Namespace the embedded mutation target

CMakeLists.txt

@@ -173,12 +173,19 @@ set_tests_properties(
 # re-runs the whole suite once per mutant, so it is a manual target rather than
 # a CTest test:
 #   cmake --build build --target mutation
+# When embedded in another project, use a namespaced target to avoid collisions
+# with mutation targets provided by sibling dependencies.
 # This target covers both src/stdlib.c and include/akstdlib.h. CI runs the
 # narrower, faster src/stdlib.c set with a --threshold gate; see
 # .gitea/workflows/ci.yaml.
 find_package(Python3 COMPONENTS Interpreter)
 if(Python3_FOUND)
-  add_custom_target(mutation
+  if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+    set(AKSL_MUTATION_TARGET mutation)
+  else()
+    set(AKSL_MUTATION_TARGET akstdlib_mutation)
+  endif()
+  add_custom_target(${AKSL_MUTATION_TARGET}
     COMMAND ${Python3_EXECUTABLE}
             ${CMAKE_CURRENT_SOURCE_DIR}/scripts/mutation_test.py
             --source-root ${CMAKE_CURRENT_SOURCE_DIR}