Bootstrap environment modules optimizing for generic architectures (#13105)

fixes #13073

Since #3206 was merged bootstrapping environment-modules was using the architecture of the current host or the best match supported by the default compiler. The former case is an issue since shell integration was looking for a spec targeted at the host microarchitecture.

1. Bootstrap an env modules targeted at generic architectures
2. Look for generic targets in shell integration scripts
3. Add a new entry in Travis to test shell integration

lib/spack/spack/cmd/bootstrap.py

@@ -3,6 +3,7 @@
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
+import llnl.util.cpu
 import llnl.util.tty as tty
 
 import spack.repo
@@ -56,7 +57,12 @@ def bootstrap(parser, args, **kwargs):
     # Define requirement dictionary defining general specs which need
     # to be satisfied, and the specs to install when the general spec
     # isn't satisfied.
-    requirement_dict = {'environment-modules': 'environment-modules~X'}
+    requirement_dict = {
+        # Install environment-modules with generic optimizations
+        'environment-modules': 'environment-modules~X target={0}'.format(
+            llnl.util.cpu.host().family
+        )
+    }
 
     for requirement in requirement_dict:
         installed_specs = spack.store.db.query(requirement)

lib/spack/spack/main.py

@@ -20,6 +20,7 @@
 import warnings
 from six import StringIO
 
+import llnl.util.cpu
 import llnl.util.tty as tty
 import llnl.util.tty.color as color
 from llnl.util.tty.log import log_output
@@ -621,8 +622,9 @@ def shell_set(var, value):
     # print environment module system if available. This can be expensive
     # on clusters, so skip it if not needed.
     if 'modules' in info:
-        specs = spack.store.db.query(
-            'environment-modules arch=%s' % spack.architecture.sys_type())
+        generic_arch = llnl.util.cpu.host().family
+        module_spec = 'environment-modules target={0}'.format(generic_arch)
+        specs = spack.store.db.query(module_spec)
         if specs:
             shell_set('_sp_module_prefix', specs[-1].prefix)
         else: