[llvm-dev] Setting a function in a module to extern

[Gaier, Bjoern via llvm-dev]

Hello,

Finally I was able to test the suggestion of deleting the body. So I did:
                     mainModue->getFunction("?hello_worldEx@@YAHXZ")->setLinkage(llvm::GlobalValue::LinkageTypes::ExternalLinkage);
                     mainModue->getFunction("?hello_worldEx@@YAHXZ")->deleteBody();

Wit the result, that the function “hello_worldEx” disappeared completely – it was not set to an external function which I could resolve again.
“setLinkage” seems not to influence the code at all
“deleteBody” deletes the functions but also all calls to it…

So what can I do?

Kind greetings
Björn

From: Philip Pfaffe <philip.pfaffe at gmail.com>
Sent: Donnerstag, 13. Dezember 2018 15:01
To: Gaier, Bjoern <Bjoern.Gaier at horiba.com>
Cc: Boldizsar.Palotas at esa.int; llvm-dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] Setting a function in a module to extern

You need to delete the body of the function then.

Cheers,
Philip

On Thu, Dec 13, 2018 at 2:30 PM Gaier, Bjoern via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
But in my module this function already exist… I first want to delete it but without also deleting the calls to it…


From: Boldizsar.Palotas at esa.int<mailto:Boldizsar.Palotas at esa.int> <Boldizsar.Palotas at esa.int<mailto:Boldizsar.Palotas at esa.int>>
Sent: Donnerstag, 13. Dezember 2018 10:53
To: Gaier, Bjoern <Bjoern.Gaier at horiba.com<mailto:Bjoern.Gaier at horiba.com>>
Cc: LLVM Developers Mailing List <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>>
Subject: Re: [llvm-dev] Setting a function in a module to extern

I think you just need to llvm::Function::Create(Type, Linkage, Name, Module) it and not add any basic blocks to it.

Boldizsár Palotás



From:        "Gaier, Bjoern via llvm-dev" <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>>
To:        LLVM Developers Mailing List <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>>
Date:        2018.12.13 08:14
Subject:        [llvm-dev] Setting a function in a module to extern
Sent by:        "llvm-dev" <llvm-dev-bounces at lists.llvm.org<mailto:llvm-dev-bounces at lists.llvm.org>>
________________________________


Hello again,



as mentioned in a different mail, I’m a beginner with the LLVM and writing a JIT-Client under Windows.



In my llvm::Module I have a certain function – now I want to delete this function, but keep all the calls and references to it. I kind of want to set the function to an external function.

Is this possible?



Kind greetings

Björn

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