oce changes for cgm (#4514)

* oce changes for cgm

cgm can be configured with oce, but oce needs
to have X11 enabled, because some libraries
(like TKCAF in occ/oce) gets built only of X11 is NOT disabled
so introduce a variant +X11 for oce, which is needed when
configuring cgm with oce(+X11)

* follow up review

simplify by removing the patch and different url paths
use append instead of extend, when necessary
make mpi true by default

X11 dependency is still to be addressed; it pulls in some opengl
library (on laptop nvidia seem to work, on virtual linux machine
mesa was good enough)

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

@@ -25,30 +25,40 @@
 from spack import *
 
 
-class Cgm(Package):
+class Cgm(AutotoolsPackage):
     """The Common Geometry Module, Argonne (CGMA) is a code library
        which provides geometry functionality used for mesh generation and
        other applications."""
-    homepage = "http://trac.mcs.anl.gov/projects/ITAPS/wiki/CGM"
-    url      = "http://ftp.mcs.anl.gov/pub/fathom/cgm13.1.1.tar.gz"
+    homepage = "http://sigma.mcs.anl.gov/cgm-library"         
+    url = "http://ftp.mcs.anl.gov/pub/fathom/cgm-16.0.tar.gz"
 
+    version('16.0', 'a68aa5954d82502ff75d5eb91a29a01c')
     version('13.1.1', '4e8dbc4ba8f65767b29f985f7a23b01f')
     version('13.1.0', 'a6c7b22660f164ce893fb974f9cb2028')
     version('13.1', '95f724bda04919fc76818a5b7bc0b4ed')
 
-    depends_on("mpi")
+    variant("mpi", default=True, description='enable mpi support')
+    variant("oce", default=False, description='enable oce geometry kernel')
 
-    def patch(self):
-        filter_file('^(#include "CGMParallelConventions.h")',
-                    '//\1',
-                    'geom/parallel/CGMReadParallel.cpp')
+    depends_on('mpi', when='+mpi')
+    depends_on('oce+X11', when='+oce')
 
-    def install(self, spec, prefix):
-        configure("--with-mpi",
-                  "--prefix=%s" % prefix,
-                  "CFLAGS=-static",
-                  "CXXFLAGS=-static",
-                  "FCFLAGS=-static")
+    def configure_args(self):
+        spec = self.spec
+        args = []
 
-        make()
-        make("install")
+        if '+mpi' in spec:
+            args.extend([
+                "--with-mpi",
+                "CC={0}".format(spec['mpi'].mpicc),
+                "CXX={0}".format(spec['mpi'].mpicxx)
+            ])
+        else:
+            args.append("--without-mpi")
+
+        if '+oce' in spec:
+            args.append("--with-occ={0}".format(spec['oce'].prefix))
+        else:
+            args.append("--without-occ")
+
+        return args

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

@@ -32,7 +32,7 @@ class Oce(Package):
     Open CASCADE library.
     """
     homepage = "https://github.com/tpaviot/oce"
-    url      = "https://github.com/tpaviot/oce/archive/OCE-0.18.tar.gz"
+    url = "https://github.com/tpaviot/oce/archive/OCE-0.18.tar.gz"
 
     version('0.18.1', '2a7597f4243ee1f03245aeeb02d00956')
     version('0.18',   '226e45e77c16a4a6e127c71fefcd171410703960ae75c7ecc7eb68895446a993')
@@ -44,6 +44,8 @@ class Oce(Package):
 
     variant('tbb', default=True,
             description='Build with Intel Threading Building Blocks')
+    variant('X11', default=False,
+            description='Build with X11 enabled')
 
     depends_on('cmake@2.8:', type='build')
     depends_on('tbb', when='+tbb')
@@ -70,7 +72,8 @@ def install(self, spec, prefix):
             '-DOCE_BUILD_SHARED_LIB:BOOL=ON',
             '-DCMAKE_BUILD_TYPE:STRING=Release',
             '-DOCE_DATAEXCHANGE:BOOL=ON',
-            '-DOCE_DISABLE_X11:BOOL=ON',
+            '-DOCE_DISABLE_X11:BOOL=%s' % (
+                'OFF' if '+X11' in spec else 'ON'),
             '-DOCE_DRAW:BOOL=OFF',
             '-DOCE_MODEL:BOOL=ON',
             '-DOCE_MULTITHREAD_LIBRARY:STRING=%s' % (