我是 CMake 的新手,希望使用一个非常简单的 Raspberry Pi 应用程序作为学习体验。我在一个简单的目录结构中有几个文件,而且我正在使用pigpio。我的代码可以自行编译,但是当我使用 CMake 生成 makefile 时,makefile 在 pigpio 中找不到引用。pigpioFindpigpio.cmake
在util
目录中包含一个文件 , ,所以我尝试将它包含在 中CMakeLists.txt
,但无济于事。
文件结构:
RPapp
├──inc/
| ├──spi.h
| └──gpio.h
├──src/
| ├──spi.c
| ├──gpio.c
| └──main.c
├──pigpio/
| ├──util/
| | ├──Findpigpio.cmake
| | └──[whatever else is in here]
| └──[remainder of code cloned from github]
└──CMakeLists.txt
这是我的CMakeLists.txt
:
cmake_minimum_required(VERSION 3.0.0)
project(RPapp C)
include(pigpio/util/Findpigpio.cmake)
include_directories(inc)
set(CMAKE_C_STANDARD 11)
add_executable(RPapp ${PROJECT_SOURCE_DIR}/src/main.c ${PROJECT_SOURCE_DIR}/src/gpio.c ${PROJECT_SOURCE_DIR}/src/spi.c)
I mkdir _build
、cd _build
和cmake ..
,这给出了非常有希望的输出:
-- The C compiler identification is GNU 8.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Found pigpio: /usr/local/include
-- Configuring done
-- Generating done
-- Build files have been written to: /home/pi/RPapp/_build
但是当我运行make时,输出显示它无法引用pigpio的函数:
Scanning dependencies of target RPapp
[ 25%] Building C object CMakeFiles/RPapp.dir/src/main.c.o
[ 50%] Building C object CMakeFiles/RPapp.dir/src/gpio.c.o
[ 75%] Building C object CMakeFiles/RPapp.dir/src/spi.c.o
[100%] Linking C executable RPapp
/usr/bin/ld: CMakeFiles/RPapp.dir/src/main.c.o: in function `main':
main.c:(.text+0x38): undefined reference to `gpioTerminate'
/usr/bin/ld: CMakeFiles/RPapp.dir/src/main.c.o: in function `buff_rdy_handler':
main.c:(.text+0x88): undefined reference to `spiRead'
...(more of the same)