6432d78bff
Two layers were missing for ollama-vulkan after the 0.30.x bump's switch to
per-accelerator runners via ExternalProject_Add:
1. spirv-headers wasn't in nativeBuildInputs, so the parent cmake configure
never even saw `SPIRV-HeadersConfig.cmake`. Add it (header-only — native
is the right slot).
2. The runner sub-builds (`ollama-llama-server-vulkan` et al.) are launched
by `cmake/local.cmake`'s `ExternalProject_Add`, whose child cmake process
inherits env vars but not the parent's `-D` flags. Even after fixing
(1), the child's `find_package(SPIRV-Headers REQUIRED)` at
`ggml-vulkan/CMakeLists.txt:14` couldn't see the config, and once that
was worked around with `CMAKE_PREFIX_PATH` as env, the compile then
failed with `fatal error: spirv/unified1/spirv.hpp` — because
upstream's `target_link_libraries(ggml-vulkan PRIVATE Vulkan::Vulkan)`
notably does NOT link `SPIRV-Headers::SPIRV-Headers`, so the interface
include path the cmake config exports never flows into the compile
commands. Force the include via `NIX_CFLAGS_COMPILE` rather than
patching upstream's CMakeLists across llama.cpp pins.
Verified: `ollama-vulkan` builds end-to-end; `$out/lib/ollama/vulkan/libggml-vulkan.so`
is present (not a silent CPU fallback like the cuda variant suffered in
the first 0.30 attempt).
🤖 Assisted by Claude
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