https://bugs.llvm.org/show_bug.cgi?id=48746

            Bug ID: 48746
           Summary: command line defines are truncated at double slash
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected]

A define specified via -D that has two slashes together will be truncated.
Example:

> echo TFILE > test
> cpp  -DTFILE="/some/path//foo/bar" test
# 1 "test"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 338 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "test" 2
/some/path
>

Expected output of the preprocessor should have /some/path//foo/bar.

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