[LLVMbugs] [Bug 20312] New: wrong tokenization around invalid UCNs

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Jul 15 16:06:07 PDT 2014


            Bug ID: 20312
           Summary: wrong tokenization around invalid UCNs
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


  #define X(a) y##a
  #define yx Q(
  #define Q(x)

This code is ill-formed: it contains the identifier token 'x\u200e' which
contains the UCN '\u200e' which is not permitted in an identifier.

Clang treats this as two tokens instead, and as a result accepts the above
ill-formed code. This similar case is correctly rejected:


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