Hi Stefan,
AFAIK NuttX doesn't have support to export apps side libraries.
Actually it should be nice to have "real" support for libraries on apps/
Makefiles (we could use the approach that Google used originally on Android
Makefiles) since NuttX supports ELF loading for executable and for
libraries (that was contributed by Neal Ferguson from WildernessLabs).
BR,
Alan
On Thu, Aug 7, 2025 at 9:37 AM Štěpán Pressl <nuttx.pressl.ste...@gmail.com>
wrote:
> Hello everyone,
>
> I'm facing a problem whose solution is currently unknown to me. As I am
> using the nuttx export in my development, I'd like to export external
> libraries, which are, in my case, located in apps. As "make export" only
> exports the headers located in nuttx/include, I'd want to ask you whether
> there's already a way to propagate the header files of external libraries
> into export/include, so that the API could be used by the export.
>
> This also concerns the includes of external libraries in other locations,
> such as arch. Also, many external libraries utilize the CFLAGS += -I hack
> to include the external headers. Shouldn't there be a more unified way that
> defines the external headers in a separate variable and the root apps
> makefile just collects this and adds it to CFLAGS, and possibly into the
> export/include directory. But also, there could be some headers that we
> don't want to be visible in the export, but only visible in apps.
>
> For the time being, I've solved this problem by utilizing a
> EXTRA_APPS_INCPATHS Makefile variable, which can be filled with the
> directories in Make.defs files, and the root apps Makefile just copies it
> to export/include:
>
> diff --git a/Makefile b/Makefile
> index 5a3570538..d6e96b068 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -197,6 +197,12 @@ preconfig: Kconfig
> export:
> ifneq ($(EXPORTDIR),)
> $(Q) mkdir -p "${EXPORTDIR}"$(DELIM)registry || exit 1;
> + for d in ${EXTRA_APPS_INCPATHS}; do \
> + if [ -d "$${d}" ]; then \
> + echo "CP: $${d}" ; \
> + cp -r "$${d}" "${EXPORTDIR}"$(DELIM)include ; \
> + fi \
> + done
> ifneq ($(CONFIG_BUILD_KERNEL),y)
> ifneq ($(BUILTIN_REGISTRY),)
> for f in "${BUILTIN_REGISTRY}"$(DELIM)*.bdat
> "${BUILTIN_REGISTRY}"$(DELIM)*.pdat ; do \
>
> Please let me know and I'm looking forward to spark a debate.
> BR,
> Stepan Pressl
>
