Sudden increase in flash usage (~40kB) after Zephyr update

[sajimon]

Hello,
I am developing application using c/c++ mix, for a time of development im tracing main repository and updating Zephyr from time to time. This update I stumped upon a problem I can't figure out, after adjusting all the code to latest version my flash usage increased by 40kB for no apparent reason. I've excluded some potential culprits like external modules, compared autoconf.h old and new, stuff like that.
Updated to: 3.2.99 27ec69e
Updated from: 3.1.99 ae7f349
Both build on Zephyr SDK 0.15.1

Finally, when I was comparing west build reports (memory map) I noticed bunch of new low-level functions that were not there before
00017630 T _Unwind_Backtrace
00017630 T _Unwind_Backtrace
00017424 t _Unwind_Complete
000174f8 T _Unwind_DeleteException
000175d0 T _Unwind_FindEnclosingFunction
0001773c T _Unwind_Find_FDE
000177a8 T _Unwind_GetCFA
00017530 T _Unwind_GetDataRelBase
00017828 T _Unwind_GetGR
00017894 T _Unwind_GetIP
000177cc T _Unwind_GetIPInfo
000174a0 T _Unwind_GetLanguageSpecificData
000174cc T _Unwind_GetRegionStart
00017580 T _Unwind_GetTextRelBase
000171d4 T _Unwind_RaiseException
00017428 T _Unwind_Resume
0001752c T _Unwind_Resume_or_Rethrow
00017860 T _Unwind_SetGR
000178d0 T _Unwind_SetIP
00016c58 T _Unwind_VRS_Get
00016794 t _Unwind_VRS_Interpret
00016e2 t _Unwind_VRS_Pop
00016d40 T _Unwind_VRS_Set

And plenty of other with "exception" in name or other exception-suggesting names.
Some googling pointed me to c++ exceptions, but I have CONFIG_EXCEPTIONS=n and confirmed all .cpp files are build with -fno-exceptions.

Does anyone have any idea what maybe pulling those functions in or suggestions what to check next?

[sajimon]

Hello, after bisecting for better part of the day I pinned this issue down to commit 28b22b2 which disables Newlib Nano by default.
However interesting part is that newlib.rst says that if HAS_NEWLIB_LIBC_NANO=y then NEWLIB_LIBC_NANO should be selected by default. This is not happening for me.