arm-linux-gnueabihf-pkg-config does not work with sysroots installed by `ade`

Images versions

apertis-17.06-sdk-amd64-uefi_20170412.0

Steps to reproduce

ade sysroot install
arm-linux-gnueabihf-pkg-config --cflags freetype2

Expected result

-I/opt/sysroot/apertis/17.03/armhf/usr/include/freetype2 -I/opt/sysroot/apertis/17.03/armhf/usr/include/libpng12

Actual result

Package freetype2 was not found in the pkg-config search path.
Perhaps you should add the directory containing `freetype2.pc'
to the PKG_CONFIG_PATH environment variable
No package 'freetype2' found

Impact of bug

Minor impact, only manual cross-building using arm-linux-gnueabihf-pkg-config is affected.

The ade tool is not affected because it calls pkg-config directly, setting up the env vars on its own.

A possible solution would be to provide an ade pkg-config that use the existing mechanisms to choose the sysroot used by the other ade subcommands, and have arm-linux-gnueabihf-pkg-config be a wrapper around it, for the projects that cannot use ade configure because they don't use autotools (eg. cmake).

Attachments

None

Management data

This section is for management only, it should be the last one in the description.

Phabricator link: https://phabricator.apertis.org/T3920