mk/blas.buildlink3.mk: added central BLAS+LAPACK choice

[Dr. Thomas Orgis <thomas.orgis%uni-hamburg.de@localhost>]

Module Name:	pkgsrc-wip
Committed By:	Dr. Thomas Orgis <thomas.orgis%uni-hamburg.de@localhost>
Pushed By:	thor
Date:		Tue Mar 26 15:25:10 2019 +0100
Changeset:	c21602fc004f99b56d4c9f15d0d8de6dd5b3952c

Added Files:
	mk/blas.buildlink3.mk

Log Message:
mk/blas.buildlink3.mk: added central BLAS+LAPACK choice

To see a diff of this commit:
https://wip.pkgsrc.org/cgi-bin/gitweb.cgi?p=pkgsrc-wip.git;a=commitdiff;h=c21602fc004f99b56d4c9f15d0d8de6dd5b3952c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

diffstat:
 mk/blas.buildlink3.mk | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diffs:
diff --git a/mk/blas.buildlink3.mk b/mk/blas.buildlink3.mk
new file mode 100644
index 0000000000..c4237aa1c3
--- /dev/null
+++ b/mk/blas.buildlink3.mk
@@ -0,0 +1,75 @@
+# $NetBSD$
+#
+# This Makefile fragment is meant to be included by packages
+# that use any BLAS implementation instead of one particular one.
+#
+# Since we always ship BLAS and LAPACK together (as upstream variants
+# do), this sets both BLAS_LIBS to the linker flags needed to pull in
+# the BLAS library and LAPACK_LIBS to the flags for the LAPACK library.
+# Often, they will be identical or at least redundant. It is a matter
+# of style to stay consistent in their use.
+
+# TODO: Also set a variable to find a matching pkg-config file
+# to avoid duplicating its contents in BLAS_LIBS?
+#
+# === User-settable variables ===
+#
+# BLAS_TYPE
+#	This value represents the type of BLAS we wish to use on the system.
+#
+#	Possible: netlib, openblas, openblas_pthread, openblas_openmp
+#	Default: netlib
+#
+# === Per-package variables ===
+#
+# BLAS_ACCEPTED
+#       This is a list of blas packages that are compatible with the current
+#       package. If not set, any package is OK.
+
+.if !defined(BLAS_BUILDLINK3_MK)
+BLAS_BUILDLINK3_MK=	# define it
+
+.include "../../mk/bsd.prefs.mk"
+
+# List of all possible BLAS choices.
+_BLAS_TYPES=	netlib openblas openblas_pthread openblas_openmp
+# Currently chosen type.
+# Default is the standard, slow, easily available.
+BLAS_TYPE?=	netlib
+BLAS_LIBS=
+BLAS_ACCEPTED?= ${_BLAS_TYPES}
+
+.  if !empty(BLAS_ACCEPTED:M${BLAS_TYPE})
+_BLAS_TYPE=     ${BLAS_TYPE}
+.  else
+_BLAS_TYPE=     none
+.  endif
+
+.if $(_BLAS_TYPE) == "netlib"
+_BLAS_PACKAGE=	wip/lapack-ng
+BLAS_LIBS=	-lblas
+LAPACK_LIBS=	-llapack ${BLAS_LIBS}
+.elif $(_BLAS_TYPE) == "openblas"
+_BLAS_PACKAGE=	wip/openblas
+BLAS_LIBS=	-lopenblas
+LAPACK_LIBS=	${BLAS_LIBS}
+.elif $(_BLAS_TYPE) == "openblas_pthread"
+_BLAS_PACKAGE=	wip/openblas_pthread
+BLAS_LIBS=	-lopenblas_pthread
+LAPACK_LIBS=	${BLAS_LIBS}
+.elif $(_BLAS_TYPE) == "openblas_openmp"
+_BLAS_PACKAGE=	wip/openblas_openmp
+BLAS_LIBS=	-lopenblas_openmp
+LAPACK_LIBS=	${BLAS_LIBS}
+# TODO: atlas
+# TODO: external BLAS (other OpenBLAS/ATLAS, Intel MKL)
+.else # invalid or unimplemented type
+PKG_FAIL_REASON+=	\
+	"${BLAS_TYPE} is not an acceptable BLAS type for ${PKGNAME}."
+.endif
+
+.if defined(_BLAS_PACKAGE)
+.include "../../${_BLAS_PACKAGE}/buildlink3.mk"
+.endif
+
+.endif	# BLAS_BUILDLINK3_MK