[untitled] use of cmake

1. Single directory single file

 Insert a code chip here 
CMAKE_MINIMUM_REQUIRED(VERSION 3.10) # Declare the minimum required to compile the code Cmake edition 
PROJECT(demo1) ## Name of the project to compile 
ADD_EXECUTABLE(demo1 main.cpp)##demo1 The name of the executable file generated for is demo1.exe main.cpp For the object to compile , File dependency 

2. Single directory and multiple files

#AUX_SOURCE_DIRECTORY(dir VAR)
# Find all source code files in a directory and store the list in a variable 
# Assign all the source file names in the current directory to the variable DIR_HELLO_SRCS
AUX_SOURCE_DIRECTORY(./ DIR_SRCS)
ADD_EXECUTABLE(demo2 ${
    DIR_SRCS})

3. Multiple directories and multiple files （ The source file is in the top-level directory ）
First write the CMakeLists.txt

# Find all source code files in a directory and store the list in a variable 
AUX_SOURCE_DIRECTORY(. DIR_LIB_SRCS)
# Set the file to be called by the main function under the subdirectory as the static library 
ADD_LIBRARY(Mylib STATIC ${
    DIR_LIBSRCS})
# Or set it as a dynamic library 
ADD_LIBRARY(Mylib SHARED ${
    DIR_LIBSRCS})

Next, write the top-level directory

CMAKE_MINIMUM_REQUIRED(VERSION 3.1)

PROJECT(demo3)
# Add subdirectories , That is, the name of other folders 
ADD_SUBDIRECTORY(./mylib)

AUX_SOURCE_DIRECTORY(./ DIR_SRCS)

ADD_EXECUTABLE(demo3  ${
    DIR_SRCS})
demo3 Is the name of the executable  Mylib Name of the generated static library   Link to the executable 
TARGET_LINK_LIBRARIES(demo3 Mylib)

4. Multiple directories and multiple files ( standard That is, a folder of source files src Library files a folder mylib camke File a folder build )
stay demo3 On the basis of Write in the source folder CMakeLists.txt

# Be similar to stm32 If you want to add header file , Get a magic wand to increase the header file path 
#${
    PROJECT_SOURCE_DIR} Indicates the root directory path   You can use . Instead of 
# Here is the path of the library file 
INCLUDE_DIRECTORIES(${
    PROJECT_SOURCE_DIR}/mylib)
AUX_SOURCE_DIRECTORY(./ DIR_SRCS)

ADD_EXECUTABLE(demo4 ${
    DIR_SRCS})

TARGET_LINK_LIBRARIES(demo4 Mylib)

Write in top-level file CMakeLists.txt

CMAKE_MINIMUM_REQUIRED(VERSION 3.10)

PROJECT(demo4)

ADD_SUBDIRECTORY(./mylib)
 Add the source file path in the project 
ADD_SUBDIRECTORY(./src)

And then in build Execute under the document cmake
2. improvement
In the library file CMakeLists Add such a sentence

AUX_SOURCE_DIRECTORY(. DIR_LIB_SRCS)
# Generate library files Mylib.a File placement path 
# ${
    PROJECT_BINARY_DIR} stay build perform cmake, So for build File path 
SET(LIBRARY_OUTPUT_PATH ${
    PROJECT_BINARY_DIR}/lib)
ADD_LIBRARY(Mylib STATIC ${
    DIR_LIBSRCS})

In the source file CMakeLists Add such a sentence

INCLUDE_DIRECTORIES(${
    PROJECT_SOURCE_DIR}/mylib)

SET(EXECUTABLE_OUTPUT_PATH ${
    PROJECT_BINARY_DIR}/bin)

AUX_SOURCE_DIRECTORY(./ DIR_SRCS)

ADD_EXECUTABLE(demo4 ${
    DIR_SRCS})

TARGET_LINK_LIBRARIES(demo4 Mylib)