[Bug gdb/31851] GDB ignores absolute function symbols

["marian.buschsieweke at posteo dot net" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31851

--- Comment #5 from Marian Buschsieweke <marian.buschsieweke at posteo dot net> ---
This is only anecdotally relevant to the bug, but may be of interest to some
reader anyway. I figured out why the functions became absolute symbols in the
first place.

Before, I claimed:

> There is no special handling of functions that end up as absolute symbols in either the C code or the linker script.

That turns out to be incorrect, in fact, the linker script explicitly placed
functions at absolute addresses. I overlooked this because this was not part of
the linker script of the application I looked at, but done by an external
linker script [1] of the vendor SDK I wasn't aware that it was included.

I guess for providing an ABI to a pre-compiled binary blob that needs to be
loaded at a given address, the use of absolute addresses does make sense :'(

[1]:
https://github.com/espressif/esp-idf/blob/24c20d188e24c815e28351cddb838c01e7dfb241/components/esp_rom/esp32/ld/esp32.rom.newlib-funcs.ld

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