[llvm-bugs] [Bug 48093] New: --save-temps generates invalid command lines when reading from stdin or files whose names start with hyphens

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48093

            Bug ID: 48093
           Summary: --save-temps generates invalid command lines when
                    reading from stdin or files whose names start with
                    hyphens
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Testcase:

$ echo 'int main() {}' | clang -x c++ - -o tmp.o --save-temps
error: unknown argument: '-.ii'

It looks like the driver is not properly escaping filenames that might be
confused for command-line arguments to subtools.

Similarly:

$ touch -- -.c
$ clang ./-.c --save-temps
error: unknown argument: '-.i'

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