candle-usb/candleLight_fw

build warning: "_close is not implemented and will always fail"

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fenugrec commented

Nice, new warnings with arm-gcc 13.1.0 :

/usr/lib/gcc/arm-none-eabi/13.1.0/../../../../arm-none-eabi/bin/ld: /usr/lib/gcc/arm-none-eabi/13.1.0/../../../../arm-none-eabi/lib/thumb/v7e-m/nofp/libg_nano.a(libc_a-closer.o): in function `_close_r':
/build/arm-none-eabi-newlib/src/build-nano/arm-none-eabi/thumb/v7e-m/nofp/newlib/../../../../../../newlib-4.3.0.20230120/newlib/libc/reent/closer.c:47: warning: _close is not implemented and will always fail
/usr/lib/gcc/arm-none-eabi/13.1.0/../../../../arm-none-eabi/bin/ld: /usr/lib/gcc/arm-none-eabi/13.1.0/../../../../arm-none-eabi/lib/thumb/v7e-m/nofp/libg_nano.a(libc_a-lseekr.o): in function `_lseek_r':
/build/arm-none-eabi-newlib/src/build-nano/arm-none-eabi/thumb/v7e-m/nofp/newlib/../../../../../../newlib-4.3.0.20230120/newlib/libc/reent/lseekr.c:49: warning: _lseek is not implemented and will always fail
/usr/lib/gcc/arm-none-eabi/13.1.0/../../../../arm-none-eabi/bin/ld: /usr/lib/gcc/arm-none-eabi/13.1.0/../../../../arm-none-eabi/lib/thumb/v7e-m/nofp/libg_nano.a(libc_a-readr.o): in function `_read_r':
/build/arm-none-eabi-newlib/src/build-nano/arm-none-eabi/thumb/v7e-m/nofp/newlib/../../../../../../newlib-4.3.0.20230120/newlib/libc/reent/readr.c:49: warning: _read is not implemented and will always fail
/usr/lib/gcc/arm-none-eabi/13.1.0/../../../../arm-none-eabi/bin/ld: /usr/lib/gcc/arm-none-eabi/13.1.0/../../../../arm-none-eabi/lib/thumb/v7e-m/nofp/libg_nano.a(libc_a-writer.o): in function `_write_r':
/build/arm-none-eabi-newlib/src/build-nano/arm-none-eabi/thumb/v7e-m/nofp/newlib/../../../../../../newlib-4.3.0.20230120/newlib/libc/reent/writer.c:49: warning: _write is not implemented and will always fail

those are neither implemented nor used. I'm not sure which step is pulling in those symbols; none of them end up in the compiled .elf.
Is it my distro's build that got something wrong all of a sudden or is anyone else also seeing this ?

ryedwards commented

The STMCUBEMX HAL added a "syscalls.c" to stub out these functions to prevent compiler errors:
https://github.com/ryedwards/budgetcan_fw/blob/main/Core/Src/syscalls.c

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