CompileFlags:                    
  Add:
    [
      # -mlong-calls,
      -DSSIZE_MAX,
      -DLWIP_NO_UNISTD_H=1,
      -Dssize_t=long,
      -D_SSIZE_T_DECLARED,
    ]
  Remove:
    [
      -fno-tree-switch-conversion,
      -mtext-section-literals,
      -mlongcalls,
      -fstrict-volatile-bitfields,
      -free,
      -fipa-pta,
    ]