g2gps commented on PR #8173:
URL: https://github.com/apache/nuttx/pull/8173#issuecomment-1397810269
> Could you give a list of the function not implemented by NuttX yet. I can
take time to implement them.
The complete list of unimplemented functions is:
```c
int at_quick_exit(void (*func)(void))
void quick_exit(int status);
int openat(int dirfd, const char *pathname, int flags);
int unlinkat(int dirfd, const char *pathname, int flags);
```
There is alternate implementation in libcxx for `__remove_all` which removes
the need for `openat` and `unlinkat`. This is enabled with `#define
REMOVE_ALL_USE_DIRECTORY_ITERATOR`, which I had previously added to
`__config_site`.
For `at_quick_exit` and `quick_exit`, there either needs to be
implementations in NuttX, or they are patched out. Like so:
```diff
diff --git a/libcxx/include/cstdlib b/libcxx/include/cstdlib
index 457c31f625d8..40ecdfac969d 100644
--- a/libcxx/include/cstdlib
+++ b/libcxx/include/cstdlib
@@ -132,8 +132,8 @@ using ::wctomb _LIBCPP_USING_IF_EXISTS;
using ::mbstowcs _LIBCPP_USING_IF_EXISTS;
using ::wcstombs _LIBCPP_USING_IF_EXISTS;
#if !defined(_LIBCPP_CXX03_LANG)
-using ::at_quick_exit _LIBCPP_USING_IF_EXISTS;
-using ::quick_exit _LIBCPP_USING_IF_EXISTS;
+// using ::at_quick_exit _LIBCPP_USING_IF_EXISTS;
+// using ::quick_exit _LIBCPP_USING_IF_EXISTS;
#endif
#if _LIBCPP_STD_VER > 14
using ::aligned_alloc _LIBCPP_USING_IF_EXISTS;
```
If the above is done, cxxlib version `15.0.7` works with c++20, with no
further modification. The patch I added previously still needs to be used in
order to support c++17.
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