diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -682,9 +682,10 @@
   }
 
   if (Retain) {
-    if ((Ctx.getAsmInfo()->useIntegratedAssembler() ||
-         Ctx.getAsmInfo()->binutilsIsAtLeast(2, 36)) &&
-        !TM.getTargetTriple().isOSSolaris())
+    if (TM.getTargetTriple().isOSSolaris())
+      Flags |= ELF::SHF_SUNW_NODISCARD;
+    else if (Ctx.getAsmInfo()->useIntegratedAssembler() ||
+             Ctx.getAsmInfo()->binutilsIsAtLeast(2, 36))
       Flags |= ELF::SHF_GNU_RETAIN;
     return NextUniqueID++;
   }
@@ -861,12 +862,15 @@
     EmitUniqueSection = true;
     Flags |= ELF::SHF_LINK_ORDER;
   }
-  if (Retain &&
-      (Ctx.getAsmInfo()->useIntegratedAssembler() ||
-       Ctx.getAsmInfo()->binutilsIsAtLeast(2, 36)) &&
-      !TM.getTargetTriple().isOSSolaris()) {
-    EmitUniqueSection = true;
-    Flags |= ELF::SHF_GNU_RETAIN;
+  if (Retain) {
+    if (TM.getTargetTriple().isOSSolaris()) {
+      EmitUniqueSection = true;
+      Flags |= ELF::SHF_SUNW_NODISCARD;
+    } else if (Ctx.getAsmInfo()->useIntegratedAssembler() ||
+               Ctx.getAsmInfo()->binutilsIsAtLeast(2, 36)) {
+      EmitUniqueSection = true;
+      Flags |= ELF::SHF_GNU_RETAIN;
+    }
   }
 
   MCSectionELF *Section = selectELFSectionForGlobal(
diff --git a/llvm/lib/MC/MCParser/ELFAsmParser.cpp b/llvm/lib/MC/MCParser/ELFAsmParser.cpp
--- a/llvm/lib/MC/MCParser/ELFAsmParser.cpp
+++ b/llvm/lib/MC/MCParser/ELFAsmParser.cpp
@@ -282,7 +282,8 @@
   return false;
 }
 
-static unsigned parseSectionFlags(StringRef flagsStr, bool *UseLastGroup) {
+static unsigned parseSectionFlags(const Triple &TT, StringRef flagsStr,
+                                  bool *UseLastGroup) {
   unsigned flags = 0;
 
   // If a valid numerical value is set for the section flag, use it verbatim
@@ -331,7 +332,10 @@
       flags |= ELF::SHF_GROUP;
       break;
     case 'R':
-      flags |= ELF::SHF_GNU_RETAIN;
+      if (TT.isOSSolaris())
+        flags |= ELF::SHF_SUNW_NODISCARD;
+      else
+        flags |= ELF::SHF_GNU_RETAIN;
       break;
     case '?':
       *UseLastGroup = true;
@@ -569,7 +573,8 @@
     } else {
       StringRef FlagsStr = getTok().getStringContents();
       Lex();
-      extraFlags = parseSectionFlags(FlagsStr, &UseLastGroup);
+      extraFlags = parseSectionFlags(getContext().getTargetTriple(), FlagsStr,
+                                     &UseLastGroup);
     }
 
     if (extraFlags == -1U)
diff --git a/llvm/lib/MC/MCSectionELF.cpp b/llvm/lib/MC/MCSectionELF.cpp
--- a/llvm/lib/MC/MCSectionELF.cpp
+++ b/llvm/lib/MC/MCSectionELF.cpp
@@ -105,6 +105,11 @@
   if (Flags & ELF::SHF_GNU_RETAIN)
     OS << 'R';
 
+  // If there are os-specific flags, print them.
+  if (T.isOSSolaris())
+    if (Flags & ELF::SHF_SUNW_NODISCARD)
+      OS << 'R';
+
   // If there are target-specific flags, print them.
   Triple::ArchType Arch = T.getArch();
   if (Arch == Triple::xcore) {
diff --git a/llvm/test/CodeGen/X86/elf-retain.ll b/llvm/test/CodeGen/X86/elf-retain.ll
--- a/llvm/test/CodeGen/X86/elf-retain.ll
+++ b/llvm/test/CodeGen/X86/elf-retain.ll
@@ -3,6 +3,8 @@
 ; RUN: llc -mtriple=x86_64 -data-sections=1 < %s | FileCheck %s
 ; RUN: llc -mtriple=x86_64 -no-integrated-as -binutils-version=2.36 < %s | FileCheck %s
 ; RUN: llc -mtriple=x86_64 -no-integrated-as -binutils-version=2.35 < %s | FileCheck %s --check-prefix=OLDGAS
+;; Solaris uses the equivalent SHF_SUNW_NODISCARD flag, also represented as "R".
+; RUN: llc -mtriple=x86_64-solaris < %s | FileCheck %s
 
 ; RUN: llc -mtriple=x86_64 -data-sections=1 -unique-section-names=0 < %s | FileCheck %s --check-prefix=NOUNIQUE
 
diff --git a/llvm/test/MC/ELF/section-gnu.s b/llvm/test/MC/ELF/section-gnu.s
--- a/llvm/test/MC/ELF/section-gnu.s
+++ b/llvm/test/MC/ELF/section-gnu.s
@@ -1,19 +1,22 @@
 # REQUIRES: aarch64-registered-target
 # RUN: llvm-mc -triple=x86_64 %s | FileCheck %s --check-prefix=ASM
-# RUN: llvm-mc -filetype=obj -triple=x86_64 %s | llvm-readobj -hS - | FileCheck %s --check-prefixes=GNU,OBJ
-# RUN: llvm-mc -filetype=obj -triple=aarch64-freebsd %s | llvm-readobj -hS - | FileCheck %s --check-prefixes=FREEBSD,OBJ
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s | llvm-readobj -hS - | FileCheck %s --check-prefixes=GNU,OBJ,OBJ-GNU
+# RUN: llvm-mc -filetype=obj -triple=aarch64-freebsd %s | llvm-readobj -hS - | FileCheck %s --check-prefixes=FREEBSD,OBJ,OBJ-GNU
+# RUN: llvm-mc -filetype=obj -triple=x86_64-solaris %s | llvm-readobj -hS - | FileCheck %s --check-prefixes=SOLARIS,OBJ,OBJ-SOLARIS
 
 # ASM: .section retain,"aR",@progbits
 
 ## ELFOSABI_NONE is changed to ELFOSABI_GNU. Other OSABI values are unchanged.
 # GNU:      OS/ABI: GNU/Linux
 # FREEBSD:  OS/ABI: FreeBSD
+# SOLARIS:  OS/ABI: Solaris
 
-# OBJ:      Name: retain
-# OBJ-NEXT: Type: SHT_PROGBITS
-# OBJ-NEXT: Flags [
-# OBJ-NEXT:   SHF_ALLOC
-# OBJ-NEXT:   SHF_GNU_RETAIN
-# OBJ-NEXT: ]
+# OBJ:              Name: retain
+# OBJ-NEXT:         Type: SHT_PROGBITS
+# OBJ-NEXT:         Flags [
+# OBJ-NEXT:           SHF_ALLOC
+# OBJ-GNU-NEXT:       SHF_GNU_RETAIN
+# OBJ-SOLARIS-NEXT:   SHF_SUNW_NODISCARD
+# OBJ-NEXT:         ]
 
 .section retain,"aR",@progbits