[LLVMdev] LLVM linkage flags (original) (raw)

Dave Bozier seifsta at gmail.com
Fri Jul 24 11:28:13 PDT 2015

It's no longer a tentative definition because you have initialized it. Doesn't matter what it has been initialized to i don't think...

On Fri, Jul 24, 2015 at 6:24 PM, Max Ruttenberg <mruttenberg at emutechnology.com> wrote:

An enumeration for the kinds of linkage for global values.

Hi, I'm currently writing a compiler that takes llvm-ir input. I'm a little confused by the following linkage flags:

Enumerator:

ExternalLinkage: Externally visible function AvailableExternallyLinkage: Available for inspection, not emission. LinkOnceAnyLinkage: Keep one copy of function when linking (inline) LinkOnceODRLinkage: Same, but only replaced by something equivalent. WeakAnyLinkage: Keep one copy of named function when linking (weak) WeakODRLinkage: Same, but only replaced by something equivalent. AppendingLinkage: Special purpose, only applies to global arrays. InternalLinkage: Rename collisions when linking (static functions). PrivateLinkage: Like Internal, but omit from symbol table. ExternalWeakLinkage: ExternalWeak linkage description. CommonLinkage: Tentative definitions. When I have source code like: int x = 0; int main(){...} I end up with an ExternalLinkage flag on x. Why would this not have CommonLinkage? When I have the same code as above and don't initialize x, I end up with the CommonLinkage flag. Any insight would be appreciated. Best, M.R.

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