[develop2] undefined settings (#13161)

conans/test/integration/settings/test_non_defining_settings.py

@@ -0,0 +1,31 @@
+import textwrap
+
+from conans.test.utils.tools import TestClient
+
+
+def test_settings_not_defined_consuming():
+    c = TestClient()
+    conanfile = textwrap.dedent("""
+        from conan import ConanFile
+        class Pkg(ConanFile):
+            name = "pkg"
+            version = "1.0"
+            settings = "os", "arch"
+
+            def build(self):
+                self.output.info(f"Building with os={self.settings.os}")
+                self.output.info(f"Building with arch={self.settings.arch}")
+
+            def package_id(self):
+                del self.info.settings.os
+                del self.info.settings.arch
+        """)
+    c.save({"conanfile.py": conanfile,
+            "profile": ""})
+    c.run("create . -pr=profile -s os=Windows -s arch=armv8")
+    assert "Building with os=Windows" in c.out
+    assert "Building with arch=armv8" in c.out
+    c.run("install --requires=pkg/1.0 -pr=profile")
+    # It doesn't fail, even if settings not defined
+    c.run("install --requires=pkg/1.0 -pr=profile -s os=Linux -s arch=x86")
+    # It doesn't fail, even if settings different value