[PATCH] D95915: [clang][driver] Only warn once about invalid -stdlib value

[Jonas Hahnfeld via Phabricator via cfe-commits]

Hahnfeld added inline comments.


================
Comment at: clang/include/clang/Driver/ToolChain.h:169-177
+  mutable bool isCXXStdlibTypeCached;
+  mutable CXXStdlibType cxxStdlibType;
+
+  mutable bool isRuntimeLibTypeCached;
+  mutable RuntimeLibType runtimeLibType;
+
+  mutable bool isUnwindLibTypeCached;
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Maybe `llvm::Optional` for each type instead of having two members?


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  https://reviews.llvm.org/D95915/new/

https://reviews.llvm.org/D95915