pcc added inline comments.

================
Comment at: lib/Driver/ToolChains/CommonArgs.cpp:423
+    llvm::sys::path::native(Dwo_Dir, DwoDir);
+    llvm::sys::path::append(DwoDir, Twine(Output.getFilename()) + "_dwo");
+    CmdArgs.push_back(
----------------
I think that if I pass `-gsplit-dwarf=/path/to/foo` I would expect the dwo 
directory to be named `/path/to/foo`, not `/path/to/foo/something_dwo`.


================
Comment at: lib/Driver/ToolChains/CommonArgs.cpp:428
+
+  if (Args.hasArg(options::OPT_gsplit_dwarf)) {
+    if (!Args.getLastArg(options::OPT_gsplit_dwarf_EQ)) {
----------------
If you make this `else if (Args.hasArg(options::OPT_gsplit_dwarf)) {` you 
wouldn't need the if on line 429.


https://reviews.llvm.org/D44788



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