[clang] Bump the DWARF version number to 5 on Darwin. (PR #95164)

[Adrian Prantl via cfe-commits]

https://github.com/adrian-prantl created https://github.com/llvm/llvm-project/pull/95164

rdar://110925733

>From bdc0c661ca59ce1cddbc1615a3e640d2943c9c28 Mon Sep 17 00:00:00 2001
From: Adrian Prantl <aprantl at apple.com>
Date: Tue, 11 Jun 2024 11:04:00 -0700
Subject: [PATCH] Bump the DWARF version number to 5 on Darwin.

rdar://110925733
---
 clang/lib/Driver/ToolChains/Darwin.cpp | 12 +++++++++++-
 clang/test/Driver/debug-options.c      | 27 +++++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index ed5737915aa96..04e411eeeac92 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1257,7 +1257,17 @@ unsigned DarwinClang::GetDefaultDwarfVersion() const {
   if ((isTargetMacOSBased() && isMacosxVersionLT(10, 11)) ||
       (isTargetIOSBased() && isIPhoneOSVersionLT(9)))
     return 2;
-  return 4;
+  // Default to use DWARF 4 on OS X 10.11 - macOS 14 / iOS - iOS 17.
+  if ((isTargetMacOSBased() && isMacosxVersionLT(15)) ||
+      (isTargetIOSBased() && isIPhoneOSVersionLT(18)) ||
+      (isTargetWatchOSBased() && TargetVersion < llvm::VersionTuple(11)) ||
+      (isTargetXROS() && TargetVersion < llvm::VersionTuple(2)) ||
+      (isTargetDriverKit() && TargetVersion < llvm::VersionTuple(24)) ||
+      (isTargetMacOSBased() &&
+       TargetVersion.empty()) || // apple-darwin, no version.
+      (TargetPlatform == llvm::Triple::BridgeOS))
+    return 4;
+  return 5;
 }
 
 void MachO::AddLinkRuntimeLib(const ArgList &Args, ArgStringList &CmdArgs,
diff --git a/clang/test/Driver/debug-options.c b/clang/test/Driver/debug-options.c
index 07f6ca9e3902f..0a665f7017d63 100644
--- a/clang/test/Driver/debug-options.c
+++ b/clang/test/Driver/debug-options.c
@@ -68,7 +68,32 @@
 // RUN: %clang -### -c -g %s -target x86_64-apple-driverkit19.0 2>&1 \
 // RUN:             | FileCheck -check-prefix=G_STANDALONE \
 // RUN:                         -check-prefix=G_DWARF4 %s
-// RUN: %clang -### -c -fsave-optimization-record %s \
+// RUN: %clang -### -c -g %s -target x86_64-apple-macosx15 2>&1 \
+// RUN:             | FileCheck -check-prefix=G_STANDALONE \
+// RUN:                         -check-prefix=G_DWARF5 %s
+// RUN: %clang -### -c -g %s -target arm64-apple-ios17.0 2>&1 \
+// RUN:             | FileCheck -check-prefix=G_STANDALONE \
+// RUN:                         -check-prefix=G_DWARF4 %s
+// RUN: %clang -### -c -g %s -target arm64-apple-ios18.0 2>&1 \
+// RUN:             | FileCheck -check-prefix=G_STANDALONE \
+// RUN:                         -check-prefix=G_DWARF5 %s
+// RUN: %clang -### -c -g %s -target arm64_32-apple-watchos11 2>&1 \
+// RUN:             | FileCheck -check-prefix=G_STANDALONE \
+// RUN:                         -check-prefix=G_DWARF5 %s
+// RUN: %clang -### -c -g %s -target arm64-apple-tvos18.0 2>&1 \
+// RUN:             | FileCheck -check-prefix=G_STANDALONE \
+// RUN:                         -check-prefix=G_DWARF5 %s
+// RUN: %clang -### -c -g %s -target x86_64-apple-driverkit24.0 2>&1 \
+// RUN:             | FileCheck -check-prefix=G_STANDALONE \
+// RUN:                         -check-prefix=G_DWARF5 %s
+// RUN: %clang -### -c -g %s -target arm64-apple-xros1 2>&1 \
+// RUN:             | FileCheck -check-prefix=G_STANDALONE \
+// RUN:                         -check-prefix=G_DWARF4 %s
+// RUN: %clang -### -c -g %s -target arm64-apple-xros2 2>&1 \
+// RUN:             | FileCheck -check-prefix=G_STANDALONE \
+// RUN:                         -check-prefix=G_DWARF5 %s
+//
+// RUN: %clang -### -c -fsave-optimization-record %s    \
 // RUN:        -target x86_64-apple-darwin 2>&1 \
 // RUN:             | FileCheck -check-prefix=GLTO_ONLY %s
 // RUN: %clang -### -c -g -fsave-optimization-record %s \