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3.17.36 RL78 Options
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-msim - 
    
Links in additional target libraries to support operation within a simulator.
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-mmul=none - 
    
-mmul=g13 - 
    
-mmul=rl78 - 
    
Specifies the type of hardware multiplication support to be used. The default is ‘none’, which uses software multiplication functions. The ‘g13’ option is for the hardware multiply/divide peripheral only on the RL78/G13 targets. The ‘rl78’ option is for the standard hardware multiplication defined in the RL78 software manual.
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-m64bit-doubles - 
    
-m32bit-doubles - 
    
Make the
doubledata type be 64 bits (-m64bit-doubles) or 32 bits (-m32bit-doubles) in size. The default is -m32bit-doubles. 
© Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
 https://gcc.gnu.org/onlinedocs/gcc-5.5.0/gcc/RL78-Options.html