https://llvm.org/bugs/show_bug.cgi?id=26053
Bug ID: 26053
Summary: Pack expansion mangling inadequate: error: definition
with same mangled name as another definition
Product: clang
Version: trunk
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: unassignedclangb...@nondot.org
Reporter: hst...@ca.ibm.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
When a function parameter pack expands parameter packs of a member function
template alongside parameter packs of an enclosing context, the mangling used
(namely SUBSTPACK) is insufficient.
Online compiler: http://melpon.org/wandbox/permlink/wza71mJ5R0feCcG5
### SOURCE (<stdin>):
template <typename> struct A;
template <typename ...> struct Tup;
template <typename ...T, typename ...U>
struct A<Tup<Tup<T ...>, Tup<U ...>>> {
template <typename ...TT> void foo(T (* ...fp[])(TT)) { }
template <typename ...TT> void foo(U (* ...fp[])(TT)) { }
};
int main(void) {
A<Tup<Tup<short>, Tup<wchar_t>>> a;
a.foo<int>(static_cast<short (**)(int)>(0));
a.foo<int>(static_cast<wchar_t (**)(int)>(0));
}
### COMPILER INVOCATION:
clang++ -x c++ -std=c++11 -
### ACTUAL OUTPUT:
<stdin>:7:35: error: definition with same mangled name as another definition
template <typename ...TT> void foo(U (* ...fp[])(TT)) { }
^
<stdin>:6:35: note: previous definition is here
template <typename ...TT> void foo(T (* ...fp[])(TT)) { }
^
1 error generated.
### EXPECTED OUTPUT:
(clean compile and link)
### COMPILER VERSION INFO:
clang version 3.8.0 (trunk 256937)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/llvm-head/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
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