iamdoubz
c7899e72a2
The cmake crate strips -O*/O* from CFLAGS and, with no explicit generator on MSVC, overwrites CMAKE_C_FLAGS_RELEASE — so the previous CFLAGS=/O2 attempt could never work (verified: /DNDEBUG survived, /O2 stripped). With CMAKE_GENERATOR=Ninja the override branch is skipped and CMake's default Release flags (/O2 /Ob2 /DNDEBUG) reach ggml.
15 lines
835 B
TOML
15 lines
835 B
TOML
# Fix: whisper.cpp (whisper-rs-sys) is configured by the cmake crate, which on
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# MSVC *without an explicit generator* overwrites CMAKE_C_FLAGS_RELEASE with
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# unoptimized flags (it also strips any -O*/O* flag from CFLAGS, so env
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# optimization flags can't survive). Result: ggml's CPU kernels compiled at
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# /Od — CPU-only transcription ran ~40x slower than real time (bench finding
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# W1, docs/benchmarks/2026-07-parakeet-vs-whisper.md). With a generator set,
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# cmake-rs skips that override (`if generator.is_none() && msvc` in
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# cmake-0.1.58) and CMake's default Release flags (/O2 /Ob2 /DNDEBUG) apply.
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# Ninja ships with VS Build Tools; builds already require vcvars64 (which puts
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# it on PATH). NDEBUG kept explicitly so C deps never build with asserts on.
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[env]
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CMAKE_GENERATOR = "Ninja"
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CFLAGS = "/DNDEBUG"
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CXXFLAGS = "/DNDEBUG"
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