[llvm-bugs] [Bug 35196] New: no warning on target flag when target doesn't match lone configured backend

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35196

            Bug ID: 35196
           Summary: no warning on target flag when target doesn't match
                    lone configured backend
           Product: clang
           Version: 5.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: llvm-bugs at lists.llvm.org, manojgupta at google.com,
                    pirama at google.com, srhines at google.com

It seems that Clang can be configured to only support 1 backend, and that if
you do so then pass -target <triple with a different arch>, that clang just
produces code for the configured arch without any warning or failure.  This led
to: https://lkml.org/lkml/2017/11/2/892

IMO, this should be a compiler error, if not at least a warning.

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