Add testing in llvm-lto for ThinLTO caching.

Trying to improve code coverage for `make check`

From: mehdi_amini <mehdi_amini@91177308-0d34-0410-b5e6-96231b3b80d8>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269545 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/tools/llvm-lto/llvm-lto.cpp b/tools/llvm-lto/llvm-lto.cpp
index 655e8c8379e..51767977dd0 100644
--- a/tools/llvm-lto/llvm-lto.cpp
+++ b/tools/llvm-lto/llvm-lto.cpp
@@ -109,6 +109,9 @@ static cl::opt<std::string> ThinLTOModuleId(
     cl::desc("For the module ID for the file to process, useful to "
              "match what is in the index."));
 
+static cl::opt<std::string>
+    ThinLTOCacheDir("thinlto-cache-dir", cl::desc("Enable ThinLTO caching."));
+
 static cl::opt<bool>
     SaveModuleFile("save-merged-module", cl::init(false),
                    cl::desc("Write merged LTO module to file before CodeGen"));
@@ -350,6 +353,7 @@ public:
   ThinLTOProcessing(const TargetOptions &Options) {
     ThinGenerator.setCodePICModel(RelocModel);
     ThinGenerator.setTargetOptions(Options);
+    ThinGenerator.setCacheDir(ThinLTOCacheDir);
 
     // Add all the exported symbols to the table of symbols to preserve.
     for (unsigned i = 0; i < ExportedSymbols.size(); ++i)