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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

$NetBSD: patch-CMakeLists.txt,v 1.1 2020/10/12 21:51:57 bacon Exp $

Avoid installation of LAPACK CMake and pkg-config files when not installing
LAPACK, also allowing explicitly to switch off LAPACK build for BLAS-only
packaging.

--- CMakeLists.txt.orig	2020-03-03 15:36:43.155560348 +0100
+++ CMakeLists.txt	2020-03-03 15:36:34.827560837 +0100
@@ -112,8 +112,10 @@
 
 
 # --------------------------------------------------
-set(LAPACK_INSTALL_EXPORT_NAME lapack-targets)
 
+if(LAPACK)
+
+set(LAPACK_INSTALL_EXPORT_NAME lapack-targets)
 macro(lapack_install_library lib)
   install(TARGETS ${lib}
     EXPORT ${LAPACK_INSTALL_EXPORT_NAME}
@@ -123,6 +125,18 @@
   )
 endmacro()
 
+else()
+
+macro(lapack_install_library lib)
+  install(TARGETS ${lib}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT Development
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT RuntimeLibraries
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT RuntimeLibraries
+  )
+endmacro()
+
+endif()
+
 set(PKG_CONFIG_DIR ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
 
 # --------------------------------------------------
@@ -252,6 +266,10 @@
 
 option(USE_OPTIMIZED_LAPACK "Whether or not to use an optimized LAPACK library instead of included netlib LAPACK" OFF)
 
+option(LAPACK "Whether to build or use LAPACK (to enable a BLAS-only build)")
+
+if(LAPACK)
+
 # --------------------------------------------------
 # LAPACK
 # User did not provide a LAPACK Library but specified to search for one
@@ -293,6 +311,8 @@
     CACHE STRING "Linker flags for shared libs" FORCE)
 endif()
 
+endif()
+
 if(BUILD_TESTING)
   add_subdirectory(TESTING)
 endif()
@@ -374,14 +394,18 @@
   set(ALL_TARGETS ${ALL_TARGETS} blas)
 endif()
 
+if(LAPACK)
 if(NOT LATESTLAPACK_FOUND)
   set(ALL_TARGETS ${ALL_TARGETS} lapack)
+  set(BUILD_LAPACK ON)
+endif()
 endif()
 
 if(BUILD_TESTING OR LAPACKE_WITH_TMG)
   set(ALL_TARGETS ${ALL_TARGETS} tmglib)
 endif()
 
+if(LAPACK)
 # Export lapack targets, not including lapacke, from the
 # install tree, if any.
 set(_lapack_config_install_guard_target "")
@@ -395,6 +419,7 @@
   # lapack-config.cmake to load targets from the install tree.
   list(GET ALL_TARGETS 0 _lapack_config_install_guard_target)
 endif()
+endif()
 
 # Include cblas in targets exported from the build tree.
 if(CBLAS)
@@ -406,6 +431,7 @@
   set(ALL_TARGETS ${ALL_TARGETS} lapacke)
 endif()
 
+if(LAPACK)
 # Export lapack and lapacke targets from the build tree, if any.
 set(_lapack_config_build_guard_target "")
 if(ALL_TARGETS)
@@ -415,32 +441,34 @@
   # for lapack-config.cmake to load targets from the build tree.
   list(GET ALL_TARGETS 0 _lapack_config_build_guard_target)
 endif()
+endif()
 
-configure_file(${LAPACK_SOURCE_DIR}/CMAKE/lapack-config-build.cmake.in
-  ${LAPACK_BINARY_DIR}/lapack-config.cmake @ONLY)
-
+if(BUILD_LAPACK)
+  configure_file(${LAPACK_SOURCE_DIR}/CMAKE/lapack-config-build.cmake.in
+    ${LAPACK_BINARY_DIR}/lapack-config.cmake @ONLY)
 
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/lapack.pc.in ${CMAKE_CURRENT_BINARY_DIR}/lapack.pc @ONLY)
+  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/lapack.pc.in ${CMAKE_CURRENT_BINARY_DIR}/lapack.pc @ONLY)
   install(FILES
-  ${CMAKE_CURRENT_BINARY_DIR}/lapack.pc
-  DESTINATION ${PKG_CONFIG_DIR}
-  COMPONENT Development
-  )
+    ${CMAKE_CURRENT_BINARY_DIR}/lapack.pc
+    DESTINATION ${PKG_CONFIG_DIR}
+    COMPONENT Development
+    )
 
-configure_file(${LAPACK_SOURCE_DIR}/CMAKE/lapack-config-install.cmake.in
-  ${LAPACK_BINARY_DIR}/CMakeFiles/lapack-config.cmake @ONLY)
+  configure_file(${LAPACK_SOURCE_DIR}/CMAKE/lapack-config-install.cmake.in
+    ${LAPACK_BINARY_DIR}/CMakeFiles/lapack-config.cmake @ONLY)
 
-include(CMakePackageConfigHelpers)
-write_basic_package_version_file(
-  ${LAPACK_BINARY_DIR}/lapack-config-version.cmake
-  VERSION ${LAPACK_VERSION}
-  COMPATIBILITY SameMajorVersion
-  )
+  include(CMakePackageConfigHelpers)
+  write_basic_package_version_file(
+    ${LAPACK_BINARY_DIR}/lapack-config-version.cmake
+    VERSION ${LAPACK_VERSION}
+    COMPATIBILITY SameMajorVersion
+    )
 
-install(FILES
-  ${LAPACK_BINARY_DIR}/CMakeFiles/lapack-config.cmake
-  ${LAPACK_BINARY_DIR}/lapack-config-version.cmake
-  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/lapack-${LAPACK_VERSION}
-  COMPONENT Development
-  )
-  
\ Kein Zeilenumbruch am Dateiende.
+  install(FILES
+    ${LAPACK_BINARY_DIR}/CMakeFiles/lapack-config.cmake
+    ${LAPACK_BINARY_DIR}/lapack-config-version.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/lapack-${LAPACK_VERSION}
+    COMPONENT Development
+    )
+endif()
+