sastel commented on issue #12362:
URL: https://github.com/apache/nuttx/issues/12362#issuecomment-2135118932
> How do you go about installing other Conan packages ? From what I can see
you are building nuttx using Conan but what if your application needs other
Conan packages like eigen which requires the nuttx toolchain otherwise your
final nuttx application that requires nuttx and eigen won't really work. How do
you inject the nuttx toolchain in the Conan profile on the fly?
I tried including Eigen 3.4.0 from conancenter just now, and the answer is
that you specify Eigen in the requires section of the recipe that needs it, and
ensure that your host profile mentions nuttxpkg as a tool_require. The host
profile gets applied to all of the dependencies including Eigen. Because of the
following snippet in the nuttxpkg recipe, the toolchain.cmake file gets applied
to any project that uses nuttxpkg as a tool require.
```python
def package_info(self):
# Later packages get access to the NuttX export not by
find_package() in CMake,
# but through the conan_toolchain.cmake file which includes the
toolchain.cmake
# from NuttX. This means that all builds which mark this package as a
# tool_requires will include the NuttX headers and link against the
NuttX libs.
toolchain = os.path.join(self.package_folder,
"nuttx-export-12.5.0/scripts/toolchain.cmake")
self.conf_info.append("tools.cmake.cmaketoolchain:user_toolchain",
toolchain)
```
I didn't have to modify the Eigen package at all, and it is including the
POSIX headers from nuttxpkg. See this graph from the `conan graph info`
command. (Note that the dependency tree isn't quite complete, because nuttxpkg
should be showing a dependency on my xpack compiler package, but isn't yet
because I didn't form the xpack package correctly).
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