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+CMAKE_<LANG>_FLAGS_INIT
+-----------------------
+
+Value used to initialize the :variable:`CMAKE_<LANG>_FLAGS` cache entry
+the first time a build tree is configured for language ``<LANG>``.
+This variable is meant to be set by a :variable:`toolchain file
+<CMAKE_TOOLCHAIN_FILE>`. CMake may prepend or append content to
+the value based on the environment and target platform.
+
+See also the configuration-specific
+:variable:`CMAKE_<LANG>_FLAGS_<CONFIG>_INIT` variable.