[clang] [Clang][Driver] Override complex number calculation method by -fno-fa… (PR #132680)

[Andy Kaylor via cfe-commits]

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@@ -2997,6 +2997,7 @@ static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
   LangOptions::ComplexRangeKind Range = LangOptions::ComplexRangeKind::CX_None;
   std::string ComplexRangeStr = "";
   std::string GccRangeComplexOption = "";
+  std::string LastComplexRangeOption = "";
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andykaylor wrote:

I don't think I remember during our Discourse discussion of this that there was already a `GccRangeComplexOption` variable here. Do we really need another variable? If you just set GccRangeComplexOption to empty for `-ffast-math` and `-fno-fast-math`, would that give us reasonable diagnostics?

https://github.com/llvm/llvm-project/pull/132680