bugfix: associate nodes directly with specs for compiler flag reordering (#48496)

lib/spack/spack/solver/asp.py

@@ -3540,15 +3540,13 @@ def reorder_flags(self):
         )
         cmd_specs = dict((s.name, s) for spec in self._command_line_specs for s in spec.traverse())
 
-        for spec in self._specs.values():
+        for node, spec in self._specs.items():
             # if bootstrapping, compiler is not in config and has no flags
             flagmap_from_compiler = {}
             if spec.compiler in compilers:
                 flagmap_from_compiler = compilers[spec.compiler].flags
 
             for flag_type in spec.compiler_flags.valid_compiler_flags():
-                node = SpecBuilder.make_node(pkg=spec.name)
-
                 ordered_flags = []
 
                 # 1. Put compiler flags first

lib/spack/spack/test/concretization/flag_mixing.py

@@ -5,6 +5,7 @@
 
 import pytest
 
+import spack.concretize
 import spack.config
 import spack.environment as ev
 import spack.paths
@@ -96,6 +97,18 @@ def test_mix_spec_and_compiler_cfg(concretize_scope, test_repo):
     assert s1.satisfies('cflags="-Wall -O2"')
 
 
+def test_pkg_flags_from_compiler_and_none(concretize_scope, mock_packages):
+    conf_str = _compiler_cfg_one_entry_with_cflags("-Wall")
+    update_concretize_scope(conf_str, "compilers")
+
+    s1 = Spec("cmake%gcc@12.100.100")
+    s2 = Spec("cmake-client^cmake%clang")
+    concrete = dict(spack.concretize.concretize_together([(s1, None), (s2, None)]))
+
+    assert concrete[s1].compiler_flags["cflags"] == ["-Wall"]
+    assert concrete[s2].compiler_flags["cflags"] == []
+
+
 @pytest.mark.parametrize(
     "cmd_flags,req_flags,cmp_flags,dflags,expected_order",
     [