[Bug target/68178] [arm] Relative address expressions bind at as-time, even if symbol is weak

[rearnsha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68178

Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:

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

--- Comment #3 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
This is an assembler bug and it only affects ARM state (thumb2 is OK).

In Thumb2 code we get:

00000000 <foo>:
   0:   4770            bx      lr
   2:   bf00            nop

00000004 <bar>:
   4:   4801            ldr     r0, [pc, #4]    ; (c <bar+0x8>)
   6:   4478            add     r0, pc
   8:   4770            bx      lr
   a:   bf00            nop
   c:   00000002        .word   0x00000002
                        c: R_ARM_REL32  foo

While in ARM code we get:

00000000 <foo>:
   0:   e12fff1e        bx      lr

00000004 <bar>:
   4:   e59f0004        ldr     r0, [pc, #4]    ; 10 <bar+0xc>
   8:   e08f0000        add     r0, pc, r0
   c:   e12fff1e        bx      lr
  10:   fffffff0        .word   0xfffffff0
(no relocation generated).


even though the assembly output is equivalent.

(resolving as invalid because this isn't a GCC problem but a GAS problem).