[llvm-dev] LLVM Kaleidoscope : Compiling to Object Code (original) (raw)

[llvm-dev] LLVM Kaleidoscope : Compiling to Object Code - Segmentation Fault

David Blaikie via llvm-dev llvm-dev at lists.llvm.org
Thu Jan 24 12:17:36 PST 2019

Hi there!

Sorry to hear you're having trouble with the examples & thanks for reaching out.

I'm having some difficulty reproducing the failure mode you described. From the code sample, it sounds like you're in Chapter 8 and I just took a look at Chapter 8 in my debug build and got this result:

$ ./bin/Kaleidoscope-Ch8 ready> def average(x y) (x + y) * 0.5; Read function definition: define double @average(double %x, double %y) { entry: %y2 = alloca double %x1 = alloca double store double %x, double* %x1 store double %y, double* %y2 %x3 = load double, double* %x1 %y4 = load double, double* %y2 %addtmp = fadd double %x3, %y4 %multmp = fmul double %addtmp, 5.000000e-01 ret double %multmp }

Any ideas what you might be doing differently that I could do to try to reproduce the failure you're seeing?

On Thu, Jan 24, 2019 at 9:36 AM preejackie via llvm-dev < llvm-dev at lists.llvm.org> wrote:

Hi all :)

I'm new to llvm! I'm going through the kaleidoscope : compiling llvm IR to object code tutorial, code in the listings breaks and causes a segmentation fault. After some investigation through gdb, probably this constructor call, causing the segfault. Program received signal SIGSEGV, Segmentation fault. 0x00000000004afee0 in llvm::optionaldetail::OptionalStorage<llvm::Reloc::Model,_ _true>::OptionalStorage(llvm::optionaldetail::OptionalStorage<llvm::Reloc::Model,_ _true> const&) () Source code: TargetOptions opt; auto RM = OptionalReloc::Model(); auto TheTargetMachine = Target->createTargetMachine(TargetTriple, CPU, Features, opt, RM); Whether this behavior is already notified and is there any workaround available for it ? I would be great to know the root cause for this behavior. Of course, the kaleidoscope is friendly and good introduction to llvm for beginners, thank you very much for developing :) Thanks for your kind help

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