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libxx: Update README

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This doc seems a bit outdated to me.
This commit is my best attempt to update it.
This commit is contained in:
YAMAMOTO Takashi 2020-10-23 15:05:17 +09:00 committed by Brennan Ashton
parent 1aed34182a
commit caf67c817f
1 changed files with 33 additions and 17 deletions
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50
libs/libxx/README.txt
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@ -1,28 +1,44 @@
libs/libxx/README.txt
^^^^^^^^^^^^^^^^^^^^^
This directory contains 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. If you have a need for more extensive
C++ support, the following libraries are recommended:
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:
- void *operator new(std::size_t nbytes);
- void operator delete(void* ptr);
- void operator delete[](void *ptr);
- void __cxa_pure_virtual(void);
- int __aeabi_atexit(void* object, void (*destroyer)(void*),
void *dso_handle);
- 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.
If you have a need for more extensive C++ support, the following
libraries might be usable too:
- libstdc++ (part of GCC)
- STLport http://www.stlport.org/
- uClibc++ http://cxx.uclibc.org/
- uSTL http://ustl.sourceforge.net/
There is a version of uClibc++ that has been customized for use with NuttX.
That version that can be found in the NuttX uClibc++ GIT repository. Refer
to the top-level uClibc++ README.txt file for installation instructions.
At present, only the following are supported here:
- void *operator new(std::size_t nbytes);
- void operator delete(void* ptr);
- void operator delete[](void *ptr);
- void __cxa_pure_virtual(void);
- int __aeabi_atexit(void* object, void (*destroyer)(void*), void *dso_handle);
- int __cxa_atexit(__cxa_exitfunc_t func, FAR void *arg, FAR void *dso_handle);
There is another version of uClibc++ that has been customized for
use with NuttX. That version that can be found in the NuttX
uClibc++ GIT repository. (https://bitbucket.org/nuttx/uclibc/src/master/)
Refer to the top-level uClibc++ README.txt file for installation
instructions.
operator new
------------