The following is rejected by gas:

.intel_syntax noprefix
mov     rax, QWORD PTR __CTOR_END__-8[rip]

These equivalent instructions are accepted by gas as expected:
mov     rax, QWORD PTR __CTOR_END__+-8[rip]
mov     rax, QWORD PTR -8+__CTOR_END__[rip]
mov     rax, QWORD PTR __CTOR_END__[rip-8]

Ofcourse the variant that gas rejects is the one which GCC emits. :-(

-- 
           Summary: Error: `QWORD PTR __CTOR_END__-8[rip]' is not a valid
                    base/index expression
           Product: binutils
           Version: 2.19 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: rask at sygehus dot dk
                CC: bug-binutils at gnu dot org
GCC target triplet: x86_64-unknown-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=5034

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