cuda: respect host compiler -Werror

The cuda compiler also executes the host compiler and generally needs to know
the host compiler flags. We did this for regular args but not for error args.
We use `-Xcompiler=` since that's how nvcc tells the difference between args
it uses itself for device code and args it passes to the host compiler.

Signed-off-by: Eli Schwartz <[email protected]>
[eli: fix quoting style]

mesonbuild/compilers/cuda.py

@@ -199,6 +199,7 @@ def __init__(self, ccache: T.List[str], exelist: T.List[str], version: str, for_
             level: self._to_host_flags(list(f for f in flags if f != '-Wpedantic'))
             for level, flags in host_compiler.warn_args.items()
         }
+        self.host_werror_args = ['-Xcompiler=' + x for x in self.host_compiler.get_werror_args()]
 
     @classmethod
     def _shield_nvcc_list_arg(cls, arg: str, listmode: bool = True) -> str:
@@ -708,7 +709,8 @@ def get_debug_args(self, is_debug: bool) -> T.List[str]:
         return cuda_debug_args[is_debug]
 
     def get_werror_args(self) -> T.List[str]:
-        return ['-Werror=cross-execution-space-call,deprecated-declarations,reorder']
+        device_werror_args = ['-Werror=cross-execution-space-call,deprecated-declarations,reorder']
+        return device_werror_args + self.host_werror_args
 
     def get_warn_args(self, level: str) -> T.List[str]:
         return self.warn_args[level]