1、CMake Error: The following variables are used in this project, but they are set to NOTFOUND.

这个是绑定库时，找不到库报的错误。

例如：

cmake_minimum_required (VERSION 2.8)

project (demo)

#指定执行文件路径
set (EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)

set (SRC_LIST ${PROJECT_SOURCE_DIR}/src/main.c)
find_library(TESTFUNC_LIB testFunc HINTS ${PROJECT_SOURCE_DIR}/lib)
add_executable (main ${SRC_LIST})
target_link_libraries (main ${TESTFUNC_LIB})

当lib文件下有库时，

可以编译过。

当把这两个文件删掉时，就会报错：

CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
TESTFUNC_LIB
    linked by target "main" in directory /home/wang/Desktop/myCCPrimer/others/cMake

-- Configuring incomplete, errors occurred!
See also "/home/wang/Desktop/myCCPrimer/others/cMake/CMakeFiles/CMakeOutput.log".

2、

CMake Error at CMakeLists.txt:18 (add_library):
  Cannot find source file:

    $(SRC_LIST)

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


CMake Error: CMake can not determine linker language for target: testFunc_shared

找不到源文件，原因:使用变量时，${变量=}写成了$(变量)。

add_library(testFunc_shared SHARED ${SRC_LIST})   （正确）
写成了：
add_library(testFunc_shared SHARED $(SRC_LIST))    (错误）

3、Re-run cmake with a different source directory.

解决方案：将build里面编译的文件全部删掉即可。