Revert "[clang] - Simplify tools::SplitDebugName."

This reverts commit r347035 as it introduced assertion failures under
certain conditions. More information can be found here:
https://reviews.llvm.org/rL347035

llvm-svn: 347676

1 files changed, 15 insertions, 4 deletions

diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 03298a17c37..e802ce7a8c0 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -808,15 +808,26 @@ bool tools::areOptimizationsEnabled(const ArgList &Args) {
   return false;
 }
 
-const char *tools::SplitDebugName(const ArgList &Args,
+const char *tools::SplitDebugName(const ArgList &Args, const InputInfo &Input,
                                   const InputInfo &Output) {
   if (Arg *A = Args.getLastArg(options::OPT_gsplit_dwarf_EQ))
     if (StringRef(A->getValue()) == "single")
       return Args.MakeArgString(Output.getFilename());
 
-  SmallString<128> T(Output.getFilename());
-  llvm::sys::path::replace_extension(T, "dwo");
-  return Args.MakeArgString(T);
+  Arg *FinalOutput = Args.getLastArg(options::OPT_o);
+  if (FinalOutput && Args.hasArg(options::OPT_c)) {
+    SmallString<128> T(FinalOutput->getValue());
+    llvm::sys::path::replace_extension(T, "dwo");
+    return Args.MakeArgString(T);
+  } else {
+    // Use the compilation dir.
+    SmallString<128> T(
+        Args.getLastArgValue(options::OPT_fdebug_compilation_dir));
+    SmallString<128> F(llvm::sys::path::stem(Input.getBaseInput()));
+    llvm::sys::path::replace_extension(F, "dwo");
+    T += F;
+    return Args.MakeArgString(F);
+  }
 }
 
 void tools::SplitDebugInfo(const ToolChain &TC, Compilation &C, const Tool &T,