In e8b6b7a, we relaxed the cmake version check down to 3.1, the first
version to expose target_compile_features().
However, an error while testing that change improperly concluded that
the change was OK. While target_compile_features() was indeed introduced
in cmake 3.1, the actual feature we use it to test, cxx_std_11, was
really introduced only with cmake-3.8, which explained the actual
version that was requested before e8b6b7a.
Coming up with a working test is not as trivial as initially thought, so
a better solution will have to be devised in the future. In the mean
time, revert to the previously-working situation.
This reverts commit e8b6b7adc1.
Reported-by: Patrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
9763333e63