问题
This question already has an answer here:
- How do I check OS with a preprocessor directive? 16 answers
I want to run some c++ code on Linux and Windows. There are some pieces of code that I want to include only for one operating system and not the other. Is there a standard #ifdef that once can use?
Something like:
#ifdef LINUX_KEY_WORD
... // linux code goes here.
#elif WINDOWS_KEY_WORD
... // windows code goes here.
#else
#error \"OS not supported!\"
#endif
The question is indeed a duplicate but the answers here are much better, especially the accepted one.
回答1:
use:
#ifdef __linux__
//linux code goes here
#elif _WIN32
// windows code goes here
#else
#endif
回答2:
You can do
#if MACRO0
//code...
#elif MACRO1
//code...
#endif
Where Macro can be:
__linux__ Defined on Linux
__sun Defined on Solaris
__FreeBSD__ Defined on FreeBSD
__NetBSD__ Defined on NetBSD
__OpenBSD__ Defined on OpenBSD
__APPLE__ Defined on Mac OS X
__hpux Defined on HP-UX
__osf__ Defined on Tru64 UNIX (formerly DEC OSF1)
__sgi Defined on Irix
_AIX Defined on AIX
回答3:
I know it is not answer but added if someone looking same in Qt
In Qt
https://wiki.qt.io/Get-OS-name-in-Qt
QString Get::osName()
{
#if defined(Q_OS_ANDROID)
return QLatin1String("android");
#elif defined(Q_OS_BLACKBERRY)
return QLatin1String("blackberry");
#elif defined(Q_OS_IOS)
return QLatin1String("ios");
#elif defined(Q_OS_MAC)
return QLatin1String("osx");
#elif defined(Q_OS_WINCE)
return QLatin1String("wince");
#elif defined(Q_OS_WIN)
return QLatin1String("windows");
#elif defined(Q_OS_LINUX)
return QLatin1String("linux");
#elif defined(Q_OS_UNIX)
return QLatin1String("unix");
#else
return QLatin1String("unknown");
#endif
}
回答4:
It depends on the used compiler.
For example, Windows' definition can be WIN32
or _WIN32
.
And Linux' definition can be UNIX
or __unix__
or LINUX
or __linux__
.
回答5:
This response isn't about macro war, but producing error if no matching platform is found.
#ifdef LINUX_KEY_WORD
... // linux code goes here.
#elif WINDOWS_KEY_WORD
... // windows code goes here.
#else
#error Platform not supported
#endif
If #error
is not supported, you may use static_assert (C++0x) keyword. Or you may implement custom STATIC_ASSERT, or just declare an array of size 0, or have switch that has duplicate cases. In short, produce error at compile time and not at runtime
回答6:
It depends on the compiler. If you compile with, say, G++ on Linux and VC++ on Windows, this will do :
#ifdef linux
...
#elif _WIN32
...
#else
...
#endif
回答7:
No, these defines are compiler dependent. What you can do, use your own set of defines, and set them on the Makefile. See this thread for more info.
来源:https://stackoverflow.com/questions/6649936/c-compiling-on-windows-and-linux-ifdef-switch