dblaikie added inline comments.
================
Comment at: clang/lib/Driver/Driver.cpp:5736
+      C.getArgs().hasArg(options::OPT_fmodule_output) &&
+      C.getArgs().hasArg(options::OPT_o)) {
+    SmallString<128> OutputPath;
----------------
ChuanqiXu wrote:
> dblaikie wrote:
> > Is there some way we can avoid this (`-fmodule-output  -o ...`) being a 
> > special case? It'd be good if we could use a single common implementation 
> > regardless of whether `-o` is used (ie: Figure out the output file name 
> > (whether it's implicitly determined by clang, in the absence of `-o`, or 
> > explicitly provided by the user through `-o`) and then replace the suffix 
> > with `pcm`)?
> I guess we can't do it or we can't do it easily. Otherwise the .pcm file will 
> always lives in the same directory with the input file.
> I guess we can't do it or we can't do it easily. Otherwise the .pcm file will 
> always lives in the same directory with the input file.

I don't follow/understand. What I mean is, I'd like it, if possible, this was 
implemented by something like "find the path for the .o file output, then 
replace the extension with .pcm".

I worry atht code like this that recomputes something similar to the object 
output path risks getting out of sync with the actual object path.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D137058/new/

https://reviews.llvm.org/D137058

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