fix(void): report pywhispercpp 1.5.0 and load CPU variants at runtime (#49)

Fixes #43
Fixes #44

packaging/void/srcpkgs/python3-pywhispercpp/template

@@ -3,7 +3,7 @@ pkgname=python3-pywhispercpp
 version=1.5.0
 revision=1
 build_style=python3-module
-hostmakedepends="cmake pkg-config python3-setuptools python3-wheel $(vopt_if vulkan shaderc)"
+hostmakedepends="cmake pkg-config python3-setuptools python3-setuptools_scm python3-wheel $(vopt_if vulkan shaderc)"
 makedepends="python3-devel $(vopt_if vulkan vulkan-loader-devel)"
 depends="python3-numpy python3-requests python3-tqdm python3-platformdirs $(vopt_if vulkan vulkan-loader)"
 short_desc="Python bindings for whisper.cpp speech recognition"
@@ -20,21 +20,23 @@ build_options="vulkan"
 build_options_default="vulkan"
 
 pre_build() {
-	# The sdist derives its version from git metadata, which is absent in
-	# the xbps build root, so inject the pinned version explicitly. This is
-	# the same version install.sh (PYWHISPERCPP_VERSION) and uv.lock pin.
-	export PYWHISPERCPP_VERSION=${version}
-	# Portable x86-64 baseline: GGML_NATIVE is ggml's default and compiles
-	# libggml-cpu with -march=native, so the package would inherit the
-	# builder's instruction set and SIGILL on older CPUs (#938).
-	# GGML_NATIVE=OFF alone is not enough: while the native default is on,
-	# ggml turns every GGML_* SIMD option on and still compiles -mavx2
-	# -mfma (#957). Each option is pinned off, mirroring the Flatpak build.
-	# Shared libraries with an $ORIGIN rpath let the extension resolve the
-	# whisper.cpp libraries installed beside it (as install.sh does), with
-	# no LD_LIBRARY_PATH at runtime. (setup.py install never builds a
-	# wheel, so NO_REPAIR is meaningless here and deliberately unset.)
-	export CMAKE_ARGS='-DCMAKE_INSTALL_RPATH=$ORIGIN -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DBUILD_SHARED_LIBS=ON -DGGML_NATIVE=OFF -DGGML_SSE42=OFF -DGGML_AVX=OFF -DGGML_AVX2=OFF -DGGML_BMI2=OFF -DGGML_FMA=OFF -DGGML_F16C=OFF'
+	# Version (#43). setup.py passes no version to setup(); the version comes
+	# from setuptools-scm, which the sdist declares as a build requirement and
+	# which hostmakedepends provides. The xbps build root has no git metadata,
+	# so pin the version through setuptools-scm. Without it setuptools falls
+	# back to 0.0.0. The sdist's PYWHISPERCPP_VERSION hook is never called.
+	export SETUPTOOLS_SCM_PRETEND_VERSION=${version}
+	# CPU (#44). GGML_BACKEND_DL builds each CPU variant (x64 baseline,
+	# sandybridge, haswell, icelake, zen4, ...) as its own library. The
+	# extension, through patches/, loads the variants that sit beside it, and
+	# ggml picks the best one the host CPU supports. The x64 baseline always
+	# ships, so the package still runs on any x86-64 CPU, and hosts with AVX2
+	# use it. GGML_NATIVE must stay OFF: ggml refuses it with GGML_BACKEND_DL,
+	# and it keeps -march=native out of every variant (#938).
+	# Shared libraries with an $ORIGIN rpath let each variant resolve
+	# libggml-base beside it, with no LD_LIBRARY_PATH at runtime. (setup.py
+	# install never builds a wheel, so NO_REPAIR is meaningless here.)
+	export CMAKE_ARGS='-DCMAKE_INSTALL_RPATH=$ORIGIN -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON -DBUILD_SHARED_LIBS=ON -DGGML_NATIVE=OFF -DGGML_BACKEND_DL=ON -DGGML_CPU_ALL_VARIANTS=ON'
 	if [ -n "$build_option_vulkan" ]; then
 		# Vulkan acceleration for every GPU vendor. There is no CUDA
 		# build: Void ships no CUDA toolkit package.
@@ -42,6 +44,20 @@ pre_build() {
 	fi
 }
 
+pre_install() {
+	# The backend modules (libggml-cpu-*.so, libggml-vulkan.so) are written to
+	# build/bin, a CMake directory whose whisper.cpp setup fixes, and setup.py
+	# installs only the build/lib tree that holds the extension. Copy them
+	# beside the extension, where patches/ loads them from.
+	local backend found=""
+	for backend in build/temp.*/_pywhispercpp/bin/libggml-*.so; do
+		[ -f "$backend" ] || continue
+		cp "$backend" build/lib.*/
+		found=1
+	done
+	[ -n "$found" ] || msg_error "no ggml backend modules were built; the CPU variants are missing\n"
+}
+
 post_install() {
 	vlicense LICENSE
 }