Ominous linker messages when using platform blackpillv2

[erazor-de]

What I did:

git clone git@github.com:blackmagic-debug/blackmagic.git
cd blackmagic
git submodule update --init --recursive
make PROBE_HOST=blackpillv2

HEAD was at 19d9111 and the actual gcc-arm-none-eabi-12.2.mpacbti-bet1 compiler from ARM was used on Linux.

These commands resulted in the following linker warnings:

/home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/bin/ld: /home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(libc_a-closer.o): in function `_close_r':
/data/jenkins/workspace/GNU-toolchain/arm-12-mpacbti/src/newlib-cygwin/newlib/libc/reent/closer.c:47: warning: _close is not implemented and will always fail
/home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/bin/ld: /home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(libc_a-signalr.o): in function `_getpid_r':
/data/jenkins/workspace/GNU-toolchain/arm-12-mpacbti/src/newlib-cygwin/newlib/libc/reent/signalr.c:83: warning: _getpid is not implemented and will always fail
/home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/bin/ld: /home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(libc_a-signalr.o): in function `_kill_r':
/data/jenkins/workspace/GNU-toolchain/arm-12-mpacbti/src/newlib-cygwin/newlib/libc/reent/signalr.c:53: warning: _kill is not implemented and will always fail
/home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/bin/ld: /home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(libc_a-lseekr.o): in function `_lseek_r':
/data/jenkins/workspace/GNU-toolchain/arm-12-mpacbti/src/newlib-cygwin/newlib/libc/reent/lseekr.c:49: warning: _lseek is not implemented and will always fail
/home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/bin/ld: /home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(libc_a-readr.o): in function `_read_r':
/data/jenkins/workspace/GNU-toolchain/arm-12-mpacbti/src/newlib-cygwin/newlib/libc/reent/readr.c:49: warning: _read is not implemented and will always fail
/home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/bin/ld: /home/stefan/opt/gcc-arm-none-eabi-12.2.mpacbti-bet1/bin/../lib/gcc/arm-none-eabi/12.2.0/../../../../arm-none-eabi/lib/thumb/v7e-m+fp/hard/libc.a(libc_a-writer.o): in function `_write_r':
/data/jenkins/workspace/GNU-toolchain/arm-12-mpacbti/src/newlib-cygwin/newlib/libc/reent/writer.c:49: warning: _write is not implemented and will always fail

I don't have my ordered BlackPill yet so I can't test but linker warnings regarding newlib-cygwin make me suspicious. Is this supposedly so?

[dragonmux]

Ack, accidentally duplicated this issue with #1363.

The short version is that we know about those, it shouldn't impact on the firmware working but it does need fixing longer-term. Closing this in favour of the other owing to the notes we've made for ourself on the other issue. Expect a fix in v1.10.