interpreter: validate that a target is linkable in link_whole check

This catches the addition of un-linkable targets at the interpreter
level rather than requiring the build layer to handle this. In turn,
this gives the end user a better error message.

1 files changed, 3 insertions, 1 deletions

diff --git a/mesonbuild/interpreter/type_checking.py b/mesonbuild/interpreter/type_checking.py
index 259b55f75..2d9f2a11e 100644
--- a/mesonbuild/interpreter/type_checking.py
+++ b/mesonbuild/interpreter/type_checking.py
@@ -449,10 +449,12 @@ LINK_WITH_KW: KwargInfo[T.List[T.Union[BothLibraries, SharedLibrary, StaticLibra
     extra_types={Dependency: lambda _: _LINK_WITH_ERROR}
 )
 
-def link_whole_validator(values: T.List[T.Union[StaticLibrary, CustomTarget, CustomTargetIndex, Dependency]]) -> T.Optional[str]:
+def link_whole_validator(values: T.List[T.Union[StaticLibrary, CustomTarget, CustomTargetIndex]]) -> T.Optional[str]:
     for l in values:
         if isinstance(l, (CustomTarget, CustomTargetIndex)) and l.links_dynamically():
             return f'{type(l).__name__} returning a shared library is not allowed'
+        if not l.is_linkable_target():
+            return f'Link target "{l!s}" is not linkable'
     return None
 
 LINK_WHOLE_KW: KwargInfo[T.List[T.Union[BothLibraries, StaticLibrary, CustomTarget, CustomTargetIndex]]] = KwargInfo(