g2gps opened a new pull request, #8173:
URL: https://github.com/apache/nuttx/pull/8173
## Summary
Upgrade of LLVM libcxx from 12.0.0 to 14.0.6 in order to take advantage of
newer features and fixes. See #7105 for previous discussion.
## Impact
Changes to the Nuttx tree are relatively minimal. However, there are a
couple of new patches applied to libcxx in order to get the build working with
c++17, c++14 and c++11. It is a possible that there are additional options that
could be applied to `__config_site` which would remove this requirement.
Although there is nothing obvious which stands out to me. Feedback or guidance
in relation to this would be appreciated.
## Testing
I've performed testing using `sim:libcxxtest` configuration, whilst setting
the `CONFIG_CXX_STANDARD` to:
- c++11
- c++14
- c++17
- c++20
Attempting to build with c++98 fails miserably. Although this was also the
case with libcxx `12.0.0`.
A sample of the output from `cxxtest`, with `CONFIG_CXX_STANDARD` set to
c++17, the default value is:
```
nsh> cxxtest
load_absmodule: Loading /bin/cxxtest
builtin_loadbinary: Loading file: /bin/cxxtest
load_absmodule: Successfully loaded module /bin/cxxtest
binfmt_dumpmodule: Module:
binfmt_dumpmodule: entrypt: 0x55786b3b92e6
binfmt_dumpmodule: mapped: 0 size=0
binfmt_dumpmodule: alloc: 0 0 0
binfmt_dumpmodule: stacksize: 2048
binfmt_dumpmodule: stackaddr: 0
binfmt_dumpmodule: unload: 0
exec_module: Executing cxxtest
Test ofstream ================================
printf: Starting test_ostream
printf: Successfully opened /dev/console
cout: Successfully opened /dev/console
Writing this to /dev/console
Test iostream ================================
Hello, this is only a test
Print an int: 190
Print a char: d
Test std::vector =============================
v1=1 2 3
Hello World Good Luck
Test std::map ================================
Test C++17 features ==========================
File /proc/meminfo exists!
Invalid file! /invalid
File /proc/version exists!
Test RTTI ====================================
extend
Test Exception ===============================
Catch exception: runtime error
nsh>
```
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