[cmake introduction I] set the project name (project test)

One .project Instruction syntax

in other words : If I define the project name as follows PROJECT(TEST), Then there are four variables associated with this command :

TEST_BINARY_DIR（ Implicitly specify ： Binary file save path ）/TEST_SOURCE_DIR（ Implicitly specify ： Source path ）

PROJECT_BINARY_DIR（ The system orders ）/PROJECT_SOURCE_DIR（ The system orders ）

among ：TEST_BINARY_DIR == PROJECT_BINARY_DIR

among ：TEST_SOURCE_DIR == PROJECT_SOURCE_DIR

however ：TEST_BINARY_DIR And TEST_SOURCE_DIR Not necessarily equal , Depends on internal compilation or Outside