RTEMS | powerpc/motorola_powerpc BSPs build bootloader with -msoft-float (#4443)

[YASH BHIWANIA (@Yash)]

YASH BHIWANIA commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/4443#note_139104


> This appears to be an ABI mismatch in the motorola_powerpc bootloader build.
>
> The bootloader is currently compiled with `-msoft-float`, while applications are built with hard-float (and the motorola_powerpc BSPs target CPUs with an FPU). With newer binutils, mixing soft-float and hard-float objects is now a link-time error rather than a warning, which likely explains why this did not show up with older RTEMS/toolchain combinations.
>
> Removing `-msoft-float` alone is not sufficient, as the bootloader is also built with `-mrelocatable`. This produces objects that the linker will not merge with normally compiled application objects.
>
> Replacing `-mrelocatable` with `-mrelocatable-lib` for both C and assembly flags keeps the bootloader relocatable while remaining link-compatible with standard application binaries. With this change, the application links cleanly into a bootable image.
>
> I have not yet been able to validate this on real hardware, but from a toolchain and ABI perspective the change appears correct and aligns the bootloader flags with the rest of the BSP.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/4443#note_139104
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