[CMake] Forcing ExternalProjects build

[Theodore Papadopoulo]

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Is there a way to force the rebuild of external projects.
By default it seems that nothing is rebuilt (my projects only have
source and build, no updates, install or patches). I have tried to add
the following code:

ExternalProject_Get_Property(${project} stamp_dir)
ExternalProject_Add_Step(${project} forcebuild
        COMMAND ${CMAKE_COMMAND} -E touch_nocreate
"${stamp_dir}/${project}-configure"
        COMMENT "Forcing build step for '${project}'"
        DEPENDEES configure
        DEPENDERS build
        ALWAYS 1
    )

and this kind of works, but not reliably. Sometimes the build is made
and sometimes not. It seems that I need some time between touching a
file and launching the build command...
The same thing happens if I replace ${project}-configure by
${project}-patch.

Oh I use ninja in case this is relevant.

Is there a better way to achieve what I want ??

	Thanks

	Theo.
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