[LLVMbugs] [Bug 19923] New: Member functions of class templates not instantiated despite [[gnu::used]]

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19923

            Bug ID: 19923
           Summary: Member functions of class templates not instantiated
                    despite [[gnu::used]]
           Product: clang
           Version: 3.4
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvm-bugs at quasiparticle.net
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

In a class template, g++ instantiates member functions marked with
[[gnu::used]] even when those functions are used nowhere in the program. clang
does not. This causes code to compile that doesn't compile on g++, e.g.

#include <type_traits>

template<class I>
class X {
  [[gnu::used]]
  static void check() {
    static_assert(std::is_enum<I>::value, "");
  }
};

X<int> x;

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