cargo-xwin drives the Windows MSVC cross-compile via clang-cl, under which CMake sets MSVC=1 — causing libopus 1.3.1's `if(NOT MSVC)` guards to skip the per-file `-msse4.1` / `-mssse3` COMPILE_FLAGS that its x86 SIMD source files need. Clang-cl (unlike real cl.exe) still honors Clang's target-feature system, so those files then fail to compile with "always_inline function '_mm_cvtepi16_epi32' requires target feature 'sse4.1'" errors across silk/NSQ_sse4_1.c, NSQ_del_dec_sse4_1.c, and VQ_WMat_EC_sse4_1.c. Earlier attempts to fix this downstream (cargo-xwin toolchain file, override.cmake CMAKE_C_COMPILE_OBJECT <FLAGS> replace, CFLAGS env vars) all failed because cargo-xwin rewrites override.cmake from scratch on every `cargo xwin build` invocation and cmake-rs's -DCMAKE_C_FLAGS= assembly happens before toolchain FORCE sets propagate. Fixing it upstream at the source: vendor audiopus_sys 0.2.2 into vendor/audiopus_sys, patch its bundled opus/CMakeLists.txt to introduce an MSVC_CL var (true only when CMAKE_C_COMPILER_ID == "MSVC", i.e. real cl.exe), and flip the eight `if(NOT MSVC)` SIMD guards to `if(NOT MSVC_CL)`. Clang-cl then gets the GCC-style per-file flags and the SSE4.1 sources build cleanly. Also flip the `if(MSVC)` global /arch block at line 445 to `if(MSVC_CL)` so only cl.exe applies /arch:AVX and clang-cl relies purely on per-file flags (no global/per-file mixing). Wire via [patch.crates-io] in the workspace root Cargo.toml; the patch is resolved relative to the workspace root as `vendor/audiopus_sys`. Upstream context: xiph/opus#256, xiph/opus PR #257 (both stale). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Change Log
An overview of changes:
[0.2.0]
- Now requires
cmake. - Windows will build via
cmaketoo. - Windows pre-built binaries have been removed.
- Updated
bindgento version0.58.
[0.1.8]
This release adds build support for FreeBSD.
[0.1.7]
Add missing opus-folder.
[0.1.6]
This release removes the bindgen-dependency from the default features.
Additionally, the bindgen-feature has been added in order to generate a new binding.
[0.1.4 and 0.1.5]
v0.1.4:
This release fixes a problem where audiopus_sys could not find the
Opus folder.
v0.1.5: Convert Unix-relevant files' EOLs from CRLF to LF inside the opus-folder.
Fix
- Bundle the Opus project again.
- Added missing
cfgonfind_via_pkg_config.
[0.1.3]
Fixes build-issues related to pkg-config.
[0.1.2]
This release adds the ability to bypass pkg-config.
Added:
- Ignore
pkg-configwhenLIBOPUS_NO_PKGorOPUS_NO_PKGis set. - Print the dynamic/static build cause via
cargo:info. - Add missing repository-link in
Cargo.toml.
[0.1.1]
Added:
- Copy Opus' source to
OUT_DIRbefore building to avoid modifying and generating files outside ofOUT_DIR.
Fixed:
- Convert Unix-relevant files' EOLs from
CRLFtoLFinside theopus-folder. - Resolve unused import warnings when building with Unix.