[clang] [llvm] [llvm] Add triples for managarm (PR #87845)

[Fangrui Song via cfe-commits]

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@@ -395,6 +395,36 @@ class LLVM_LIBRARY_VISIBILITY LinuxTargetInfo : public OSTargetInfo<Target> {
   }
 };
 
+// Managarm Target
+template <typename Target>
+class LLVM_LIBRARY_VISIBILITY ManagarmTargetInfo : public OSTargetInfo<Target> {
+protected:
+  void getOSDefines(const LangOptions &Opts, const llvm::Triple &Triple,
+                    MacroBuilder &Builder) const override {
+    DefineStd(Builder, "unix", Opts);
+    Builder.defineMacro("__managarm__");
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MaskRay wrote:

We need a clang/test/Preprocessor test. You might want to do that in a separate PR and add some regular Clang maintainers.

https://github.com/llvm/llvm-project/pull/87845