关于CMakeLists的一些问题

刚接触cmake，遇到奇怪的现象，根据网上的例子编写简单的CmakeLists，同级目录只有一个文件main.c

PROJECT (HELLO)
SET(SRC_LIST main.c)
MESSAGE(STATUS "This is BINARY dir " ${HELLO_BINARY_DIR})
MESSAGE(STATUS "This is SOURCE dir "${HELLO_SOURCE_DIR})
MESSAGE(STATUS "This is SRC_LIST "${SRC_LIST})
ADD_EXECUTABLE(hello SRC_LIST)

运行cmake ./的时候报错

CMake Warning (dev) at CMakeLists.txt:4:
  Syntax Warning in cmake code at column 37

  Argument not separated from preceding token by whitespace.
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) at CMakeLists.txt:5:
  Syntax Warning in cmake code at column 35

  Argument not separated from preceding token by whitespace.
This warning is for project developers.  Use -Wno-dev to suppress it.

-- This is BINARY dir /home/user/workspace/tmp/backup/cmake/t1
-- This is SOURCE dir /home/user/workspace/tmp/backup/cmake/t1
-- This is SRC_LIST main.c
-- Configuring done
CMake Error at CMakeLists.txt:6 (ADD_EXECUTABLE):
  Cannot find source file:

    SRC_LIST

  Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm
  .hpp .hxx .in .txx

CMake Error at CMakeLists.txt:6 (ADD_EXECUTABLE):
  No SOURCES given to target: hello

CMake Generate step failed.  Build files cannot be regenerated correctly.

ADD_EXECUTABLE时我把SRC_LIST换成main.c就通过了
各位老大，这是啥原因啊