Add clang compiler (#15152)

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

@@ -45,6 +45,8 @@ def configure(self, spec, prefix):
             options.append('-pgCC')
         elif self.compiler.name == 'gcc':
             options.append('-GNU')
+        elif self.compiler.name == 'clang':
+            options.append('-clang')
         else:
             raise InstallError('Unknown/unsupported compiler family')