ Hits 54137 54162 +25
+ Misses 17648 17630 -18
+ Partials 5568 5561 -7 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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The HelloBaremetal builds had bit-rotted and the code was insufficiently tested.
This fixes the builds, changes the runtime to Ubuntu's ARM toolchain, and adds a dedicated baremetal-apps job to testing-linux.yml. It installs an arm-none-eabi toolchain and QEMU, then actually builds and runs all three methods under semihosting via ctest.
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