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From: "rdiezmail-gcc at yahoo dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/100446] GDB has problems reading GCC's debugging info
 level -g3
Date: Thu, 06 May 2021 11:43:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100446

--- Comment #3 from R. Diez <rdiezmail-gcc at yahoo dot de> ---
Regarding "shifting the blame", no worries, I am grateful for any help.

I suspect that there is more than 1 issue here. Could you take a look at the
following aspect mentioned in the GDB bug?

----8<----8<----

In fact, I do not understand why StartOfUserCode is not defined in the rele=
ase
build, because it is the same source code after all. The same routine is us=
ed
in the same way.

I dumped all symbols like this and I compared them:

arm-none-eabi-objdump  --syms  firmware-debug-non-lto.elf
arm-none-eabi-objdump  --syms  firmware-release-lto.elf

----8<----8<----

That particular symbol, StartOfUserCode, among many others, should be in the
release build too. And there is no GDB involved there at all.

I have not got experience with clang or lldb at all, and I have read that l=
ldb
is not ready yet for debugging bare metal firmware (at least off the shelf)=
.=