feat(compat.openblas): new package + eigen backend-openblas feature#54
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compat.openblas builds OpenBLAS 0.3.33 from source via its xpkg install() hook (build-dep xim:make), BLAS-only (NO_FORTRAN/NO_LAPACK, TARGET=GENERIC, static), producing libopenblas.a. It `provides = ["blas"]` and exposes <cblas.h>, so it serves both as the `blas` capability provider for Eigen and as a standalone BLAS. CN mirror: gitcode mcpp-res/openblas (sha256-verified). compat.eigen gains a `backend-openblas` feature: `implies use_blas` (defines EIGEN_USE_BLAS + requires the `blas` capability) and pulls compat.openblas as a feature-dep. The resolver binds the single `blas` provider automatically and the provider's -lopenblas links. Requires mcpp >= 0.0.72: EIGEN_USE_BLAS is an interface define that must reach the consumer's TUs (Eigen is header-only); interface-define propagation landed in 0.0.72. Validated end-to-end: a consumer of compat.eigen[backend-openblas] builds, links libopenblas.a, pulls OpenBLAS dgemm_ (not Eigen's built-in GEMM), and runs.
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Summary
Adds compat.openblas and wires Eigen's backend-openblas feature, completing the feature/capability closed loop (requires mcpp >= 0.0.72).
compat.openblas (new)
install()hook (build-depxim:make):make TARGET=GENERIC NO_FORTRAN=1 NO_LAPACK=1 NO_SHARED=1 USE_THREAD=0 USE_OPENMP=0 CC=gcc libs→libopenblas.a. BLAS-only (LAPACK needs Fortran); portable C kernels; static.provides = ["blas"],ldflags = ["-Llib", "-lopenblas"], exposes<cblas.h>— usable both as theblascapability provider for Eigen and as a standalone BLAS.install()(notgenerated_files), which is what makes mcpp run the hook before the build — same trigger as compat.xcb's generatedxproto.c.mcpp-res/openblasrelease 0.3.33 (sha256-verified, byte-matched).compat.eigen — backend-openblas feature
implies use_blas(definesEIGEN_USE_BLAS+requires "blas") and pullscompat.openblasas a feature-dep. The resolver binds the singleblasprovider;-lopenblaslinks automatically.Requires mcpp >= 0.0.72
EIGEN_USE_BLASis an interface define that must reach the consumer's TUs (Eigen is header-only) — interface-define propagation landed in mcpp 0.0.72.Validation
A consumer of
compat.eigen[backend-openblas]builds, linkslibopenblas.a, pulls OpenBLASdgemm_(21 symbols — not Eigen's built-in GEMM), and runs (trace/sumoutput).