From aa5f38185495100fe9d53b6358d8d7cfa8a6388d Mon Sep 17 00:00:00 2001
From: Dylan Baker <dylan@pnwbakers.com>
Date: Wed, 1 Oct 2025 13:27:15 -0700
Subject: build: add `subdir` property to `CustomTargetIndex`

Which it needs in some contexts to be polymorphic with CustomTarget
---
 mesonbuild/build.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index ba989676f..0b6400732 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -3258,6 +3258,10 @@ class CustomTargetIndex(CustomTargetBase, HoldableObject):
     def depend_files(self) -> T.List[File]:
         return self.target.depend_files
 
+    @property
+    def subdir(self) -> str:
+        return self.target.subdir
+
     def __repr__(self):
         return '<CustomTargetIndex: {!r}[{}]>'.format(self.target, self.output)
 
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