[llvm-bugs] [Bug 25740] New: attribute visibility problems when using operator overloading (new/delete)

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25740

            Bug ID: 25740
           Summary: attribute visibility problems when using operator
                    overloading  (new/delete)
           Product: clang
           Version: 3.7
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kaptain-blaubaer at web.de
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Using this example:

#include <cstdio>
#include <cstdlib>
// replacement of a minimal set of functions:
__attribute__((visibility("hidden")))
void* operator new(std::size_t sz) {
  std::printf("global op new called, size = %zu\n",sz);
  return std::malloc(sz);
}
void operator delete(void* ptr)
{
  std::puts("global op delete called");
  std::free(ptr);
}
int main() {
  int* p1 = new int;
  delete p1;

  int* p2 = new int[10]; // guaranteed to call the replacement in C++11
  delete[] p2;
}


Compilation fails using CLang 3.7.0 and Clang 3.8.0 (trunk):

$ clang  x.cpp -lstdc++
x.cpp:4:16: error: visibility does not match previous declaration
__attribute__((visibility("hidden")))
               ^
note: previous attribute is here
x.cpp:5:7: warning: 'operator new' is missing exception specification
'throw(std::bad_alloc)'
void* operator new(std::size_t sz) {
      ^
                                   throw(std::bad_alloc)
x.cpp:9:6: warning: 'operator delete' is missing exception specification
'throw()'
void operator delete(void* ptr)
     ^
                      throw()
2 warnings and 1 error generated.


But Succeeds using Clang 3.6.2 and 3.5.0:

$ clang  x.cpp -lstdc++
x.cpp:5:7: warning: 'operator new' is missing exception specification
'throw(std::bad_alloc)'
void* operator new(std::size_t sz) {
      ^
                                   throw(std::bad_alloc)
x.cpp:9:6: warning: 'operator delete' is missing exception specification
'throw()'
void operator delete(void* ptr)
     ^
                                throw()
2 warnings generated.

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