C++ 在 Qt 中添加额外的编译器选项
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Adding extra compiler option in Qt
提问by smallB
Where in Qt can I specify additional compiler options? Like for example -std=c++0x?
我可以在 Qt 中的哪里指定额外的编译器选项？例如 -std=c++0x?
回答by Dotti
You can try adding
您可以尝试添加
QMAKE_CXXFLAGS += -std=c++0x
to your .pro file.
到您的 .pro 文件。
However, this should not be used in Qt 5 for enabling specific c++ standard. Instead, c++11or c++14in CONFIGvariable to do that. It will enable GNU extensions (-std=gnu++11), but if that is unwanted, also add strict_c++if you want to disable those. For example, this should pass -std=c++11to the compiler:
但是，这不应在 Qt 5 中用于启用特定的 c++ 标准。相反，c++11或c++14在CONFIG变量中做到这一点。它将启用 GNU 扩展 (-std=gnu++11)，但如果不需要，还可以添加strict_c++是否要禁用它们。例如，这应该传递-std=c++11给编译器：
CONFIG += c++11 strict_c++
回答by Vinicius Kamakura
In your .pro file, you could add:
在您的 .pro 文件中，您可以添加：
QMAKE_CXXFLAGS += -std=c++0x
I think every variable in the spec's qmake.confcan be altered like that.
我认为规范中的每个变量qmake.conf都可以这样更改。
For example, the win32-g++ spec has, among other variables, these:
例如，win32-g++ 规范除了其他变量外，还有以下这些：
QMAKE_CC = gcc
QMAKE_LEX = flex
QMAKE_LEXFLAGS =
QMAKE_YACC = byacc
QMAKE_YACCFLAGS = -d
QMAKE_CFLAGS =
QMAKE_CFLAGS_DEPS = -M
QMAKE_CFLAGS_WARN_ON = -Wall
QMAKE_CFLAGS_WARN_OFF = -w
QMAKE_CFLAGS_RELEASE = -O2
QMAKE_CFLAGS_DEBUG = -g
QMAKE_CFLAGS_YACC = -Wno-unused -Wno-parentheses
QMAKE_CXX = g++
QMAKE_CXXFLAGS = $$QMAKE_CFLAGS
QMAKE_CXXFLAGS_DEPS = $$QMAKE_CFLAGS_DEPS
QMAKE_CXXFLAGS_WARN_ON = $$QMAKE_CFLAGS_WARN_ON
QMAKE_CXXFLAGS_WARN_OFF = $$QMAKE_CFLAGS_WARN_OFF
QMAKE_CXXFLAGS_RELEASE = $$QMAKE_CFLAGS_RELEASE
QMAKE_CXXFLAGS_DEBUG = $$QMAKE_CFLAGS_DEBUG
QMAKE_CXXFLAGS_YACC = $$QMAKE_CFLAGS_YACC
QMAKE_CXXFLAGS_THREAD = $$QMAKE_CFLAGS_THREAD
QMAKE_CXXFLAGS_RTTI_ON = -frtti
QMAKE_CXXFLAGS_RTTI_OFF = -fno-rtti
QMAKE_CXXFLAGS_EXCEPTIONS_ON = -fexceptions -mthreads
QMAKE_CXXFLAGS_EXCEPTIONS_OFF = -fno-exceptions
回答by kmdent
The way QT deals with compiler options is through the .pro file. It is a double edged sword if I may. It creates a nice abstraction, especially when compiling large projects. The problem is that you have to either look up or memorize how to add the flag. In the case of C++0X, you have to add the following flag to your .pro file:
QT 处理编译器选项的方式是通过 .pro 文件。如果可以的话，这是一把双刃剑。它创建了一个很好的抽象，尤其是在编译大型项目时。问题是您必须查找或记住如何添加标志。对于 C++0X，您必须在 .pro 文件中添加以下标志：
QMAKE_CXXFLAGS += -std=c++0x
Fortunately most of the flags that you need are automatically added if you use QtCreator.
幸运的是，如果您使用 QtCreator，您需要的大部分标志都会自动添加。
