aviralgarg05 commented on PR #18374:
URL: https://github.com/apache/nuttx/pull/18374#issuecomment-3957044729
I reran this through the NuttX app build flow (instead of a standalone
compiler invocation) using a repro app source in
`apps/testing/cxx/cxxtest/cxxtest_main.cxx` with the same include pattern from
#18232 and these config flags enabled:
- `CONFIG_HAVE_CXX=y`
- `CONFIG_HAVE_CXXINITIALIZE=y`
- `CONFIG_LIBCXXTOOLCHAIN=y`
- `CONFIG_LIBSUPCXX_TOOLCHAIN=y`
- `CONFIG_LIBM_TOOLCHAIN=y`
- `CONFIG_TESTING_CXXTEST=y`
Build command used:
```bash
make V=1 APPDIR=/Users/aviralgarg/Everything/apps
TOPDIR=/Users/aviralgarg/Everything/nuttx \
CXX=g++-15 CC=gcc-15 LD=gcc-15
```
### Before this patch
The build fails with the same issue reported:
```text
.../include/c++/15/math.h:38:12: error: 'abs' has not been declared in 'std'
.../include/c++/15/math.h:39:12: error: 'acos' has not been declared in 'std'
.../include/c++/15/math.h:40:12: error: 'asin' has not been declared in 'std'
.../include/c++/15/math.h:41:12: error: 'atan' has not been declared in 'std'
.../include/c++/15/math.h:42:12: error: 'atan2' has not been declared in
'std'
...
```
### After this patch:
Those `std::abs/std::acos/...` errors no longer occur in the app build log.
On my macOS simulator-host setup, the compile then stops later on separate
host header conflicts (`div_t`, `ldiv_t`, `putenv`, `dev_t`, `mode_t`) caused
by mixed Darwin and NuttX libc type declarations in this specific local
environment.
So the remaining failure is a different host-side conflict.
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