[flang] [llvm] [flang] Add HOSTNM runtime and lowering intrinsics implementation (PR #131910)

[via llvm-commits]

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@@ -4317,6 +4321,37 @@ void IntrinsicLibrary::genGetEnvironmentVariable(
   }
 }
 
+// HOSTNM
+fir::ExtendedValue
+IntrinsicLibrary::genHostnm(std::optional<mlir::Type> resultType,
+                            llvm::ArrayRef<fir::ExtendedValue> args) {
+  assert((args.size() == 1 && resultType.has_value()) ||
+         (args.size() >= 1 && !resultType.has_value()));
+
+  mlir::Value res = fir::getBase(args[0]);
+  mlir::Value statusValue = fir::runtime::genHostnm(builder, loc, res);
+
+  if (resultType.has_value()) {
+    // Function form, return status.
+    return statusValue;
+  } else {
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jeanPerier wrote:

Nit:  lowering/mlir code follows LLVM coding style that advise to not use `else` after an if with return.
See https://llvm.org/docs/CodingStandards.html#don-t-use-else-after-a-return 

https://github.com/llvm/llvm-project/pull/131910