Unable to build code with FPU flag enabled in .ini

PlatformIO IDE
1

Hello everyone. I have been coding stuff for my WeAct STM32f411ceu6 blackpill board. For the last day, I’ve been trying to build the code with the following settings:

[env:blackpill_f411ce]
platform = ststm32
board = blackpill_f411ce
framework = stm32cube

build_flags =
    -Ilib/USB_DEVICE/include
    -Ilib/STM32_USB_Device_Library/Core/Inc
    -Ilib/STM32_USB_Device_Library/Class/CDC/Inc

    -mcpu=cortex-m4
    -mfpu=fpv4-sp-d16
    -mfloat-abi=hard
    -O2
    -Wall

; Use J-Link for upload & debug
upload_protocol = jlink
debug_tool = jlink
debug_init_break = tbreak main

; keep ELF for Ozone
build_type = debug
monitor_speed = 115200

However, upon attempting to build the code I get (many of):

c:/users/martin/.platformio/packages/toolchain-gccarmnoneeabi/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: error: .pio/build/blackpill_f411ce/lib548/libCDC.a(usbd_cdc.o) uses VFP register arguments, .pio/build/blackpill_f411ce/firmware.elf does not
c:/users/martin/.platformio/packages/toolchain-gccarmnoneeabi/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/bin/ld.exe: failed to merge target specific data of file .pio/build/blackpill_f411ce/lib548/libCDC.a(usbd_cdc.o)
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\blackpill_f411ce\firmware.elf] Error 1

These errors occur for a myriad of other files. To my understanding this is because platformio pulls a version of the HAL framework which is not built with FPU enabled, but I’m not entirely sure as this is my first experience with large C projects, especially in platformio. I was wondering what I must set in my platformio.ini settings to build the code with the FPU enabled? The usage of the FPU is critical for my use case.

Thanks for the help!

2

You need to propogate the FPU flags to all build and environments and the linking stage as well through an extra_script. See already posted solution in

1 Like
3

This seems to have worked! Thank you!