The c89/cc/c++ commands use a number of environment variables. The default values are specified as comments in the /samples/profile file that is shipped with each release. The environment variables for:

• c89 begin with the prefix _C89
• cc begin with the prefix _CC
• c++ begin with the prefix _CXX

If the C/C++ Class Library DLLS are used in building your executables (the default for the c++ command), then this will also target your executable for the same level of C/C++ Class Library