[LLVMbugs] [Bug 19647] New: accepts invalid

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Sat May 3 12:17:22 PDT 2014


            Bug ID: 19647
           Summary: accepts invalid
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: MC
          Assignee: unassignedbugs at nondot.org
          Reporter: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

MC currently accepts

    zed = foo +2
    call zed at PLT

but there is no way to represent that in ELF if foo is undefined. What is being
requested is that (on x86_64):

* we produce a R_X86_64_PLT32 with and addend of -4 to a PLT location.
* That the plt entry in turn should refer to foo+2.

It is the second part that cannot be represented. The entry will always just
refer to a symbol and there is no way to define a symbol that is some undefined
symbol + 2.

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