1 files changed, 66 insertions, 0 deletions
diff --git a/vcpkg/ports/blas/portfile.cmake b/vcpkg/ports/blas/portfile.cmake
new file mode 100644
index 0000000..12978ce
--- /dev/null
+++ b/vcpkg/ports/blas/portfile.cmake
@@ -0,0 +1,66 @@
+SET(VCPKG_POLICY_EMPTY_PACKAGE enabled)
+
+# Due to the interaction between BLAS and LAPACK, we need to choose implementations consistent with
+# each other.
+#
+# First, if we are on Apple, we use the Accelerate framework.
+#
+# Then, we prefer to use openblas and lapack-reference for blas and lapack, respectively, but
+# sometimes are unable.
+#
+# If we are on Windows and arm or uwp, that we use gfortran as our fortran compiler creates an issue
+# because there is no available libgfortran. This means we can't use lapack-reference at all.
+#
+# If we are on Windows and static, there is a linking problem caused by static gfortran in the same
+# link as openblas, so we have to use the blas implementation from lapack-reference.
+#
+# That results in roughly the following decision tree:
+#
+# no_libgfortran = (uwp || (windows && arm))
+# can_link_mixed_static_libgfortran = !windows || !static
+#
+# if (no_libgfortran) {
+#    return {
+#        "blas": "openblas",
+#        "lapack": "clapack"
+#     };
+# } else if (can_link_mixed_static_libgfortran) {
+#     return {
+#         "blas": "openblas",
+#         "lapack": "lapack-reference[noblas]"
+#     };
+# } else {
+#     return {
+#         "blas": "lapack-reference[blas]",
+#         "lapack": "lapack-reference[blas]"
+#     };
+# }
+#
+# Scoping this to just the 'can use openblas' question, we get:
+# uwp || (windows && arm) || !windows || !static
+# and for lapack-reference[blas], the DeMorgan'd inverse of that:
+# !uwp && !(windows && arm) && windows && static
+
+if(VCPKG_TARGET_IS_OSX OR VCPKG_TARGET_IS_IOS)
+    # Use Apple's accelerate framework where available
+    set(BLA_VENDOR Apple)
+    set(requires "")
+    set(libs "-framework Accelerate")
+    set(cflags "-framework Accelerate")
+else()
+    set(BLA_VENDOR OpenBLAS)
+    set(requires openblas)
+endif()
+
+configure_file("${CMAKE_CURRENT_LIST_DIR}/blas.pc.in" "${CURRENT_PACKAGES_DIR}/lib/pkgconfig/blas.pc" @ONLY)
+if(NOT VCPKG_BUILD_TYPE)
+    configure_file("${CMAKE_CURRENT_LIST_DIR}/blas.pc.in" "${CURRENT_PACKAGES_DIR}/debug/lib/pkgconfig/blas.pc" @ONLY)
+endif()
+
+if(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
+    set(BLA_STATIC ON)
+else()
+    set(BLA_STATIC OFF)
+endif()
+
+configure_file("${CMAKE_CURRENT_LIST_DIR}/vcpkg-cmake-wrapper.cmake.in" "${CURRENT_PACKAGES_DIR}/share/blas/vcpkg-cmake-wrapper.cmake" @ONLY)