Hello Nicolò,
This is definitely a bug that I encountered today. I'm convinced it's a bug because I came across this page that says so: https://newlib.sourceware.narkive.com/kfT8XDEe/building-libc-nano-and-libg-nano The git repo it links to has the following shell function. I think we should emulate its behavior. (On a slightly unrelated note, can someone PLEASE accept my patch in bug 44750 for a different arm-none-eabi issue. It's desperately needed.) copyNanoLibraries() { ( source="${1}" destination="${2}" messageA "\"nano\" libraries copy" multilibs=$("${destination}/bin/${target}-gcc" -print-multi-lib) sourcePrefix="${source}/${target}/lib" destinationPrefix="${destination}/${target}/lib" for multilib in ${multilibs}; do multilib="${multilib%%;*}" sourceDirectory="${sourcePrefix}/${multilib}" destinationDirectory="${destinationPrefix}/${multilib}" mkdir -p "${destinationDirectory}" cp "${sourceDirectory}/libc.a" "${destinationDirectory}/libc_nano.a" cp "${sourceDirectory}/libg.a" "${destinationDirectory}/libg_nano.a" cp "${sourceDirectory}/librdimon.a" "${destinationDirectory}/librdimon_nano.a" cp "${sourceDirectory}/libstdc++.a" "${destinationDirectory}/libstdc++_nano.a" cp "${sourceDirectory}/libsupc++.a" "${destinationDirectory}/libsupc++_nano.a" done mkdir -p "${destination}/${target}/include/newlib-nano" cp "${source}/${target}/include/newlib.h" "${destination}/${target}/include/newlib-nano" if [ "${keepBuildFolders}" = "n" ]; then messageB "\"nano\" libraries remove install folder" maybeDelete "${top}/${buildNative}/${nanoLibraries}" fi ) }