diff --git a/clang/lib/Driver/ToolChains/Haiku.h b/clang/lib/Driver/ToolChains/Haiku.h
--- a/clang/lib/Driver/ToolChains/Haiku.h
+++ b/clang/lib/Driver/ToolChains/Haiku.h
@@ -22,6 +22,8 @@
   Haiku(const Driver &D, const llvm::Triple &Triple,
           const llvm::opt::ArgList &Args);
 
+  bool IsMathErrnoDefault() const override { return false; }
+  bool IsObjCNonFragileABIDefault() const override { return true; }
   bool isPICDefault() const override { return true; }
 
   void AddClangSystemIncludeArgs(
@@ -33,6 +35,10 @@
   void addLibStdCxxIncludePaths(
       const llvm::opt::ArgList &DriverArgs,
       llvm::opt::ArgStringList &CC1Args) const override;
+
+  unsigned GetDefaultDwarfVersion() const override { return 4; }
+
+  bool GetDefaultStandaloneDebug() const override { return true; }
 };
 
 } // end namespace toolchains
diff --git a/clang/test/CodeGen/dwarf-version.c b/clang/test/CodeGen/dwarf-version.c
--- a/clang/test/CodeGen/dwarf-version.c
+++ b/clang/test/CodeGen/dwarf-version.c
@@ -14,6 +14,7 @@
 // RUN: %clang -target x86_64-apple-darwin14 -g -S -emit-llvm -o - %s -isysroot %t | FileCheck %s --check-prefix=VER2
 
 // RUN: %clang -target powerpc-unknown-openbsd -g -S -emit-llvm -o - %s | FileCheck %s --check-prefix=VER2
+// RUN: %clang --target=x86_64-unknown-haiku -g -S -emit-llvm -o - %s | FileCheck %s --check-prefix=VER4
 // RUN: %clang -target powerpc-unknown-freebsd -g -S -emit-llvm -o - %s | FileCheck %s --check-prefix=VER4
 
 // Check which debug info formats we use on Windows. By default, in an MSVC
diff --git a/clang/test/Driver/clang-g-opts.c b/clang/test/Driver/clang-g-opts.c
--- a/clang/test/Driver/clang-g-opts.c
+++ b/clang/test/Driver/clang-g-opts.c
@@ -9,6 +9,8 @@
 // RUN:             | FileCheck --check-prefix=CHECK-WITH-G-DWARF2 %s
 // RUN: %clang -### -S %s -g -target x86_64-pc-freebsd10.0 2>&1 \
 // RUN:             | FileCheck --check-prefix=CHECK-WITH-G-DWARF2 %s
+// RUN: %clang -### -S %s -g --target=x86_64-unknown-haiku 2>&1 \
+// RUN:             | FileCheck --check-prefix=CHECK-WITH-G-DWARF4 %s
 
 // 'g0' is the default. Just basic correctness check that it does nothing
 // RUN: %clang -### -S %s -g0    2>&1 | FileCheck --check-prefix=CHECK-WITHOUT-G %s
@@ -27,12 +29,15 @@
 // RUN:             | FileCheck --check-prefix=CHECK-WITH-G-DWARF2 %s
 // RUN: %clang -### -S %s -g0 -g -target x86_64-pc-freebsd10.0 2>&1 \
 // RUN:             | FileCheck --check-prefix=CHECK-WITH-G-DWARF2 %s
+// RUN: %clang -### -S %s -g0 -g --target=x86_64-unknown-haiku 2>&1 \
+// RUN:             | FileCheck --check-prefix=CHECK-WITH-G-DWARF4 %s
 // RUN: %clang -### -S %s -g0 -g --target=i386-pc-solaris 2>&1 \
 // RUN:             | FileCheck --check-prefix=CHECK-WITH-G %s
 
 // CHECK-WITHOUT-G-NOT: -debug-info-kind
 // CHECK-WITH-G: "-debug-info-kind=constructor"
 // CHECK-WITH-G: "-dwarf-version=5"
+// CHECK-WITH-G-DWARF4: "-dwarf-version=4"
 // CHECK-WITH-G-DWARF2: "-dwarf-version=2"
 
 // CHECK-WITH-G-STANDALONE: "-debug-info-kind=standalone"
diff --git a/clang/test/Driver/debug-options.c b/clang/test/Driver/debug-options.c
--- a/clang/test/Driver/debug-options.c
+++ b/clang/test/Driver/debug-options.c
@@ -83,6 +83,11 @@
 // RUN:             | FileCheck -check-prefix=G_GDB \
 // RUN:                         -check-prefix=G_DWARF4 %s
 
+// Haiku.
+// RUN: %clang -### -c -g %s --target=x86_64-unknown-haiku 2>&1 \
+// RUN:             | FileCheck -check-prefix=G_STANDALONE \
+// RUN:                         -check-prefix=G_DWARF4 %s
+
 // Windows.
 // RUN: %clang -### -c -g %s -target x86_64-w64-windows-gnu 2>&1 \
 // RUN:             | FileCheck -check-prefix=G_GDB %s
diff --git a/clang/test/Driver/fast-math.c b/clang/test/Driver/fast-math.c
--- a/clang/test/Driver/fast-math.c
+++ b/clang/test/Driver/fast-math.c
@@ -122,6 +122,8 @@
 // RUN:   | FileCheck --check-prefix=CHECK-NO-MATH-ERRNO %s
 // RUN: %clang -### -target x86_64-unknown-openbsd -c %s 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NO-MATH-ERRNO %s
+// RUN: %clang -### --target=x86_64-unknown-haiku -c %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-NO-MATH-ERRNO %s
 // RUN: %clang -### -target x86_64-unknown-dragonfly -c %s 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NO-MATH-ERRNO %s
 // RUN: %clang -### -target x86_64-fuchsia -c %s 2>&1 \