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-rw-r--r--mesonbuild/interpreter.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/mesonbuild/interpreter.py b/mesonbuild/interpreter.py
index 3efc88c..4b713ea 100644
--- a/mesonbuild/interpreter.py
+++ b/mesonbuild/interpreter.py
@@ -2471,7 +2471,8 @@ external dependencies (including libraries) must go to "dependencies".''')
self.active_projectname = current_active
self.subprojects.update(subi.subprojects)
self.subprojects[dirname] = SubprojectHolder(subi, self.subproject_dir, dirname)
- self.build_def_files += subi.build_def_files
+ # Duplicates are possible when subproject uses files from project root
+ self.build_def_files = list(set(self.build_def_files + subi.build_def_files))
self.build.merge(subi.build)
self.build.subprojects[dirname] = subi.project_version
return self.subprojects[dirname]