[LLVMbugs] [Bug 12674] New: Garbage characters at the end of "expanded from macro" notes (lots of <U+0000>)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12674

             Bug #: 12674
           Summary: Garbage characters at the end of "expanded from macro"
                    notes (lots of <U+0000>)
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nicolasweber at gmx.de
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


When adding a ';' at the end of any of the lines in net/base/net_error_list.h
in chromium and then building the 'net' target, the following is included in
the error output:

ERR_DNS_SERVER_REQUIRES_TCP<U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+0000><U+
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A reduced version of that looks like this:


enum Error {
  // No error.
  OK = 0,

#define NET_ERROR(label, value) ERR_ ## label = value,

NET_ERROR(DNS_MALFORMED_RESPONSE, -800);
NET_ERROR(DNS_SERVER_REQUIRES_TCP, -801)

#undef NET_ERROR

  // The value of the first certificate error code.
  ERR_CERT_BEGIN = 10,
};


But on that case, the error doesn't look as bad:


hummer:src thakis$ ~/src/llvm-svn/Release+Asserts/bin/clang -c test.cc
test.cc:7:40: error: expected '}'
NET_ERROR(DNS_MALFORMED_RESPONSE, -800);
                                       ^
test.cc:1:12: note: to match this '{'
enum Error {
           ^
test.cc:8:1: error: C++ requires a type specifier for all declarations
NET_ERROR(DNS_SERVER_REQUIRES_TCP, -801)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test.cc:5:33: note: expanded from macro 'NET_ERROR'
#define NET_ERROR(label, value) ERR_ ## label = value,
                                ^
<scratch space>:3:1: note: expanded from macro 'ERR_'
ERR_DNS_SERVER_REQUIRES_TCP...
^~~~~~~~~~~~~~~~~~~~~~~~~~~
test.cc:13:17: error: expected ';' after top level declarator
  ERR_CERT_BEGIN = 10,
                ^
                ;
test.cc:14:1: error: extraneous closing brace ('}')
};
^
4 errors generated.


(only '...') Maybe the "expanded from macro" note does an out-of-bounds read,
and before the recent tweak to unprintable character printing, this was less
noticable?

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