[llvm] [RISCV] Add basic Mach-O triple support. (PR #141682)

[Jessica Clarke via llvm-commits]

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@@ -156,6 +156,9 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeRISCVTarget() {
 static StringRef computeDataLayout(const Triple &TT,
                                    const TargetOptions &Options) {
   StringRef ABIName = Options.MCOptions.getABIName();
+  if (TT.isOSBinFormatMachO())
+    return "e-m:o-p:32:32-i64:64-n32-S128";
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jrtc27 wrote:

This assumes RV32, and non-ilp32e at that. Can we not parameterise all the existing cases with the mangling? Or, if they really must diverge, at least assert it's 32-bit and not ilp32e?

https://github.com/llvm/llvm-project/pull/141682