Linker Warnings on every new project

[Robert Ritchey]

Moved from MPUs forum

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Every new project I start now has linker error at the end

D:/STMicro/STM32Cube/IDE_1.14/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.11.3.rel1.win32_1.1.100.202309141235/tools/bin/../lib/gcc/arm-none-eabi/11.3.1/../../../../arm-none-eabi/bin/ld.exe: D:/STMicro/STM32Cube/IDE_1.14/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.11.3.rel1.win32_1.1.100.202309141235/tools/bin/../lib/gcc/arm-none-eabi/11.3.1/../../../../arm-none-eabi/lib/thumb/v6-m/nofp\libc_nano.a(libc_a-closer.o): in function `_close_r':
(.text._close_r+0xc): warning: _close is not implemented and will always fail
D:/STMicro/STM32Cube/IDE_1.14/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.11.3.rel1.win32_1.1.100.202309141235/tools/bin/../lib/gcc/arm-none-eabi/11.3.1/../../../../arm-none-eabi/bin/ld.exe: D:/STMicro/STM32Cube/IDE_1.14/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.11.3.rel1.win32_1.1.100.202309141235/tools/bin/../lib/gcc/arm-none-eabi/11.3.1/../../../../arm-none-eabi/lib/thumb/v6-m/nofp\libc_nano.a(libc_a-lseekr.o): in function `_lseek_r':
(.text._lseek_r+0x10): warning: _lseek is not implemented and will always fail
D:/STMicro/STM32Cube/IDE_1.14/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.11.3.rel1.win32_1.1.100.202309141235/tools/bin/../lib/gcc/arm-none-eabi/11.3.1/../../../../arm-none-eabi/bin/ld.exe: D:/STMicro/STM32Cube/IDE_1.14/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.11.3.rel1.win32_1.1.100.202309141235/tools/bin/../lib/gcc/arm-none-eabi/11.3.1/../../../../arm-none-eabi/lib/thumb/v6-m/nofp\libc_nano.a(libc_a-readr.o): in function `_read_r':
(.text._read_r+0x10): warning: _read is not implemented and will always fail
D:/STMicro/STM32Cube/IDE_1.14/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.11.3.rel1.win32_1.1.100.202309141235/tools/bin/../lib/gcc/arm-none-eabi/11.3.1/../../../../arm-none-eabi/bin/ld.exe: D:/STMicro/STM32Cube/IDE_1.14/STM32CubeIDE/plugins/com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.11.3.rel1.win32_1.1.100.202309141235/tools/bin/../lib/gcc/arm-none-eabi/11.3.1/../../../../arm-none-eabi/lib/thumb/v6-m/nofp\libc_nano.a(libc_a-writer.o): in function `_write_r':
(.text._write_r+0x10): warning: _write is not implemented and will always fail

How do I get rid of these errors?  An older project does not generate these errors.

[Olivier GALLIEN]

Hi @Robert Ritchey 

Can you please elaborate on which STM32 you are working and explain differences between "old" and "new" project ?

I notice you are using an old CubeIDE 1.14 and maybe some compatibility issues may come with recent firmware package. 

Olivier 

[Robert Ritchey]

I started a new project in the last month and these errors started showing up.  By old project, I mean a project that I did last year that I recompiled, and the errors did not show up. I tried IDE 18.0 and the same errors showed up.  I looked all through my code and could not find any reference to a library that might contain file functions.  I generated a listing file and looked all through it and could not find any references to the functions I am getting errors for. I cannot figure out why I am getting warnings (and errors under 18.0) for these file functions. 

[Andrew Neil]

You've posted this under MPUs - did you mean to post under MCUs?

These aren't errors - they're just warnings.

They're just telling you that the runtime library has no support for _close_r, _lseek_r, _read_r, and _write_r

These are all file operations so, in many (most?) embedded MCU projects, none of it matters - and can be safely ignored.

IME, it is normal behaviour that these are given once only on the very first build of a project.

https://community.st.com/t5/stm32-mcus-embedded-software/x-cube-eeprom-example-projects-do-not-seem-to-work/m-p/641361/highlight/true#M45531

[Robert Ritchey]

Yes, I meant to post it under MCUs.  Sorry.  I know they are warnings under IDE14.1 but they become errors under IDE 18.0 which is why I am running 14.1.  They show up every build, not just the first time it is built.  Since they are errors under 18.0 I cannot upgrade.  

[Andrew Neil]

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@Robert Ritchey wrote:

Yes, I meant to post it under MCUs.  Sorry.  .  

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OK - moved.

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@Robert Ritchey wrote:

I know they are warnings under IDE14.1 but they become errors under IDE 18.0  

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Do they actually become errors, or is 1.18.0 just configured to treat warnings as errors?

If the latter, you should be able to override that?

[Andrew Neil · Accepted solution]

Does your project contain a syscalls.c ?

That should implement these functions

[Robert Ritchey]

They are actual errors under 18.0 but I have not gone in to see how the linker is configured.

[Robert Ritchey]

No, syscall.c is not in the build