[CrashReproducer] Add -fmodule-cache-path to reproducer script

The cc1 invocation in the reproducer script should contain a valid path in
-fmodule-cache-path; for that reuse "<name>.cache/module" dir we already
use to dump the vfs and modules.

llvm-svn: 265162

1 files changed, 13 insertions, 0 deletions

diff --git a/clang/lib/Driver/Job.cpp b/clang/lib/Driver/Job.cpp
index 3eb23c9ee4c..d44458db2fb 100644
--- a/clang/lib/Driver/Job.cpp
+++ b/clang/lib/Driver/Job.cpp
@@ -18,6 +18,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSet.h"
 #include "llvm/ADT/StringSwitch.h"
+#include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Program.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cassert>
@@ -194,6 +195,18 @@ void Command::Print(raw_ostream &OS, const char *Terminator, bool Quote,
     printArg(OS, "-ivfsoverlay", Quote);
     OS << ' ';
     printArg(OS, CrashInfo->VFSPath.str().c_str(), Quote);
+
+    // Insert -fmodules-cache-path and use the relative module directory
+    // <name>.cache/vfs/modules where we already dumped the modules.
+    SmallString<128> RelModCacheDir = llvm::sys::path::parent_path(
+        llvm::sys::path::parent_path(CrashInfo->VFSPath));
+    llvm::sys::path::append(RelModCacheDir, "modules");
+
+    std::string ModCachePath = "-fmodules-cache-path=";
+    ModCachePath.append(RelModCacheDir.c_str());
+
+    OS << ' ';
+    printArg(OS, ModCachePath.c_str(), Quote);
   }
 
   if (ResponseFile != nullptr) {