https://llvm.org/bugs/show_bug.cgi?id=29094
Bug ID: 29094
Summary: C++11 attributes not accepted in template explicit
instantiation
Product: clang
Version: 3.8
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: unassignedclangb...@nondot.org
Reporter: matthew.woeh...@kitware.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
Clang rejects the following code, with the error "an attribute list cannot
appear here":
template <typename T>
T foo(T) { return 0; }
template [[gnu::visibility("default")]]
int foo<int>(int);
Live example:
https://gcc.godbolt.org/#compilers:!((compiler:clang380,options:'-std%3Dc%2B%2B11',source:'template+%3Ctypename+T%3E%0AT+foo(T)+%7B+return+0%3B+%7D%0A%0Atemplate+%5B%5Bgnu::visibility(%22default%22)%5D%5D%0Aint+foo%3Cint%3E(int)%3B%0A')),filterAsm:(commentOnly:!t,directives:!t,labels:!t),version:3
GCC accepts this code. As I read N4606 [A.6] and [A.12], this should be
accepted as:
<explicit-instantiation> -->
[extern] template <declaration> -->
[extern] template <nodeclspec-function-declaration> -->
[extern] template [<attribute-specifier-seq>] <declarator> ;
Moreover, there doesn't seem to be any manner in which Clang accepts an
attribute on an explicit instantiation, which seems surely not intended. Also,
the old style attribute, `__attribute__((visibility("default")))`, is accepted.
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