Add @[Linkage("value")] annotation (applies to fun)
#15426
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The annotation can be specified on fun definitions (with a body). Incidently it can also be specified to extern fun in lib declarations (without a body) in which case LLVM may only accept a few values (external, weak). The linkage is only set during codegen when `--single-module` is set, since otherwise it would prevent any module from calling funs that are always declared in the `main` module.
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It would be nice to have a spec for this. This should be quite trivial: Build a binary which includes a fun with |
straight-shoota
approved these changes
Feb 7, 2025
straight-shoota
approved these changes
Feb 7, 2025
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I added a spec that checks if the linkage as been correctly set on the LLVM bitcode. That only tests the intended behavior, not that the linked binary behaves as expected, but it avoids having to find alternatives to |
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Declares a new compiler annotation,
Linkage, that may take one of the following values:"external"—the symbol is referenced in the object file and is visible to all symbols from all object files (this is the default)."internal"—the symbol will be referenced in the object file, but is only visible to symbols within that object only.The annotation can only be specified on
fundefinitions (with a body). Incidentally it can also be specified to externfuninlibdeclarations (without a body), though the only value accepted by LLVM will beexternaland a few other values (not implemented).I chose to limit the possible values, and not expose all values from
LLVM::Linkage. We should have a proper discussion about adding more. For example we might consider theweakvalue in a future development, but we'll need to correctly define what we mean with "weak" linkage (there are multiple definitions).Related to #921