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