Composite Environments

Complex environments can be built via composition; use the operator "+" with ves.

For example, if you there are two environments E1 and E2, they can be combined by switching to the environment E1+E2 as shown below:

% ves E1+E2

Order of Environment Components

The order of the environment components in environments is significant, because some environment definitions can be destructive, while others may be in conflict with each other.

For example, the environment BASE sets the variable PATH to a well-defined list of directories, ignoring any previous value. For this variable, the environments BASE and E1+BASE are identical, because it is completely determined by the BASE environment. Note that in general, the environment BASE+E1 is a true composite environment (assuming that E1 is not destructive).

For example, to use tools from Synopsys and Virage, they can be run in the combined environment SYNOPSYS+VIRAGE as shown below:

mars chip@mercury BASE src/vhdl > ves SYNOPSYS+VIRAGE
mars chip@mercury SYNOPSYS+VIRAGE src/vhdl >