https://llvm.org/bugs/show_bug.cgi?id=28404
Bug ID: 28404
Summary: clang rejects valid C++ code with nested template
classes
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: s...@cs.ucdavis.edu
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
The current clang trunk rejects the following valid C++ test case (which is
accepted by GCC) on x86_64-linux-gnu in both 32-bit and 64-bit modes.
It is accepted by 3.1, and rejected by 3.2 and later.
$ clang++-trunk -v
clang version 3.9.0 (trunk 274430)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/tools/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.1.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ g++-6.1 -c -Wall -Wextra -pedantic -std=c++11 small.cpp
$
$ clang++-trunk -c -std=c++11 small.cpp
small.cpp:10:27: warning: dependent nested name specifier 'A<X>::B::' for
friend class declaration is not supported; turning off access control for 'S'
[-Wunsupported-friend]
friend void A < X >::B::operator= (Y);
~~~~~~~~~~~~^
small.cpp:10:24: error: no member 'A' in 'S<int>'; it has not yet been
instantiated
friend void A < X >::B::operator= (Y);
^
small.cpp:13:11: note: in instantiation of template class 'S<int>' requested
here
S < int > s;
^
small.cpp:3:29: note: not-yet-instantiated member is declared here
template < class > struct A
^
1 warning and 1 error generated.
$
----------------------------------------------
template < class > struct S
{
template < class > struct A
{
struct B {};
};
template < class X >
template < class Y >
friend void A < X >::B::operator= (Y);
};
S < int > s;
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