math/blas, math/lapack: Install interchangeable BLAS system

Install the new interchangeable BLAS system created by Thomas Orgis,
currently supporting Netlib BLAS/LAPACK, OpenBLAS, cblas, lapacke, and
Apple's Accelerate.framework.  This system allows the user to select any
BLAS implementation without modifying packages or using package options, by
setting PKGSRC_BLAS_TYPES in mk.conf. See mk/blas.buildlink3.mk for details.

This commit should not alter behavior of existing packages as the system
defaults to Netlib BLAS/LAPACK, which until now has been the only supported
implementation.

Details:

Add new mk/blas.buildlink3.mk for inclusion in dependent packages
Install compatible Netlib math/blas and math/lapack packages
Update math/blas and math/lapack MAINTAINER approved by adam@
OpenBLAS, cblas, and lapacke will follow in separate commits
Update direct dependents to use mk/blas.buildlink3.mk
Perform recursive revbump

1 files changed, 108 insertions, 0 deletions

diff --git a/mk/blas.buildlink3.mk b/mk/blas.buildlink3.mk
new file mode 100644
index 00000000000..92ffa0a3c08
--- /dev/null
+++ b/mk/blas.buildlink3.mk
@@ -0,0 +1,108 @@
+# $NetBSD: blas.buildlink3.mk,v 1.1 2020/10/12 21:51:57 bacon Exp $
+#
+# This Makefile fragment is meant to be included by packages that use any BLAS
+# (Basic Linear Algebra System) implementation instead of one particular one.
+#
+# Since pkgsrc always ships BLAS and LAPACK together (as upstream
+# implementations do), this adds both BLAS_LIBS and LAPACK_LIBS to the linker
+# flags.  Often, they will be identical or at least redundant. It is a matter
+# of style to stay consistent in their use.
+#
+# Keywords: blas lapack atlas openblas mkl
+#
+# === User-settable variables ===
+#
+# PKGSRC_BLAS_TYPES
+#  This value specifies an exhaustive list of BLAS implementations we wish to
+#  use in this pkgsrc installation, in descending order of preference.
+#  The implementation selected for a build will be the first one in
+#  PKGSRC_BLAS_TYPES that also appears in BLAS_ACCEPTED (see below).
+#  Typically set in mk.conf.
+#
+#  Possible: one or more of netlib, openblas, openblas_pthread,
+#    openblas_openmp, and Apple's accelerate.framework
+#    (to come: Intel MKL, other external optimized builds)
+#
+#  Default: All currently supported implementations (${_BLAS_TYPES})
+#
+# === Package-settable variables ===
+#
+# BLAS_ACCEPTED
+#   This is a list of blas packages that are compatible with the current
+#   package. If not set, any BLAS implementation is OK.
+#   Typically set in package Makefile.
+#
+# === Variables automatically set here for use in package builds ===
+# 
+# BLAS_TYPE
+#   This is the BLAS implementation chosen for a particular package build from
+#   PKGSRC_BLAS_TYPES and BLAS_ACCEPTED.  If PKGSRC_BLAS_TYPES and
+#   BLAS_ACCEPTED have no implementations in common, it defaults to none
+#   and the build fails.
+# BLAS_LIBS
+#   Linker flags used for linking to BLAS library
+# LAPACK_LIBS
+#   Linker flags used for linking to LAPACK library
+
+.if !defined(MK_BLAS_BUILDLINK3_MK)
+MK_BLAS_BUILDLINK3_MK=
+
+BUILD_DEFS+=		PKGSRC_BLAS_TYPES
+BUILD_DEFS_EFFECTS+=	BLAS_TYPE BLAS_LIBS LAPACK_LIBS
+
+# TODO: Upon commit change to: .include "bsd.prefs.mk"
+.include "../../mk/bsd.prefs.mk"
+
+# List of all possible BLAS choices, in order of *DEFAULT* preference.
+# netlib is the reference implementation to which all others conform and
+# should come first by default for maximum compatibility.  It is also the
+# slowest and not desirable in many situations.  Users can override by setting
+# PKGSRC_BLAS_TYPES. (See comment above)
+_BLAS_TYPES=	netlib openblas openblas_pthread openblas_openmp
+# Darwin
+.if exists(/System/Library/Frameworks/Accelerate.framework)
+_BLAS_TYPES+=	accelerate.framework
+.endif
+
+BLAS_ACCEPTED?=	${_BLAS_TYPES}
+PKGSRC_BLAS_TYPES?= ${_BLAS_TYPES}
+
+_BLAS_MATCH=
+.for b in ${PKGSRC_BLAS_TYPES}
+_BLAS_MATCH+=	${BLAS_ACCEPTED:M${b}}
+.endfor
+.if !empty(_BLAS_MATCH)
+BLAS_TYPE=	${_BLAS_MATCH:[1]}
+.else
+BLAS_TYPE=	none
+.endif
+
+.if ${BLAS_TYPE} == "netlib"
+_BLAS_PKGPATH=	math/lapack
+BLAS_LIBS=	-lblas
+LAPACK_LIBS=	-llapack ${BLAS_LIBS}
+.elif ${BLAS_TYPE} == "openblas"
+_BLAS_PKGPATH=	math/openblas
+BLAS_LIBS=	-lopenblas
+LAPACK_LIBS=	${BLAS_LIBS}
+.elif ${BLAS_TYPE} == "openblas_pthread"
+_BLAS_PKGPATH=	math/openblas_pthread
+BLAS_LIBS=	-lopenblas_pthread
+LAPACK_LIBS=	${BLAS_LIBS}
+.elif ${BLAS_TYPE} == "openblas_openmp"
+_BLAS_PKGPATH=	math/openblas_openmp
+BLAS_LIBS=	-lopenblas_openmp
+LAPACK_LIBS=	${BLAS_LIBS}
+.elif ${BLAS_TYPE} == "accelerate.framework"
+BLAS_LIBS=	-framework Accelerate
+LAPACK_LIBS=	${BLAS_LIBS}
+.else # invalid or unimplemented type
+PKG_FAIL_REASON+=	\
+	"There is no acceptable BLAS for ${PKGNAME} in: ${PKGSRC_BLAS_TYPES}."
+.endif
+
+.if defined(_BLAS_PKGPATH)
+.include "../../${_BLAS_PKGPATH}/buildlink3.mk"
+.endif
+
+.endif # BLAS_BUILDLINK3_MK