[Error] How to fix ARMCLANG no FPU warning for Cortex-M1

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When you get a warning in Keil uVision compiler:

Code: Select all

#warning "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"

you should set compilers' floating point option:
-mfloat-abi=soft

Other possible options:
soft - Software library functions for floating-point operations and software floating-point linkage.
softfp - Hardware floating-point instructions and software floating-point linkage.
hard - Hardware floating-point instructions and hardware floating-point linkage.

Keil_FPU_PRESENT.png (45.45 KiB) Viewed 8174 times

https://developer.arm.com/documentation ... mfloat-abi
https://gcc.gnu.org/onlinedocs/gcc-4.4. ... tions.html
https://habr.com/ru/company/embox/blog/418295/