[cmake-developers] Fwd: CMake System Prefix Path

[Stephen Kelly]

Forwarding this for Ben.

Would it be reasonable to have a way to not add the CMAKE_INSTALL_PREFIX
to the CMAKE_SYSTEM_PREFIX_PATH?

The install prefix is not cleared before the CI build on build.kde.org
because the dependency graph is quite large (everything depends on Qt,
most things depend on kdelibs, some things depend on kdepimlibs etc).

Successful builds are uploaded to a master server and build nodes will
re-download that if they have no version of the dependency. That
re-download can be huge and take significant time, so it is avoided by
also not clearing the install prefix on each of the build nodes.

Is the only solution to this as Ben describes with
passing NO_CMAKE_SYSTEM_PATH to CMake?

Thanks,

Steve.


-------- Original Message --------
Subject: 	CMake System Prefix Path
Date: 	Tue, 22 Oct 2013 17:03:26 +1300
From: 	Ben Cooksley <bcooksley at kde.org>
To: 	Stephen Kelly <steveire at gmail.com>



Hi Stephen,

It has between pointed out to me on IRC that CMake automatically adds
the install prefix path (CMAKE_INSTALL_PREFIX)
to CMAKE_SYSTEM_PREFIX_PATH - which is included in the paths searched.

This is rather unfortunate as it interferes in our CI system - we rely
on CMake searching only normal system paths (like /usr) and the paths we
specify (via CMAKE_PREFIX_PATH) in order to ensure our builds are clean.
This means kdelibs[frameworks] builds have been succeeding when they
should be failing.

Is there any way around this issue other than ensuring /usr and
/usr/local are included in CMAKE_PREFIX_PATH, and
passing NO_CMAKE_SYSTEM_PATH to CMake?

(As an aside, it seems that something in the stack Grantlee uses is
definitely modifying CMAKE_SYSTEM_PREFIX_PATH as it
contains /srv/jenkins/install/linux/x86_64/g++/common/shared - which is
not the install prefix.

Thanks,
Ben


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