Revert "Bump the DWARF version number to 5 on Darwin."

[fmayer]

Reverts #95164

This broke a buildbot: https://lab.llvm.org/buildbot/#/builders/37/builds/35987

[llvmbot]

@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clang-driver

Author: Florian Mayer (fmayer)

Changes

Reverts llvm/llvm-project#95164

This broke a buildbot: https://lab.llvm.org/buildbot/#/builders/37/builds/35987

---

Full diff: https://github.com/llvm/llvm-project/pull/95325.diff

2 Files Affected:

• (modified) clang/lib/Driver/ToolChains/Darwin.cpp (+1-11)
• (modified) clang/test/Driver/debug-options.c (+1-26)

diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index ca75a622b061e..ed5737915aa96 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1257,17 +1257,7 @@ unsigned DarwinClang::GetDefaultDwarfVersion() const {
   if ((isTargetMacOSBased() && isMacosxVersionLT(10, 11)) ||
       (isTargetIOSBased() && isIPhoneOSVersionLT(9)))
     return 2;
-  // Default to use DWARF 4 on OS X 10.11 - macOS 14 / iOS 9 - 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;
+  return 4;
 }
 
 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 0a665f7017d63..07f6ca9e3902f 100644
--- a/clang/test/Driver/debug-options.c
+++ b/clang/test/Driver/debug-options.c
@@ -68,32 +68,7 @@
 // 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 -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: %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 \