From 7d053709d4c20c3d459a4c5d33bba44550e41092 Mon Sep 17 00:00:00 2001
From: Rui Ueyama <ruiu@google.com>
Date: Tue, 25 Sep 2018 14:34:56 +0000
Subject: [PATCH] Parallelize .gdb_index string table writes.

When we are creating a large .gdb_index, this change makes a difference.

llvm-svn: 342978
---
 lld/ELF/SyntheticSections.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lld/ELF/SyntheticSections.cpp b/lld/ELF/SyntheticSections.cpp
index e4b1b0cc9864..a12a50626a5f 100644
--- a/lld/ELF/SyntheticSections.cpp
+++ b/lld/ELF/SyntheticSections.cpp
@@ -2576,8 +2576,9 @@ void GdbIndexSection::writeTo(uint8_t *Buf) {
 
   // Write the string pool.
   Hdr->ConstantPoolOff = Buf - Start;
-  for (GdbSymbol &Sym : Symbols)
+  parallelForEach(Symbols, [&](GdbSymbol &Sym) {
     memcpy(Buf + Sym.NameOff, Sym.Name.data(), Sym.Name.size());
+  });
 
   // Write the CU vectors.
   for (GdbSymbol &Sym : Symbols) {