Added pgi support for suite-sparse package (#4340)

* Added pgi support for suite-sparse package

* Patch modified

* added 'CFOPENMP={0}'.format(self.compiler.openmp_flag) for -mp flag

var/spack/repos/builtin/packages/suite-sparse/package.py

@@ -53,6 +53,9 @@ class SuiteSparse(Package):
 
     patch('tbb_453.patch', when='@4.5.3:+tbb')
 
+    # This patch removes unsupported flags for pgi compiler
+    patch('pgi.patch', when='%pgi')
+
     def install(self, spec, prefix):
         # The build system of SuiteSparse is quite old-fashioned.
         # It's basically a plain Makefile which include an header
@@ -74,7 +77,8 @@ def install(self, spec, prefix):
             'CUDA=no',
             'CUDA_PATH={0}'.format(
                 spec['cuda'].prefix if '+cuda' in spec else ''
-            )
+            ),
+            'CFOPENMP={0}'.format(self.compiler.openmp_flag)
         ])
 
         if '+pic' in spec:

var/spack/repos/builtin/packages/suite-sparse/pgi.patch

@@ -0,0 +1,12 @@
+--- a/SuiteSparse_config/SuiteSparse_config.mk
++++ b/SuiteSparse_config/SuiteSparse_config.mk
+@@ -89,7 +89,8 @@
+ 
+     # The CF macro is used by SuiteSparse Makefiles as a combination of
+     # CFLAGS, CPPFLAGS, TARGET_ARCH, and system-dependent settings.
+-    CF ?= $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) $(OPTIMIZATION) -fexceptions -fPIC
++    #CF ?= $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) $(OPTIMIZATION) -fexceptions -fPIC
++    CF ?= $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) $(OPTIMIZATION) -fPIC
+ 
+     #---------------------------------------------------------------------------
+     # OpenMP is used in CHOLMOD