[clang] [lld] [llvm] [llvm][clang][lld][COFF] Add support for case-insensitive path lookup (PR #178585)

[Hans Wennborg via llvm-commits]

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@@ -1186,6 +1186,9 @@ void Clang::AddPreprocessingOptions(Compilation &C, const JobAction &JA,
 
   Args.addOptInFlag(CmdArgs, options::OPT_fdefine_target_os_macros,
                     options::OPT_fno_define_target_os_macros);
+
+  if (Args.hasArg(options::OPT_fcase_insensitive_paths))
+    CmdArgs.push_back("-fcase-insensitive-paths");
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zmodem wrote:

The options handling has evolved a lot since then. If it works without this code we should drop it.

https://github.com/llvm/llvm-project/pull/178585