Roland Kaufmann
d847e10d96
Do not warn if just def'ed HAVE_ vars are set to 1
...
Some configuration scripts probe and just set HAVE_FOO without any
values, whereas others set it explicitly to 1. If these two are mixed,
for instance that the same package is used by two of our prerequisites,
but in different manner, then we get compatibility warnings when we try
to run the configuration script, even though there is no real conflict.
dune-fem, dune-alugrid and dune-localfunctions have this problem (around
release 2018.04).
This patch special-code the test so if the old value was previously
either just defined or explicitly set to the value 1, a warning will not
be issued if then suddenly the other variant is used.
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