[LLVMbugs] [Bug 12668] New: Non-const template argument diagnostics not helpful

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12668

             Bug #: 12668
           Summary: Non-const template argument diagnostics not helpful
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: llvm-bugs at quasiparticle.net
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Given this code, clang++ should diagnose that 'x' is not a constant, and thus
can't be used as a template argument.

template<int I>
void foo()
{
  int x = I;
  foo<x>();
}

This actually results in
"error: no matching member function for call to 'foo'"
with a final notice of
"note: candidate template ignored: invalid explicitly-specified argument for
template parameter 'I'".

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