MavenPackage: allow additional build args (#19676)

lib/spack/docs/build_systems/mavenpackage.rst

@@ -76,6 +76,24 @@ should add:
    depends_on('maven@3.5.4:', type='build')
 
 
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Passing arguments to the build phase
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The default build and install phases should be sufficient to install
+most packages. However, you may want to pass additional flags to
+the build phase. For example:
+
+.. code-block:: python
+
+   def build_args(self):
+       return [
+           '-Pdist,native',
+           '-Dtar',
+           '-Dmaven.javadoc.skip=true'
+       ]
+
+
 ^^^^^^^^^^^^^^^^^^^^^^
 External documentation
 ^^^^^^^^^^^^^^^^^^^^^^

lib/spack/spack/build_systems/maven.py

@@ -35,15 +35,19 @@ def build_directory(self):
         """The directory containing the ``pom.xml`` file."""
         return self.stage.source_path
 
+    def build_args(self):
+        """List of args to pass to build phase."""
+        return []
+
     def build(self, spec, prefix):
         """Compile code and package into a JAR file."""
 
         with working_dir(self.build_directory):
             mvn = which('mvn')
             if self.run_tests:
-                mvn('verify')
+                mvn('verify', *self.build_args())
             else:
-                mvn('package', '-DskipTests')
+                mvn('package', '-DskipTests', *self.build_args())
 
     def install(self, spec, prefix):
         """Copy to installation prefix."""