https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112944
--- Comment #1 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Georg-Johann Lay <g...@gcc.gnu.org>:

https://gcc.gnu.org/g:48448055fb70862ff3914f8a714ff5c4128e6ced

commit r14-7231-g48448055fb70862ff3914f8a714ff5c4128e6ced
Author: Georg-Johann Lay <a...@gjlay.de>
Date:   Thu Jan 11 22:11:25 2024 +0100

    AVR: Support .rodata in Flash for AVR64* and AVR128* Devices.

    These devices see a 32 KiB block of their program memory (flash) in
    the RAM address space.  This can be used to support .rodata in flash
    provided Binutils support PR31124 (Add new emulations which locate
    .rodata in flash).  This patch does the following:

    * configure checks availability of Binutils PR31124.

    * Add new command line options -mrodata-in-ram and -mflmap.
    While -flmap is for internal usage (communicate hardware properties
    from device-specs to the compiler proper), -mrodata-in-ram is a user
    space option that allows to return to the current rodata-in-ram layout.

    * Adjust gen-avr-mmcu-specs.cc so that device-specs are generated
    that sanity check options, and that translate -m[no-]rodata-in-ram
    to its emulation.

    * Objects in .rodata don't drag __do_copy_data.

    * Document new options and built-in macros.

            PR target/112944

    gcc/
            * configure.ac [target=avr]: Check availability of emulations
            avrxmega2_flmap and avrxmega4_flmap, resulting in new config vars
            HAVE_LD_AVR_AVRXMEGA2_FLMAP and HAVE_LD_AVR_AVRXMEGA4_FLMAP.
            * configure: Regenerate.
            * config.in: Regenerate.
            * doc/invoke.texi (AVR Options): Document -mflmap, -mrodata-in-ram,
            __AVR_HAVE_FLMAP__, __AVR_RODATA_IN_RAM__.

            * config/avr/avr.opt (-mflmap, -mrodata-in-ram): New options.
            * config/avr/avr-arch.h (enum avr_device_specific_features):
            Add AVR_ISA_FLMAP.
            * config/avr/avr-mcus.def (AVR_MCU) [avr64*, avr128*]: Set isa flag
            AVR_ISA_FLMAP.
            * config/avr/avr.cc (avr_arch_index, avr_has_rodata_p): New vars.
            (avr_set_core_architecture): Set avr_arch_index.
            (have_avrxmega2_flmap, have_avrxmega4_flmap)
            (have_avrxmega3_rodata_in_flash): Set new static const bool
according
            to configure results.
            (avr_rodata_in_flash_p): New function using them.
            (avr_asm_init_sections): Let
readonly_data_section->unnamed.callback
            track avr_need_copy_data_p only if not avr_rodata_in_flash_p().
            (avr_asm_named_section): Track avr_has_rodata_p.
            (avr_file_end): Emit __do_copy_data also when avr_has_rodata_p
            and not avr_rodata_in_flash_p ().
            * config/avr/specs.h (CC1_SPEC): Add %(cc1_rodata_in_ram).
            (LINK_SPEC): Add %(link_rodata_in_ram).
            (LINK_ARCH_SPEC): Remove.
            * config/avr/gen-avr-mmcu-specs.cc (have_avrxmega3_rodata_in_flash)
            (have_avrxmega2_flmap, have_avrxmega4_flmap): Set new static
            const bool according to configure results.
            (diagnose_mrodata_in_ram): New function.
            (print_mcu): Generate specs with the following changes:
            <*cc1_misc, *asm_misc, *link_misc>: New specs so that we don't
            need to extend avr/specs.h each time we add a new bell or whistle.
            <*cc1_rodata_in_ram, *link_rodata_in_ram>: New specs to diagnose
            -m[no-]rodata-in-ram.
            <*cpp_rodata_in_ram>: New. Does -D__AVR_RODATA_IN_RAM__=0/1.
            <*cpp_mcu>: Add -D__AVR_AVR_FLMAP__ if it applies.
            <*cpp>: Add %(cpp_rodata_in_ram).
            <*link_arch>: Use emulation avrxmega2_flmap, avrxmega4_flmap as
            requested.
            <*self_spec>: Add -mflmap or %<mflmap as needed.

    gcc/testsuite/
            * gcc.target/avr/torture/pr112944-flmap-0.c: New test.
            * gcc.target/avr/torture/pr112944-flmap-1.c: New test.

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