GCC ARM 7.2.1 compiler

i need a little advise

on

gcc_7_2_1\arm-none-eabi\lib\thumb

exist

  • v6-m
  • v7-ar
  • v7-m
  • v7e-m
  • v8-m.base
  • v8-m.main

can someone explain to me what those folders (numbers) mean and which ones to use for STM32F4xx

founded info

https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html

and other info too

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