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Precautions

  1. To add the -mllvm option, you need to add the prefix -Wl, to pass the option to a linker. For example, to add -mllvm -align-all-functions=8, change it to -Wl,-mllvm,-align-all-functions=8 when enabling LTO.
  2. The LTO principles determine that the product of the -c option is LLVM bitcode instead of ELF binary before the link. Therefore, ensure that the -flto option is added to the link step. Failure to do so may result in the symbol not being found (error message is similar to "undefined reference to xxx").