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--lto_keep_all_symbols, --no_lto_keep_all_symbols
Specifies whether link time optimization removes unreferenced global symbols.
Using --lto_keep_all_symbols affects
all symbols and largely reduces the usefulness of link time optimization. If you
need to keep only a specific unreferenced symbol, then use the --keep option instead.
Default
The default is --no_lto_keep_all_symbols.