[clang] [llvm] Add ifunc support for Windows on AArch64. (PR #111962)

[Martin Storsjö via cfe-commits]

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@@ -1505,6 +1505,10 @@ class TargetInfo : public TransferrableTargetInfo,
   bool supportsIFunc() const {
     if (getTriple().isOSBinFormatMachO())
       return true;
+    if (getTriple().isOSWindows() && getTriple().isAArch64())
+      return true;
+    if (getTriple().getArch() == llvm::Triple::ArchType::avr)
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mstorsjo wrote:

I noted the same, but it seems it's intentional.

One of the existing tests use ifuncs for an `avr-unknown-unknown` target (which is OS-less). Previously, ifunc was accepted for any `TargetELFOrMachO`, which I guess was true for `avr-unknown-unknown`. But now it's only accepted for targets that are accepted by the `supportsIFunc()` method, which only accept a few specific OSes on ELF.

On the other hand, it doesn't seem consistent, that for baremetal, ifunc is supported depending on the architecture - but this is needed to keep the existing tests passing at least.

https://github.com/llvm/llvm-project/pull/111962