Cmake/add option for fujitsu compiler (#11839)

* cmake: change c++ spec when building with Fujitsu compiler.

* cmake: define cxxflags using a Fujitsu compiler's method.

* cmake: Add condition of whether to add cxx11 option.

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

@@ -110,6 +110,12 @@ class Cmake(Package):
 
     phases = ['bootstrap', 'build', 'install']
 
+    def setup_environment(self, spack_env, run_env):
+        if self.compiler.name == 'fj' \
+                and self.compiler.cxx11_flag \
+                not in self.spec.compiler_flags['cxxflags']:
+            spack_env.append_flags('CXXFLAGS', self.compiler.cxx11_flag)
+
     def bootstrap_args(self):
         spec = self.spec
         args = [