LBANN flags and OpenCV variant (#5951)

* Fixed the datatype flag in the LBANN package.
Fixed where the datatype flag should be set.

* Added variant to OpenCV to disable building DNN support

* Fixed a bug in how the elemental package tries to find its Fortran
library.  The current method does not work with Intel compilers.

* Added necessary paths for cuDNN and CUB.

* Addressed flake8 issues in Elemental package.

* Fixed several flake8 errors.  Added variant to build with or without
support for arbitrary-precision floating point arithmetic.

* Added the proper CMake flag when MPFR support is disabled.

* Fixed a bug in how the cudnn path was being set when there was no
cudnn requested.  Also requested that OpenCV is built without eigen
support.

* Fixed another bug where a dependency may not be there and thus should
not be always checked.

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

@@ -22,6 +22,7 @@
 # License along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ##############################################################################
+import os
 from spack import *
 from spack.spec import UnsupportedCompilerError
 
@@ -67,6 +68,9 @@ class Elemental(CMakePackage):
             values=('Debug', 'Release'))
     variant('blas', default='openblas', values=('openblas', 'mkl'),
             description='Enable the use of OpenBlas/MKL')
+    variant('mpfr', default=False,
+            description='Support GNU MPFR\'s'
+            'arbitrary-precision floating-point arithmetic')
 
     # Note that #1712 forces us to enumerate the different blas variants
     depends_on('blas', when='~openmp_blas ~int64_blas')
@@ -87,9 +91,9 @@ class Elemental(CMakePackage):
     depends_on('scalapack', when='+scalapack ~int64_blas')
     extends('python', when='+python')
     depends_on('python@:2.8', when='+python')
-    depends_on('gmp')
-    depends_on('mpc')
-    depends_on('mpfr')
+    depends_on('gmp', when='+mpfr')
+    depends_on('mpc', when='+mpfr')
+    depends_on('mpfr', when='+mpfr')
 
     patch('elemental_cublas.patch', when='+cublas')
     patch('cmake_0.87.7.patch', when='@0.87.7')
@@ -123,14 +127,23 @@ def cmake_args(self):
             '-DEL_DISABLE_PARMETIS:BOOL=%s'    % ('~parmetis' in spec),
             '-DEL_DISABLE_QUAD:BOOL=%s'        % ('~quad' in spec),
             '-DEL_USE_64BIT_INTS:BOOL=%s'      % ('+int64' in spec),
-            '-DEL_USE_64BIT_BLAS_INTS:BOOL=%s' % ('+int64_blas' in spec)]
+            '-DEL_USE_64BIT_BLAS_INTS:BOOL=%s' % ('+int64_blas' in spec),
+            '-DEL_DISABLE_MPFR:BOOL=%s'        % ('~mpfr' in spec)]
 
-        # see <stage_folder>/debian/rules as an example:
-        mpif77 = Executable(spec['mpi'].mpif77)
-        libgfortran = LibraryList(mpif77('--print-file-name',
-                                         'libgfortran.%s' % dso_suffix,
-                                         output=str))
-        args.append('-DGFORTRAN_LIB=%s' % libgfortran.libraries[0])
+        if self.spec.satisfies('%intel'):
+            ifort = env['SPACK_F77']
+            intel_bin = os.path.dirname(ifort)
+            intel_root = os.path.dirname(intel_bin)
+            libfortran = LibraryList('{0}/lib/intel64/libifcoremt.{1}'
+                                     .format(intel_root, dso_suffix))
+        elif self.spec.satisfies('%gcc'):
+            # see <stage_folder>/debian/rules as an example:
+            mpif77 = Executable(spec['mpi'].mpif77)
+            libfortran = LibraryList(mpif77('--print-file-name',
+                                            'libgfortran.%s' % dso_suffix,
+                                            output=str))
+        if libfortran:
+            args.append('-DGFORTRAN_LIB=%s' % libfortran.libraries[0])
 
         # If using 64bit int BLAS libraries, elemental has to build
         # them internally

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

@@ -48,9 +48,11 @@ class Lbann(CMakePackage):
     depends_on('elemental +openmp_blas +shared +int64 build_type=Debug', 
                when=('build_type=Debug'))
     depends_on('cuda', when='+gpu')
+    depends_on('cudnn', when='+gpu')
+    depends_on('cub', when='+gpu')
     depends_on('mpi')
     depends_on('hwloc')
-    depends_on('opencv@3.2.0: +openmp +core +highgui +imgproc +jpeg +png +tiff +zlib', when='+opencv')
+    depends_on('opencv@3.2.0: +openmp +core +highgui +imgproc +jpeg +png +tiff +zlib ~eigen', when='+opencv')
     depends_on('protobuf@3.0.2:')
     depends_on('cnpy')
 
@@ -83,4 +85,12 @@ def cmake_args(self):
             args.extend(['-DOpenCV_DIR:STRING={0}'.format(
                 spec['opencv'].prefix)])
 
+        if '+cudnn' in spec:
+            args.extend(['-DcuDNN_DIR={0}'.format(
+                spec['cudnn'].prefix)])
+
+        if '+cudnn' in spec:
+            args.extend(['-DCUB_DIR={0}'.format(
+                spec['cub'].prefix)])
+
         return args

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

@@ -75,6 +75,7 @@ class Opencv(CMakePackage):
     variant('png', default=False, description='Include PNG support')
     variant('tiff', default=False, description='Include TIFF support')
     variant('zlib', default=False, description='Build zlib from source')
+    variant('dnn', default=False, description='Build DNN support')
 
     depends_on('eigen~mpfr', when='+eigen', type='build')
 
@@ -90,7 +91,7 @@ class Opencv(CMakePackage):
     depends_on('qt', when='+qt')
     depends_on('java', when='+java')
     depends_on('py-numpy', when='+python', type=('build', 'run'))
-    depends_on('protobuf@3.1.0', when='@3.3.0:')
+    depends_on('protobuf@3.1.0', when='@3.3.0: +dnn')
 
     extends('python', when='+python')
 
@@ -127,6 +128,8 @@ def cmake_args(self):
                 'ON' if '+zlib' in spec else 'OFF')),
             '-DWITH_OPENMP:BOOL={0}'.format((
                 'ON' if '+openmp' in spec else 'OFF')),
+            '-DBUILD_opencv_dnn:BOOL={0}'.format((
+                'ON' if '+dnn' in spec else 'OFF')),
         ]
 
         # Media I/O