[clang] [PowerPC] Support -mno-red-zone option (PR #94581)

[Qiu Chaofan via cfe-commits]

https://github.com/ecnelises created https://github.com/llvm/llvm-project/pull/94581

None

>From 4e078099d8e15fd984ef38435d6f792bbb3d754c Mon Sep 17 00:00:00 2001
From: Qiu Chaofan <qiucofan at cn.ibm.com>
Date: Thu, 6 Jun 2024 14:06:48 +0800
Subject: [PATCH] [PowerPC] Support -mno-red-zone option

---
 clang/lib/Driver/ToolChains/Clang.cpp | 3 +++
 clang/test/Driver/flags.c             | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 4e1c52462e584..3a37c05c8b44b 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -2022,6 +2022,9 @@ void Clang::AddPPCTargetArgs(const ArgList &Args,
     CmdArgs.push_back("-mabi=vec-extabi");
   }
 
+  if (!Args.hasFlag(options::OPT_mred_zone, options::OPT_mno_red_zone, true))
+    CmdArgs.push_back("-disable-red-zone");
+
   ppc::FloatABI FloatABI = ppc::getPPCFloatABI(D, Args);
   if (FloatABI == ppc::FloatABI::Soft) {
     // Floating point operations and argument passing are soft.
diff --git a/clang/test/Driver/flags.c b/clang/test/Driver/flags.c
index 16b760609c36d..7d2bef63fca3e 100644
--- a/clang/test/Driver/flags.c
+++ b/clang/test/Driver/flags.c
@@ -33,3 +33,6 @@
 //
 // RUN: %clang --target=riscv64 -### -S -mno-implicit-float %s 2>&1 | FileCheck -check-prefix=TEST11 %s
 // TEST11: "-no-implicit-float"
+//
+// RUN: %clang --target=ppc64le -### -S -mno-red-zone %s 2>&1 | FileCheck -check-prefix=TEST12 %s
+// TEST12: "-disable-red-zone"