CMake的：C++ 11沒有設置與CXX_STANDARD

我想編譯使用C++ 11的庫。該圖書館是一個子項目。在其的CMakeLists.txt我設置C++ 11特徵與CXX_STANDARD和CXX_STANDARD_REQUIRED所見here。CMake的：C++ 11沒有設置與CXX_STANDARD

它沒有錯誤執行CMake的命令，但是當我開始編譯我得到關於C++ 11個功能缺失的錯誤，好像

In file included from /folder/OptionWidget.cpp:1:0: 
/folder/OptionWidget.h:14:28: warning: defaulted and deleted functions only available with -std=c++0x or -std=gnu++0x [enabled by default] 
/folder/OptionWidget.h:14:28: error: ‘virtual WTradeGui::OptionWidget::~OptionWidget()’ declared virtual cannot be defaulted in the class body 
make[2]: *** [.../OptionWidget.cpp.o] Error 1

的錯誤在於，我宣佈在頭一個默認的虛擬析構函數virtual ~OptionWidget() = default;

如果我執行命令make VERBOSE=1我可以看到，C++ 11標誌未被編譯在命令設置：

/usr/bin/c++ -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NO_DEBUG -DQT_WIDGETS_LIB -I/folder/wtradegui -I/folder/wtradegui -I/folder/wtrade/src -isystem /qt/include -isystem /qt/QtWidgets -isystem /qt/QtGui -isystem /qt/QtCore -isystem -fPIC -o CMakeFiles/wtradegui.dir/OptionWidget.cpp.o -c /folder/OptionWidget.cpp

我使用Ubuntu 15.04，cmake 3.3.1和gcc 4.6.3。

同樣的項目使用內置的MinGW沒有窗戶下的問題，（抱歉，我不記得的版本，它的一個附帶的Qt 5.5.0版本）。

我必須以建立在Linux上的項目做什麼呢？

這是主要的CMakeList.txt

# In order to work following variables must be set 
# 
# QT_DIR: Path to Qt installation. 

cmake_minimum_required (VERSION 3.1.0) 

# Variables that should be set before execution 
if (WIN32) 
    set (QT_DIR "" CACHE PATH "Qt library path") 
else (WIN32) 
    set (QT_DIR "/usr/include" CACHE PATH "Qt library path") 
endif (WIN32) 

message ("Generating WPlot project") 
message ("Setting QT_DIR To ${QT_DIR}") 

add_subdirectory (wplot) 
add_subdirectory (demo)

而這正是的CMakeLists.txt wplot文件夾內

# wPlot project 

cmake_minimum_required (VERSION 3.1.0) 

project (wplot) 

set (major_version 0) 
set (minor_version 0) 
set (bugfix_version 1) 
set (project_version ${major_version}.${minor_version}.${bugfix_version}) 
set (OUTPUT_DIR "build") 
set (CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/export/lib) 
set (CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/export/lib) 
set (CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/export/bin) 
set (INCLUDE_EXPORT_DIRECTORY ${CMAKE_BINARY_DIR}/export/include/wplot) 
set (CMAKE_DOC_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/export/doc) 
set (CMAKE_PREFIX_PATH ${QT_DIR}/lib/cmake) 
set (CMAKE_AUTOMOC ON) 
set (CMAKE_INCLUDE_CURRENT_DIR ON) 

message ("=== Generating WPlot ===") 
message ("Setting QT_DIR To ${QT_DIR}") 
message ("CMAKE_PREFIX_PATH set to ${CMAKE_PREFIX_PATH}") 
find_package (Qt5Widgets REQUIRED) 
include_directories (${CMAKE_SOURCE_DIR} ${Qt5Widgets_INCLUDE_DIRS}) 
file (GLOB_RECURSE WPLOT_SOURCES "*.cpp") 
file (GLOB WPLOT_PUBLIC_HEADERS "*.h") 
file (COPY ${WPLOT_PUBLIC_HEADERS} DESTINATION ${INCLUDE_EXPORT_DIRECTORY}) 

# Compile project 
add_definitions(-DWPLOT_LIBRARY) 
add_library (wplot SHARED ${WPLOT_SOURCES}) 
target_link_libraries(wplot ${Qt5Widgets_LIBRARIES}) 
set_target_properties(
    wplot 
    PROPERTIES 
    VERSION ${project_version} 
    SOVERSION ${project_version} 
) 
set_property(TARGET wplot PROPERTY CXX_STANDARD 11) 
set_property(TARGET wplot PROPERTY CXX_STANDARD_REQUIRED ON)

來源

2015-09-02 Jepessen

GCC支持C++ 11具有progressively grown since GCC 4.3 to GCC 4.9。

GCC 4.6正式支持的C++ 0x（之前它甚至有一個名字的C++ 11標準草案的名稱）的一個子集。 Qt 5.5附帶MinGW 4.9，它具有基本完整的C++ 11支持。

CMake不會考慮GCC 4.6支持C++ 11，但我不確定爲什麼CXX_STANDARD_REQUIRED = ON不會強制配置步驟失敗。無論如何，更好的方法是使用target_compile_features命令告訴CMake您需要哪些C++ 11功能，並讓它確定啓用這些功能所需的編譯器標誌。

來源

2015-09-03 21:42:45 nocnokneo

CMake的：C++ 11沒有設置與CXX_STANDARD

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