Pass UseCASBackend flag to replayCachedResult (cherry-pick https://github.com/apple/llvm-project/pull/8002 to stable/20230725 branch)

clang/include/clang/Frontend/CompileJobCache.h

@@ -81,12 +81,13 @@ class CompileJobCache {
   /// \returns true if finished successfully.
   bool finishComputedResult(CompilerInstance &Clang, bool Success);
 
-  static llvm::Expected<std::optional<int>> replayCachedResult(
-      std::shared_ptr<CompilerInvocation> Invok, StringRef WorkingDir,
-      const llvm::cas::CASID &CacheKey,
-      cas::CompileJobCacheResult &CachedResult, SmallVectorImpl<char> &DiagText,
-      bool WriteOutputAsCASID = false, bool UseCASBackend = false,
-      std::optional<llvm::cas::CASID> *MCOutputID = nullptr);
+  static llvm::Expected<std::optional<int>>
+  replayCachedResult(std::shared_ptr<CompilerInvocation> Invok,
+                     StringRef WorkingDir, const llvm::cas::CASID &CacheKey,
+                     cas::CompileJobCacheResult &CachedResult,
+                     SmallVectorImpl<char> &DiagText,
+                     bool WriteOutputAsCASID = false,
+                     std::optional<llvm::cas::CASID> *MCOutputID = nullptr);
 
   class CachingOutputs;
 

clang/lib/Frontend/CompileJobCache.cpp

@@ -542,7 +542,7 @@ Expected<std::optional<int>> CompileJobCache::replayCachedResult(
     std::shared_ptr<CompilerInvocation> Invok, StringRef WorkingDir,
     const llvm::cas::CASID &CacheKey, cas::CompileJobCacheResult &CachedResult,
     SmallVectorImpl<char> &DiagText, bool WriteOutputAsCASID,
-    bool UseCASBackend, std::optional<llvm::cas::CASID> *OutMCOutputID) {
+    std::optional<llvm::cas::CASID> *OutMCOutputID) {
   CompilerInstance Clang;
   Clang.setInvocation(std::move(Invok));
   llvm::raw_svector_ostream DiagOS(DiagText);
@@ -573,7 +573,7 @@ Expected<std::optional<int>> CompileJobCache::replayCachedResult(
   std::optional<llvm::cas::CASID> MCOutputID;
   ObjectStoreCachingOutputs CachingOutputs(
       Clang, WorkingDir, std::move(PrefixMapper), WriteOutputAsCASID,
-      UseCASBackend, MCOutputID,
+      Clang.getInvocation().getCodeGenOpts().UseCASBackend, MCOutputID,
       /*CAS*/ nullptr, /*Cache*/ nullptr);
   if (OutMCOutputID)
     *OutMCOutputID = std::move(MCOutputID);

clang/test/CAS/mccas-replay.c

@@ -0,0 +1,20 @@
+// RUN: rm -rf %t && mkdir %t
+
+// RUN: %clang -cc1depscan -o %t/args.rsp  -cc1-args -cc1 \
+// RUN:    -debug-info-kind=standalone -dwarf-version=4 -debugger-tuning=lldb \
+// RUN:    -emit-obj -fcas-backend  -fcas-path %t/cas       %s -o - > /dev/null
+
+// RUN: %clang @%t/args.rsp -o %t/output1.o -Rcompile-job-cache 2> %t/output1.txt
+
+// RUN: cat %t/output1.txt | grep llvmcas | sed \
+// RUN:       -e "s/^.*miss for '//" \
+// RUN:       -e "s/' .*$//" > %t/cache-key 
+
+// RUN: c-index-test core -replay-cached-job -cas-path %t/cas @%t/cache-key \
+// RUN:       -working-dir %t  -- @%t/args.rsp -o %t/output2.o
+
+// RUN: diff %t/output1.o %t/output2.o 
+
+int foo(int x) {
+    return x+1;
+}