[LLVMbugs] [Bug 16894] New: Clang crashes on certain (brace-)conversion from char to int in functions of classtemplates

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16894

            Bug ID: 16894
           Summary: Clang crashes on certain (brace-)conversion from char
                    to int in functions of classtemplates
           Product: clang
           Version: 3.3
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: florian.weber at sfz-bw.de
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11038
  --> http://llvm.org/bugs/attachment.cgi?id=11038&action=edit
The complete commandline

Clang 3.3 on x86_64-unknown-linux-gnu crashes on the following code:

void gun(int){}

template<typename>
struct foo{
    void fun () {
        char i = 0;
        gun(int{i});
    }
};

int main () {
    foo<void> bar;
    bar.fun();
}

The relevant diagnostics are:

fatal error: error in backend: Cannot select: 0x272b3b0: i32 = bitcast
0x272adb0 [ORD=5] [ID=9]
  0x272adb0: i8 = Constant<0> [ORD=3] [ID=4]
In function: _ZN3fooIvE3funEv
clang: error: clang frontend command failed with exit code 70 (use -v to see
invocation)

“un-templating” the classtemplate, doing the conversion outside a function-call
and doing the conversion from a temporary variable (“gun(int{char{0}})”) all
make the issue vanish.

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