Richard Biener <rguenth at gcc dot> changed:

           What    |Removed                     |Added
             Status|WAITING                     |RESOLVED
         Resolution|---                         |INVALID

--- Comment #6 from Richard Biener <rguenth at gcc dot> ---
Well, if you do

 gcc -m32 -flto -c x.c

you can't simply "objcopy" that x.o file to 64bits as objcopy doesn't know
how to handle LTO bytecode.

I suppose lto-wrapper could diagnose mismatched -m32/-m64 (but those are
target flags).

The solution is to _not_ use -flto for the 32bit bootloader part.  Thus

${PREFIX}gcc -c $CFLAGS -m32 code32.c -o code32.o32 -fno-lto
${PREFIX}objcopy -O elf64-x86-64 code32.o32 code32.o

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