Index: include/llvm/ObjectYAML/ELFYAML.h
===================================================================
--- include/llvm/ObjectYAML/ELFYAML.h
+++ include/llvm/ObjectYAML/ELFYAML.h
@@ -25,6 +25,8 @@
 namespace llvm {
 namespace ELFYAML {
 
+StringRef dropUniqueSuffix(StringRef S);
+
 // These types are invariant across 32/64-bit ELF, so for simplicity just
 // directly give them their exact sizes. We don't need to worry about
 // endianness because these are just the types in the YAMLIO structures,
Index: lib/ObjectYAML/ELFEmitter.cpp
===================================================================
--- lib/ObjectYAML/ELFEmitter.cpp
+++ lib/ObjectYAML/ELFEmitter.cpp
@@ -340,7 +340,7 @@
   return true;
 }
 
-static StringRef dropUniqueSuffix(StringRef S) {
+StringRef llvm::ELFYAML::dropUniqueSuffix(StringRef S) {
   size_t SuffixPos = S.rfind(" [");
   if (SuffixPos == StringRef::npos)
     return S;
@@ -371,7 +371,8 @@
     assert(Sec && "It can't be null unless it is an implicit section. But all "
                   "implicit sections should already have been handled above.");
 
-    SHeader.sh_name = DotShStrtab.getOffset(dropUniqueSuffix(Sec->Name));
+    SHeader.sh_name =
+        DotShStrtab.getOffset(ELFYAML::dropUniqueSuffix(Sec->Name));
     SHeader.sh_type = Sec->Type;
     if (Sec->Flags)
       SHeader.sh_flags = *Sec->Flags;
@@ -472,7 +473,7 @@
     if (Sym.NameIndex)
       Symbol.st_name = *Sym.NameIndex;
     else if (!Sym.Name.empty())
-      Symbol.st_name = Strtab.getOffset(dropUniqueSuffix(Sym.Name));
+      Symbol.st_name = Strtab.getOffset(ELFYAML::dropUniqueSuffix(Sym.Name));
 
     Symbol.setBindingAndType(Sym.Binding, Sym.Type);
     if (!Sym.Section.empty())
@@ -962,7 +963,7 @@
     if (Name.empty())
       continue;
 
-    DotShStrtab.add(dropUniqueSuffix(Name));
+    DotShStrtab.add(ELFYAML::dropUniqueSuffix(Name));
     if (!SN2I.addName(Name, I))
       reportError("repeated section name: '" + Name +
                   "' at YAML section number " + Twine(I));
@@ -987,12 +988,12 @@
 template <class ELFT> void ELFState<ELFT>::finalizeStrings() {
   // Add the regular symbol names to .strtab section.
   for (const ELFYAML::Symbol &Sym : Doc.Symbols)
-    DotStrtab.add(dropUniqueSuffix(Sym.Name));
+    DotStrtab.add(ELFYAML::dropUniqueSuffix(Sym.Name));
   DotStrtab.finalize();
 
   // Add the dynamic symbol names to .dynstr section.
   for (const ELFYAML::Symbol &Sym : Doc.DynamicSymbols)
-    DotDynstr.add(dropUniqueSuffix(Sym.Name));
+    DotDynstr.add(ELFYAML::dropUniqueSuffix(Sym.Name));
 
   // SHT_GNU_verdef and SHT_GNU_verneed sections might also
   // add strings to .dynstr section.
Index: lib/ObjectYAML/ELFYAML.cpp
===================================================================
--- lib/ObjectYAML/ELFYAML.cpp
+++ lib/ObjectYAML/ELFYAML.cpp
@@ -1151,6 +1151,7 @@
     if (!IO.outputting()) {
       StringRef Name;
       IO.mapOptional("Name", Name, StringRef());
+      Name = ELFYAML::dropUniqueSuffix(Name);
 
       if (ELFYAML::StackSizesSection::nameMatches(Name))
         Section = std::make_unique<ELFYAML::StackSizesSection>();
Index: test/tools/yaml2obj/elf-stack-sizes.yaml
===================================================================
--- test/tools/yaml2obj/elf-stack-sizes.yaml
+++ test/tools/yaml2obj/elf-stack-sizes.yaml
@@ -227,3 +227,34 @@
 Sections:
   - Name: .stack_sizes
     Type: SHT_PROGBITS
+
+## Check we can describe .stack_sizes sections using unique suffixes.
+
+# RUN: yaml2obj --docnum=10 %s -o %t10
+# RUN: llvm-readobj --sections --section-data %t10 | FileCheck %s --check-prefix=SUFFIX
+
+# SUFFIX:      Name: .stack_sizes
+# SUFFIX:      SectionData (
+# SUFFIX-NEXT:   0000: 10000000 00000000 20 |
+
+# SUFFIX:      Name: .stack_sizes
+# SUFFIX:      SectionData (
+# SUFFIX-NEXT:   0000: 30000000 00000000 40 |
+
+--- !ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_EXEC
+  Machine: EM_X86_64
+Sections:
+  - Name:    '.stack_sizes [1]'
+    Type:    SHT_PROGBITS
+    Entries:
+      - Address: 0x10
+        Size:    0x20
+  - Name:    '.stack_sizes [2]'
+    Type:    SHT_PROGBITS
+    Entries:
+      - Address: 0x30
+        Size:    0x40