ArcsinX added a comment.

It seems this patch can break GCC toolchains support

This patch expects that we never get target-related options in `CommandLine` 
passed to `extractSystemIncludesAndTarget()` for **GCC** toolchain. But seems 
this is not always true because of 
https://github.com/llvm/llvm-project/blob/main/clang-tools-extra/clangd/GlobalCompilationDatabase.cpp#L253

In other words, with this patch we preserve `--target=...`, but this option can 
appear from 
https://github.com/llvm/llvm-project/blob/main/clang-tools-extra/clangd/GlobalCompilationDatabase.cpp#L253
 (but not from `compile_commands.json`). As the result of it, we can call 
**GCC** toolchain with `--target=..` option at trying to query-driver and this 
call will fail (because GCC has no --target option)


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D138546/new/

https://reviews.llvm.org/D138546

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