yaxunl added inline comments.

================
Comment at: clang/lib/CodeGen/CodeGenModule.cpp:6845-6846
+    llvm::MD5::MD5Result Result;
+    for (const auto &Arg : PreprocessorOpts.Macros)
+      Hash.update(Arg.first);
+    Hash.final(Result);
----------------
jhuber6 wrote:
> yaxunl wrote:
> > Are these options always the same for device and host compilation?
> > 
> > If not, this may not work since host and device compilation will have 
> > different names for the same variable.
> This should only be definitions passed to the front-end via `-D`. There's a 
> handful of these that the Clang driver will pass in, e.g. 
> `-D__GCC_HAVE_DWARF2_CFI_ASM=1`, but as far as I know it's consistent between 
> host and device compilations.
Can we add a comment here saying that this requires that device offloading 
toolchain does not add preprocessor arguments to clang? This is a hidden 
requirement.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D125904/new/

https://reviews.llvm.org/D125904

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