Use more specific warning message

Change-Id: I98a72a95e2b51f8a4b577dcef15f40e7c28719a2

Author: lhutton1

src/target/llvm/llvm_instance.cc

@@ -225,7 +225,7 @@ LLVMTargetInfo::LLVMTargetInfo(LLVMInstance& instance, const TargetJSON& target)
       // give the code a chance to run with a less-specific target.
       LOG(ERROR) << "LLVM cpu architecture `-mcpu=" << cpu_
                  << "` is not valid in `-mtriple=" << triple_ << "`"
-                 << ", cpu architecture ignored";
+                 << ", using default `-mcpu=" << String(defaults::cpu) << "`";
     }
   }
 

tests/python/relay/strategy/test_select_implementation.py

@@ -27,6 +27,7 @@
 from tvm.relay.testing import run_infer_type, run_opt_pass
 import tvm.testing
 from tvm import topi
+from tvm.target.codegen import llvm_version_major
 
 
 @pytest.mark.parametrize(
@@ -90,6 +91,9 @@ def _get_conv2d_impl(dtype, target):
     return impl.name
 
 
+@pytest.mark.skipif(
+    llvm_version_major() < 15, reason=f"Requires LLVM 15+, got {llvm_version_major()}"
+)
 @pytest.mark.parametrize(
     "target,expected_impl",
     [
@@ -132,6 +136,9 @@ def test_int8_conv2d(target, expected_impl):
     assert selected_impl == expected_impl
 
 
+@pytest.mark.skipif(
+    llvm_version_major() < 15, reason=f"Requires LLVM 15+, got {llvm_version_major()}"
+)
 @pytest.mark.parametrize(
     "target,expected_impl",
     [
@@ -166,6 +173,9 @@ def test_fp32_conv2d(target, expected_impl):
     assert selected_impl == expected_impl
 
 
+@pytest.mark.skipif(
+    llvm_version_major() < 15, reason=f"Requires LLVM 15+, got {llvm_version_major()}"
+)
 @pytest.mark.parametrize(
     "target,expected_impl",
     [

tests/python/target/test_llvm_features_info.py

@@ -42,8 +42,10 @@ def test_llvm_targets(capfd):
     tvm.target.codegen.llvm_get_cpu_features(
         tvm.target.Target("llvm -mtriple=x86_64-linux-gnu -mcpu=dummy")
     )
-    expected_str = ("Error: LLVM cpu architecture `-mcpu=dummy` is not valid in "
-                    "`-mtriple=x86_64-linux-gnu`, cpu architecture ignored")
+    expected_str = (
+        "Error: LLVM cpu architecture `-mcpu=dummy` is not valid in "
+        "`-mtriple=x86_64-linux-gnu`, using default `-mcpu=generic`"
+    )
     assert expected_str in capfd.readouterr().err