build: cache target id at time of first use

1 files changed, 6 insertions, 2 deletions

diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index 8d3d405..9f3af9f 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']