Compiling code for genericSTM32F411CE via platformio fails with an error for stm32duino (2.8.1)

[brightproject]

I am compiling code for blackpill_f411ce microcontroller.
I get a compiler error:

Processing genericSTM32F411CE (platform: ststm32; board: blackpill_f411ce; framework: arduino)
Verbose mode can be enabled via -v, --verbose option
CONFIGURATION: https://docs.platformio.org/page/boards/ststm32/blackpill_f411ce.html
PLATFORM: ST STM32 (17.4.0) > WeAct Studio BlackPill V2.0 (STM32F411CE)
HARDWARE: STM32F411CEU6 100MHz, 128KB RAM, 512KB Flash
DEBUG: Current (blackmagic) External (blackmagic, cmsis-dap, jlink, stlink)
PACKAGES:

• framework-arduinoststm32 @ 4.20801.240815 (2.8.1)
• framework-cmsis @ 2.50900.0 (5.9.0)
• toolchain-gccarmnoneeabi @ 1.120301.0 (12.3.1)
  LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
  LDF Modes: Finder ~ chain, Compatibility ~ soft
  Found 19 compatible libraries
  Scanning dependencies...
  Dependency Graph
  |-- CalLib
  |-- I2CDev
  |-- RTIMULib
  |-- RTArduLink
  |-- SimpleKalman
  |-- EEPROM @ 2.0.1
  |-- Wire @ 1.0.0
  Building in release mode
  Linking .pio\build\genericSTM32F411CE\firmware.elf

.platformio/packages/toolchain-gccarmnoneeabi/bin/../lib/gcc/arm-none-eabi/12.3.1/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard\libc_nano.a(libc_a-openr.o): in function `_open_r':

openr.c:(.text._open_r+0x10): undefined reference to `_open'
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\genericSTM32F411CE\firmware.elf] Error 1
========================= [FAILED] Took 6.20 seconds=========================

Environment Status Duration

---

genericSTM32F411CE FAILED 00:00:06.195
========================= 1 failed, 0 succeeded in 00:00:06.195=========================

• The terminal process ".platformio\penv\Scripts\platformio.exe 'run'" terminated with exit code: 1.
• Terminal will be reused by tasks, press any key to close it.

I didn't find any useful advice, there are some explanations, but what needs to be changed and in which file is beyond my knowledge.

https://stackoverflow.com/questions/65453293/what-are-nosys-nano-rdimon-terms-when-using-arm-gcc

I would be grateful to the community for help with this issue.

P.S. There was another error, but I fixed it using the previous method.

#2475 (comment)

[fpistm]

Hi @brightproject
Unfortunately, we do not support PIO only Arduino IDE 2.x.
You should submit your issue on pio forum or GitHub.

[brightproject]

we do not support PIO only Arduino IDE 2.x.

Sorry @fpistm , but I'm confused.
In platformio I use this framework:

https://registry.platformio.org/tools/platformio/framework-arduinoststm32/installation

And in it the link leads to this repository:

https://github.com/stm32duino/Arduino_Core_STM32

That's actually why I wrote a question in the discussion.
I'll also try to use the repository from here:

https://registry.platformio.org/platforms/platformio/ststm32/installation
https://github.com/platformio/platform-ststm32

Sorry to bother you🙂

[fpistm]

Yes they integrate this core but the integration is different than then one with Arduino IDE. If you reproduced using Arduino IDE the you can submit here. But I can't support the integration from pio.

[brightproject]

If you reproduced using Arduino IDE then you can submit here.

Yes, now I understand the difference.
Thanks again and sorry for the inconvenience.

[fpistm]

Welcome 😉

[brightproject]

Welcome

Thanks @fpistm

The error is similar in the Arduino IDE environment.

arm-none-eabi/lib/thumb/v7e-m+fp/hard\libc_nano.a(libc_a-openr.o): in function _open_r': openr.c:(.text._open_r+0x10): undefined reference to _open'
collect2.exe: error: ld returned 1 exit status

The source code is in the archive.

RTIMULib2_New.zip

If only I knew the reason for such an error during assembly, I would refactor the code.

[brightproject]

Found the reason for the compilation errors, very strange and incomprehensible to me.
Answer received by indirect signs, thanks to information from here:

https://devzone.nordicsemi.com/f/nordic-q-a/105594/undefined-reference-to-_open-when-using-libc-with-ncs-2-4-2-and-above

In actual discussion it was pointed out that the problem may be the use of fopen(), in the specific code

https://github.com/avpripri/RTIMULib2

fopen is used to open the *ini file with settings, for the case of using the code on the RPI platform with Linux.

Just commented out the lines.

https://github.com/avpripri/RTIMULib2/blob/3ff3a59101eb09523a2e375b5c43edb98fce77da/RTIMULib/RTIMUSettings.cpp#L604

https://github.com/avpripri/RTIMULib2/blob/3ff3a59101eb09523a2e375b5c43edb98fce77da/RTIMULib/RTIMUSettings.cpp#L910

The code compiles quickly and without errors.
Also builds for .pio

platformio/platform-ststm32#801 (comment)

The error is extremely unclear and perhaps it will help someone in the future.