https://llvm.org/bugs/show_bug.cgi?id=26262
Bug ID: 26262
Summary: No redeclared exception specification diagnostic for
operator new at C++11
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: unassignedclangb...@nondot.org
Reporter: charles...@playstation.sony.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
This bug has been discovered while updating Lit test
CXX/basic/basic.stc/basic.stc.dynamic/p2.cpp for C++11 compatibility.
The gist of the bug is that when an operator is declared with a throw() then
redeclared without one, the compiler should issue a diagnostic regardless of
operator.
As we shall see in the test case below,
a diagnostic was issues in every case except for operator new at C++11.
Here is the reduced test case.
/****************************************************/
namespace std {
class bad_alloc { };
typedef __SIZE_TYPE__ size_t;
}
void* operator new(std::size_t) throw(std::bad_alloc);
void* operator new(std::size_t);
void operator delete(void*) throw() ;
void operator delete(void*);
/****************************************************/
In C++98, Clang will issue warnings on both the re-decleration of operator new
and operator delete.
$ clang -c nd.cpp -std=c++98 -Wall -fexceptions -frtti
nd.cpp:7:7: warning: 'operator new' is missing exception specification
'throw(std::bad_alloc)'
void* operator new(std::size_t);
^
throw(std::bad_alloc)
nd.cpp:6:7: note: previous declaration is here
void* operator new(std::size_t) throw(std::bad_alloc);
^
nd.cpp:10:6: warning: 'operator delete' is missing exception specification
'throw()'
void operator delete(void*);
^
throw()
nd.cpp:9:6: note: previous declaration is here
void operator delete(void*) throw() ;
^
2 warnings generated.
In C++11, Clang will only issue a warning on the delete operator.
$ cl -c nd.cpp -std=c++11 -Wall -fexceptions -frtti
nd.cpp:10:6: warning: function previously declared with
an explicit exception specification redeclared with
an implicit exception specification [-Wimplicit-exception-spec-mismatch]
void operator delete(void*);
^
nd.cpp:9:6: note: previous declaration is here
void operator delete(void*) throw() ;
^
1 warning generated.
For comparison, GCC (version 4.9.2) issues diagnostics for both
operator new and operator delete at C++98 and C++11
$ gcc -c nd.cpp -std=c++98 -Wall -fexceptions -frtti
nd.cpp:7:31: error: declaration of ‘void* operator new(std::size_t)’ has a
different exception specifier
void* operator new(std::size_t);
^
nd.cpp:6:7: error: from previous declaration ‘void* operator new(std::size_t)
throw (std::bad_alloc)’
void* operator new(std::size_t) throw(std::bad_alloc);
^
nd.cpp:10:27: error: declaration of ‘void operator delete(void*)’ has a
different exception specifier
void operator delete(void*);
^
nd.cpp:9:6: error: from previous declaration ‘void operator delete(void*) throw
()’
void operator delete(void*) throw() ;
^
$ gcc -c nd.cpp -std=c++11 -Wall -fexceptions -frtti
nd.cpp:7:31: error: declaration of ‘void* operator new(std::size_t)’ has a
different exception specifier
void* operator new(std::size_t);
^
nd.cpp:6:7: error: from previous declaration ‘void* operator new(std::size_t)
throw (std::bad_alloc)’
void* operator new(std::size_t) throw(std::bad_alloc);
^
nd.cpp:10:27: error: declaration of ‘void operator delete(void*)’ has a
different exception specifier
void operator delete(void*);
^
nd.cpp:9:6: error: from previous declaration ‘void operator delete(void*) throw
()’
void operator delete(void*) throw() ;
^
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