[clang] [Driver][UEFI] Enable Microsoft extensions (PR #121875)

[via cfe-commits]

https://github.com/Prabhuk updated https://github.com/llvm/llvm-project/pull/121875

>From d0377d33aabebca99f806eaa38e4f5683787c42a Mon Sep 17 00:00:00 2001
From: prabhukr <prabhukr at google.com>
Date: Mon, 6 Jan 2025 18:30:19 -0800
Subject: [PATCH 1/2] [Driver][UEFI] Enable Microsoft extensions

Enable microsoft extensions for UEFI targets.
---
 clang/lib/Driver/ToolChains/Clang.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index a0002371da2f1b..03fdd92e00e316 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -5109,6 +5109,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   const llvm::Triple *AuxTriple =
       (IsCuda || IsHIP) ? TC.getAuxTriple() : nullptr;
   bool IsWindowsMSVC = RawTriple.isWindowsMSVCEnvironment();
+  bool IsUEFI = RawTriple.isUEFI();
   bool IsIAMCU = RawTriple.isOSIAMCU();
 
   // Adjust IsWindowsXYZ for CUDA/HIP/SYCL compilations.  Even when compiling in
@@ -7252,7 +7253,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
 
   // -fms-extensions=0 is default.
   if (Args.hasFlag(options::OPT_fms_extensions, options::OPT_fno_ms_extensions,
-                   IsWindowsMSVC))
+                   IsWindowsMSVC || IsUEFI))
     CmdArgs.push_back("-fms-extensions");
 
   // -fms-compatibility=0 is default.

>From d9a06b0d3c5c296fadeffcc93623863fbee2b080 Mon Sep 17 00:00:00 2001
From: prabhukr <prabhukr at google.com>
Date: Wed, 8 Jan 2025 10:10:23 -0800
Subject: [PATCH 2/2] Add a test.

---
 clang/test/Driver/uefi-constructed-args.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/clang/test/Driver/uefi-constructed-args.c b/clang/test/Driver/uefi-constructed-args.c
index e90857bb6fb5b8..3cc5abe6974539 100644
--- a/clang/test/Driver/uefi-constructed-args.c
+++ b/clang/test/Driver/uefi-constructed-args.c
@@ -4,6 +4,7 @@
 // CHECK-SAME: "-triple" "x86_64-unknown-uefi"
 // CHECK-SAME: "-mrelocation-model" "pic" "-pic-level" "2"
 // CHECK-SAME: "-mframe-pointer=all"
+// CHECK-SAME: "-fms-extensions"
 // CHECK-NEXT: "-nologo"
 // CHECK-SAME: "-subsystem:efi_application"
 // CHECK-SAME: "-entry:EfiMain"