[LLVMbugs] [Bug 12091] New: Problems with nested initializer list

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12091

             Bug #: 12091
           Summary: Problems with nested initializer list
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++0x
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: janski.krzysztof at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


For the code:
---
struct A
{
    int a;
public:
    A(int a): a(a) {}
};

struct B1
{
    B1(const A& a): a(a) {}
    A a;
};

struct B2
{
    A a;
};

int main()
{
    B1 b1 {{1}};
    B2 b2 {{2}};
    return 0;
}
---
I got the following output from clang (user path replaced with $HOME):
---
$ clang++ -v -std=c++0x initializer_list.cpp
clang version 3.1 (http://llvm.org/git/clang.git
ea7c1e24f33c554aeac07dc4f6dc7493dd98e272)
Target: x86_64-unknown-linux-gnu
Thread model: posix
 "$HOME/sysroot/opt/clang/bin/clang" -cc1 -triple x86_64-unknown-linux-gnu
-emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name
initializer_list.cpp -mrelocation-model static -mdisable-fp-elim -masm-verbose
-mconstructor-aliases -munwind-tables -target-cpu x86-64
-momit-leaf-frame-pointer -v -resource-dir
$HOME/sysroot/opt/clang/bin/../lib/clang/3.1 -fmodule-cache-path
/var/tmp/clang-module-cache -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6 -internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/x86_64-linux-gnu
-internal-isystem
/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/backward
-internal-isystem /usr/local/include -internal-isystem
$HOME/sysroot/opt/clang/bin/../lib/clang/3.1/include -internal-externc-isystem
/usr/include/x86_64-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -std=c++0x -fdeprecated-macro
-fdebug-compilation-dir $HOME/tmp -ferror-limit 19 -fmessage-length 0
-mstackrealign -fgnu-runtime -fobjc-runtime-has-arc -fobjc-runtime-has-weak
-fobjc-fragile-abi -fcxx-exceptions -fexceptions -fdiagnostics-show-option -o
/tmp/initializer_list-5Fzphb.o -x c++ initializer_list.cpp
clang -cc1 version 3.1 based upon LLVM 3.1svn default target
x86_64-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6
 /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/x86_64-linux-gnu
 /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../../include/c++/4.6/backward
 /usr/local/include
 $HOME/sysroot/opt/clang/bin/../lib/clang/3.1/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
initializer_list.cpp:21:5: error: call to constructor of 'B1' is ambiguous
        B1 b1 {{1}};
           ^  ~~~~~
initializer_list.cpp:8:8: note: candidate is the implicit move constructor
struct B1
       ^
initializer_list.cpp:8:8: note: candidate is the implicit copy constructor
initializer_list.cpp:10:2: note: candidate constructor
        B1(const A& a): a(a) {}
        ^
initializer_list.cpp:22:9: error: initialization of non-aggregate type 'A' with
an initializer list
        B2 b2 {{2}};
               ^~~
2 errors generated.
---

The code compiles with gcc 4.6.2. Unfortunately I'm not familiar enough with
C++11 to say which compiler is right, I suppose gcc.

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