From ed6a129534dd018d21c91542aac61b4b835d6aa8 Mon Sep 17 00:00:00 2001
From: ShashwathiNavada <shashwathinavada@gmail.com>
Date: Wed, 29 Jan 2025 09:23:35 -0600
Subject: [PATCH] Adding diagnostics for unsupported option

---
 clang/lib/Frontend/CompilerInvocation.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 8411217be8c8a..3a743c324c90b 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -1897,6 +1897,15 @@ bool CompilerInvocation::ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args,
     Opts.setInlining(CodeGenOptions::NormalInlining);
   }
 
+// -mcmodel option.
+if (const llvm::opt::Arg *A = Args.getLastArg(clang::driver::options::OPT_mcmodel_EQ)) 
+{
+    llvm::StringRef modelName = A->getValue();
+    if(modelName=="tiny" && !T.isARM())
+      Diags.Report(diag::err_drv_unsupported_option_argument_for_target) 
+              << A->getSpelling() <<modelName<< T.getTriple();  
+}
+
   // PIC defaults to -fno-direct-access-external-data while non-PIC defaults to
   // -fdirect-access-external-data.
   Opts.DirectAccessExternalData =