Checking them for being defined would get the user intention wrong if they are passed as -DDISABLE_STATIC=Off as that would still count as being defined. Just check for the variable, which has the desired effect. An unset variable is always false. Since these flags are options now the variables (see #143) are always set, so one cannot disable this features anymore otherwise.
DerDakon
commented
6 years ago
Checking them for being defined would get the user intention wrong if they are passed as -DDISABLE_STATIC=Off as that would still count as being defined. Just check for the variable, which has the desired effect. An unset variable is always false. Since these flags are options now the variables (see #143) are always set, so one cannot disable this features anymore otherwise.