MaskRay added a comment.

Thanks for the update. Regarding testing, it seems that unittests will be more 
convenience than creating so many placeholder files in `Inputs/`. 
`clang/unittests/Driver/ToolChainTest.cpp` `TEST(ToolChainTest, 
VFSGCCInstallation)` has an example for Linux. You can add another for Solaris.



================
Comment at: clang/lib/Driver/ToolChains/Gnu.cpp:2258
 
-      Prefixes.push_back(CandidatePrefix);
+      SolarisPrefixes.push_back(CandidatePrefix);
     }
----------------
It's better to use https://en.wikipedia.org/wiki/Schwartzian_transform here to 
avoid calling `llvm::sys::path::filename` and `Generic_GCC::GCCVersion::Parse` 
in the comparator. Then the comparator is just `A < B` and can just be removed.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D157275/new/

https://reviews.llvm.org/D157275

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