Hi @apvanzanten! Which framework are you going to use?

I am currently using spl. However for the test case I configured it for mbed because that was the default and because it gave a cleaner and simpler test case.

I slightly modified the test case so it works for spl and put it in a separate branch of my repo.

I can suggest such workaround:
platformio.ini:

[env:disco_f407vg]
platform = ststm32
framework = spl
board = disco_f407vg
build_flags = -mthumb -march=armv7e-m -mfloat-abi=hard -mfpu=fpv4-sp-d16
extra_script = update_link_flags.py

update_link_flags.py:

# Custom settings, as referred to as "extra_script" in platformio.ini
#
# See http://docs.platformio.org/en/latest/projectconf.html#extra-script

from SCons.Script import DefaultEnvironment

env = DefaultEnvironment()

env.Append(
    LINKFLAGS=[
        "-mthumb",
        "-march=armv7e-m",
        "-mfloat-abi=hard",
        "-mfpu=fpv4-sp-d16"
    ]
)

That works a treat. Thanks!

Thanks a lot for the report! Happy Coding!

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Thanks!

Hello, I have the same problem but I'm using Platform: stm32f0discovery.
Do I have to create update_link_flags.py?

Hi. Why is this closed? I'm having the same problem with stm32f407 and it does not seem that this is fixed.

@positron96 what is your platformio.ini?

Something in the lines of this:

[platformio]

src_dir = .

[env]
platform = ststm32@14.2.0

extra_scripts = extra-build.py

build_flags = 
    -mfpu=fpv4-sp-d16
    -mfloat-abi=hard

src_filter =     
; a lot of sources

[env:stm]
board = genericSTM32F407VGT6
board_build.ldscript = STM32F407VGTx_FLASH.ld
upload_protocol = jlink
debug_tool = jlink

mfpu and mfloat-eabi don't get passed to linker, so I had to manually patch that with a script

so I had to manually patch that with a script

Sorry, this is a valid solution at this time. We will work on #2144