bugfix for target adjustments on target ranges (#20537)

(cherry picked from commit 61c1b71d38)

lib/spack/spack/concretize.py

@@ -578,10 +578,14 @@ def adjust_target(self, spec):
             True if spec was modified, False otherwise
         """
         # To minimize the impact on performance this function will attempt
-        # to adjust the target only at the very first call. It will just
-        # return False on subsequent calls. The way this is achieved is by
-        # initializing a generator and making this function return the next
-        # answer.
+        # to adjust the target only at the very first call once necessary
+        # information is set. It will just return False on subsequent calls.
+        # The way this is achieved is by initializing a generator and making
+        # this function return the next answer.
+        if not (spec.architecture and spec.architecture.concrete):
+            # Not ready, but keep going because we have work to do later
+            return True
+
         def _make_only_one_call(spec):
             yield self._adjust_target(spec)
             while True:
@@ -619,9 +623,10 @@ def _adjust_target(self, spec):
         if PackagePrefs.has_preferred_targets(spec.name):
             default_target = self.target_from_package_preferences(spec)
 
-        if current_target != default_target or \
-            (self.abstract_spec.architecture is not None and
-             self.abstract_spec.architecture.target is not None):
+        if current_target != default_target or (
+                self.abstract_spec and
+                self.abstract_spec.architecture and
+                self.abstract_spec.architecture.concrete):
             return False
 
         try:

lib/spack/spack/test/concretize.py

@@ -688,13 +688,14 @@ def test_noversion_pkg(self, spec):
         with pytest.raises(spack.error.SpackError):
             Spec(spec).concretized()
 
+    # Include targets to prevent regression on 20537
     @pytest.mark.parametrize('spec, best_achievable', [
-        ('mpileaks%gcc@4.4.7', 'core2'),
-        ('mpileaks%gcc@4.8', 'haswell'),
-        ('mpileaks%gcc@5.3.0', 'broadwell'),
-        ('mpileaks%apple-clang@5.1.0', 'x86_64')
+        ('mpileaks%gcc@4.4.7 target=x86_64:', 'core2'),
+        ('mpileaks%gcc@4.8 target=x86_64:', 'haswell'),
+        ('mpileaks%gcc@5.3.0 target=x86_64:', 'broadwell'),
+        ('mpileaks%apple-clang@5.1.0 target=x86_64:', 'x86_64')
     ])
-    @pytest.mark.regression('13361')
+    @pytest.mark.regression('13361', '20537')
     def test_adjusting_default_target_based_on_compiler(
             self, spec, best_achievable, current_host, mock_targets
     ):

lib/spack/spack/test/conftest.py

@@ -434,9 +434,8 @@ def load_json():
         with open(mock_uarch_json) as f:
             return json.load(f)
 
-    targets_json = archspec.cpu.schema.LazyDictionary(load_json)
-    targets = archspec.cpu.microarchitecture.LazyDictionary(
-        archspec.cpu.microarchitecture._known_microarchitectures)
+    targets_json = load_json()
+    targets = archspec.cpu.microarchitecture._known_microarchitectures()
 
     yield targets_json, targets