[Bug target/114543] New: mcmodel=kernel generates relocation that definitely can't be handled

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114543

            Bug ID: 114543
           Summary: mcmodel=kernel generates relocation that definitely
                    can't be handled
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: link-failure
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---
            Target: x86_64-linux-gnu

Take:
```
const char *f()
{
  return "1" + 2147483647;
}
int main() {}
```

Compile/link with `-O2 mcmodel=kernel` and you get:
```
ASM generation compiler returned: 0
/tmp/cc57BgGX.o: in function `f()':
example.cpp:(.text+0x3): relocation truncated to fit: R_X86_64_32S against
`.LC0'
collect2: error: ld returned 1 exit status
Execution build compiler returned: 1
```

That is because GCC Produces:
```
        movq    $.LC0+2147483647, %rax
```

But it should have split up the addon from the LC0 here.

Note that was reported in PR 91420 originally but that is a riscv64 backend
issue rather than one in the x86_64 backend.