Test Compiler

本文探讨了C语言中预处理指令的使用方法,重点介绍了宏定义与文件包含的用法,并通过具体示例展示了如何避免重复包含以及如何正确地使用宏定义。

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#ifndef A
#define A
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#undef A
#endif

#ifndef B
#define B
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#undef B
#endif

#ifndef B
#define B
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#undef B
#endif

#ifndef C
#define C
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#undef C
#endif

#ifndef D
#define D
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#undef D
#endif

#ifndef E
#define E
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#undef E
#endif
#ifndef F
#define F
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#include __FILE__
#undef F
#endif


#ifndef MAIN
#define MAIN
int main()
{}
#endif

ubuntu@ubuntu:~/PX4_Firmware$ make px4_sitl_default gazebo [0/724] git submodule Tools/sitl_gazebo [6/724] Performing configure step for 'sitl_gazebo' -- install-prefix: /usr/local -- The C compiler identification is GNU 7.5.0 -- The CXX compiler identification is GNU 7.5.0 -- 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 -- Check for working CXX compiler: /usr/bin/c++ -- Check for working CXX compiler: /usr/bin/c++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done -- Performing Test COMPILER_SUPPORTS_CXX17 -- Performing Test COMPILER_SUPPORTS_CXX17 - Success -- Performing Test COMPILER_SUPPORTS_CXX14 -- Performing Test COMPILER_SUPPORTS_CXX14 - Success -- Performing Test COMPILER_SUPPORTS_CXX11 -- Performing Test COMPILER_SUPPORTS_CXX11 - Success -- Performing Test COMPILER_SUPPORTS_CXX0X -- Performing Test COMPILER_SUPPORTS_CXX0X - Success -- Using C++17 compiler -- Looking for pthread.h -- Looking for pthread.h - found -- Performing Test CMAKE_HAVE_LIBC_PTHREAD -- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed -- Looking for pthread_create in pthreads -- Looking for pthread_create in pthreads - not found -- Looking for pthread_create in pthread -- Looking for pthread_create in pthread - found -- Found Threads: TRUE -- Found Boost: /usr/include (found suitable version "1.65.1", minimum required is "1.58") found components: system thread filesystem chrono date_time atomic CMake Error at CMakeLists.txt:32 (find_package): By not providing "Findgazebo.cmake" in CMAKE_MODULE_PATH this project has asked CMake to find a package configuration file provided by "gazebo", but CMake did not find one. Could not find a package configuration file provided by "gazebo
03-17
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