Use portable $(python) preprocessor for Kconfig

[jserv]

This replaces $(shell,...) call with portable $(python,...) preprocessor function from Kconfiglib for boolean environment detection. $(python) built-in evaluates Python code in-process and returns "y"/"n" without spawning a shell, eliminating POSIX shell dependencies (2>/dev/null, || echo) and improving Windows portability.

Simple checks (SDL2, SDL2_mixer) are inlined directly using the run()/shutil.which() helpers available in the $(python,...) namespace. Complex checks (compiler type, LLVM 18, RISC-V toolchain) delegate to detect-env.py via run(sys.executable, ...) with exit-code signaling.

---

Summary by cubic

Switch Kconfig detection to the portable $(python,...) preprocessor to remove POSIX shell dependencies and improve Windows support. Simple checks run in-process; complex checks call detect-env.py and signal results via exit codes.

• Refactors
  • Replace $(shell,...) with $(python,assert ...) for boolean symbols (emcc, clang/gcc, SDL2, SDL2_mixer, LLVM 18, RISC-V toolchain).
  • Inline SDL2/SDL2_mixer checks using shutil.which/pkg-config; avoid spawning a shell.
  • Derive COMPILER_TYPE from CC_IS_EMCC/CLANG/GCC with Kconfig defaults; fallback to "Unknown".
  • Delegate complex checks to tools/detect-env.py via run(sys.executable, ...); exit 0/1 drives y/n.
  • Update detect-env.py: exit-code booleans, lazy compiler probing, and capture stderr in --version for emcc.

^{Written for commit 2a635b4. Summary will update on new commits.}

[jserv]

Benchmarks

Details

Benchmark suite	Current: 2a635b4	Previous: 8092c66	Ratio
Dhrystone	1554 DMIPS	1535.333 DMIPS	0.99
CoreMark	1108.112 iterations/sec	1110.937 iterations/sec	1.00

This comment was automatically generated by workflow using github-action-benchmark.