6 files changed, 28 insertions, 2 deletions
diff --git a/lld/ELF/Config.h b/lld/ELF/Config.h
index b2c107ce485..1144b2fa159 100644
--- a/lld/ELF/Config.h
+++ b/lld/ELF/Config.h
@@ -30,7 +30,7 @@ enum ELFKind {
   ELF64BEKind
 };
 
-enum class BuildIdKind { None, Fnv1, Md5, Sha1, Hexstring };
+enum class BuildIdKind { None, Fnv1, Md5, Sha1, Hexstring, Uuid };
 
 enum class UnresolvedPolicy { NoUndef, Error, Warn, Ignore };
 
diff --git a/lld/ELF/Driver.cpp b/lld/ELF/Driver.cpp
index 451b2e49eab..89d5bb51163 100644
--- a/lld/ELF/Driver.cpp
+++ b/lld/ELF/Driver.cpp
@@ -450,6 +450,8 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
       Config->BuildId = BuildIdKind::Md5;
     } else if (S == "sha1") {
       Config->BuildId = BuildIdKind::Sha1;
+    } else if (S == "uuid") {
+      Config->BuildId = BuildIdKind::Uuid;
     } else if (S == "none") {
       Config->BuildId = BuildIdKind::None;
     } else if (S.startswith("0x")) {
diff --git a/lld/ELF/OutputSections.cpp b/lld/ELF/OutputSections.cpp
index 2631ccc5760..6fdaf2d24ce 100644
--- a/lld/ELF/OutputSections.cpp
+++ b/lld/ELF/OutputSections.cpp
@@ -19,7 +19,7 @@
 #include "llvm/Support/MD5.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/SHA1.h"
-#include <map>
+#include "llvm/Support/RandomNumberGenerator.h"
 
 using namespace llvm;
 using namespace llvm::dwarf;
@@ -1681,6 +1681,12 @@ void BuildIdSha1<ELFT>::writeBuildId(ArrayRef<ArrayRef<uint8_t>> Bufs) {
 }
 
 template <class ELFT>
+void BuildIdUuid<ELFT>::writeBuildId(ArrayRef<ArrayRef<uint8_t>> Bufs) {
+  if (getRandomBytes(this->HashBuf, 16))
+    error("entropy source failure");
+}
+
+template <class ELFT>
 BuildIdHexstring<ELFT>::BuildIdHexstring()
     : BuildIdSection<ELFT>(Config->BuildIdVector.size()) {}
 
@@ -1994,6 +2000,11 @@ template class BuildIdSha1<ELF32BE>;
 template class BuildIdSha1<ELF64LE>;
 template class BuildIdSha1<ELF64BE>;
 
+template class BuildIdUuid<ELF32LE>;
+template class BuildIdUuid<ELF32BE>;
+template class BuildIdUuid<ELF64LE>;
+template class BuildIdUuid<ELF64BE>;
+
 template class BuildIdHexstring<ELF32LE>;
 template class BuildIdHexstring<ELF32BE>;
 template class BuildIdHexstring<ELF64LE>;
diff --git a/lld/ELF/OutputSections.h b/lld/ELF/OutputSections.h
index 9af207b9182..213a5211717 100644
--- a/lld/ELF/OutputSections.h
+++ b/lld/ELF/OutputSections.h
@@ -727,6 +727,12 @@ public:
   void writeBuildId(ArrayRef<ArrayRef<uint8_t>> Bufs) override;
 };
 
+template <class ELFT> class BuildIdUuid final : public BuildIdSection<ELFT> {
+public:
+  BuildIdUuid() : BuildIdSection<ELFT>(16) {}
+  void writeBuildId(ArrayRef<ArrayRef<uint8_t>> Bufs) override;
+};
+
 template <class ELFT>
 class BuildIdHexstring final : public BuildIdSection<ELFT> {
 public:
diff --git a/lld/ELF/Writer.cpp b/lld/ELF/Writer.cpp
index 4469944792b..ba0e6dd6423 100644
--- a/lld/ELF/Writer.cpp
+++ b/lld/ELF/Writer.cpp
@@ -156,6 +156,8 @@ template <class ELFT> void elf::writeResult() {
     BuildId.reset(new BuildIdMd5<ELFT>);
   else if (Config->BuildId == BuildIdKind::Sha1)
     BuildId.reset(new BuildIdSha1<ELFT>);
+  else if (Config->BuildId == BuildIdKind::Uuid)
+    BuildId.reset(new BuildIdUuid<ELFT>);
   else if (Config->BuildId == BuildIdKind::Hexstring)
     BuildId.reset(new BuildIdHexstring<ELFT>);
 
diff --git a/lld/test/ELF/build-id.s b/lld/test/ELF/build-id.s
index f1eac42812b..6f832d53667 100644
--- a/lld/test/ELF/build-id.s
+++ b/lld/test/ELF/build-id.s
@@ -7,6 +7,8 @@
 # RUN: llvm-objdump -s %t2 | FileCheck -check-prefix=MD5 %s
 # RUN: ld.lld --build-id=sha1 %t -o %t2
 # RUN: llvm-objdump -s %t2 | FileCheck -check-prefix=SHA1 %s
+# RUN: ld.lld --build-id=uuid %t -o %t2
+# RUN: llvm-objdump -s %t2 | FileCheck -check-prefix=UUID %s
 # RUN: ld.lld --build-id=0x12345678 %t -o %t2
 # RUN: llvm-objdump -s %t2 | FileCheck -check-prefix=HEX %s
 # RUN: ld.lld %t -o %t2
@@ -31,6 +33,9 @@ _start:
 # SHA1:      Contents of section .note.gnu.build-id:
 # SHA1-NEXT: 04000000 14000000 03000000 474e5500  ............GNU.
 
+# UUID:      Contents of section .note.gnu.build-id:
+# UUID-NEXT: 04000000 10000000 03000000 474e5500  ............GNU.
+
 # HEX:      Contents of section .note.gnu.build-id:
 # HEX-NEXT: 04000000 04000000 03000000 474e5500  ............GNU.
 # HEX-NEXT: 12345678