Error in LLGO installation

[Akshansh Chahal]

Hi,

I was following this : http://llvm.org/svn/llvm-project/llgo/trunk/README.TXT for installing llgo.

All the steps were successfully completed except the last one, where I have to do  "make install".

It ran till 92% progress successfully, and gave me this error :

[ 92%] Building Go executable llgo

# llvm.org/llvm/bindings/go/llvm

could not determine kind of name for C.LLVMAddAttribute

could not determine kind of name for C.LLVMAddInstrAttribute

could not determine kind of name for C.LLVMAlignment

could not determine kind of name for C.LLVMAlwaysInlineAttribute

could not determine kind of name for C.LLVMAttribute

could not determine kind of name for C.LLVMByValAttribute

could not determine kind of name for C.LLVMGetAttribute

could not determine kind of name for C.LLVMInRegAttribute

could not determine kind of name for C.LLVMInlineHintAttribute

could not determine kind of name for C.LLVMNakedAttribute

could not determine kind of name for C.LLVMNestAttribute

could not determine kind of name for C.LLVMNoAliasAttribute

could not determine kind of name for C.LLVMNoCaptureAttribute

could not determine kind of name for C.LLVMNoImplicitFloatAttribute

could not determine kind of name for C.LLVMNoInlineAttribute

could not determine kind of name for C.LLVMNoRedZoneAttribute

could not determine kind of name for C.LLVMNoReturnAttribute

could not determine kind of name for C.LLVMNoUnwindAttribute

could not determine kind of name for C.LLVMOptimizeForSizeAttribute

could not determine kind of name for C.LLVMReadNoneAttribute

could not determine kind of name for C.LLVMReadOnlyAttribute

could not determine kind of name for C.LLVMRemoveAttribute

could not determine kind of name for C.LLVMRemoveInstrAttribute

could not determine kind of name for C.LLVMReturnsTwice

could not determine kind of name for C.LLVMSExtAttribute

could not determine kind of name for C.LLVMStackAlignment

could not determine kind of name for C.LLVMStackProtectAttribute

could not determine kind of name for C.LLVMStackProtectReqAttribute

could not determine kind of name for C.LLVMStructRetAttribute

could not determine kind of name for C.LLVMUWTable

could not determine kind of name for C.LLVMZExtAttribute

tools/llgo/CMakeFiles/llgo.dir/build.make:220: recipe for target 'bin/llgo' failed

make[2]: *** [bin/llgo] Error 1

CMakeFiles/Makefile2:51075: recipe for target 'tools/llgo/CMakeFiles/llgo.dir/all' failed

make[1]: *** [tools/llgo/CMakeFiles/llgo.dir/all] Error 2

Makefile:149: recipe for target 'all' failed

make: *** [all] Error 2

How to resolve this ?

Any help is appreciated.

Thank you

Akshansh

[Akshansh Chahal]

I am using latest ubuntu and latest Go version installed.

[Andrew Wilkins]

The build is currently broken for everyone. There have been various changes recently to the LLVM bindings, but no matching update to llgo. Feel free to send a patch if you're interested in fixing it. There is a new Docker image if you just want to play (see recent message from Mohsen). Otherwise, when I or someone else has time, we'll get onto it.

Cheers,

Andrew

Thank you

Akshansh

[Akshansh Chahal]

Thanks Andrew for the information.

I basically want a Control Flow Graph for any given GO program for a project I am working on. So I was planning to get LLVM-IR from LLGO and then CFG from LLVM-IR.

Do you know any other simple way to get a CFG for a GO program.

Also if I pull that Docker Image, will I be able to get LLVM-IR from it. What command should I use for llvm-ir ?

Cheers,

Akshansh

[Andrew Wilkins]

On Wed, 30 Nov 2016 at 16:23 Akshansh Chahal <akshans...@gmail.com> wrote:

Thanks Andrew for the information.

I basically want a Control Flow Graph for any given GO program for a project I am working on. So I was planning to get LLVM-IR from LLGO and then CFG from LLVM-IR.

Do you know any other simple way to get a CFG for a GO program.

Using llgo for that is probably a bit overkill. You could just use go/ssa directly. See: https://godoc.org/golang.org/x/tools/go/ssa#BasicBlock. You can get the CFG from the BB preds/succs.

 

Also if I pull that Docker Image, will I be able to get LLVM-IR from it. What command should I use for llvm-ir ?

It has the llgo compiler in it, so yes. e.g.

    llgo -emit-llvm -S -o - /path/to/main.go

(-emit-llvm to generate bitcode/IR, -S to produce textual IR rather than bitcode)

 

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[Akshansh Chahal]

Thanks a lot Andrew for such a quick and informative response. I would try out the other option you suggested using go/ssa.

[Akshansh Chahal]

Hi Andrew,

If you can help with this problem, whenever you are free. I am not sure how to get any starting node of type BasicBlock (ssa#BasicBlock), so that I can traverse the Graph using Preds/Succs relation.

I am able to get ssa/program (ssa#Program) for a given .go file by using packages ssautil, parser, token and functions ParseFile(), CreateProgram() etc.

I took some help from here example_test.go

But how to get any node of type BasicBlock from that ssa.Program I have ?

Thanks

Akshansh

[Andrew Wilkins]

It appears that Alan Donovan has answered your question on golang-nuts. I don't have anything to add over what he wrote.

Cheers, Andrew

[Akshansh Chahal]

Yes, he has.

Cheers, Akshansh