Add an early return.

Total memory allocation when linking clang goes from 281.80MB to
270.96MB.

llvm-svn: 319930

diff --git a/lld/ELF/LinkerScript.cpp b/lld/ELF/LinkerScript.cpp
index 7db282bdb72146252536aeb9ec978e11b732c02e..f301afc403173c04650acdf82b323eb238d21444 100644 (file)
--- a/lld/ELF/LinkerScript.cpp
+++ b/lld/ELF/LinkerScript.cpp
@@ -184,6 +184,8 @@ static std::string getFilename(InputFile *File) {
 }
 
 bool LinkerScript::shouldKeep(InputSectionBase *S) {
+  if (KeptSections.empty())
+    return false;
   std::string Filename = getFilename(S->File);
   for (InputSectionDescription *ID : KeptSections)
     if (ID->FilePat.match(Filename))