sfantao added a comment.
Hi Justin,
Thanks for the patch.
================
Comment at: clang/lib/Driver/Driver.cpp:479
+ // the device toolchain we create depends on both.
+ ToolChain *&CudaTC = ToolChains[CudaTriple.str() + "/" + HostTriple.str()];
+ if (!CudaTC) {
----------------
I am not sure I understand why to pair host and device toolchain in the map.
The driver can be used to several compilations, but how do these compilation
use different host toolchains? Can you give an example of an invocation? Maybe
add it to the regression tests bellow.
https://reviews.llvm.org/D26774
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