Index: llvm/docs/LinkTimeOptimization.rst
===================================================================
--- llvm/docs/LinkTimeOptimization.rst
+++ llvm/docs/LinkTimeOptimization.rst
@@ -249,6 +249,12 @@
 
 The attributes of a symbol include the alignment, visibility, and kind.
 
+Tools working with object files on Darwin (e.g. lipo) may need to know properties like the CPU type:
+
+.. code-block:: c
+
+  lto_module_get_macho_cputype(lto_module_t mod, unsigned int *out_cputype, unsigned int *out_cpusubtype)
+
 ``lto_code_gen_t``
 ------------------
 
Index: llvm/include/llvm-c/lto.h
===================================================================
--- llvm/include/llvm-c/lto.h
+++ llvm/include/llvm-c/lto.h
@@ -46,7 +46,7 @@
  * @{
  */
 
-#define LTO_API_VERSION 26
+#define LTO_API_VERSION 27
 
 /**
  * \since prior to LTO_API_VERSION=3
@@ -297,6 +297,21 @@
 extern const char*
 lto_module_get_linkeropts(lto_module_t mod);
 
+/**
+ * If targeting mach-o on darwin, this function gets the CPU type and subtype
+ * that will end up being encoded in the mach-o header. These are the values
+ * that can be found in mach/machine.h.
+ *
+ * \p out_cputype and \p out_cpusubtype must be non-NULL.
+ *
+ * Returns true on error (check lto_get_error_message() for details).
+ *
+ * \since LTO_API_VERSION=27
+ */
+extern lto_bool_t lto_module_get_macho_cputype(lto_module_t mod,
+                                               unsigned int *out_cputype,
+                                               unsigned int *out_cpusubtype);
+
 /**
  * Diagnostic severity.
  *
Index: llvm/include/llvm/LTO/legacy/LTOModule.h
===================================================================
--- llvm/include/llvm/LTO/legacy/LTOModule.h
+++ llvm/include/llvm/LTO/legacy/LTOModule.h
@@ -165,6 +165,10 @@
 
   static const char *getDependentLibrary(lto::InputFile *input, size_t index, size_t *size);
 
+  Expected<uint32_t> getMachOCPUType() const;
+
+  Expected<uint32_t> getMachOCPUSubType() const;
+
 private:
   /// Parse metadata from the module
   // FIXME: it only parses "llvm.linker.options" metadata at the moment
Index: llvm/lib/LTO/LTOModule.cpp
===================================================================
--- llvm/lib/LTO/LTOModule.cpp
+++ llvm/lib/LTO/LTOModule.cpp
@@ -28,6 +28,7 @@
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/MC/SubtargetFeature.h"
 #include "llvm/Object/IRObjectFile.h"
+#include "llvm/Object/MachO.h"
 #include "llvm/Object/ObjectFile.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Host.h"
@@ -676,3 +677,11 @@
   *size = S.size();
   return S.data();
 }
+
+Expected<uint32_t> LTOModule::getMachOCPUType() const {
+  return MachO::getCPUType(Triple(Mod->getTargetTriple()));
+}
+
+Expected<uint32_t> LTOModule::getMachOCPUSubType() const {
+  return MachO::getCPUSubType(Triple(Mod->getTargetTriple()));
+}
Index: llvm/tools/lto/lto.cpp
===================================================================
--- llvm/tools/lto/lto.cpp
+++ llvm/tools/lto/lto.cpp
@@ -327,6 +327,27 @@
   return unwrap(mod)->getLinkerOpts().data();
 }
 
+lto_bool_t lto_module_get_macho_cputype(lto_module_t mod,
+                                        unsigned int *out_cputype,
+                                        unsigned int *out_cpusubtype) {
+  LTOModule *M = unwrap(mod);
+  Expected<uint32_t> CPUType = M->getMachOCPUType();
+  if (!CPUType) {
+    sLastErrorString = toString(CPUType.takeError());
+    return true;
+  }
+  *out_cputype = *CPUType;
+
+  Expected<uint32_t> CPUSubType = M->getMachOCPUSubType();
+  if (!CPUSubType) {
+    sLastErrorString = toString(CPUSubType.takeError());
+    return true;
+  }
+  *out_cpusubtype = *CPUSubType;
+
+  return false;
+}
+
 void lto_codegen_set_diagnostic_handler(lto_code_gen_t cg,
                                         lto_diagnostic_handler_t diag_handler,
                                         void *ctxt) {
Index: llvm/tools/lto/lto.exports
===================================================================
--- llvm/tools/lto/lto.exports
+++ llvm/tools/lto/lto.exports
@@ -9,6 +9,7 @@
 lto_module_create_in_local_context
 lto_module_create_in_codegen_context
 lto_module_get_linkeropts
+lto_module_get_macho_cputype
 lto_module_get_num_symbols
 lto_module_get_symbol_attribute
 lto_module_get_symbol_name