[llvm-bugs] [Bug 40284] New: [FileCheck] FILECHECK_DUMP_INPUT_ON_FAILURE and FILECHECK_OPTS should be usable for FileCheck test suite

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40284

            Bug ID: 40284
           Summary: [FileCheck] FILECHECK_DUMP_INPUT_ON_FAILURE and
                    FILECHECK_OPTS should be usable for FileCheck test
                    suite
           Product: Test Suite
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: lit
          Assignee: unassignedbugs at nondot.org
          Reporter: dan at su-root.co.uk
                CC: daniel at zuster.org, jdenny.ornl at gmail.com,
                    llvm-bugs at lists.llvm.org

Right now setting FILECHECK_DUMP_INPUT_ON_FAILURE and/or FILECHECK_OPTS in
environment variables can break running the FileCheck test suite because this
changes the output of the FileCheck under test.

We should fix this so that we make a distinction between the FileCheck under
test and the FileCheck being used to check FileCheck by unsetting the
environment variables for the former.

A simpler work around is available in https://reviews.llvm.org/D56541 but it is
not an ideal solution.

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