FTBFS libi2c detection is broken

[Christian Ehrhardt ]

Hi,
I ran into this FTBFS when I wanted to rebuild in Ubuntu to pick up the new DPDK 17.11.

  error: 'i2c_smbus_read_i2c_block_data' undeclared (first use in this
function); did you mean 'i2c_smbus_ioctl_data'?

Upstream in i2c this came by the change:

  commit 251d594fd0d338c7b85707a2e72153a404a25b10
  Author: Jean Delvare <email address hidden>
  Date: Mon May 21 16:52:48 2012 +0000

    New library for I2C device access under Linux. As a first step, the
    library will host the i2c_smbus_*() inline functions which were
    previously in the user-space flavor of <linux/i2c-dev.h>.

I reported the issue upstream so they can add a proper toleration for the change in the i2c lib.

Short term the following does the trick to get it building at least (obviously without i2c&barometer):
  confflags += --disable-barometer

[Launchpad Janitor (janitor)]

This bug was fixed in the package collectd - 5.7.2-2ubuntu1

---------------
collectd (5.7.2-2ubuntu1) bionic; urgency=medium

  * d/p/fix-i2c-detection.patch fix i2c usage for 4.0 (LP: #1742691)
    - d/control: bump libi2c-dev version dependency
  * d/rules: fix FTBFS due to liblvm2app deprecation (LP: #1742690)
    by disabling preprocessor warnings.
  * implicitly rebuilds to pick up DPDK 17.11 (LP: #1741208)
  * d/p/CVE-2017-16820-snmp-plugin-Fix-double-free-of-request-PDU.patch
    backport from upstream (Closes: #881757, CVE-2017-16820).

 -- Christian Ehrhardt <email address hidden> Thu, 11 Jan 2018 14:33:20 +0100