[Buildroot] [PATCH v3, 3/6] package/collectd: add DPDK_TELEMETRY option

[Yann E. MORIN <yann.morin.1998@free.fr>]

Fabrice, All,

+Peter, +Thomas, +Arnout for your feedback below...

On 2020-04-15 08:30 +0200, Fabrice Fontaine spake thusly:
> DPDK support is available since version 5.11.0 and
> https://github.com/collectd/collectd/commit/00cbd4d2c016a676db476ae66bbc58d6bf11a6a0
> 
> It depends on jansson and is currently enabled by default raising the
> following build failure on musl:
> 
> src/dpdk_telemetry.c:43:10: fatal error: sys/unistd.h: No such file or directory
>  #include <sys/unistd.h>
>           ^~~~~~~~~~~~~~
> 
> Fixes:
>  - autobuild.buildroot.org/results/aafb8c72f147fefc7a988c45e4dc17de48b07a95
> 
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
> ---
>  ...c-dpdk_telemetry.c-fix-build-on-musl.patch | 37 +++++++++++++++++++
>  package/collectd/Config.in                    |  7 ++++
>  package/collectd/collectd.mk                  |  5 +++
>  3 files changed, 49 insertions(+)
>  create mode 100644 package/collectd/0001-src-dpdk_telemetry.c-fix-build-on-musl.patch
> 
[--SNIP--]
> diff --git a/package/collectd/collectd.mk b/package/collectd/collectd.mk
> index 24cdad7e1b..52b218e139 100644
> --- a/package/collectd/collectd.mk
> +++ b/package/collectd/collectd.mk
> @@ -66,6 +66,7 @@ COLLECTD_CONF_OPTS += \
>  	$(if $(BR2_PACKAGE_COLLECTD_DF),--enable-df,--disable-df) \
>  	$(if $(BR2_PACKAGE_COLLECTD_DISK),--enable-disk,--disable-disk) \
>  	$(if $(BR2_PACKAGE_COLLECTD_DNS),--enable-dns,--disable-dns) \
> +	$(if $(BR2_PACKAGE_COLLECTD_DPDK_TELEMETRY),--enable-dpdk_telemetry,--disable-dpdk_telemetry) \
>  	$(if $(BR2_PACKAGE_COLLECTD_DRBD),--enable-drbd,--disable-drbd) \
>  	$(if $(BR2_PACKAGE_COLLECTD_EMPTY_COUNTER),--enable-match_empty_counter,--disable-match_empty_counter) \
>  	$(if $(BR2_PACKAGE_COLLECTD_ENTROPY),--enable-entropy,--disable-entropy) \
> @@ -156,6 +157,7 @@ COLLECTD_DEPENDENCIES = \
>  	$(if $(BR2_PACKAGE_COLLECTD_CURL_JSON),libcurl yajl) \
>  	$(if $(BR2_PACKAGE_COLLECTD_CURL_XML),libcurl libxml2) \
>  	$(if $(BR2_PACKAGE_COLLECTD_DNS),libpcap) \
> +	$(if $(BR2_PACKAGE_COLLECTD_DPKD_TELEMETRY),jansson) \
>  	$(if $(BR2_PACKAGE_COLLECTD_GPS),gpsd) \
>  	$(if $(BR2_PACKAGE_COLLECTD_GRPC),grpc) \
>  	$(if $(BR2_PACKAGE_COLLECTD_IPTABLES),iptables) \
> @@ -186,6 +188,9 @@ COLLECTD_DEPENDENCIES = \
>  ifeq ($(BR2_PACKAGE_GRPC),y)
>  COLLECTD_CONF_OPTS += --with-libgrpc++=$(STAGING_DIR)/usr
>  endif
> +ifeq ($(BR2_PACKAGE_JANSSON),y)
> +COLLECTD_CONF_OPTS += --with-libjansson=$(STAGING_DIR)/usr
> +endif

This code is bugging me: it decorelates the --enable/disable options,
the dependencies and the --with option.

With this patch, this means that is jansoon is enabled, but DPDK
telemetry is not, then we still pass --with-libjansson.

I think the $(if blabla,--enable-bla,--disable-bla) construct should be
limited to thos options that do not require a dependency or another
--with option. If it does, then we should revert to using the
traditional conditional block:

    ifeq ($(BR2_PACKAGE_COLLECTD_DPDK_TELEMETRY),y)
    COLLECTD_DEPENDENCIES += jansson
    COLLECTD_CONF_OPTS += --enable-dpdk_telemetry --with-libjansson=$(STAGING_DIR)/usr
    else
    COLLECTD_CONF_OPTS += --disable-dpdk_telemetr
    endif

I know you mimicked the existing code, but short of fixing it, could you
please respin patches 3-6 with that in mind, pretty please? But first
wait a bit for another maintainer to expres their opionion: Peter,
Thomas, Arnout: what's your feeling?

Regards,
Yann E. MORIN.

>  ifeq ($(BR2_PACKAGE_LIBCURL),y)
>  COLLECTD_CONF_OPTS += --with-libcurl=$(STAGING_DIR)/usr
>  endif
> -- 
> 2.25.1
> 
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