clang auxiliary programs throwing errors

[Marco Atzeri <marco dot atzeri at gmail dot com>]

First reported on
https://stackoverflow.com/questions/50415528/clang-format-installed-via-cygwin-wont-run

on both 32 and 64 bit version, the auxiliary programs
of clang package are throwing an error.

$ clang-format
: CommandLine Error: Option 'disable-symbolication' registered more than 
once!
LLVM ERROR: inconsistency in registered CommandLine options

$ /usr/bin/clang-import-test.exe
: CommandLine Error: Option 'disable-symbolication' registered more than 
once!
LLVM ERROR: inconsistency in registered CommandLine options

$ /usr/bin/clang-check.exe
: CommandLine Error: Option 'disable-symbolication' registered more than 
once!
LLVM ERROR: inconsistency in registered CommandLine options

$ /usr/bin/c-index-test.exe
: CommandLine Error: Option 'disable-symbolication' registered more than 
once!
LLVM ERROR: inconsistency in registered CommandLine options

$ cygcheck -c clang
Cygwin Package Information
Package              Version        Status
clang                5.0.1-2        OK

$ clang
clang-5.0: error: no input files

$ clang --version
clang version 5.0.1 (tags/RELEASE_501/final)
Target: i686-pc-windows-cygnus
Thread model: posix
InstalledDir: /usr/bin



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