From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [PATCH v9 03/12] telemetry: initial telemetry
	infrastructure
Date: Sat, 27 Oct 2018 03:56:08 +0200
Message-ID: <3436860.VK1RJtmnne@xps>
References: <20181024160311.85457-1-kevin.laatz@intel.com>
 <20181026235933.79779-1-harry.van.haaren@intel.com>
 <20181026235933.79779-4-harry.van.haaren@intel.com>
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Cc: dev@dpdk.org, bruce.richardson@intel.com, stephen@networkplumber.org,
 gaetan.rivet@6wind.com, shreyansh.jain@nxp.com, mattias.ronnblom@ericsson.com,
 Ciara Power <ciara.power@intel.com>, Brian Archbold <brian.archbold@intel.com>
To: Harry van Haaren <harry.van.haaren@intel.com>,
 Kevin Laatz <kevin.laatz@intel.com>, Radu Nicolau <radu.nicolau@intel.com>,
 david.hunt@intel.com
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27/10/2018 01:59, Harry van Haaren:
> --- a/mk/rte.vars.mk
> +++ b/mk/rte.vars.mk
> +JANSSON := $(shell pkg-config --exists jansson; echo $$?)
> +ifneq ($(JANSSON),0)
> +$(warning Jansson not found, disabling RTE_LIBRTE_TELEMETRY)
> +CONFIG_RTE_LIBRTE_TELEMETRY = n
> +endif

It fails for cross-compilation.
Example:
When compiling i686 on x86_64 host, no error with
	pkg-config --exists jansson
but fails when linking:
	/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-linux-gnu/8.2.1/../../../libjansson.so when searching for -ljansson
	/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-pc-linux-gnu/8.2.1/../../../libjansson.a when searching for -ljansson
	/usr/bin/ld: skipping incompatible /usr/lib/libjansson.so when searching for -ljansson
	/usr/bin/ld: skipping incompatible /usr/lib/libjansson.a when searching for -ljansson
	/usr/bin/ld: cannot find -ljansson

Note: there is the same issue with examples/vm_power_manager/Makefile

I start thinking it is not reasonnable to enable an optional dependency
in our Makefiles. Perhaps the only solution is to use meson...