[LLVMbugs] [Bug 7986] New: poor diagnostic for leading mystery bytes

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7986

           Summary: poor diagnostic for leading mystery bytes
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=5411)
 --> (http://llvm.org/bugs/attachment.cgi?id=5411)
testcase

This error took me a while to figure out:

nlewycky at ducttape:~$ llvm/Debug+Asserts/bin/clang++ x.cc -fsyntax-only
x.cc:1:1: error: expected unqualified-id
// Surprise!
^
1 error generated.

it would've been awesome if clang had pointed out the unprintable characters at
the front of the file.

I should mention that gcc doesn't mind those characters at all but that's
probably part of proper UTF-8 support. Testcase attached!

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