ENVΒΆ
Operator to read environment variables.
Use the syntax $ENV{VAR} to read environment variable VAR.
To test whether an environment variable is defined, use the signature
if(DEFINED ENV{<name>}) of the if() command.
Note
Environment variable names containing special characters like parentheses
may need to be escaped. (Policy CMP0053 must also be enabled.)
For example, to get the value of the Windows environment variable
ProgramFiles(x86), use:
set(ProgramFiles_x86 "$ENV{ProgramFiles\(x86\)}")
For general information on environment variables, see the
Environment Variables
section in the cmake-language(7) manual.