61 lines
1.7 KiB
ReStructuredText
61 lines
1.7 KiB
ReStructuredText
=====
|
|
libxx
|
|
=====
|
|
|
|
This directory contains three C++ library:
|
|
|
|
- A fragmentary C++ library that will allow to build only the simplest of
|
|
C++ applications. In the deeply embedded world, that is probably all
|
|
that is necessary.
|
|
|
|
At present, only the following are supported here:
|
|
|
|
.. code-block:: C
|
|
|
|
void *operator new(std::size_t nbytes)
|
|
|
|
.. code-block:: C
|
|
|
|
void operator delete(void* ptr)
|
|
|
|
.. code-block:: C
|
|
|
|
void operator delete[](void *ptr)
|
|
|
|
.. code-block:: C
|
|
|
|
void __cxa_pure_virtual(void)
|
|
|
|
.. code-block:: C
|
|
|
|
int __aeabi_atexit(void* object, void (*destroyer)(void*), void *dso_handle)
|
|
|
|
.. code-block:: C
|
|
|
|
int __cxa_atexit(__cxa_exitfunc_t func, FAR void *arg, FAR void *dso_handle)
|
|
|
|
This implementation is selected when neither of the following
|
|
two options are enabled.
|
|
|
|
- LLVM "libc++" C++ library (http://libcxx.llvm.org/)
|
|
This implementation is selected with CONFIG_LIBCXX=y.
|
|
|
|
- uClibc++ C++ library (http://cxx.uclibc.org/)
|
|
This implementation is selected with CONFIG_UCLIBCXX=y.
|
|
|
|
operator new
|
|
------------
|
|
|
|
This operator should take a type of ``size_t``. But size_t has an unknown underlying
|
|
type. In the nuttx ``sys/types.h`` header file, ``size_t`` is typed as ``uint32_t``
|
|
(which is determined by architecture-specific logic). But the C++
|
|
compiler may believe that ``size_t`` is of a different type resulting in
|
|
compilation errors in the operator. Using the underlying integer type
|
|
instead of size_t seems to resolve the compilation issues. Need to
|
|
REVISIT this.
|
|
|
|
Once some C++ compilers, this will cause an error::
|
|
|
|
Problem: "'operator new' takes size_t ('...') as first parameter"
|
|
Workaround: Add -fpermissive to the compilation flags
|