https://bugs.llvm.org/show_bug.cgi?id=33294
Bug ID: 33294
Summary: clang 4.0 template template partial specialization bug
Product: new-bugs
Version: 4.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: p...@preney.ca
CC: llvm-bugs@lists.llvm.org
Created attachment 18569
--> https://bugs.llvm.org/attachment.cgi?id=18569&action=edit
Program demonstrating clang++ v4.0 issue
Attached is code that shows a bug with the clang++ v4.0 compiler. Such compiles
fine with all versions of GCC and code like this has worked with clang++ v3.9
and earlier.
Specifically, compiling with GCC (e.g., v5, 6, and 7) compiles without issues:
g++-7.1.0 -std=c++14 -Wall -Wextra -pedantic tt.cxx
and runs:
$ ./a.out
10
10
$
Unfortunately, clang++-4.0 outputs these errors:
$ clang++-4.0 -std=c++14 -Wall -Wextra -pedantic tt.cxx
tt.cxx:24:27: error: template template argument has different template
parameters than its corresponding template template parameter
struct is_valuett<valuett<TT>> final : std::true_type { };
^
tt.cxx:23:34: note: template non-type parameter has a different type 'T' in
template argument
template <template <typename T, T> class TT>
^
tt.cxx:17:34: note: previous non-type template parameter with type 'T' is here
template <template <typename T, T> class TT>
^
tt.cxx:24:1: error: cannot combine with previous '(error)' declaration
specifier
struct is_valuett<valuett<TT>> final : std::true_type { };
^
2 errors generated.
zsh: exit 1 clang++-4.0 -std=c++14 -Wall -Wextra -pedantic tt.cxx
$
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