[CMake] --warn-uninitialized works in only first configuration

[frodak17]

When you run `cmake --build Build` it doesn't run cmake with the
--warn-uninitialized
if the build files need to be regenerated.  Therefore you don't get the
warnings.

On Tue, Feb 5, 2019 at 12:15 PM Ramold, Felix <Felix.Ramold at kuka.com> wrote:

> It is not a cache variable. Here is an example:
>
> cmake_minimum_required(VERSION 3.10)
> project(TEST_UNINITIALIZED)
>
> file(WRITE dummy.cpp "")
> add_library(dummy dummy.cpp ${UNINITIALIZED})
>
> Also UNINITIALIZED is not added to CMakeCache.txt.
> Calling cmake twice (even without a change to the list) also shows this
> warning.
>
> -----Ursprüngliche Nachricht-----
> Von: Robert Maynard [mailto:robert.maynard at kitware.com]
> Gesendet: Montag, 4. Februar 2019 18:16
> An: Ramold, Felix
> Cc: cmake at cmake.org
> Betreff: Re: [CMake] --warn-uninitialized works in only first configuration
>
> This generally occurs with CACHE variables as for non first runs they
> exist in the cache and therefore are initialized.
>
> On Mon, Feb 4, 2019 at 10:16 AM Ramold, Felix <Felix.Ramold at kuka.com>
> wrote:
> >
> > Hi,
> >
> >
> >
> > I configure a project with --warn-uninitialized and get a lot of
> warnings. I successfully run the build.
> >
> > Then I change any CMakeLists.txt file. I run the build again. CMake
> checks its dependencies and reconfigures before the actual build.
> >
> > Those warnings (or at least those in the edited file) don’t appear again.
> >
> > Is this the standard behavior?
> >
> >
> >
> > Thanks,
> >
> > Felix
> >
> > --
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