Index: lib/MC/WasmObjectWriter.cpp
===================================================================
--- lib/MC/WasmObjectWriter.cpp
+++ lib/MC/WasmObjectWriter.cpp
@@ -224,6 +224,7 @@
   // Stores output data (index, relocations, content offset) for custom
   // section.
   std::vector<WasmCustomSection> CustomSections;
+  std::unique_ptr<WasmCustomSection> ProducerSection;
   // Relocations for fixing up references in the custom sections.
   DenseMap<const MCSectionWasm *, std::vector<WasmRelocationEntry>>
       CustomSectionsRelocations;
@@ -265,6 +266,8 @@
     WasmIndices.clear();
     TableIndices.clear();
     DataLocations.clear();
+    CustomSections.clear();
+    ProducerSection.reset();
     CustomSectionsRelocations.clear();
     SignatureIndices.clear();
     Signatures.clear();
@@ -311,7 +314,8 @@
       ArrayRef<wasm::WasmSymbolInfo> SymbolInfos,
       ArrayRef<std::pair<uint16_t, uint32_t>> InitFuncs,
       const std::map<StringRef, std::vector<WasmComdatEntry>> &Comdats);
-  void writeCustomSections(const MCAssembler &Asm, const MCAsmLayout &Layout);
+  void writeCustomSection(WasmCustomSection &CustomSection,
+                          const MCAssembler &Asm, const MCAsmLayout &Layout);
   void writeCustomRelocSections();
   void
   updateCustomSectionRelocations(const SmallVector<WasmFunction, 4> &Functions,
@@ -1045,25 +1049,24 @@
   endSection(Section);
 }
 
-void WasmObjectWriter::writeCustomSections(const MCAssembler &Asm,
-                                           const MCAsmLayout &Layout) {
-  for (auto &CustomSection : CustomSections) {
-    SectionBookkeeping Section;
-    auto *Sec = CustomSection.Section;
-    startCustomSection(Section, CustomSection.Name);
+void WasmObjectWriter::writeCustomSection(WasmCustomSection &CustomSection,
+                                          const MCAssembler &Asm,
+                                          const MCAsmLayout &Layout) {
+  SectionBookkeeping Section;
+  auto *Sec = CustomSection.Section;
+  startCustomSection(Section, CustomSection.Name);
 
-    Sec->setSectionOffset(W.OS.tell() - Section.ContentsOffset);
-    Asm.writeSectionData(W.OS, Sec, Layout);
+  Sec->setSectionOffset(W.OS.tell() - Section.ContentsOffset);
+  Asm.writeSectionData(W.OS, Sec, Layout);
 
-    CustomSection.OutputContentsOffset = Section.ContentsOffset;
-    CustomSection.OutputIndex = Section.Index;
+  CustomSection.OutputContentsOffset = Section.ContentsOffset;
+  CustomSection.OutputIndex = Section.Index;
 
-    endSection(Section);
+  endSection(Section);
 
-    // Apply fixups.
-    auto &Relocations = CustomSectionsRelocations[CustomSection.Section];
-    applyRelocations(Relocations, CustomSection.OutputContentsOffset);
-  }
+  // Apply fixups.
+  auto &Relocations = CustomSectionsRelocations[CustomSection.Section];
+  applyRelocations(Relocations, CustomSection.OutputContentsOffset);
 }
 
 uint32_t WasmObjectWriter::getFunctionType(const MCSymbolWasm &Symbol) {
@@ -1282,6 +1285,13 @@
           report_fatal_error("section name and begin symbol should match: " +
                              Twine(SectionName));
       }
+
+      // Separate out the producers section
+      if (Name == "producers") {
+        ProducerSection = llvm::make_unique<WasmCustomSection>(Name, &Section);
+        continue;
+      }
+
       CustomSections.emplace_back(Name, &Section);
     }
   }
@@ -1570,11 +1580,14 @@
   writeElemSection(TableElems);
   writeCodeSection(Asm, Layout, Functions);
   writeDataSection();
-  writeCustomSections(Asm, Layout);
+  for (auto &CustomSection : CustomSections)
+    writeCustomSection(CustomSection, Asm, Layout);
   writeLinkingMetaDataSection(SymbolInfos, InitFuncs, Comdats);
   writeRelocSection(CodeSectionIndex, "CODE", CodeRelocations);
   writeRelocSection(DataSectionIndex, "DATA", DataRelocations);
   writeCustomRelocSections();
+  if (ProducerSection)
+    writeCustomSection(*ProducerSection, Asm, Layout);
 
   // TODO: Translate the .comment section to the output.
   return W.OS.tell() - StartOffset;
Index: lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
===================================================================
--- lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
+++ lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
@@ -146,6 +146,32 @@
       OutStreamer->PopSection();
     }
   }
+
+  if (const NamedMDNode *Ident = M.getNamedMetadata("llvm.ident")) {
+    llvm::SmallVector<std::pair<StringRef, StringRef>, 1> Tools;
+    for (size_t i = 0, e = Ident->getNumOperands(); i < e; ++i) {
+      const auto *S = cast<MDString>(Ident->getOperand(i)->getOperand(0));
+      std::pair<StringRef, StringRef> Field = S->getString().split("version");
+      Field.first = Field.first.trim();
+      Field.second = Field.second.trim();
+      Tools.push_back(Field);
+    }
+    MCSectionWasm *Producers = OutContext.getWasmSection(
+        ".custom_section.producers", SectionKind::getMetadata());
+    OutStreamer->PushSection();
+    OutStreamer->SwitchSection(Producers);
+    OutStreamer->EmitULEB128IntValue(1);
+    OutStreamer->EmitULEB128IntValue(strlen("processed-by"));
+    OutStreamer->EmitBytes("processed-by");
+    OutStreamer->EmitULEB128IntValue(Tools.size());
+    for (auto &Tool : Tools) {
+      OutStreamer->EmitULEB128IntValue(Tool.first.size());
+      OutStreamer->EmitBytes(Tool.first);
+      OutStreamer->EmitULEB128IntValue(Tool.second.size());
+      OutStreamer->EmitBytes(Tool.second);
+    }
+    OutStreamer->PopSection();
+  }
 }
 
 void WebAssemblyAsmPrinter::EmitConstantPool() {
Index: test/CodeGen/WebAssembly/custom-sections.ll
===================================================================
--- test/CodeGen/WebAssembly/custom-sections.ll
+++ test/CodeGen/WebAssembly/custom-sections.ll
@@ -10,6 +10,9 @@
 !2 = !{ !"green", !"qux" }
 !wasm.custom_sections = !{ !0, !1, !2 }
 
+!llvm.ident = !{!3}
+!3 = !{!"clang version 123"}
+
 ; CHECK:      .section	.custom_section.red,"",@
 ; CHECK-NEXT: .ascii	"foo"
 
@@ -18,3 +21,13 @@
 
 ; CHECK:      .section	.custom_section.green,"",@
 ; CHECK-NEXT: .ascii	"qux"
+
+; CHECK:      .section	.custom_section.producers,"",@
+; CHECK-NEXT: .int8	1
+; CHECK-NEXT: .int8	12
+; CHECK-NEXT: .ascii	"processed-by"
+; CHECK-NEXT: .int8	1
+; CHECK-NEXT: .int8	5
+; CHECK-NEXT: .ascii	"clang"
+; CHECK-NEXT: .int8	3
+; CHECK-NEXT: .ascii	"123"
Index: test/MC/WebAssembly/custom-sections.ll
===================================================================
--- test/MC/WebAssembly/custom-sections.ll
+++ test/MC/WebAssembly/custom-sections.ll
@@ -9,6 +9,9 @@
 !2 = !{ !"green", !"qux" }
 !wasm.custom_sections = !{ !0, !1, !2 }
 
+!3 = !{ !"clang version 123"}
+!llvm.ident = !{!3}
+
 ; CHECK:  Section {
 ; CHECK:    Type: CUSTOM (0x0)
 ; CHECK:    Size: 3
@@ -21,3 +24,9 @@
 ; CHECK:    Offset: 85
 ; CHECK:    Name: green
 ; CHECK:  }
+; CHECK:  Section {
+; CHECK:    Type: CUSTOM (0x0)
+; CHECK:    Size: 25
+; CHECK:    Offset: 118
+; CHECK:    Name: producers
+; CHECK:  }
Index: test/MC/WebAssembly/debug-info.ll
===================================================================
--- test/MC/WebAssembly/debug-info.ll
+++ test/MC/WebAssembly/debug-info.ll
@@ -124,6 +124,12 @@
 ; CHECK-NEXT:    Offset: 991
 ; CHECK-NEXT:    Name: reloc..debug_line
 ; CHECK-NEXT:  }
+; CHECK-NEXT:  Section {
+; CHECK-NEXT:    Type: CUSTOM (0x0)
+; CHECK-NEXT:    Size: 62
+; CHECK-NEXT:    Offset: 1021
+; CHECK-NEXT:    Name: producers
+; CHECK-NEXT:  }
 ; CHECK-NEXT:]
 ; CHECK-NEXT:Relocations [
 ; CHECK-NEXT:  Section (6) DATA {