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[benchmark] Use -Os to match firmware optimization level

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CodSpeed benchmarks were building with -O2, while all firmware
targets (ESP8266, ESP32, LibreTiny) use -Os. This mismatch means
the benchmarks cannot detect inlining regressions that affect real
devices — GCC under -O2 inlines functions that -Os outlines due to
its size-conscious cost model.

Switch to -Os with -ffunction-sections/-fdata-sections for proper
dead-code stripping (needed because -Os preserves references that
-O2 optimizes away at compile time).
This commit is contained in:
J. Nick Koston
2026-04-12 18:37:50 -10:00
parent ab64916c37
commit 02f828fcbf
1 changed files with 3 additions and 0 deletions
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script/cpp_benchmark.py
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@@ -27,7 +27,10 @@ STUBS_DIR: Path = Path(root_path) / "tests" / "benchmarks" / "stubs"
PLATFORMIO_OPTIONS = { PLATFORMIO_OPTIONS = {
"build_flags": [ "build_flags": [
"-Os", # match firmware optimization level (detects inlining regressions)
"-g", # debug symbols for profiling "-g", # debug symbols for profiling
"-ffunction-sections", # required for dead-code stripping with -Os
"-fdata-sections", # required for dead-code stripping with -Os
"-DUSE_BENCHMARK", # disable WarnIfComponentBlockingGuard in finish() "-DUSE_BENCHMARK", # disable WarnIfComponentBlockingGuard in finish()
f"-I{STUBS_DIR}", # stub headers for ESP32-only components f"-I{STUBS_DIR}", # stub headers for ESP32-only components
], ],