mkl: add provide blas/lapack

var/spack/repos/builtin/packages/mkl/package.py

@@ -18,6 +18,11 @@ class Mkl(IntelInstaller):
     version('11.3.3.210', 'f72546df27f5ebb0941b5d21fd804e34',
             url="file://%s/l_mkl_11.3.3.210.tgz" % os.getcwd())
 
+    # virtual dependency
+    provides('blas')
+    provides('lapack')
+    # TODO: MKL also provides implementation of Scalapack.
+
     def install(self, spec, prefix):
 
         self.intel_prefix = os.path.join(prefix, "pkg")
@@ -26,3 +31,21 @@ def install(self, spec, prefix):
         mkl_dir = os.path.join(self.intel_prefix, "mkl")
         for f in os.listdir(mkl_dir):
             os.symlink(os.path.join(mkl_dir, f), os.path.join(self.prefix, f))
+
+    def setup_dependent_package(self, module, dspec):
+        # For now use Single Dynamic Library:
+        # To set the threading layer at run time, use the
+        # mkl_set_threading_layer function or set MKL_THREADING_LAYER
+        # variable to one of the following values: INTEL, SEQUENTIAL, PGI.
+        # To set interface layer at run time, use the mkl_set_interface_layer
+        # function or set the MKL_INTERFACE_LAYER variable to LP64 or ILP64.
+
+        # Otherwise one would need to specify several libraries
+        # (e.g. mkl_intel_lp64;mkl_sequential;mkl_core), which reflect
+        # different interface and threading layers.
+
+        name = 'libmkl_rt.%s' % dso_suffix
+        libdir = find_library_path(name, self.prefix.lib64, self.prefix.lib)
+
+        self.spec.blas_shared_lib   = join_path(libdir, name)
+        self.spec.lapack_shared_lib = self.spec.blas_shared_lib