diff --git a/lld/MachO/Writer.cpp b/lld/MachO/Writer.cpp
--- a/lld/MachO/Writer.cpp
+++ b/lld/MachO/Writer.cpp
@@ -22,6 +22,7 @@
 #include "lld/Common/ErrorHandler.h"
 #include "lld/Common/Memory.h"
 #include "llvm/BinaryFormat/MachO.h"
+#include "llvm/Config/llvm-config.h"
 #include "llvm/Support/LEB128.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/Path.h"
@@ -248,6 +249,38 @@
   // different location.
   const StringRef path = "/usr/lib/dyld";
 };
+
+class LCBuildVersion : public LoadCommand {
+public:
+  LCBuildVersion(const PlatformInfo &platform) : platform(platform) {}
+
+  const int ntools = 1;
+
+  uint32_t getSize() const override {
+    return sizeof(build_version_command) + ntools * sizeof(build_tool_version);
+  }
+
+  void writeTo(uint8_t *buf) const override {
+    auto *c = reinterpret_cast<build_version_command *>(buf);
+    c->cmd = LC_BUILD_VERSION;
+    c->cmdsize = getSize();
+    c->platform = static_cast<uint32_t>(platform.kind);
+    c->minos = ((platform.minimum.getMajor() << 020) |
+                (platform.minimum.getMinor().getValueOr(0) << 010) |
+                platform.minimum.getSubminor().getValueOr(0));
+    c->sdk = ((platform.sdk.getMajor() << 020) |
+              (platform.sdk.getMinor().getValueOr(0) << 010) |
+              platform.sdk.getSubminor().getValueOr(0));
+    c->ntools = ntools;
+    auto *t = reinterpret_cast<build_tool_version *>(&c[1]);
+    t->tool = TOOL_LD;
+    t->version = (LLVM_VERSION_MAJOR << 020) | (LLVM_VERSION_MINOR << 010) |
+                 LLVM_VERSION_PATCH;
+  }
+
+  const PlatformInfo &platform;
+};
+
 } // namespace
 
 void Writer::scanRelocations() {
@@ -282,6 +315,8 @@
     llvm_unreachable("unhandled output file type");
   }
 
+  in.header->addLoadCommand(make<LCBuildVersion>(config->platform));
+
   uint8_t segIndex = 0;
   for (OutputSegment *seg : outputSegments) {
     in.header->addLoadCommand(make<LCSegment>(seg->name, seg));
diff --git a/lld/test/MachO/headerpad.s b/lld/test/MachO/headerpad.s
--- a/lld/test/MachO/headerpad.s
+++ b/lld/test/MachO/headerpad.s
@@ -11,8 +11,8 @@
 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %s -o %t.o
 # RUN: lld -flavor darwinnew -o %t %t.o -headerpad 0
 # RUN: llvm-objdump --macho --all-headers %t | FileCheck %s --check-prefix=PAD0
-# PAD0:      magic        cputype  cpusubtype  caps    filetype ncmds sizeofcmds
-# PAD0-NEXT: MH_MAGIC_64  X86_64   ALL         LIB64   EXECUTE  8     [[#%u, CMDSIZE:]] {{.*}}
+# PAD0:      magic        cputype  cpusubtype  caps    filetype ncmds sizeofcmds               flags
+# PAD0-NEXT: MH_MAGIC_64  X86_64   ALL         LIB64   EXECUTE  9     [[#%u, CMDSIZE:]] {{.*}}
 # PAD0:      sectname __text
 # PAD0-NEXT: segname __TEXT
 # PAD0-NEXT: addr
@@ -21,8 +21,8 @@
 
 # RUN: lld -flavor darwinnew -o %t %t.o -headerpad 11
 # RUN: llvm-objdump --macho --all-headers %t | FileCheck %s --check-prefix=PAD11
-# PAD11:      magic        cputype  cpusubtype  caps    filetype ncmds sizeofcmds
-# PAD11-NEXT: MH_MAGIC_64  X86_64   ALL         LIB64   EXECUTE  8     [[#%u, CMDSIZE:]] {{.*}}
+# PAD11:      magic        cputype  cpusubtype  caps    filetype ncmds sizeofcmds               flags
+# PAD11-NEXT: MH_MAGIC_64  X86_64   ALL         LIB64   EXECUTE  9     [[#%u, CMDSIZE:]] {{.*}}
 # PAD11:      sectname __text
 # PAD11-NEXT: segname __TEXT
 # PAD11-NEXT: addr
diff --git a/lld/test/MachO/lc-build-version.s b/lld/test/MachO/lc-build-version.s
new file mode 100644
--- /dev/null
+++ b/lld/test/MachO/lc-build-version.s
@@ -0,0 +1,21 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %s -o %t.o
+# RUN: lld -flavor darwinnew -Z -platform_version macos 10.14.1 10.15 -o %t %t.o
+# RUN: llvm-objdump --macho --all-headers %t | FileCheck %s
+
+# CHECK: Load command [[#]]
+# CHECK: cmd LC_BUILD_VERSION
+# CHECK: cmdsize 32
+# CHECK: platform macos
+# CHECK: sdk 10.15
+# CHECK: minos 10.14.1
+# CHECK: ntools 1
+# CHECK: tool ld
+# CHECK: version {{1[0-9]\.[0-9]}}
+# CHECK: Load command [[#]]
+
+.text
+.global _main
+_main:
+  mov $0, %eax
+  ret
diff --git a/lld/test/MachO/local-got.s b/lld/test/MachO/local-got.s
--- a/lld/test/MachO/local-got.s
+++ b/lld/test/MachO/local-got.s
@@ -12,12 +12,12 @@
 ## address offset and the contents at that address very similarly, so am using
 ## --match-full-lines to make sure we match on the right thing.
 # CHECK:      Contents of section __cstring:
-# CHECK-NEXT: 1000003ec {{.*}}
+# CHECK-NEXT: 10000040c {{.*}}
 
 ## 1st 8 bytes refer to the start of __cstring + 0xe, 2nd 8 bytes refer to the
 ## start of __cstring
 # CHECK:      Contents of section __got:
-# CHECK-NEXT: [[#%X,ADDR:]]  fa030000 01000000 ec030000 01000000 {{.*}}
+# CHECK-NEXT: [[#%X,ADDR:]]  1a040000 01000000 0c040000 01000000 {{.*}}
 # CHECK-NEXT: [[#ADDR + 16]] 00000000 00000000 {{.*}}
 
 ## Check that a non-locally-defined symbol is still bound at the correct offset:
diff --git a/lld/test/MachO/relocations.s b/lld/test/MachO/relocations.s
--- a/lld/test/MachO/relocations.s
+++ b/lld/test/MachO/relocations.s
@@ -19,9 +19,9 @@
 # CHECK:       leaq [[#%u, LSTR_OFF:]](%rip), %rsi
 # CHECK-NEXT:  [[#%x, CSTRING_ADDR + 22 - LSTR_OFF]]
 
-# RUN: llvm-objdump --section=__const --full-contents -d %t | FileCheck %s --check-prefix=NONPCREL
+# RUN: llvm-objdump --section=__const --full-contents %t | FileCheck %s --check-prefix=NONPCREL
 # NONPCREL:      Contents of section __const:
-# NONPCREL-NEXT: 100001000 d0030000 01000000 d0030000 01000000
+# NONPCREL-NEXT: 100001000 f0030000 01000000 f0030000 01000000
 
 .section __TEXT,__text
 .globl _main, _f