[LLVMbugs] [Bug 20844] New: Brace-init of non-const references produces code that crashes

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20844

            Bug ID: 20844
           Summary: Brace-init of non-const references produces code that
                    crashes
           Product: clang
           Version: 3.4
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: petar335335 at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12983
  --> http://llvm.org/bugs/attachment.cgi?id=12983&action=edit
the program used to reproduce the bug

The attached program produces the following and crashes on Ubuntu LTS 14.04
AMD64:

-----------------------------------------------------------------
random value
65
Segmentation Fault
-----------------------------------------------------------------

If I remove the brace-init in the X's initializer list and replace it with
()-init, everything seems to work as expected.

Additionally, X x2{s()} produces the correct result even with brace-init.

Compiled with no warnings or errors:
clang++ brace_ref_init.cpp -o brace_ref_init -std=c++11

On gcc:
g++ brace_ref_init.cpp -o brace_ref_init -std=c++11

gcc doesn't compile it, saying:
-----------------------------------------------------------------
brace_ref_init.cpp: In instantiation of ‘X::X(T&) [with T = S]’:
brace_ref_init.cpp:39:17:   required from here
brace_ref_init.cpp:27:18: error: invalid initialization of non-const reference
of type ‘D&’ from an rvalue of type ‘<brace-enclosed initializer list>’
     X(T& v) : d{v} {} // brace-init of d causes incorect behaviour
                  ^
brace_ref_init.cpp: In instantiation of ‘X::X(T&) [with T = D]’:
brace_ref_init.cpp:40:19:   required from here
brace_ref_init.cpp:27:18: error: invalid initialization of non-const reference
of type ‘D&’ from an rvalue of type ‘<brace-enclosed initializer list>’
-----------------------------------------------------------------

GCC bug report that I think is related:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50025

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