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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/107728] with -O0, libgcc in the first stage compiler
 has reference to libc functions
Date: Wed, 16 Nov 2022 22:09:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107728

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Move over, the functions are not optimized out at -O2 but rather they don't=
 get
pulled in glibc building because another function is referenced.

Either libgcc should be built with -fdata-sections -ffunction-sections or g=
libc
builds needs to be fixed such that it does not reference the function in the
unwinder at -O0.  You need to look at the linker map to figure why the obje=
ct
file is being pulled into glibc at -O0 and not at -O2.
But it is still a bug in glibc's ld.so really.=