Wrong include headers for uuid on Ubuntu 18.04

[osrf-migration]

Original report (archived issue) by Silvio Traversaro (Bitbucket: traversaro).

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Prerequisites

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  • Checked that there is not already an Ignition package that provides the described functionality: https://ignitionrobotics.org/libs

Description

On Ubuntu 18.04, ignition-transport4 includes the uuid/uuid.h, but it should include directly the uuid.h file as the UUID include directories are <prefix>/include/uuid, not <prefix>/include.

Steps to Reproduce

1. Inspect the UUID_INCLUDE_DIRS CMake variable.

Expected behavior:

It should contain a directory that contains a uuid/uuid.h file, that is then included in https://github.com/ignitionrobotics/ign-transport/blob/a9318bdb9a233e32a27bbe71f99d534b23315b7a/include/ignition/transport/Uuid.hh#L32 .

Actual behavior:

The directory contains a uuid.h file .

Reproduces how often:

All the time.

Versions

Ubuntu 18.04, ignition-transport 4.

Additional Information

The problem does not emerge because uuid is tipically installed either in the system prefix /usr or it shares the prefix with other dependencies, and so the <prefix>/include directory is added to the include paths in any case. However it could create problems if uuid is installed in a separated prefix.