dependencies/cuda: Add support for disabling the cuda runtime

Author: dcbaker

docs/markdown/Dependencies.md

@@ -391,6 +391,11 @@ set the path using `CUDA_PATH` explicitly.
 Cuda does not honor the `prefer_static` option, and will link statically unless
 the `static` keyword argument is set to `false`.
 
+A special set of modules called `cudart`, `cudart_static` and `cudart_none` can
+be used to control the Cuda Runtime used. If none of these are passed
+`cudart_static` is automatically added unless the `static` keyword argument is
+set to `false`, then `cudart` is chosen.
+
 ## CUPS
 
 `method` may be `auto`, `config-tool`, `pkg-config`, `cmake` or `extraframework`.

docs/markdown/snippets/cuda_dep_no_runtime.md

@@ -0,0 +1,4 @@
+## Cuda dependency with cudart_none
+
+The Cuda dependency can now be initialize as `dependency('cuda', modules : ['cudart_none'])`,
+which will result in no runtime. This is equivalent to `--cudart none` on the command line.

mesonbuild/dependencies/cuda.py

@@ -14,6 +14,7 @@
 from .base import DependencyException, SystemDependency
 from .detect import packages
 from ..mesonlib import LibType
+from ..interpreterbase import FeatureNew
 
 if T.TYPE_CHECKING:
     from ..environment import Environment
@@ -40,7 +41,10 @@ def __init__(self, environment: 'Environment', kwargs: DependencyObjectKWs) -> N
         super().__init__('cuda', environment, kwargs, language=language)
         self.lib_modules: T.Dict[str, T.List[str]] = {}
         self.requested_modules = kwargs.get('modules', [])
-        if not any(runtime in self.requested_modules for runtime in ['cudart', 'cudart_static']):
+        if 'cudart_none' in self.requested_modules:
+            self.featurechecks.append(FeatureNew('Cuda module cudart_none', '1.10'))
+
+        if not any(runtime in self.requested_modules for runtime in ['cudart', 'cudart_static', 'cudart_none']):
             # By default, we prefer to link the static CUDA runtime, since this is what nvcc also does by default:
             # https://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/index.html#cudart-none-shared-static-cudart
             req_modules = ['cudart']
@@ -273,6 +277,10 @@ def _find_requested_libraries(self) -> bool:
         all_found = True
 
         for module in self.requested_modules:
+            if module == 'cudart_none':
+                self.lib_modules[module] = []
+                continue
+
             # You should only ever link to libraries inside the cuda tree, nothing outside of it.
             # For instance, there is a
             #
@@ -319,6 +327,7 @@ def get_link_args(self, language: T.Optional[str] = None, raw: bool = False) ->
         REWRITE_MODULES = {
             'cudart': ['-cudart', 'shared'],
             'cudart_static': ['-cudart', 'static'],
+            'cudart_none': ['-cudart', 'none'],
             'cudadevrt': ['-cudadevrt'],
         }