Re: Simple Xenomai 4 API use examples and a question

[Philippe Gerum <rpm@xenomai.org>]

Emmanuel Pacaud <emmanuel.pacaud@lapp.in2p3.fr> writes:

> [1. text/markdown]
> Le vendredi 22 août 2025 à 09:13 +0200, Emmanuel Pacaud a écrit :
>> I have started to work on a repository which is intended as a collection of very simple (dumb) examples of Xenomai 4 API use. Each example is an application, sometimes coupled with a kernel module, with the strict minimum around the actual API use. Applications and kernel modules are built using meson. The meson files are also kept the their simplest form. That was easy for the application building, not so for the kernel modules.
>
> In my quest of the simplest example, there is this line in <https://gitlab.com/emmanuelpacaud/xenomai-c-examples/-/blob/8253729aa3eb669576e387bba80085c91199f3cf/meson.build>:
>
> ```
> exe = executable (e, e + '.c',
>                   dependencies: evl_dep,
>                   c_args:   ['-I' + evl_dep.get_pkgconfig_variable('includedir') 'uapi'],
>                   install: true)
> ```
>
> In my setup, I, don't install kernel user space API headers, as it is a diskless one, where I want to be able to switch between different kernels. So I let install-uapi enabled, which means *-abi.h files are installed in $prefix/include/uapi. Which means I have to add this path to the include path manually, as it is not present in the pkg config file, using c_args parameter.
>
> Is it intended ? I would have expected them to be installed along the other libevl headers. If so, I think the C flags in pkg config file should include $includedir/uapi, when install-uapi option is enabled.
>
> Emmanuel.

Since ABI 42 guarantees that we have no naming conflict anymore thanks
to the -abi.h suffix for those headers, we can merge them with the
common library headers, leaving the evl.pc generation as is. I'm pushing
the following change to the -next branch to address this:

diff --git a/meson/install-uapi.sh b/meson/install-uapi.sh
index 333122b..2ccee5e 100644
--- a/meson/install-uapi.sh
+++ b/meson/install-uapi.sh
@@ -3,4 +3,4 @@
 # $2 = $includedir
 
 cd $1
-find -L evl \! \( -name '*~' \) -type f | cpio -pdum --quiet $MESON_INSTALL_DESTDIR_PREFIX/$2/uapi
+find -L evl \! \( -name '*~' \) -type f | cpio -pdum --quiet $MESON_INSTALL_DESTDIR_PREFIX/$2

Please let me know if that fixes the issue on your end.

-- 
Philippe.