CubeIDE sprintf does not work with %f

[KWuer]

When I create a new project and put in "-u _printf_float"  as linker option and select "Use float with printf from newlib-nano (-u _printf_float) then sprintf does not convert float values.

but when I import a TrueStudio project where sprintf works with floats, then it works also in CubeIDE. What did I miss?

Compiler Settings:

-mcpu=cortex-m4 -std=gnu11 -g3 -DUSE_HAL_DRIVER -DSTM32F446xx -DDEBUG -c -I../Inc -I../Drivers/CMSIS/Include -I../Drivers/STM32F4xx_HAL_Driver/Inc -I../Drivers/CMSIS/Device/ST/STM32F4xx/Include -I../Drivers/STM32F4xx_HAL_Driver/Inc/Legacy -O0 -ffunction-sections -fdata-sections -Wall -fstack-usage --specs=nano.specs -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb

Linker settings:

-mcpu=cortex-m4 -T"D:\HiDrive\STM32\workspace_1.0.0\printf\STM32F446RETX_FLASH.ld" --specs=nosys.specs -Wl,-Map="${ProjName}.map" -Wl,--gc-sections -static -u _printf_float --specs=nano.specs -mfpu=fpv4-sp-d16 -mfloat-abi=hard -mthumb -u _printf_float -Wl,--start-group -lc -lm -Wl,--end-group

[RaphyLoulou]

Well, thank you for the explanation's link. This is very interesting to learn, and lead me to review the memory management options set within CubeIDE project. This had more impacts than I expected but works well if you correctly follow the implementation suggested by DRNadler. Nevertheless this doesn't explain why simply removing the faulty _sbrk function works (but maybe doesn't works well, in fact I can't find the function that could be called instead...).

[BJone.6]

Bless your souls for mentioning _sbrk this was driving me up the wall