[LLVMbugs] [Bug 5239] New: FileCheck should try to fuzzy match forward when checks fail

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5239

           Summary: FileCheck should try to fuzzy match forward when checks
                    fail
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gccas
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: daniel at zuster.org
                CC: llvmbugs at cs.uiuc.edu


Consider this log taken from a buildbot:
--
******************** TEST 'Clang::CodeGenCXX/references.cpp' FAILED
********************Script:
--
/Users/buildslave/zorg/smooshlab/slaves/clang/build.clang-i386-darwin9/llvm/Debug/bin/clang-cc
-verify -emit-llvm -o -
/Users/buildslave/zorg/smooshlab/slaves/clang/build.clang-i386-darwin9/llvm/tools/clang/test/CodeGenCXX/references.cpp
| FileCheck
/Users/buildslave/zorg/smooshlab/slaves/clang/build.clang-i386-darwin9/llvm/tools/clang/test/CodeGenCXX/references.cpp
--
Exit Code: 1
Command Output (stdout):
--
--
Command Output (stderr):
--
/Users/buildslave/zorg/smooshlab/slaves/clang/build.clang-i386-darwin9/llvm/tools/clang/test/CodeGenCXX/references.cpp:124:34:
error: expected string not found in input
 // CHECK: call void @_ZN1T1B1fEv
                                 ^
<stdin>:245:24: note: scanning from here
 call void @_ZN1T1BC1Ev(%struct.A* %tmp)
                       ^
--

********************
--

The failure is probably something about the mangling being different on the
platform in question. It would be nice if when there is a check failure,
FileCheck would scan forward "fuzzily" trying to find the most likely match.
For example, if the next line in the log was 'call void @_ZN1T1B$@^@' I would
like to see an additional:
--
<stdin>:246:1: note: found likely match here:
call void @_ZN1T1B$@^@
^
--

The "fuzzyness" could be something like minimum edit distance within the next
1k characters, or so.


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