<br>Nice! Thanks for the tip, Devang. That helped.<br><br>Bharadwaj<br><br><div class="gmail_quote">On Wed, Mar 4, 2009 at 4:46 PM, Devang Patel <span dir="ltr"><<a href="mailto:dpatel@apple.com">dpatel@apple.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div style=""><br><div><div class="im"><div>On Mar 4, 2009, at 1:33 PM, S. Bharadwaj Yadavalli wrote:</div>
<br><blockquote type="cite">Hi Duncan,<br><br>Thanks for your reply.<br><br>I did try the method suggested by you. I got a foo.bc with -emit-llvm switch. llc on foo.bc gets me the same assertion failure, as you pointed out. <br>
<br>Then I ran bugpoint to generate bugpoint-reduced-simplified.bc and bugpoint-reduced-function.bc. My previous experience is that if I compile either if them, I would get the same failure as I did with foo.bc. That is not the case. I get a different assertion failure when I compile either of them with llc which is as follows:<br>
<br>llc: <llvm-src>/llvm/lib/CodeGen/AsmPrinter/DwarfWriter.cpp:2808: void llvm::DwarfDebug::ConstructCompileUnits(): Assertion `Root->hasLinkOnceLinkage() && Root->hasOneUse() && "Malformed compile unit descriptor anchor type"' failed.</blockquote>
<div><br></div></div>This is because bugpoint tool does not understand debug info intrinsics.</div><div>To avoid this, when you generate foo.bc with -emit-llvm switch, do not use -g on the llvm-gcc command line.</div><div>
<br></div><div>-</div><div>Devang</div><div><br></div><div><blockquote type="cite"><div><div></div><div class="h5"><br> <br>This makes it hard for me to easily create a test case and submit a bug report.<br><br>Hence, I thought I should take this opportunity to delve deeper into LLVM and look at this issue.<br>
<br>Any further nudges / help is highly appreciated!<br> <br>Thanks,<br><br>Bharadwaj<br><br><div class="gmail_quote">On Wed, Mar 4, 2009 at 3:59 PM, Duncan Sands <span dir="ltr"><<a href="mailto:baldrick@free.fr" target="_blank">baldrick@free.fr</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Hi Bharadwaj,<br> <div><br> > I get the following error during compilation using the LLVM cross-compiler<br>
> (x86_64->arm).<br> ><br> > error: nested functions are disabled, use -fnested-functions to re-enable<br> <br> </div>yes, nested functions are disabled by default in llvm-gcc (not sure why -<br> maybe a historical hang over from the days when they were not supported?).<br>
<div><br> > With -fnested-functions switch, I get the following error:<br> ><br> > <llvm-src-dir>/llvm/lib/Target/ARM/ARMISelLowering.cpp:1439: virtual<br> > llvm::SDValue llvm::ARMTargetLowering::LowerOperation(llvm::SDValue,<br>
> llvm::SelectionDAG&): Assertion `0 && "Don't know how to custom lower<br> > this!"' failed.<br> > frobos/tests/hello.c:453: internal compiler error: Aborted<br> > Please submit a full bug report,<br>
> with preprocessed source if appropriate.<br> > See <URL:<a href="http://developer.apple.com/bugreporter" target="_blank">http://developer.apple.com/bugreporter</a>> for instructions.<br> ><br> > I'd like to investigate this but am wondering if anyone has any<br>
> thoughts/suggestions in this area.<br> <br> </div>I don't know anything about cross-compiling, but the usual way<br> to debug this kind of thing is to re-run by hand the line that<br> caused this assertion, but adding -emit-llvm to the command line.<br>
The output will then contain LLVM bitcode. If you are lucky,<br> then running llc on the bitcode will give the same assertion<br> failure. If so, then "bugpoint --run-llc the_bit_code" should<br> automatically reduce a minimal testcase.<br>
<br> Ciao,<br> <font color="#888888"><br> Duncan.<br> </font></blockquote></div><br></div></div> _______________________________________________<br>LLVM Developers mailing list<br><a href="mailto:LLVMdev@cs.uiuc.edu" target="_blank">LLVMdev@cs.uiuc.edu</a> <a href="http://llvm.cs.uiuc.edu" target="_blank">http://llvm.cs.uiuc.edu</a><br>
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<div>-</div><div>Devang</div><div><br></div></div></span><br> </div><br></div><br>_______________________________________________<br>
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