Unit tests: make unit tests work for aarch64 machines (#33625)

Currently, many tests hardcode to older versions of gcc for comparisons of
concretization among compiler versions. Those versions are too old to concretize for
`aarch64`-family targets, which leads to failing tests on `aarch64`.

This PR fixes those tests by updating the compiler versions used for testing.

Currently, many tests hardcode the expected architecture result in concretization to the
`x86_64` family of architectures.

This PR generalizes the tests that can be generalized, to cover multiple architecture
families. For those that test specific relationships among `x86_64`-family targets, it
ensures that concretization uses the `x86_64`-family targets in those cases.

Currently, many tests rely on the fact that `AutotoolsPackage` imposes no dependencies
on the inheriting package. That is not true on `aarch64`-family architectures.

This PR ensures that the fact `AutotoolsPackage` on `aarch64` pulls in a dependency on
`gnuconfig` is ignored when testing for the appropriate relationships among dependencies

Additionally, 5 tests currently prompt the user for input when `gpg` is available in the
user's path. This PR fixes that issue. And 7 tests fail currently when the user has a
yubikey available. This PR fixes the incorrect gpg argument causing those issues.

27 files changed, 347 insertions, 91 deletions

diff --git a/lib/spack/spack/compilers/__init__.py b/lib/spack/spack/compilers/__init__.py
index 1d61f37df7..05ffaf9f6c 100644
--- a/lib/spack/spack/compilers/__init__.py
+++ b/lib/spack/spack/compilers/__init__.py
@@ -346,6 +346,10 @@ def compilers_for_arch(arch_spec, scope=None):
     return list(get_compilers(config, arch_spec=arch_spec))
 
 
+def compiler_specs_for_arch(arch_spec, scope=None):
+    return [c.spec for c in compilers_for_arch(arch_spec, scope)]
+
+
 class CacheReference(object):
     """This acts as a hashable reference to any object (regardless of whether
     the object itself is hashable) and also prevents the object from being
diff --git a/lib/spack/spack/concretize.py b/lib/spack/spack/concretize.py
index 3fbc7e8bff..31066de026 100644
--- a/lib/spack/spack/concretize.py
+++ b/lib/spack/spack/concretize.py
@@ -734,7 +734,7 @@ def concretize_specs_together(*abstract_specs, **kwargs):
     Returns:
         List of concretized specs
     """
-    if spack.config.get("config:concretizer") == "original":
+    if spack.config.get("config:concretizer", "clingo") == "original":
         return _concretize_specs_together_original(*abstract_specs, **kwargs)
     return _concretize_specs_together_new(*abstract_specs, **kwargs)
 
diff --git a/lib/spack/spack/environment/environment.py b/lib/spack/spack/environment/environment.py
index 843cd5ff9c..1353b76b56 100644
--- a/lib/spack/spack/environment/environment.py
+++ b/lib/spack/spack/environment/environment.py
@@ -1376,7 +1376,7 @@ class Environment(object):
                 arguments.append((uspec_constraints, tests))
 
         # Ensure we don't try to bootstrap clingo in parallel
-        if spack.config.get("config:concretizer") == "clingo":
+        if spack.config.get("config:concretizer", "clingo") == "clingo":
             with spack.bootstrap.ensure_bootstrap_configuration():
                 spack.bootstrap.ensure_clingo_importable_or_raise()
 
diff --git a/lib/spack/spack/hooks/sbang.py b/lib/spack/spack/hooks/sbang.py
index 8731ef0c07..5d2de2b865 100644
--- a/lib/spack/spack/hooks/sbang.py
+++ b/lib/spack/spack/hooks/sbang.py
@@ -205,7 +205,9 @@ def install_sbang():
         fs.set_install_permissions(sbang_bin_dir)
 
     # set group on sbang_bin_dir if not already set (only if set in configuration)
-    if group_name and grp.getgrgid(os.stat(sbang_bin_dir).st_gid).gr_name != group_name:
+    # TODO: after we drop python2 support, use shutil.chown to avoid gid lookups that
+    # can fail for remote groups
+    if group_name and os.stat(sbang_bin_dir).st_gid != grp.getgrnam(group_name).gr_gid:
         os.chown(sbang_bin_dir, os.stat(sbang_bin_dir).st_uid, grp.getgrnam(group_name).gr_gid)
 
     # copy over the fresh copy of `sbang`
diff --git a/lib/spack/spack/platforms/test.py b/lib/spack/spack/platforms/test.py
index d181f2e926..26fe943394 100644
--- a/lib/spack/spack/platforms/test.py
+++ b/lib/spack/spack/platforms/test.py
@@ -16,9 +16,14 @@ class Test(Platform):
     if platform.system().lower() == "darwin":
         binary_formats = ["macho"]
 
-    front_end = "x86_64"
-    back_end = "core2"
-    default = "core2"
+    if platform.machine() == "arm64":
+        front_end = "aarch64"
+        back_end = "m1"
+        default = "m1"
+    else:
+        front_end = "x86_64"
+        back_end = "core2"
+        default = "core2"
 
     front_os = "redhat6"
     back_os = "debian6"
diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index 41bb7b57ee..10f6dfb8e9 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -2945,7 +2945,7 @@ class Spec(object):
                 if a list of names activate them for the packages in the list,
                 if True activate 'test' dependencies for all packages.
         """
-        if spack.config.get("config:concretizer") == "clingo":
+        if spack.config.get("config:concretizer", "clingo") == "clingo":
             self._new_concretize(tests)
         else:
             self._old_concretize(tests)
diff --git a/lib/spack/spack/test/architecture.py b/lib/spack/spack/test/architecture.py
index c357c650e8..746be0c8be 100644
--- a/lib/spack/spack/test/architecture.py
+++ b/lib/spack/spack/test/architecture.py
@@ -140,7 +140,7 @@ def test_optimization_flags(compiler_spec, target_name, expected_flags, config):
         (spack.spec.CompilerSpec("gcc@9.2.0"), None, "haswell", "-march=haswell -mtune=haswell"),
         # Check that custom string versions are accepted
         (
-            spack.spec.CompilerSpec("gcc@foo"),
+            spack.spec.CompilerSpec("gcc@10foo"),
             "9.2.0",
             "icelake",
             "-march=icelake-client -mtune=icelake-client",
@@ -196,7 +196,10 @@ def test_satisfy_strict_constraint_when_not_concrete(architecture_tuple, constra
     ],
 )
 @pytest.mark.usefixtures("mock_packages", "config")
-def test_concretize_target_ranges(root_target_range, dep_target_range, result):
+def test_concretize_target_ranges(root_target_range, dep_target_range, result, monkeypatch):
+    # Monkeypatch so that all concretization is done as if the machine is core2
+    monkeypatch.setattr(spack.platforms.test.Test, "default", "core2")
+
     # use foobar=bar to make the problem simpler for the old concretizer
     # the new concretizer should not need that help
     if spack.config.get("config:concretizer") == "original":
diff --git a/lib/spack/spack/test/build_systems.py b/lib/spack/spack/test/build_systems.py
index c4255eef49..03a920a28e 100644
--- a/lib/spack/spack/test/build_systems.py
+++ b/lib/spack/spack/test/build_systems.py
@@ -204,11 +204,12 @@ class TestAutotoolsPackage(object):
             assert "gnuconfig version of config.guess" not in f.read()
 
     @pytest.mark.disable_clean_stage_check
-    def test_autotools_gnuconfig_replacement_no_gnuconfig(self, mutable_database):
+    def test_autotools_gnuconfig_replacement_no_gnuconfig(self, mutable_database, monkeypatch):
         """
         Tests whether a useful error message is shown when patch_config_files is
         enabled, but gnuconfig is not listed as a direct build dependency.
         """
+        monkeypatch.setattr(spack.platforms.test.Test, "default", "x86_64")
         s = Spec("autotools-config-replacement +patch_config_files ~gnuconfig")
         s.concretize()
 
diff --git a/lib/spack/spack/test/cmd/ci.py b/lib/spack/spack/test/cmd/ci.py
index 117dec0ed4..5529defee5 100644
--- a/lib/spack/spack/test/cmd/ci.py
+++ b/lib/spack/spack/test/cmd/ci.py
@@ -190,6 +190,12 @@ spack:
           tags:
             - donotcare
           image: donotcare
+      - match:
+          - arch=test-debian6-m1
+        runner-attributes:
+          tags:
+            - donotcare
+          image: donotcare
     service-job-attributes:
       image: donotcare
       tags: [donotcare]
@@ -270,10 +276,10 @@ def test_ci_generate_bootstrap_gcc(
 spack:
   definitions:
     - bootstrap:
-      - gcc@3.0
-      - gcc@2.0
+      - gcc@9.5
+      - gcc@9.0
   specs:
-    - dyninst%gcc@3.0
+    - dyninst%gcc@9.5
   mirrors:
     some-mirror: https://my.fake.mirror
   gitlab-ci:
@@ -286,6 +292,11 @@ spack:
         runner-attributes:
           tags:
             - donotcare
+      - match:
+          - arch=test-debian6-aarch64
+        runner-attributes:
+          tags:
+            - donotcare
 """
         )
 
@@ -338,9 +349,9 @@ def test_ci_generate_bootstrap_artifacts_buildcache(
 spack:
   definitions:
     - bootstrap:
-      - gcc@3.0
+      - gcc@9.5
   specs:
-    - dyninst%gcc@3.0
+    - dyninst%gcc@9.5
   mirrors:
     some-mirror: https://my.fake.mirror
   gitlab-ci:
@@ -353,6 +364,11 @@ spack:
         runner-attributes:
           tags:
             - donotcare
+      - match:
+          - arch=test-debian6-aarch64
+        runner-attributes:
+          tags:
+            - donotcare
     enable-artifacts-buildcache: True
 """
         )
@@ -1524,12 +1540,12 @@ def test_ci_generate_with_workarounds(
             """\
 spack:
   specs:
-    - callpath%gcc@3.0
+    - callpath%gcc@9.5
   mirrors:
     some-mirror: https://my.fake.mirror
   gitlab-ci:
     mappings:
-      - match: ['%gcc@3.0']
+      - match: ['%gcc@9.5']
         runner-attributes:
           tags:
             - donotcare
@@ -1639,28 +1655,28 @@ def test_ci_generate_bootstrap_prune_dag(
     mirror_url = "file://{0}".format(mirror_dir.strpath)
 
     # Install a compiler, because we want to put it in a buildcache
-    install_cmd("gcc@10.1.0%gcc@4.5.0")
+    install_cmd("gcc@12.2.0%gcc@10.2.1")
 
     # Put installed compiler in the buildcache
-    buildcache_cmd("create", "-u", "-a", "-f", "-d", mirror_dir.strpath, "gcc@10.1.0%gcc@4.5.0")
+    buildcache_cmd("create", "-u", "-a", "-f", "-d", mirror_dir.strpath, "gcc@12.2.0%gcc@10.2.1")
 
     # Now uninstall the compiler
-    uninstall_cmd("-y", "gcc@10.1.0%gcc@4.5.0")
+    uninstall_cmd("-y", "gcc@12.2.0%gcc@10.2.1")
 
     monkeypatch.setattr(spack.concretize.Concretizer, "check_for_compiler_existence", False)
     spack.config.set("config:install_missing_compilers", True)
-    assert CompilerSpec("gcc@10.1.0") not in compilers.all_compiler_specs()
+    assert CompilerSpec("gcc@12.2.0") not in compilers.all_compiler_specs()
 
     # Configure the mirror where we put that buildcache w/ the compiler
     mirror_cmd("add", "test-mirror", mirror_url)
 
-    install_cmd("--no-check-signature", "a%gcc@10.1.0")
+    install_cmd("--no-check-signature", "b%gcc@12.2.0")
 
     # Put spec built with installed compiler in the buildcache
-    buildcache_cmd("create", "-u", "-a", "-f", "-d", mirror_dir.strpath, "a%gcc@10.1.0")
+    buildcache_cmd("create", "-u", "-a", "-f", "-d", mirror_dir.strpath, "b%gcc@12.2.0")
 
     # Now uninstall the spec
-    uninstall_cmd("-y", "a%gcc@10.1.0")
+    uninstall_cmd("-y", "b%gcc@12.2.0")
 
     filename = str(tmpdir.join("spack.yaml"))
     with open(filename, "w") as f:
@@ -1669,9 +1685,9 @@ def test_ci_generate_bootstrap_prune_dag(
 spack:
   definitions:
     - bootstrap:
-      - gcc@10.1.0%gcc@4.5.0
+      - gcc@12.2.0%gcc@10.2.1
   specs:
-    - a%gcc@10.1.0
+    - b%gcc@12.2.0
   mirrors:
     atestm: {0}
   gitlab-ci:
@@ -1689,6 +1705,16 @@ spack:
         runner-attributes:
           tags:
             - meh
+      - match:
+          - arch=test-debian6-aarch64
+        runner-attributes:
+          tags:
+            - donotcare
+      - match:
+          - arch=test-debian6-m1
+        runner-attributes:
+          tags:
+            - meh
 """.format(
                 mirror_url
             )
@@ -1746,10 +1772,6 @@ spack:
                 "(specs) b": [
                     "(bootstrap) gcc",
                 ],
-                "(specs) a": [
-                    "(bootstrap) gcc",
-                    "(specs) b",
-                ],
             }
 
             _validate_needs_graph(new_yaml_contents, needs_graph, False)
@@ -2152,7 +2174,10 @@ spack:
 
             ci_cmd("generate", "--output-file", pipeline_path, "--artifacts-root", artifacts_root)
 
-            job_name = ci.get_job_name("specs", False, job_spec, "test-debian6-core2", None)
+            target_name = spack.platforms.test.Test.default
+            job_name = ci.get_job_name(
+                "specs", False, job_spec, "test-debian6-%s" % target_name, None
+            )
 
             repro_file = os.path.join(working_dir.strpath, "repro.json")
             repro_details = {
diff --git a/lib/spack/spack/test/cmd/config.py b/lib/spack/spack/test/cmd/config.py
index cdf9bc00a0..e5ad82cf43 100644
--- a/lib/spack/spack/test/cmd/config.py
+++ b/lib/spack/spack/test/cmd/config.py
@@ -634,13 +634,13 @@ def test_config_prefer_upstream(
 
     # Make sure only the non-default variants are set.
     assert packages["boost"] == {
-        "compiler": ["gcc@4.5.0"],
+        "compiler": ["gcc@10.2.1"],
         "variants": "+debug +graph",
         "version": ["1.63.0"],
     }
-    assert packages["dependency-install"] == {"compiler": ["gcc@4.5.0"], "version": ["2.0"]}
+    assert packages["dependency-install"] == {"compiler": ["gcc@10.2.1"], "version": ["2.0"]}
     # Ensure that neither variant gets listed for hdf5, since they conflict
-    assert packages["hdf5"] == {"compiler": ["gcc@4.5.0"], "version": ["2.3"]}
+    assert packages["hdf5"] == {"compiler": ["gcc@10.2.1"], "version": ["2.3"]}
 
     # Make sure a message about the conflicting hdf5's was given.
     assert "- hdf5" in output
diff --git a/lib/spack/spack/test/cmd/find.py b/lib/spack/spack/test/cmd/find.py
index b313a36446..be83541096 100644
--- a/lib/spack/spack/test/cmd/find.py
+++ b/lib/spack/spack/test/cmd/find.py
@@ -322,7 +322,7 @@ def test_find_very_long(database, config):
 @pytest.mark.db
 def test_find_show_compiler(database, config):
     output = find("--no-groups", "--show-full-compiler", "mpileaks")
-    assert "mpileaks@2.3%gcc@4.5.0" in output
+    assert "mpileaks@2.3%gcc@10.2.1" in output
 
 
 @pytest.mark.db
diff --git a/lib/spack/spack/test/cmd/install.py b/lib/spack/spack/test/cmd/install.py
index 41de6565a1..843e539eea 100644
--- a/lib/spack/spack/test/cmd/install.py
+++ b/lib/spack/spack/test/cmd/install.py
@@ -935,7 +935,16 @@ def test_cdash_configure_warning(tmpdir, mock_fetch, install_mockery, capfd):
     with capfd.disabled():
         with tmpdir.as_cwd():
             # Test would fail if install raised an error.
-            install("--log-file=cdash_reports", "--log-format=cdash", "configure-warning")
+
+            # Ensure that even on non-x86_64 architectures, there are no
+            # dependencies installed
+            spec = spack.spec.Spec("configure-warning").concretized()
+            spec.clear_dependencies()
+            specfile = "./spec.json"
+            with open(specfile, "w") as f:
+                f.write(spec.to_json())
+
+            install("--log-file=cdash_reports", "--log-format=cdash", specfile)
             # Verify Configure.xml exists with expected contents.
             report_dir = tmpdir.join("cdash_reports")
             assert report_dir in tmpdir.listdir()
@@ -955,10 +964,10 @@ def test_compiler_bootstrap(
 ):
     monkeypatch.setattr(spack.concretize.Concretizer, "check_for_compiler_existence", False)
     spack.config.set("config:install_missing_compilers", True)
-    assert CompilerSpec("gcc@2.0") not in compilers.all_compiler_specs()
+    assert CompilerSpec("gcc@12.0") not in compilers.all_compiler_specs()
 
     # Test succeeds if it does not raise an error
-    install("a%gcc@2.0")
+    install("a%gcc@12.0")
 
 
 def test_compiler_bootstrap_from_binary_mirror(
@@ -1013,11 +1022,11 @@ def test_compiler_bootstrap_already_installed(
     monkeypatch.setattr(spack.concretize.Concretizer, "check_for_compiler_existence", False)
     spack.config.set("config:install_missing_compilers", True)
 
-    assert CompilerSpec("gcc@2.0") not in compilers.all_compiler_specs()
+    assert CompilerSpec("gcc@12.0") not in compilers.all_compiler_specs()
 
     # Test succeeds if it does not raise an error
-    install("gcc@2.0")
-    install("a%gcc@2.0")
+    install("gcc@12.0")
+    install("a%gcc@12.0")
 
 
 def test_install_fails_no_args(tmpdir):
diff --git a/lib/spack/spack/test/cmd/style.py b/lib/spack/spack/test/cmd/style.py
index 179973af52..fd727d088e 100644
--- a/lib/spack/spack/test/cmd/style.py
+++ b/lib/spack/spack/test/cmd/style.py
@@ -92,14 +92,14 @@ def test_changed_files_from_git_rev_base(tmpdir, capfd):
         git("checkout", "-b", "main")
         git("config", "user.name", "test user")
         git("config", "user.email", "test@user.com")
-        git("commit", "--allow-empty", "-m", "initial commit")
+        git("commit", "--no-gpg-sign", "--allow-empty", "-m", "initial commit")
 
         tmpdir.ensure("bin/spack")
         assert changed_files(base="HEAD") == ["bin/spack"]
         assert changed_files(base="main") == ["bin/spack"]
 
         git("add", "bin/spack")
-        git("commit", "-m", "v1")
+        git("commit", "--no-gpg-sign", "-m", "v1")
         assert changed_files(base="HEAD") == []
         assert changed_files(base="HEAD~") == ["bin/spack"]
 
@@ -113,7 +113,7 @@ def test_changed_no_base(tmpdir, capfd):
         git("config", "user.name", "test user")
         git("config", "user.email", "test@user.com")
         git("add", ".")
-        git("commit", "-m", "initial commit")
+        git("commit", "--no-gpg-sign", "-m", "initial commit")
 
         with pytest.raises(SystemExit):
             changed_files(base="foobar")
@@ -198,7 +198,7 @@ def external_style_root(flake8_package_with_errors, tmpdir):
         git("config", "user.name", "test user")
         git("config", "user.email", "test@user.com")
         git("add", ".")
-        git("commit", "-m", "initial commit")
+        git("commit", "--no-gpg-sign", "-m", "initial commit")
         git("branch", "-m", "develop")
         git("checkout", "-b", "feature")
 
@@ -210,7 +210,7 @@ def external_style_root(flake8_package_with_errors, tmpdir):
     # add the buggy file on the feature branch
     with tmpdir.as_cwd():
         git("add", str(py_file))
-        git("commit", "-m", "add new file")
+        git("commit", "--no-gpg-sign", "-m", "add new file")
 
     yield tmpdir, py_file
 
diff --git a/lib/spack/spack/test/concretize.py b/lib/spack/spack/test/concretize.py
index 9f380975ed..bf0110f3e6 100644
--- a/lib/spack/spack/test/concretize.py
+++ b/lib/spack/spack/test/concretize.py
@@ -313,8 +313,8 @@ class TestConcretize(object):
 
     def test_different_compilers_get_different_flags(self):
         client = Spec(
-            "cmake-client %gcc@4.7.2 platform=test os=fe target=fe"
-            + " ^cmake %clang@3.5 platform=test os=fe target=fe"
+            "cmake-client %gcc@11.1.0 platform=test os=fe target=fe"
+            + " ^cmake %clang@12.2.0 platform=test os=fe target=fe"
         )
         client.concretize()
         cmake = client["cmake"]
@@ -328,7 +328,7 @@ class TestConcretize(object):
         UnavailableCompilerVersionError if the architecture is concretized
         incorrectly.
         """
-        spec = Spec("cmake-client %gcc@4.7.2 os=fe ^ cmake")
+        spec = Spec("cmake-client %gcc@11.1.0 os=fe ^ cmake")
         spec.concretize()
         assert spec["cmake"].architecture == spec.architecture
 
@@ -452,7 +452,7 @@ class TestConcretize(object):
         spec.normalize()
         spec.concretize()
 
-    @pytest.mark.parametrize("compiler_str", ["clang", "gcc", "gcc@4.5.0", "clang@:3.3.0"])
+    @pytest.mark.parametrize("compiler_str", ["clang", "gcc", "gcc@10.2.1", "clang@:12.0.0"])
     def test_compiler_inheritance(self, compiler_str):
         spec_str = "mpileaks %{0}".format(compiler_str)
         spec = Spec(spec_str).concretized()
@@ -695,15 +695,15 @@ class TestConcretize(object):
     @pytest.mark.regression("8735,14730")
     def test_compiler_version_matches_any_entry_in_compilers_yaml(self):
         # Ensure that a concrete compiler with different compiler version
-        # doesn't match (here it's 4.5 vs. 4.5.0)
+        # doesn't match (here it's 10.2 vs. 10.2.1)
         with pytest.raises(spack.concretize.UnavailableCompilerVersionError):
-            s = Spec("mpileaks %gcc@4.5")
+            s = Spec("mpileaks %gcc@10.2")
             s.concretize()
 
         # An abstract compiler with a version list could resolve to 4.5.0
-        s = Spec("mpileaks %gcc@4.5:")
+        s = Spec("mpileaks %gcc@10.2:")
         s.concretize()
-        assert str(s.compiler.version) == "4.5.0"
+        assert str(s.compiler.version) == "10.2.1"
 
     def test_concretize_anonymous(self):
         with pytest.raises(spack.error.SpackError):
@@ -720,11 +720,11 @@ class TestConcretize(object):
         "spec_str,expected_str",
         [
             # Unconstrained versions select default compiler (gcc@4.5.0)
-            ("bowtie@1.3.0", "%gcc@4.5.0"),
+            ("bowtie@1.4.0", "%gcc@10.2.1"),
             # Version with conflicts and no valid gcc select another compiler
-            ("bowtie@1.2.2", "%clang@3.3"),
+            ("bowtie@1.3.0", "%clang@12.0.0"),
             # If a higher gcc is available still prefer that
-            ("bowtie@1.2.2 os=redhat6", "%gcc@4.7.2"),
+            ("bowtie@1.2.2 os=redhat6", "%gcc@11.1.0"),
         ],
     )
     def test_compiler_conflicts_in_package_py(self, spec_str, expected_str):
@@ -1047,11 +1047,11 @@ class TestConcretize(object):
         # that doesn't allow newer versions with gcc@4.4.0. Check
         # that an old version of openblas is selected, rather than
         # a different compiler for just that node.
-        spec_str = "simple-inheritance+openblas %gcc@4.4.0 os=redhat6"
+        spec_str = "simple-inheritance+openblas %gcc@10.1.0 os=redhat6"
         s = Spec(spec_str).concretized()
 
-        assert "openblas@0.2.13" in s
-        assert s["openblas"].satisfies("%gcc@4.4.0")
+        assert "openblas@0.2.15" in s
+        assert s["openblas"].satisfies("%gcc@10.1.0")
 
     @pytest.mark.regression("19981")
     def test_target_ranges_in_conflicts(self):
@@ -1080,8 +1080,8 @@ class TestConcretize(object):
         if spack.config.get("config:concretizer") == "original":
             pytest.xfail("Known failure of the original concretizer")
 
-        s = Spec("a %gcc@foo os=redhat6").concretized()
-        assert "%gcc@foo" in s
+        s = Spec("a %gcc@10foo os=redhat6").concretized()
+        assert "%gcc@10foo" in s
 
     def test_all_patches_applied(self):
         uuidpatch = (
@@ -1273,8 +1273,8 @@ class TestConcretize(object):
             ("mpileaks", "os=debian6"),
             # To trigger the bug in 22871 we need to have the same compiler
             # spec available on both operating systems
-            ("mpileaks%gcc@4.5.0 platform=test os=debian6", "os=debian6"),
-            ("mpileaks%gcc@4.5.0 platform=test os=redhat6", "os=redhat6"),
+            ("mpileaks%gcc@10.2.1 platform=test os=debian6", "os=debian6"),
+            ("mpileaks%gcc@10.2.1 platform=test os=redhat6", "os=redhat6"),
         ],
     )
     def test_os_selection_when_multiple_choices_are_possible(self, spec_str, expected_os):
@@ -1286,7 +1286,7 @@ class TestConcretize(object):
     @pytest.mark.regression("22718")
     @pytest.mark.parametrize(
         "spec_str,expected_compiler",
-        [("mpileaks", "%gcc@4.5.0"), ("mpileaks ^mpich%clang@3.3", "%clang@3.3")],
+        [("mpileaks", "%gcc@10.2.1"), ("mpileaks ^mpich%clang@12.0.0", "%clang@12.0.0")],
     )
     def test_compiler_is_unique(self, spec_str, expected_compiler):
         s = Spec(spec_str).concretized()
@@ -1462,10 +1462,12 @@ class TestConcretize(object):
 
         # The test architecture uses core2 as the default target. Check that when
         # we configure Spack for "generic" granularity we concretize for x86_64
+        default_target = spack.platforms.test.Test.default
+        generic_target = archspec.cpu.TARGETS[default_target].generic.name
         s = Spec("python")
-        assert s.concretized().satisfies("target=core2")
+        assert s.concretized().satisfies("target=%s" % default_target)
         with spack.config.override("concretizer:targets", {"granularity": "generic"}):
-            assert s.concretized().satisfies("target=x86_64")
+            assert s.concretized().satisfies("target=%s" % generic_target)
 
     def test_host_compatible_concretization(self):
         if spack.config.get("config:concretizer") == "original":
@@ -1692,12 +1694,19 @@ class TestConcretize(object):
             # version_declared("b","0.9",1,"package_py").
             # version_declared("b","1.0",2,"installed").
             # version_declared("b","0.9",3,"installed").
-            for criterion in [
-                (1, None, "number of packages to build (vs. reuse)"),
+            #
+            # Depending on the target, it may also use gnuconfig
+            result_spec = result.specs[0]
+            num_specs = len(list(result_spec.traverse()))
+
+            criteria = [
+                (num_specs - 1, None, "number of packages to build (vs. reuse)"),
                 (2, 0, "version badness"),
-            ]:
+            ]
+
+            for criterion in criteria:
                 assert criterion in result.criteria
-            assert result.specs[0].satisfies("^b@1.0")
+            assert result_spec.satisfies("^b@1.0")
 
     @pytest.mark.regression("31169")
     def test_not_reusing_incompatible_os_or_compiler(self):
@@ -1717,8 +1726,8 @@ class TestConcretize(object):
             setup = spack.solver.asp.SpackSolverSetup()
             result, _, _ = solver.driver.solve(setup, [root_spec], reuse=reusable_specs)
         concrete_spec = result.specs[0]
-        assert concrete_spec.satisfies("%gcc@4.5.0")
-        assert concrete_spec.satisfies("os=debian6")
+        assert concrete_spec.satisfies("%{}".format(s.compiler))
+        assert concrete_spec.satisfies("os={}".format(s.architecture.os))
 
     def test_git_hash_assigned_version_is_preferred(self):
         hash = "a" * 40
diff --git a/lib/spack/spack/test/concretize_preferences.py b/lib/spack/spack/test/concretize_preferences.py
index a6e568bd11..7bae90cb2c 100644
--- a/lib/spack/spack/test/concretize_preferences.py
+++ b/lib/spack/spack/test/concretize_preferences.py
@@ -8,6 +8,8 @@ import stat
 
 import pytest
 
+import archspec
+
 import spack.config
 import spack.package_prefs
 import spack.repo
@@ -109,7 +111,9 @@ class TestConcretizePreferences(object):
             pytest.skip("Fixing the parser broke this test for the original concretizer.")
 
         # Need to make sure the test uses an available compiler
-        compiler_list = spack.compilers.all_compiler_specs()
+        arch = spack.spec.ArchSpec(("test", "redhat6", archspec.cpu.host().name))
+
+        compiler_list = spack.compilers.compiler_specs_for_arch(arch)
         assert compiler_list
 
         # Try the first available compiler
diff --git a/lib/spack/spack/test/conftest.py b/lib/spack/spack/test/conftest.py
index 1f3c17916c..2f04e1d4fd 100644
--- a/lib/spack/spack/test/conftest.py
+++ b/lib/spack/spack/test/conftest.py
@@ -128,7 +128,14 @@ def mock_git_version_info(tmpdir, override_git_repos_cache_path):
 
     def commit(message):
         global commit_counter
-        git("commit", "--date", "2020-01-%02d 12:0:00 +0300" % commit_counter, "-am", message)
+        git(
+            "commit",
+            "--no-gpg-sign",
+            "--date",
+            "2020-01-%02d 12:0:00 +0300" % commit_counter,
+            "-am",
+            message,
+        )
         commit_counter += 1
 
     with working_dir(repo_path):
diff --git a/lib/spack/spack/test/data/config/compilers.yaml b/lib/spack/spack/test/data/config/compilers.yaml
index e0b0464976..6f36c13b59 100644
--- a/lib/spack/spack/test/data/config/compilers.yaml
+++ b/lib/spack/spack/test/data/config/compilers.yaml
@@ -130,6 +130,7 @@ compilers:
       f77: /path/to/gfortran440
       fc: /path/to/gfortran440
     modules: 'None'
+    target: x86_64
 - compiler:
     spec: clang@3.5
     operating_system: redhat6
@@ -167,7 +168,7 @@ compilers:
     modules: 'None'
     target: x86_64
 - compiler:
-    spec: gcc@foo
+    spec: gcc@10foo
     operating_system: redhat6
     paths:
       cc: /path/to/gcc
@@ -186,3 +187,167 @@ compilers:
       fc: /path/to/gfortran
     modules: 'None'
     target: x86_64
+- compiler:
+    spec: clang@12.0.0
+    operating_system: {0.name}{0.version}
+    paths:
+      cc: /path/to/clang
+      cxx: /path/to/clang++
+      f77: None
+      fc: None
+    modules: 'None'
+    target: aarch64
+- compiler:
+    spec: gcc@10.2.1
+    operating_system: {0.name}{0.version}
+    paths:
+      cc: /path/to/gcc
+      cxx: /path/to/g++
+      f77: None
+      fc: None
+    modules: 'None'
+    target: aarch64
+- compiler:
+    spec: clang@12.0.0
+    operating_system: redhat6
+    paths:
+      cc: /path/to/clang
+      cxx: /path/to/clang++
+      f77: None
+      fc: None
+    modules: 'None'
+    target: aarch64
+- compiler:
+    spec: gcc@10.2.1
+    operating_system: redhat6
+    paths:
+      cc: /path/to/gcc
+      cxx: /path/to/g++
+      f77: None
+      fc: None
+    modules: 'None'
+    target: aarch64
+- compiler:
+    spec: gcc@10.1.0
+    operating_system: redhat6
+    paths:
+      cc: /path/to/gcc
+      cxx: /path/to/g++
+      f77: None
+      fc: None
+    modules: 'None'
+    target: aarch64
+- compiler:
+    spec: gcc@11.1.0
+    operating_system: redhat6
+    paths:
+      cc: /path/to/gcc
+      cxx: /path/to/g++
+      f77: None
+      fc: None
+    flags:
+      cflags: -O0 -g
+      cxxflags: -O0 -g
+      fflags: -O0 -g
+    modules: 'None'
+    target: aarch64
+- compiler:
+    spec: clang@12.2.0
+    operating_system: redhat6
+    paths:
+      cc: /path/to/clang35
+      cxx: /path/to/clang++35
+      f77: None
+      fc: None
+    flags:
+      cflags: -O3
+      cxxflags: -O3
+    modules: 'None'
+    target: aarch64
+- compiler:
+    spec: gcc@10foo
+    operating_system: redhat6
+    paths:
+      cc: /path/to/gcc
+      cxx: /path/to/g++
+      f77: /path/to/gfortran
+      fc: /path/to/gfortran
+    modules: 'None'
+    target: aarch64
+- compiler:
+    spec: clang@12.0.0
+    operating_system: {0.name}{0.version}
+    paths:
+      cc: /path/to/clang
+      cxx: /path/to/clang++
+      f77: None
+      fc: None
+    modules: 'None'
+    target: x86_64
+- compiler:
+    spec: gcc@10.2.1
+    operating_system: {0.name}{0.version}
+    paths:
+      cc: /path/to/gcc
+      cxx: /path/to/g++
+      f77: None
+      fc: None
+    modules: 'None'
+    target: x86_64
+- compiler:
+    spec: clang@12.0.0
+    operating_system: redhat6
+    paths:
+      cc: /path/to/clang
+      cxx: /path/to/clang++
+      f77: None
+      fc: None
+    modules: 'None'
+    target: x86_64
+- compiler:
+    spec: gcc@10.2.1
+    operating_system: redhat6
+    paths:
+      cc: /path/to/gcc
+      cxx: /path/to/g++
+      f77: None
+      fc: None
+    modules: 'None'
+    target: x86_64
+- compiler:
+    spec: gcc@10.1.0
+    operating_system: redhat6
+    paths:
+      cc: /path/to/gcc
+      cxx: /path/to/g++
+      f77: None
+      fc: None
+    modules: 'None'
+    target: x86_64
+- compiler:
+    spec: gcc@11.1.0
+    operating_system: redhat6
+    paths:
+      cc: /path/to/gcc
+      cxx: /path/to/g++
+      f77: None
+      fc: None
+    flags:
+      cflags: -O0 -g
+      cxxflags: -O0 -g
+      fflags: -O0 -g
+    modules: 'None'
+    target: x86_64
+- compiler:
+    spec: clang@12.2.0
+    operating_system: redhat6
+    paths:
+      cc: /path/to/clang35
+      cxx: /path/to/clang++35
+      f77: None
+      fc: None
+    flags:
+      cflags: -O3
+      cxxflags: -O3
+    modules: 'None'
+    target: x86_64
diff --git a/lib/spack/spack/test/data/config/packages.yaml b/lib/spack/spack/test/data/config/packages.yaml
index 7d5e06a74c..c6ff731a7e 100644
--- a/lib/spack/spack/test/data/config/packages.yaml
+++ b/lib/spack/spack/test/data/config/packages.yaml
@@ -7,18 +7,18 @@ packages:
   externaltool:
     buildable: False
     externals:
-    - spec: externaltool@1.0%gcc@4.5.0
+    - spec: externaltool@1.0%gcc@10.2.1
       prefix: /path/to/external_tool
-    - spec: externaltool@0.9%gcc@4.5.0
+    - spec: externaltool@0.9%gcc@10.2.1
       prefix: /usr
-    - spec: externaltool@0_8%gcc@4.5.0
+    - spec: externaltool@0_8%gcc@10.2.1
       prefix: /usr
   externalvirtual:
     buildable: False
     externals:
-    - spec: externalvirtual@2.0%clang@3.3
+    - spec: externalvirtual@2.0%clang@12.0.0
       prefix: /path/to/external_virtual_clang
-    - spec: externalvirtual@1.0%gcc@4.5.0
+    - spec: externalvirtual@1.0%gcc@10.2.1
       prefix: /path/to/external_virtual_gcc
   externalmodule:
     buildable: False
@@ -49,4 +49,4 @@ packages:
       - spec: external-non-default-variant@3.8.7~foo~bar
         prefix: /usr
   version-test-dependency-preferred:
-    version: ['5.2.5']
\ No newline at end of file
+    version: ['5.2.5']
diff --git a/lib/spack/spack/test/installer.py b/lib/spack/spack/test/installer.py
index 7f608d6c89..363d92fe1f 100644
--- a/lib/spack/spack/test/installer.py
+++ b/lib/spack/spack/test/installer.py
@@ -632,7 +632,10 @@ def test_check_deps_status_external(install_mockery, monkeypatch):
     # Mock the known dependent, b, as external so assumed to be installed
     monkeypatch.setattr(spack.spec.Spec, "external", True)
     installer._check_deps_status(request)
-    assert list(installer.installed)[0].startswith("b")
+
+    # exotic architectures will add dependencies on gnuconfig, which we want to ignore
+    installed = [x for x in installer.installed if not x.startswith("gnuconfig")]
+    assert installed[0].startswith("b")
 
 
 def test_check_deps_status_upstream(install_mockery, monkeypatch):
@@ -643,7 +646,10 @@ def test_check_deps_status_upstream(install_mockery, monkeypatch):
     # Mock the known dependent, b, as installed upstream
     monkeypatch.setattr(spack.spec.Spec, "installed_upstream", True)
     installer._check_deps_status(request)
-    assert list(installer.installed)[0].startswith("b")
+
+    # exotic architectures will add dependencies on gnuconfig, which we want to ignore
+    installed = [x for x in installer.installed if not x.startswith("gnuconfig")]
+    assert installed[0].startswith("b")
 
 
 def test_add_bootstrap_compilers(install_mockery, monkeypatch):
diff --git a/lib/spack/spack/test/modules/lmod.py b/lib/spack/spack/test/modules/lmod.py
index 58c013ef86..d24ec8ca0d 100644
--- a/lib/spack/spack/test/modules/lmod.py
+++ b/lib/spack/spack/test/modules/lmod.py
@@ -24,7 +24,7 @@ writer_cls = spack.modules.lmod.LmodModulefileWriter
 pytestmark = pytest.mark.skipif(sys.platform == "win32", reason="does not run on windows")
 
 
-@pytest.fixture(params=["clang@3.3", "gcc@4.5.0"])
+@pytest.fixture(params=["clang@12.0.0", "gcc@10.2.1"])
 def compiler(request):
     return request.param
 
diff --git a/lib/spack/spack/test/sbang.py b/lib/spack/spack/test/sbang.py
index ebc9a85347..18a408a549 100644
--- a/lib/spack/spack/test/sbang.py
+++ b/lib/spack/spack/test/sbang.py
@@ -7,6 +7,7 @@
 Test that Spack's shebang filtering works correctly.
 """
 import filecmp
+import getpass
 import os
 import shutil
 import stat
@@ -268,6 +269,10 @@ def test_shebang_handles_non_writable_files(script_dir, sbang_line):
 
 @pytest.fixture(scope="function")
 def configure_group_perms():
+    # On systems with remote groups, the primary user group may be remote
+    # and grp does not act on remote groups.
+    # To ensure we find a group we can operate on, we get take the first group
+    # listed which has the current user as a member.
     conf = syaml.load_config(
         """\
 all:
@@ -276,7 +281,7 @@ all:
     write: group
     group: {0}
 """.format(
-            grp.getgrgid(os.getegid()).gr_name
+            [g.gr_name for g in grp.getgrall() if getpass.getuser() in g.gr_mem][0]
         )
     )
     spack.config.set("packages", conf, scope="user")
diff --git a/lib/spack/spack/test/spec_semantics.py b/lib/spack/spack/test/spec_semantics.py
index 7100cfdb5f..711e901416 100644
--- a/lib/spack/spack/test/spec_semantics.py
+++ b/lib/spack/spack/test/spec_semantics.py
@@ -841,7 +841,7 @@ class TestSpecSematics(object):
         # Spack was assembling flags in a manner that could result in
         # different orderings for repeated concretizations of the same
         # spec and config
-        spec_str = "libelf %gcc@4.7.2 os=redhat6"
+        spec_str = "libelf %gcc@11.1.0 os=redhat6"
         for _ in range(25):
             s = Spec(spec_str).concretized()
             assert all(
diff --git a/lib/spack/spack/test/spec_syntax.py b/lib/spack/spack/test/spec_syntax.py
index d73e226d11..ab560bed08 100644
--- a/lib/spack/spack/test/spec_syntax.py
+++ b/lib/spack/spack/test/spec_syntax.py
@@ -277,13 +277,17 @@ class TestSpecSyntax(object):
             "x ^y@1,2:3,4%intel@1,2,3,4+a~b+c~d+e~f", "x ^y~f+e~d+c~b+a@4,2:3,1%intel@4,3,2,1"
         )
 
+        default_target = spack.platforms.test.Test.default
         self.check_parse(
-            "x arch=test-redhat6-None" " ^y arch=test-None-core2" " ^z arch=linux-None-None",
+            "x arch=test-redhat6-None"
+            + (" ^y arch=test-None-%s" % default_target)
+            + " ^z arch=linux-None-None",
             "x os=fe " "^y target=be " "^z platform=linux",
         )
 
         self.check_parse(
-            "x arch=test-debian6-core2" " ^y arch=test-debian6-core2",
+            ("x arch=test-debian6-%s" % default_target)
+            + (" ^y arch=test-debian6-%s" % default_target),
             "x os=default_os target=default_target" " ^y os=default_os target=default_target",
         )
 
diff --git a/lib/spack/spack/util/gpg.py b/lib/spack/spack/util/gpg.py
index 3f0d74f4b7..ffee274c3f 100644
--- a/lib/spack/spack/util/gpg.py
+++ b/lib/spack/spack/util/gpg.py
@@ -239,7 +239,7 @@ def trust(keyfile):
     keys = _get_unimported_public_keys(output)
 
     # Import them
-    GPG("--import", keyfile)
+    GPG("--batch", "--import", keyfile)
 
     # Set trust to ultimate
     key_to_fpr = dict(public_keys_to_fingerprint())
@@ -285,7 +285,7 @@ def sign(key, file, output, clearsign=False):
             signature, if False creates a detached signature
     """
     signopt = "--clearsign" if clearsign else "--detach-sign"
-    GPG(signopt, "--armor", "--default-key", key, "--output", output, file)
+    GPG(signopt, "--armor", "--local-user", key, "--output", output, file)
 
 
 @_autoinit
diff --git a/var/spack/repos/builtin.mock/packages/bowtie/package.py b/var/spack/repos/builtin.mock/packages/bowtie/package.py
index 24d7312b74..9bef211172 100644
--- a/var/spack/repos/builtin.mock/packages/bowtie/package.py
+++ b/var/spack/repos/builtin.mock/packages/bowtie/package.py
@@ -11,8 +11,10 @@ class Bowtie(Package):
     homepage = "http://www.example.org"
     url = "http://bowtie-1.2.2.tar.bz2"
 
+    version("1.4.0", "1c837ecd990bb022d07e7aab32b09847")
     version("1.3.0", "1c837ecd990bb022d07e7aab32b09847")
     version("1.2.2", "1c837ecd990bb022d07e7aab32b09847")
     version("1.2.0", "1c837ecd990bb022d07e7aab32b09847")
 
     conflicts("%gcc@:4.5.0", when="@1.2.2")
+    conflicts("%gcc@:10.2.1", when="@:1.3.0")
diff --git a/var/spack/repos/builtin.mock/packages/impossible-concretization/package.py b/var/spack/repos/builtin.mock/packages/impossible-concretization/package.py
index c0f2ce8641..b47e97f362 100644
--- a/var/spack/repos/builtin.mock/packages/impossible-concretization/package.py
+++ b/var/spack/repos/builtin.mock/packages/impossible-concretization/package.py
@@ -16,3 +16,4 @@ class ImpossibleConcretization(Package):
     version(1.0, "0123456789abcdef0123456789abcdef")
 
     conflicts("target=x86_64:")
+    conflicts("target=aarch64:")
diff --git a/var/spack/repos/builtin.mock/packages/openblas/package.py b/var/spack/repos/builtin.mock/packages/openblas/package.py
index 5b8637aca2..1e948da8f2 100644
--- a/var/spack/repos/builtin.mock/packages/openblas/package.py
+++ b/var/spack/repos/builtin.mock/packages/openblas/package.py
@@ -12,6 +12,7 @@ class Openblas(Package):
     homepage = "http://www.openblas.net"
     url = "http://github.com/xianyi/OpenBLAS/archive/v0.2.15.tar.gz"
 
+    version("0.2.16", "b1190f3d3471685f17cfd1ec1d252ac9")
     version("0.2.15", "b1190f3d3471685f17cfd1ec1d252ac9")
     version("0.2.14", "b1190f3d3471685f17cfd1ec1d252ac9")
     version("0.2.13", "b1190f3d3471685f17cfd1ec1d252ac9")
@@ -19,4 +20,7 @@ class Openblas(Package):
     # See #20019 for this conflict
     conflicts("%gcc@:4.4", when="@0.2.14:")
 
+    # To ensure test works with newer gcc versions
+    conflicts("%gcc@:10.1", when="@0.2.16:")
+
     provides("blas")