Cross compile guard

py/requirements.txt

@@ -5,4 +5,5 @@ pybind11==2.6.2
 torch>=2.8.0.dev,<2.9.0
 torchvision>=0.22.0.dev,<0.23.0
 --extra-index-url https://pypi.ngc.nvidia.com
-pyyaml
+pyyaml
+dllist

py/torch_tensorrt/_compile.py

@@ -9,7 +9,7 @@
 import torch
 import torch.fx
 from torch_tensorrt._enums import dtype
-from torch_tensorrt._features import ENABLED_FEATURES
+from torch_tensorrt._features import ENABLED_FEATURES, needs_cross_compile
 from torch_tensorrt._Input import Input
 from torch_tensorrt.dynamo import _defaults
 from torch_tensorrt.dynamo.runtime._CudaGraphsTorchTensorRTModule import (
@@ -301,6 +301,7 @@ def compile(
         raise RuntimeError("Module is an unknown format or the ir requested is unknown")
 
 
+@needs_cross_compile
 def cross_compile_for_windows(
     module: torch.nn.Module,
     file_path: str,

py/torch_tensorrt/_features.py

@@ -3,7 +3,10 @@
 from collections import namedtuple
 from typing import Any, Callable, Dict, List, Optional, Type, TypeVar
 
-from torch_tensorrt._utils import sanitized_torch_version
+from torch_tensorrt._utils import (
+    check_cross_compile_trt_win_lib,
+    sanitized_torch_version,
+)
 
 from packaging import version
 
@@ -15,6 +18,7 @@
         "dynamo_frontend",
         "fx_frontend",
         "refit",
+        "windows_cross_compile",
     ],
 )
 
@@ -38,9 +42,15 @@
 _DYNAMO_FE_AVAIL = version.parse(sanitized_torch_version()) >= version.parse("2.1.dev")
 _FX_FE_AVAIL = True
 _REFIT_AVAIL = True
+_WINDOWS_CROSS_COMPILE = check_cross_compile_trt_win_lib()
 
 ENABLED_FEATURES = FeatureSet(
-    _TS_FE_AVAIL, _TORCHTRT_RT_AVAIL, _DYNAMO_FE_AVAIL, _FX_FE_AVAIL, _REFIT_AVAIL
+    _TS_FE_AVAIL,
+    _TORCHTRT_RT_AVAIL,
+    _DYNAMO_FE_AVAIL,
+    _FX_FE_AVAIL,
+    _REFIT_AVAIL,
+    _WINDOWS_CROSS_COMPILE,
 )
 
 
@@ -80,6 +90,22 @@ def not_implemented(*args: List[Any], **kwargs: Dict[str, Any]) -> Any:
     return wrapper
 
 
+def needs_cross_compile(f: Callable[..., Any]) -> Callable[..., Any]:
+    def wrapper(*args: List[Any], **kwargs: Dict[str, Any]) -> Any:
+        if ENABLED_FEATURES.windows_cross_compile:
+            return f(*args, **kwargs)
+        else:
+
+            def not_implemented(*args: List[Any], **kwargs: Dict[str, Any]) -> Any:
+                raise NotImplementedError(
+                    "Windows cross compilation feature is not available"
+                )
+
+            return not_implemented(*args, **kwargs)
+
+    return wrapper
+
+
 T = TypeVar("T")
 
 

py/torch_tensorrt/_utils.py

@@ -1,4 +1,6 @@
 from typing import Any
+import sys
+import platform
 
 import torch
 
@@ -9,3 +11,16 @@ def sanitized_torch_version() -> Any:
         if ".nv" not in torch.__version__
         else torch.__version__.split(".nv")[0]
     )
+
+
+def check_cross_compile_trt_win_lib() -> bool:
+    # cross compile feature is only available on linux
+    # build engine on linux and run on windows
+    import dllist
+
+    if sys.platform.startswith("linux"):
+        loaded_libs = dllist.dllist()
+        target_lib = "libnvinfer_builder_resource_win.so.*"
+        if target_lib in loaded_libs:
+            return True
+    return False

py/torch_tensorrt/dynamo/_compiler.py

@@ -11,6 +11,7 @@
 from torch.fx.node import Target
 from torch_tensorrt._Device import Device
 from torch_tensorrt._enums import EngineCapability, dtype
+from torch_tensorrt._features import needs_cross_compile
 from torch_tensorrt._Input import Input
 from torch_tensorrt.dynamo import _defaults, partitioning
 from torch_tensorrt.dynamo._DryRunTracker import (
@@ -50,6 +51,7 @@
 logger = logging.getLogger(__name__)
 
 
+@needs_cross_compile
 def cross_compile_for_windows(
     exported_program: ExportedProgram,
     inputs: Optional[Sequence[Sequence[Any]]] = None,
@@ -1223,6 +1225,7 @@ def convert_exported_program_to_serialized_trt_engine(
     return serialized_engine
 
 
+@needs_cross_compile
 def save_cross_compiled_exported_program(
     gm: torch.fx.GraphModule,
     file_path: str,

pyproject.toml

@@ -13,6 +13,7 @@ requires = [
     "pybind11==2.6.2",
     "numpy",
     "sympy",
+    "dllist",
 ]
 build-backend = "setuptools.build_meta"
 
@@ -63,6 +64,7 @@ dependencies = [
     "packaging>=23",
     "numpy",
     "typing-extensions>=4.7.0",
+    "dllist",
 ]
 
 dynamic = ["version"]

tests/py/dynamo/runtime/test_003_cross_compile_for_windows.py

@@ -8,6 +8,7 @@
 import torch_tensorrt
 from torch.testing._internal.common_utils import TestCase
 from torch_tensorrt.dynamo.utils import get_model_device
+from torch_tensorrt._utils import check_cross_compile_trt_win_lib
 
 from ..testing_utilities import DECIMALS_OF_AGREEMENT
 
@@ -17,6 +18,10 @@ class TestCrossCompileSaveForWindows(TestCase):
         platform.system() != "Linux" or platform.architecture()[0] != "64bit",
         "Cross compile for windows can only be enabled on linux x86-64 platform",
     )
+    @unittest.skipIf(
+        not (check_cross_compile_trt_win_lib()),
+        "TRT windows lib for cross compile not found",
+    )
     @pytest.mark.unit
     def test_cross_compile_for_windows(self):
         class Add(torch.nn.Module):
@@ -41,6 +46,10 @@ def forward(self, a, b):
         platform.system() != "Linux" or platform.architecture()[0] != "64bit",
         "Cross compile for windows can only be enabled on linux x86-64 platform",
     )
+    @unittest.skipIf(
+        not (check_cross_compile_trt_win_lib()),
+        "TRT windows lib for cross compile not found",
+    )
     @pytest.mark.unit
     def test_dynamo_cross_compile_for_windows(self):
         class Add(torch.nn.Module):
@@ -69,6 +78,10 @@ def forward(self, a, b):
         platform.system() != "Linux" or platform.architecture()[0] != "64bit",
         "Cross compile for windows can only be enabled on linux x86-64 platform",
     )
+    @unittest.skipIf(
+        not (check_cross_compile_trt_win_lib()),
+        "TRT windows lib for cross compile not found",
+    )
     @pytest.mark.unit
     def test_dynamo_cross_compile_for_windows_cpu_offload(self):
         class Add(torch.nn.Module):