[llvm-dev] Zero-sized globals in LLVM IR

[Bruce Hoult via llvm-dev]

I believe C says you can't have one. Every variable must have a distinct
address. I don't know what LLVM IR says, but you could maybe insert an asm
label.


On Tue, Jul 17, 2018 at 3:58 AM, David Chisnall via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hello the list,
>
> What is the correct type for a global of size zero?  I need the compiler
> to be able to generate one, so that the linker will insert it at a specific
> position without perturbing the location of anything else in the section.
> I have tried a zero-length array (generates something at least one byte).
> At Nuno’s suggestion, I tried a structure with no fields.  In release
> builds, this works correctly, but in debug builds it triggers an assertion
> that the type must be sized.
>
> What is the recommended way of doing this?
>
> David
>
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