[clang] The real option name and not the alias used is displayed in msgs when using a config file (PR #107613)

[Sean Perry via cfe-commits]

https://github.com/perry-ca created https://github.com/llvm/llvm-project/pull/107613

An example of this is the -mpure-code option.  Without a config file being used, an error message will print `-mpure-code`.  But if a config file is used, the error message will print `-mexecute-only`. 

>From 27f31954976948e4e0d194db5da6bc550b4c2200 Mon Sep 17 00:00:00 2001
From: Sean Perry <perry at ca.ibm.com>
Date: Fri, 6 Sep 2024 10:54:07 -0500
Subject: [PATCH] clone the alias option too

---
 clang/lib/Driver/Driver.cpp          | 11 +++++++++++
 clang/test/Driver/arm-execute-only.c |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 5b3783e20eabba..e4604f4e3ea753 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -998,6 +998,17 @@ static void appendOneArg(InputArgList &Args, const Arg *Opt,
   Copy->setOwnsValues(Opt->getOwnsValues());
   Opt->setOwnsValues(false);
   Args.append(Copy);
+  if (Opt->getAlias()) {
+    const Arg *Alias = Opt->getAlias();
+    unsigned Index = Args.MakeIndex(Alias->getSpelling());
+    auto AliasCopy = std::make_unique<Arg>(Alias->getOption(), Args.getArgString(Index),
+                                 Index, BaseArg);
+    AliasCopy->getValues() = Alias->getValues();
+    AliasCopy->setOwnsValues(false);
+    if (Alias->isClaimed())
+      AliasCopy->claim();
+    Copy->setAlias(std::move(AliasCopy));
+  }
 }
 
 bool Driver::readConfigFile(StringRef FileName,
diff --git a/clang/test/Driver/arm-execute-only.c b/clang/test/Driver/arm-execute-only.c
index a9bf1656fd27e5..d654ec364a87f5 100644
--- a/clang/test/Driver/arm-execute-only.c
+++ b/clang/test/Driver/arm-execute-only.c
@@ -19,6 +19,9 @@
 
 // RUN: not %clang -### --target=arm-arm-none-eabi -march=armv8-m.main -mpure-code -mno-movt %s 2>&1 \
 // RUN:    | FileCheck %s -check-prefix CHECK-PURE-CODE-NO-MOVT
+// RUN: echo "-DABC"  > %t.cfg
+// RUN: not %clang -### --target=arm-arm-none-eabi -march=armv8-m.main -mpure-code -mno-movt --config %t.cfg %s 2>&1 \
+// RUN:    | FileCheck %s -check-prefix CHECK-PURE-CODE-NO-MOVT
 // CHECK-PURE-CODE-NO-MOVT: error: option '-mpure-code' cannot be specified with '-mno-movt'
 
 // RUN: not %clang -### --target=arm-arm-none-eabi -march=armv6-m -mexecute-only -fropi %s 2>&1 \