https://bugs.llvm.org/show_bug.cgi?id=46289
Bug ID: 46289
Summary: lack of "templates must have C++ linkage" error
message in a linkage specification
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: unassignedclangbugs at nondot.org
Reporter: haoxintu at gmail.com
CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
richard-llvm at metafoo.co.uk
This code bug.cc
namespace g_namespace{}
extern "C" {template <class> using g_namespace;}
extern "C" {template <class> void foo(){}}
Clang only gives the "templates must have C++ linkage" error message in line 3,
but missed in line2.
$clang++ -c bug.cc
<source>:2:32: error: cannot template a using declaration
extern "C" {template <class> using g_namespace;}
~~~~~~~~~~~~~~~~~ ^
<source>:3:14: error: templates must have C++ linkage
extern "C" {template <class> void foo(){}}
^~~~~~~~~~~~~~~~~
<source>:3:1: note: extern "C" language linkage specification begins here
extern "C" {template <class> void foo(){}}
^
2 errors generated.
While in GCC and msvc, they all give two error messages in line 2 and 3 that
indicates "template with C linkage" is wrong.
Reproduced in godbolt : https://godbolt.org/z/B-KzLw
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