Cortex-m3

 -mcpu=cortex-m3
 -mthumb
 -mfloat-abi=soft
 -O3

Cortex-m4

 -mcpu=cortex-m4
 -mthumb
 -mfloat-abi=hard
 -mfpu=fpv4-sp-d16
 -O3

 * If you want to use SIMD
 -DSTM32F4

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