Better blas/lapack and scipy packages: more robust, added shared variants.

- py-scipy now builds with netlib-lapack, openblas, and atlas.
- started a convention for passing lib info from blas/lapack implementations.

- Improved netlib-lapack:
  - Also build static libs when `shared` variant is enabled.
  - Enable CBLAS  build
    - needed minor patch to build correctly.

- Added `shared` variant to OpenBLAS.
  - Made OpenBLAS build properly shared and static.

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

@@ -1,5 +1,6 @@
 from spack import *
 import sys
+import os
 
 class Openblas(Package):
     """OpenBLAS: An optimized BLAS library"""
@@ -10,29 +11,60 @@ class Openblas(Package):
     version('0.2.16', 'fef46ab92463bdbb1479dcec594ef6dc')
     version('0.2.15', 'b1190f3d3471685f17cfd1ec1d252ac9')
 
+    variant('shared', default=True, description="Build shared libraries as well as static libs.")
+
     # virtual dependency
     provides('blas')
     provides('lapack')
 
+
     def install(self, spec, prefix):
-        extra=[]
+        make_defs = ['CC=%s' % spack_cc,
+                     'FC=%s' % spack_fc]
+
+        make_targets = ['libs', 'netlib']
+
+        # Build shared if variant is set.
+        if '+shared' in spec:
+            make_targets += ['shared']
+        else:
+            make_defs += ['NO_SHARED=1']
+
+        # fix missing _dggsvd_ and _sggsvd_
         if spec.satisfies('@0.2.16'):
-            extra.extend([
-                'BUILD_LAPACK_DEPRECATED=1' # fix missing _dggsvd_ and _sggsvd_
-            ])
+            make_defs += ['BUILD_LAPACK_DEPRECATED=1']
 
-        make('libs', 'netlib', 'shared', 'CC=cc', 'FC=f77',*extra)
-        make("tests")
-        make('install', "PREFIX='%s'" % prefix)
+        make_args = make_defs + make_targets
+        make(*make_args)
+
+        make("tests", *make_defs)
+
+        # no quotes around prefix (spack doesn't use a shell)
+        make('install', "PREFIX=%s" % prefix, *make_defs)
 
-        lib_dsuffix = 'dylib' if sys.platform == 'darwin' else 'so'
         # Blas virtual package should provide blas.a and libblas.a
         with working_dir(prefix.lib):
             symlink('libopenblas.a', 'blas.a')
             symlink('libopenblas.a', 'libblas.a')
-            symlink('libopenblas.%s' % lib_dsuffix, 'libblas.%s' % lib_dsuffix)
+            if '+shared' in spec:
+                symlink('libopenblas.%s' % dso_suffix, 'libblas.%s' % dso_suffix)
 
         # Lapack virtual package should provide liblapack.a
         with working_dir(prefix.lib):
             symlink('libopenblas.a', 'liblapack.a')
-            symlink('libopenblas.%s' % lib_dsuffix, 'liblapack.%s' % lib_dsuffix)
+            if '+shared' in spec:
+                symlink('libopenblas.%s' % dso_suffix, 'liblapack.%s' % dso_suffix)
+
+
+    def setup_dependent_package(self, module, dspec):
+        # This is WIP for a prototype interface for virtual packages.
+        # We can update this as more builds start depending on BLAS/LAPACK.
+        libdir = find_library_path('libopenblas.a', self.prefix.lib64, self.prefix.lib)
+
+        self.spec.blas_static_lib   = join_path(libdir, 'libopenblas.a')
+        self.spec.lapack_static_lib = self.spec.blas_static_lib
+
+        if '+shared' in self.spec:
+            self.spec.blas_shared_lib   = join_path(libdir, 'libopenblas.%s' % dso_suffix)
+            self.spec.lapack_shared_lib = self.spec.blas_shared_lib
+