[lldb][swift] Ignore -- flag in swift-extra-clang-flags #2407
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`--` indicates to Clang that all following arguments are file names (even when they match a Clang compiler flag). This leads to the confusion situation where LLDB users can run `settings set target.swift-extra-clang-flags -- -v` and completely break the embedded Clang instance (that now tries to open the file `-v`). Fixes rdar://58457122 (cherry picked from commit 7fd0352)
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--indicates to Clang that all following arguments are file names (even whenthey match a Clang compiler flag). This leads to the confusion situation
where LLDB users can run
settings set target.swift-extra-clang-flags -- -vand completely break the embedded Clang instance (that now tries to open the
file
-v).Fixes rdar://58457122
(cherry picked from commit 7fd0352)