[llvm-dev] Function name demangle on clang vs clang++

David Blaikie via llvm-dev llvm-dev at lists.llvm.org
Mon Oct 28 15:44:27 PDT 2019

This is more of a general C and C++ question than one suitable to the LLVM
discussion list, I think?

You can modify the source itself -
https://en.cppreference.com/w/cpp/language/language_linkage - discusses the
extern "C" directive and how it can be used to expose C-linkage functions
from C++ translation units (so, if you have a function with C API, but an
implementation written in C++, this is how to do that)

On Mon, Oct 28, 2019 at 3:37 PM Syed Ahmed via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi all,
> I'm a LLVM newbie and am working on a LLVM 3.5 code base. The project (
> https://github.com/zhguanw/lin-analyzer) makes use of clang and reads C
> code. I'm trying to make it read C++ code. When I compile a kernel written
> in C with clang++, I get the following difference in the IR for a function
> declaration:
> When compiled with clang:
> declare void @convolution3d(float*, float*) #1
> When compiled with clang++:
> declare void @_Z13convolution3dPfS_(float*, float*) #2
> The project breaks if I compile with clang++ because it expects the
> function name to not have the @_Z13*PfS. Does anyone know how I can get
> the function name in the IR generated by clang++ to not have the mangled
> characters? Once again, this is in LLVM 3.5.
> Best,
> Syed Ahmed
> PhD Student
> Implementation of Computation Group
> UPenn
> _______________________________________________
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> llvm-dev at lists.llvm.org
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