llvm-project

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import lit
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# Use lit's internal shell to help guarantee test portability.
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config.test_format = lit.formats.ShTest(execute_external=False)
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# %ProtectFileCheckOutput should precede a FileCheck call if and only if the
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# call's textual output affects test results.  It's usually easy to tell: just
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# look for redirection or piping of the FileCheck call's stdout or stderr.
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#
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# Examples:
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#
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#   ; Test another program, using FileCheck to verify its textual output.
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#   ; Only FileCheck's exit status affects test results, so a bare FileCheck
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#   ; call is sufficient and more convenient for debugging.
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#   ;
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#   ; RUN: %t | FileCheck %s
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#   ; CHECK: {{[0-9]+\.0}}
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#
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#   ; Test FileCheck itself, but only examine its exit status, so a bare
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#   ; FileCheck call is still sufficient and more convenient for debugging.
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#   ;
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#   ; RUN: FileCheck -input-file %s %s
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#   ; CHECK: {{[0-9]+\.0}}
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#   ; 5.0
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#
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#   ; Check that the FileCheck trace is off by default.  The first FileCheck
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#   ; call's textual output affects test results, so it requires
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#   ; %ProtectFileCheckOutput to be safe.
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#   ;
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#   ; RUN: %ProtectFileCheckOutput FileCheck -input-file %s %s 2>&1 \
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#   ; RUN: | FileCheck -allow-empty -check-prefix QUIET %s
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#   ;
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#   ; CHECK: {{[0-9]+\.0}}
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#   ; 5.0
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#   ; QUIET-NOT: expected string found in input
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#
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#   ; Check that the FileCheck trace is on when FILECHECK_OPTS=-v.
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#   ; FILECHECK_OPTS must be set after %ProtectFileCheckOutput, which clears
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#   ; FILECHECK_OPTS beforehand.
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#   ;
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#   ; RUN: %ProtectFileCheckOutput FILECHECK_OPTS=-v \
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#   ; RUN: FileCheck -dump-input=never -input-file %s %s 2>&1 \
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#   ; RUN: | FileCheck -check-prefix TRACE %s
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#   ;
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#   ; CHECK: {{[0-9]+\.0}}
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#   ; 5.0
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#   ; TRACE: expected string found in input
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#
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# %ProtectFileCheckOutput's purpose is to ensure correct test results when
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# developers set FileCheck environment variables (e.g.,
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# FILECHECK_OPTS=-dump-input=fail) to tweak the output of FileCheck while
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# debugging tests.  If a developer sets values that affect FileCheck's exit
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# status (e.g., FILECHECK_OPTS=-strict-whitespace), he shouldn't be surprised
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# that test results throughout all test suites are affected.
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config.substitutions.append(("%ProtectFileCheckOutput", "env -u FILECHECK_OPTS"))
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