如果使用QObject :: connect（）的lambda函数编译gcc失败
此代码编译没有任何问题Qt5.2.0 MSVC2012：
#include <QCoreApplication>
#include <QObject>
#include <QTimer>
#include <QDebug>
int main(int argc, char *argv[])
{
QTimer timer;
QCoreApplication a(argc, argv);
QObject::connect(&timer, &QTimer::timeout,
[=] () {
qDebug() << Q_FUNC_INFO;
});
timer.start(1000);
return a.exec();
}
但是，如果我尝试用gcc编译Qt5.2.0，我得到这个错误：
../_test_gccLambda/main.cpp：在函数'int main（int，char **）'中：../_test_gccLambda/main.cpp:14:5：warning：lambda表达式仅适用于-std = c ++ 11或-std = gnu ++ 11 [默认启用]}）; （QTimer ::）（QTimer :: QPrivateSignal），main（int，char *）无效。 ）:: __ lambda0）'}）; ^ ../_test_gccLambda/main.cpp:14:6：note：candidates are：包含在../../Qt5/5.2.0/gcc_64/include/QtCore/qcoreapplication.h:48:0的文件中，from ../../Qt5/5.2.0/gcc_64/include/QtCore/QCoreApplication:1，from ../_test_gccLambda/main.cpp:1：../../Qt5/5.2.0/gcc_64/include/ QtCore / qobject.h：198：36：note：static QMetaObject :: Connection QObject :: connect（const QObject *，const char *，const QObject *，const char *，Qt :: ConnectionType）static QMetaObject :: Connection connect（ const QObject * sender，const char * signal，^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:198:36：note：candidate expect 5 arguments，3 provided ../。 ./Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:201:36：note：static QMetaObject :: Connection QObject :: connect（const QObject *，const QMetaMethod＆，const QObject *，const QMetaMethod＆，Qt： ：ConnectionType）static QMetaObject :: Connection connect（const QObject * sender，const QMetaMethod＆signal，^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:201:36：note：candidate expected 5个理由 ts，3提供../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:479:32：note：QMetaObject :: Connection QObject :: connect（const QObject *，const char *，const char *，Qt :: ConnectionType）const inline QMetaObject :: Connection QObject :: connect（const QObject * asender，const char * asignal，^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject。 h：479：32：注意：没有将参数2从'void（QTimer ::）（QTimer :: QPrivateSignal）'转换为'const char'../../Qt5/5.2.0/gcc_64/include/ QtCore / qobject.h：215：43：note：template static QMetaObject :: Connection QObject :: connect（const typename QtPrivate :: FunctionPointer :: Object *，Func1，const typename QtPrivate :: FunctionPointer :: Object *，Func2，Qt :: ConnectionType）static inline QMetaObject :: Connection connect（const typename QtPrivate :: FunctionPointer :: Object * sender，Func1 signal，^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h： 215：43：note：template argument deduction / substitution failed：../_test_gccLambda/main.cpp:14:6：note：mismatched types'const typena 我QtPrivate :: FunctionPointer :: Object *'和'main（int，char **）:: __ lambda0'}）; ^从../../Qt5/5.2.0/gcc_64/include/QtCore/qcoreapplication.h:48:0包含的文件中，从../../Qt5/5.2.0/gcc_64/include/QtCore/ QCoreApplication：1，from ../_test_gccLambda/main.cpp:1：../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:247:13：note：template static typename QtPrivate :: QEnableIf <（（int）（QtPrivate :: FunctionPointer :: ArgumentCount）> = 0），QMetaObject :: Connection> :: Type QObject :: connect（const typename QtPrivate :: FunctionPointer :: Object *，Func1，Func2）connect const typename QtPrivate :: FunctionPointer :: Object * sender，Func1 signal，Func2 slot）^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:247:13：note：template argument deduction /替换失败：../_test_gccLambda/main.cpp：替换模板静态类型名称QtPrivate :: QEnableIf <（（int）（QtPrivate :: FunctionPointer :: ArgumentCount）> = 0），QMetaObject :: Connection> ::类型QObject :: connect（const typename QtPrivate :: FunctionPointer :: Object *，Func1，Func2）[with Func1 = void（QTimer ::）（QTimer :: QPrivateSignal）; Func2 = main（int，char *）:: __ lambda0]'：../_test_gccLambda/main.cpp:14:6：从这里需要../_test_gccLambda/main.cpp:14:6：error：template argument for'模板静态类型名称QtPrivate :: QEnableIf <（（int）（QtPrivate :: FunctionPointer :: ArgumentCount）> = 0），QMetaObject :: Connection> :: Type QObject :: connect（const typename QtPrivate :: FunctionPointer :: Object *， Func1，Func2）'使用本地类型'main（int，char **）:: __ lambda0'}）; ^ _/_test_gccLambda/main.cpp:14:6：错误：试图实例化模板静态类型名QtPrivate :: QEnableIf <（（int）（QtPrivate :: FunctionPointer :: ArgumentCount）> = 0），QMetaObject :: Connection > :: Type QObject :: connect（const typename QtPrivate :: FunctionPointer :: Object *，Func1，Func2）'从../../Qt5/5.2.0/gcc_64/include/QtCore/qcoreapplication.h包含的文件中：48：0，来自../../Qt5/5.2.0/gcc_64/include/QtCore/QCoreApplication:1，来自../_test_gccLambda/main.cpp:1：../../Qt5/5.2。 0 / gcc_64 / include / QtCore / qobject.h：256：13：note：template static typename QtPrivate :: QEnableIf <（（（int）（QtPrivate :: FunctionPointer :: ArgumentCount）> = 0）&&（！QtPrivate :: （const typename QtPrivate :: FunctionPointer :: Object *，Func1，const QObject *，Func2，Qt :: ConnectionType）connect（const typename QtPrivate :: QPlayterToMemberFunction）），QMetaObject :: Connection> :: Type QObject :: connect ：FunctionPointer :: Object * sender，Func1 signal，const QObject * context，Func2 slot，^ ../../Qt5/5.2.0/gcc_64/include/QtCo re / qobject.h：256：13：note：template argument deduction / substitution failed：../_test_gccLambda/main.cpp:14:6：note：can not convert'main（int，char **）:: __ lambda0 {} '（type'main（int，char **）:: __ lambda0'）来键入'const QObject *'}）; ^从../../Qt5/5.2.0/gcc_64/include/QtCore/qcoreapplication.h:48:0包含的文件中，从../../Qt5/5.2.0/gcc_64/include/QtCore/ QCoreApplication：1，from ../_test_gccLambda/main.cpp:1：../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:287:13：note：template static typename QtPrivate :: QEnableIf <（QtPrivate :: FunctionPointer :: ArgumentCount ==（-1）），QMetaObject :: Connection> :: Type QObject :: connect（const typename QtPrivate :: FunctionPointer :: Object *，Func1，Func2）connect（const typename QtPrivate :: FunctionPointer :: Object * sender，Func1 signal，Func2 slot）^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:287:13：note：template argument deduction / substitution失败：../_test_gccLambda/main.cpp：替换'模板静态类型名称QtPrivate :: QEnableIf <（QtPrivate :: FunctionPointer :: ArgumentCount ==（-1）），QMetaObject :: Connection> :: Type QObject ::连接（const typename QtPrivate :: FunctionPointer :: Object *，Func1，Func2）[with Func1 = void（QTimer ::）（QTimer :: QPrivateSignal）; Func2 = main（int，char *）:: __ lambda0]'：../_test_gccLambda/main.cpp:14:6：从这里需要../_test_gccLambda/main.cpp:14:6：error：template argument for' （QtPrivate :: FunctionPointer :: ArgumentCount ==（-1）），QMetaObject :: Connection> :: Type QObject :: connect（const typename QtPrivate :: FunctionPointer :: Object *，Func1， Func2）'使用本地类型'main（int，char **）:: __ lambda0'}）; ^ ../_test_gccLambda/main.cpp:14:6：错误：试图实例化'模板静态类型名QtPrivate :: QEnableIf <（QtPrivate :: FunctionPointer :: ArgumentCount ==（-1）），QMetaObject :: Connection>： ：类型QObject :: connect（const typename QtPrivate :: FunctionPointer :: Object *，Func1，Func2）'从../../Qt5/5.2.0/gcc_64/include/QtCore/qcoreapplication.h:48包含的文件中：0，来自../../Qt5/5.2.0/gcc_64/include/QtCore/QCoreApplication:1，来自../_test_gccLambda/main.cpp:1：../../Qt5/5.2.0/ gcc_64 / include / QtCore / qobject.h：295：13：note：template static typename QtPrivate :: QEnableIf <（QtPrivate :: FunctionPointer :: ArgumentCount ==（-1）），QMetaObject :: Connection> :: Type QObject： ：const（const typename QtPrivate :: FunctionPointer :: Object *，Func1，const QObject *，Func2，Qt :: ConnectionType）connect（const typename QtPrivate :: FunctionPointer :: Object * sender，Func1 signal，const QObject * context，Func2插槽，^ ../../Qt5/5.2.0/gcc_64/include/QtCore/qobject.h:295:13：note：template argument deduction / substitution fai led：../_test_gccLambda/main.cpp:14:6：note：无法转换'main（int，char **）:: __ lambda0 {}'（type'main（int，char **）:: __ lambda0'）键入'const QObject *'}）; ^ make：* [main.o]错误1 16:53:24：使用代码2退出进程“/ usr / bin / make”。构建/部署项目时出错_test_gccLambda（套件：Desktop Qt 5.2.0 GCC 64bit）执行步骤'Make'16:53:24时：已用时间：00:02。
哪里有问题？
如注释中所回答的那样，使用-std = c ++ 11让它使用gcc进行编译
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