[llvm-branch-commits] [ARM, MC] Support FDPIC relocations (PR #82187)

[Peter Smith via llvm-branch-commits]

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@@ -84,6 +84,11 @@ unsigned ARMELFObjectWriter::GetRelocTypeInner(const MCValue &Target,
   if (Kind >= FirstLiteralRelocationKind)
     return Kind - FirstLiteralRelocationKind;
   MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
+  auto CheckFDPIC = [&]() {
+    if (getOSABI() != ELF::ELFOSABI_ARM_FDPIC)
+      Ctx.reportError(Fixup.getLoc(),
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smithp35 wrote:

I think the error message could be improved by giving out the string representation of the relocation code. For example:
```relocation R_ARM_FUNCDESC only supported in FDPIC mode```. I think this should be relatively easy to add.

https://github.com/llvm/llvm-project/pull/82187