[LLVMbugs] [Bug 9890] New: Should accept -ftemplate-depth=N with a warning

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9890

           Summary: Should accept -ftemplate-depth=N with a warning
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: dgregor at apple.com
                CC: llvmbugs at cs.uiuc.edu


For some silly reason, GCC used

  -ftemplate-depth-N

rather than the more obvious

  -ftemplate-depth=N

and we mimic that behavior. At the very least, we should support

  -ftemplate-depth=N

as an alias (and perhaps provide a warning at the driver level).

To see why:

$ cat test.cpp
template<bool b, int t, int f>
struct _if {
  static const int result = f;
};

template<int t, int f>
struct _if<true, t, f> {
  static const int result = t;
};

template<int i>
struct fact {
  static const int result = _if<i == 0, 1, i*fact<i - 1>::result>::result;
};

int main()
{
  int a = fact<4>::result;
}

$ clang++ -ftemplate-depth=100 test.cpp 
clang: error: unable to execute command: Segmentation fault: 11
clang: error: clang frontend command failed due to signal 1 (use -v to see
invocation)

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