<LANG>_STANDARD_REQUIREDΒΆ
The variations are:
These properties specify whether the value of <LANG>_STANDARD is a
requirement. When false or unset, the <LANG>_STANDARD target
property is treated as optional and may "decay" to a previous standard if the
requested standard is not available. When <LANG>_STANDARD_REQUIRED is set
to true, <LANG>_STANDARD becomes a hard requirement and a fatal
error will be issued if that requirement cannot be met.
Note that the actual language standard used may be higher than that specified
by <LANG>_STANDARD, regardless of the value of
<LANG>_STANDARD_REQUIRED. In particular,
transitive usage requirements or the use of
compile features can raise the required
language standard above what <LANG>_STANDARD specifies.
These properties are initialized by the value of the
CMAKE_<LANG>_STANDARD_REQUIRED variable if it is set when a target
is created.
See the cmake-compile-features(7) manual for information on
compile features and a list of supported compilers.