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CMakeLists.txt是一个用于构建C/C项目的CMake配置文件。它定义了项目的编译选项#xff0c;包括编译器类型、依赖库、预处理宏和子目录等。让我们逐步解析这个文件。
编译器检测
CMAKE_CXX_COMPILER_ID 变量用于检测编译器类型。在这个示例中#xff0…CMakeLists.txt详解
CMakeLists.txt是一个用于构建C/C项目的CMake配置文件。它定义了项目的编译选项包括编译器类型、依赖库、预处理宏和子目录等。让我们逐步解析这个文件。
编译器检测
CMAKE_CXX_COMPILER_ID 变量用于检测编译器类型。在这个示例中如果编译器是Clang则设置 CLANG 为true如果编译器是GCC则设置 GCC 为true。这样可以根据不同的编译器类型设置相关选项。
编译选项
CMakeLists.txt 文件中定义了一系列的编译选项例如
WARNINGS_AS_ERRORS将警告作为错误处理如果启用此选项则在编译过程中遇到任何警告都会导致构建失败。FILTER、ENCODER、DECODER、MUXER、DEMUXER这些选项控制是否编译对应的过滤器、编码器、解码器、复用器和解复用器模块。ROCKFACE、ROCKX、RKNN这些选项控制是否编译rockface、rockx和rknn封装模块。SANITIZER_STATIC、SANITIZER_DYNAMIC这些选项用于在编译时启用地址和内存错误的静态或动态库。RKMEDIA_SOCKET启用RKMedia套接字支持。
依赖库
CMakeLists.txt 文件使用 pkg_check_modules 函数查找并设置依赖库。示例中使用了 LIBDRM 和 LIBION 库。如果找到了这些库则相应地设置预处理宏并包含相关的头文件。
子目录
CMakeLists.txt 文件根据选项编译不同的子目录包括 src 和 examples。在这些子目录中可以编写项目源代码文件和示例代码并设置链接库和其他编译选项。
其他配置
除了上述内容CMakeLists.txt 文件还设置了一些其他配置如设置编译器选项C11标准、禁用RTTI等、预定义目标文件夹等。
下面是示例代码
#
# Copyright 2019 Fuzhou Rockchip Electronics Co., Ltd. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
## vi: set noexpandtab syntaxcmake:message(STATUS cmake version ${CMAKE_VERSION})
if(NOT CMAKE_VERSION VERSION_LESS 2.8.12.20131121)cmake_policy(SET CMP0025 OLD) # report Apples Clang as just Clangcmake_policy(SET CMP0042 OLD) # do not require MACOSX_RPATH
endif()# Search packages for host system instead of packages for target system in case
# of cross compilation these macro should be defined by toolchain file
if(NOT COMMAND find_host_package)macro(find_host_package)find_package(${ARGN})endmacro()
endif()
if(NOT COMMAND find_host_program)macro(find_host_program)find_program(${ARGN})endmacro()
endif()list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)project(easymedia)cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
include(CheckIncludeFiles)
include(CheckFunctionExists)
include(CheckSymbolExists)
include(CheckCXXCompilerFlag)# ----------------------------------------------------------------------------
# set property to classify library kinds
# ----------------------------------------------------------------------------
set_property(GLOBAL PROPERTY USE_FOLDERS ON)
set_property(GLOBAL PROPERTY PREDEFINED_TARGETS_FOLDER CMakeTargets)# ----------------------------------------------------------------------------
# Compiler detection
# ----------------------------------------------------------------------------
if(${CMAKE_CXX_COMPILER_ID} STREQUAL Clang)set(CLANG true)
endif()
if(${CMAKE_CXX_COMPILER_ID} STREQUAL GNU)set(GCC true)
endif()if(CLANG)# treat clang roughly like gccset(GCC true)add_definitions(-Wall-Wextra-Wshadow-ffast-math)
elseif(CMAKE_COMPILER_IS_GNUCXX)add_definitions(-Wall-Wextra-Wshadow-ffast-math)check_cxx_compiler_flag(-Wno-narrowing GCC_HAS_NO_NARROWING)check_cxx_compiler_flag(-mstackrealign GCC_HAS_STACK_REALIGN)if(GCC_HAS_STACK_REALIGN)add_definitions(-mstackrealign)endif()execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversionOUTPUT_VARIABLE GCC_VERSION)
endif()if(${CMAKE_BUILD_TYPE} MATCHES Release)set(CMAKE_C_VISIBILITY_PRESET hidden)set(CMAKE_CXX_VISIBILITY_PRESET hidden)
endif()# set c11
set(CMAKE_CXX_STANDARD 11)
# rtti may be expensive on Embedded Platform, obey Google C Style Guide
# add_definitions(-fno-rtti)
set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} -fno-rtti)# add PIC flag
add_definitions(-fPIC)
# set (CMAKE_SHARED_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS})# add_definitions(-fvisibilityhidden -fvisibility-inlines-hidden)
set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} -fvisibilityhidden -fvisibility-inlines-hidden)
include_directories(./)if(USE_RKAIQ)find_package(RkAiq REQUIRED)include_directories(${RKAIQ_INCLUDE_DIRS})add_definitions(-DRKAIQ)
endif()if(AUDIO_ALGORITHM)add_definitions(-DAUDIO_ALGORITHM_ENABLE)
endif()# ----------------------------------------------------------------------------
# Build options
# ----------------------------------------------------------------------------
find_package(PkgConfig)
include(GNUInstallDirs)# ----------------------------------------------------------------------------
# Set Warning as Error
# ----------------------------------------------------------------------------
option(WARNINGS_AS_ERRORS Stop compiles on first warning OFF)
if(WARNINGS_AS_ERRORS)if(GCC)add_definitions(-Werror)elseif(MSVC)add_definitions(/WX)endif()
endif(WARNINGS_AS_ERRORS)option(FILTER compile: filter ON)
option(ENCODER compile: encoder ON)
option(DECODER compile: decoder ON)
option(MUXER compile: muxer ON)
option(DEMUXER compile: demuxer ON)
option(RKNN compile: rknn wrapper OFF)
option(ROCKFACE compile: rockface wrapper OFF)
option(ROCKX compile: rockx wrapper OFF)option(SANITIZER_STATIC compile with sanitizer (static library linker) OFF)
if(SANITIZER_STATIC)add_definitions(-fsanitizeaddress -static-libasan -g -ggdb -gdwarf -funwind-tables -rdynamic -O0)add_definitions(-fno-stack-protector -fno-omit-frame-pointer -fsanitize-recoveraddress)# add_definitions(-fsanitizeundefined)link_libraries(libasan.a dl m rt)
endif()option(SANITIZER_DYNAMIC compile with sanitizer (dynamic library linker) OFF)
if(SANITIZER_DYNAMIC)# NOTE: copy libasan.so with manual operationadd_definitions(-fsanitizeaddress -g -ggdb -gdwarf -funwind-tables -rdynamic -O0)add_definitions(-fno-stack-protector -fno-omit-frame-pointer -fsanitize-recoveraddress)# add_definitions(-fsanitizeundefined)link_libraries(asan)
endif()pkg_check_modules(LIBDRM libdrm)
if(LIBDRM_FOUND)add_definitions(-DLIBDRM)include_directories(${LIBDRM_INCLUDE_DIRS})set(EASY_MEDIA_DEPENDENT_LIBS drm)
else()
pkg_check_modules(LIBION libion)
if(LIBION_FOUND)add_definitions(-DLIBION)include_directories(${LIBION_INCLUDE_DIRS})set(EASY_MEDIA_DEPENDENT_LIBS ion)
endif()
endif()option(RKMEDIA_SOCKET Enable rkmedia socket OFF)
if(RKMEDIA_SOCKET)
add_definitions(-DRKMEDIA_SOCKET)
endif()if (MINILOGGER)
find_package(MiniLogger REQUIRED)
set(EASY_MEDIA_DEPENDENT_LIBS${EASY_MEDIA_DEPENDENT_LIBS} MiniLogger::MiniLogger)
add_definitions(-DRKMEDIA_SUPPORT_MINILOG)
endif()option(TIMESTAMP_DEBUG Time-consuming statistics of each stage of MB OFF)
if (TIMESTAMP_DEBUG)add_definitions(-DRKMEDIA_TIMESTAMP_DEBUG)
endif()option(COMPILES_MINIMEDIA Enable compiles minimedia OFF)
include_directories(include/easymedia)
include_directories(include/rkmedia)
add_subdirectory(src)option(COMPILES_EXAMPLES Enable compiles examples OFF)
if(COMPILES_EXAMPLES)include(CTest)enable_testing()add_subdirectory(examples)
endif()option(COMPILES_UVC_EXAMPLE Enable compiles uvc example OFF)
