From e0fd2ffae55a6679655e12e4e4880c530184140f Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 9 Jan 2025 12:35:57 +0100
Subject: build: cache target id at time of first use

---
 mesonbuild/build.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index 8d3d4052d..9f3af9fba 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -25,7 +25,7 @@ from .mesonlib import (
     extract_as_list, typeslistify, stringlistify, classify_unity_sources,
     get_filenames_templates_dict, substitute_values, has_path_sep,
     PerMachineDefaultable,
-    MesonBugException, EnvironmentVariables, pickle_load,
+    MesonBugException, EnvironmentVariables, pickle_load, lazy_property,
 )
 from .options import OptionKey
 
@@ -627,13 +627,17 @@ class Target(HoldableObject, metaclass=abc.ABCMeta):
             return subdir_part + '@@' + my_id
         return my_id
 
-    def get_id(self) -> str:
+    @lazy_property
+    def id(self) -> str:
         name = self.name
         if getattr(self, 'name_suffix_set', False):
             name += '.' + self.suffix
         return self.construct_id_from_path(
             self.subdir, name, self.type_suffix())
 
+    def get_id(self) -> str:
+        return self.id
+
     def process_kwargs_base(self, kwargs: T.Dict[str, T.Any]) -> None:
         if 'build_by_default' in kwargs:
             self.build_by_default = kwargs['build_by_default']
-- 
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