linkers: Accept both str and List[str] for _apply_prefix

Simplifies some usage.

1 files changed, 10 insertions, 6 deletions

diff --git a/mesonbuild/linkers.py b/mesonbuild/linkers.py
index a106714..a60248b 100644
--- a/mesonbuild/linkers.py
+++ b/mesonbuild/linkers.py
@@ -246,12 +246,16 @@ class DynamicLinker(metaclass=abc.ABCMeta):
         'custom': [],
     }  # type: T.Dict[str, T.List[str]]
 
-    def _apply_prefix(self, arg: str) -> T.List[str]:
+    def _apply_prefix(self, arg: T.Union[str, T.List[str]]) -> T.List[str]:
+        args = [arg] if isinstance(arg, str) else arg
         if self.prefix_arg is None:
-            return [arg]
+            return args
         elif isinstance(self.prefix_arg, str):
-            return [self.prefix_arg + arg]
-        return self.prefix_arg + [arg]
+            return [self.prefix_arg + arg for arg in args]
+        ret = []
+        for arg in args:
+            ret += self.prefix_arg + [arg]
+        return ret
 
     def __init__(self, exelist: T.List[str], for_machine: mesonlib.MachineChoice,
                  id_: str, prefix_arg: T.Union[str, T.List[str]],
@@ -796,7 +800,7 @@ class VisualStudioLikeLinkerMixin:
         return self._apply_prefix('/MDd')
 
     def get_output_args(self, outputname: str) -> T.List[str]:
-        return self._apply_prefix('/MACHINE:' + self.machine) + self._apply_prefix('/OUT:' + outputname)
+        return self._apply_prefix(['/MACHINE:' + self.machine, '/OUT:' + outputname])
 
     def get_always_args(self) -> T.List[str]:
         return self._apply_prefix('/nologo') + super().get_always_args()
@@ -810,7 +814,7 @@ class VisualStudioLikeLinkerMixin:
     def get_debugfile_args(self, targetfile: str) -> T.List[str]:
         pdbarr = targetfile.split('.')[:-1]
         pdbarr += ['pdb']
-        return self._apply_prefix('/DEBUG') + self._apply_prefix('/PDB:' + '.'.join(pdbarr))
+        return self._apply_prefix(['/DEBUG', '/PDB:' + '.'.join(pdbarr)])
 
     def get_link_whole_for(self, args: T.List[str]) -> T.List[str]:
         # Only since VS2015