================
@@ -3218,6 +3218,21 @@ static bool ParseHeaderSearchArgs(HeaderSearchOptions 
&Opts, ArgList &Args,
   bool IsIndexHeaderMap = false;
   bool IsSysrootSpecified =
       Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
+
+  // Expand a leading `=` to the sysroot if one was passed (and it's not a
+  // framework flag).
+  auto ConvertHeaderPath = [IsSysrootSpecified,
----------------
compnerd wrote:

I think that `Prefix` or `Expand` would both be better than `Convert`. We 
aren't really converting this.

https://github.com/llvm/llvm-project/pull/82084
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