17.29 C++ ABI parameters
Define this hook to override the integer type used for guard variables. These are used to implement one-time construction of static objects. The default is long_long_integer_type_node.
This hook determines how guard variables are used. It should return
false(the default) if first byte should be used. A return value of
trueindicates the least significant bit should be used.
This hook returns the size of the cookie to use when allocating an array whose elements have the indicated type. Assumes that it is already known that a cookie is needed. The default is
max(sizeof (size_t), alignof(type)), as defined in section 2.7 of the IA64/Generic C++ ABI.
This hook should return
trueif the element size should be stored in array cookies. The default is to return
If defined by a backend this hook allows the decision made to export class type to be overruled. Upon entry import_export will contain 1 if the class is going to be exported, −1 if it is going to be imported and 0 otherwise. This function should return the modified value and perform any other actions necessary to support the backend's targeted operating system.
This hook should return
trueif constructors and destructors return the address of the object created/destroyed. The default is to return
This hook returns true if the key method for a class (i.e., the method which, if defined in the current translation unit, causes the virtual table to be emitted) may be an inline function. Under the standard Itanium C++ ABI the key method may be an inline function so long as the function is not declared inline in the class definition. Under some variants of the ABI, an inline function can never be the key method. The default is to return
decl is a virtual table, virtual table table, typeinfo object, or other similar implicit class data object that will be emitted with external linkage in this translation unit. No ELF visibility has been explicitly specified. If the target needs to specify a visibility other than that of the containing class, use this hook to set
This hook returns true (the default) if virtual tables and other similar implicit class data objects are always COMDAT if they have external linkage. If this hook returns false, then class data for classes whose virtual table will be emitted in only one translation unit will not be COMDAT.
This hook returns true (the default) if the RTTI information for the basic types which is defined in the C++ runtime should always be COMDAT, false if it should not be COMDAT.
This hook returns true if
__aeabi_atexit(as defined by the ARM EABI) should be used to register static destructors when -fuse-cxa-atexit is in effect. The default is to return false to use
This hook returns true if the target
atexitfunction can be used in the same manner as
__cxa_atexitto register C++ static destructors. This requires that
atexit-registered functions in shared libraries are run in the correct order when the libraries are unloaded. The default is to return false.