By googling, I could download the glibc source by

git clone git://sourceware.org/git/glibc.git  

Now in our project, we are using arm64 compiler this one.

$ aarch64-none-elf-gcc --version
aarch64-none-elf-gcc (GNU Toolchain for the Arm Architecture 11.2-2022.02 (arm-11.14)) 11.2.1 20220111
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

I have this tool installed in my computer. Then how can I know the glibc version of this arm64 toolchain? (If I knew, I could debug through glibc why the printf function doesn’t lead into our _write function. This used to work the other day, but now I don’t see _write being called.. )