[LLVMbugs] [Bug 9245] New: error in backend: expected assembly-time absolute expression

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9245

           Summary: error in backend: expected assembly-time absolute
                    expression
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nicholas at mxc.ca
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=6176)
 --> (http://llvm.org/bugs/attachment.cgi?id=6176)
testcase

The linux kernel (2.6.38-rc5) doesn't build because of a problem in llvm-mc and
the BUG() macro which is used throughout.

Please see the C testcase attached. It triggers easily:

$ clang y.c -c -o y.o
fatal error: error in backend: expected assembly-time absolute expression

while having clang emit a .s file and then using GAS to assemble it works fine.
However:

  $ clang y.c -S -o y.s
  $ llvm-mc -assemble y.s -filetype=obj
  LLVM ERROR: expected assembly-time absolute expression

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