[LLVMbugs] [Bug 13025] New: Undefined reference to alloca when using bitcode

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13025

             Bug #: 13025
           Summary: Undefined reference to alloca when using bitcode
           Product: dragonegg
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: New Bugs
        AssignedTo: baldrick at free.fr
        ReportedBy: scott+llvm+bugzilla at pakin.org
                CC: llvmbugs at cs.uiuc.edu, scott+llvm+bugzilla at pakin.org
    Classification: Unclassified


Created attachment 8682
  --> http://llvm.org/bugs/attachment.cgi?id=8682
Reproducer that can't compile with DragonEgg to bitcode then link with Clang

I'm compiling with DragonEgg into bitcode (well, ASCII bitcode) then linking
the result with Clang.  The problem is that variable-sized arrays lead to
"undefined reference to `alloca'" errors, as the attached reproducer
demonstrates.

    $ g++ -fplugin=/home/pakin/llvm/lib/dragonegg.so
-fplugin-arg-dragonegg-emit-ir -S -o badlink.ll badlink.cc
    $ clang++ -o badlink badlink.ll
    /tmp/badlink-dgcsTw.o: In function `main':
    badlink.ll:(.text+0x54): undefined reference to `alloca'
    clang: error: linker command failed with exit code 1 (use -v to see
invocation)

A pure Clang workflow (i.e., no DragonEgg) has no problems, though:

    $ clang++ -emit-llvm -S -o badlink.ll badlink.cc
    $ clang++ -o badlink badlink.ll

-- Scott

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