宏定义： 各个平台+编译器
关于VS中区分debug与release，32位与64位编译的宏定义
1.判断是debug编译还是release编译。
如果_DEBUG定义了表示是debug编译，否则是release编译。
2.判断是32位编译还是64位编译。
在 Win32 配置下，_WIN32 有定义，_WIN64 没有定义。在 x64 配置下，两者都有定义。即在 VC 下，_WIN32 一定有定义。
因此，WIN32/_WIN32 可以用来判断是否 Windows 系统（对于跨平台程序），而 _WIN64 用来判断编译环境是 x86 还是 x64。附一个表：
常量\定义 预定义选项 Windows.h VC编译器
WIN32 Win32 √(minwindef.h) ×
_WIN32 × × √
_WIN64 × × x64
ifdef _DEBUG
#ifndef _WIN64
#pragma comment(lib,"json/json_mtd_x86.lib")
#else
#pragma comment(lib,"json/json_mtd_x64.lib")
#endif
#else
#ifndef _WIN64
#pragma comment(lib,"json/json_mt_x86.lib")
#else
#pragma comment(lib,"json/json_mt_x64.lib")
#endif
#endif
https://blog.csdn.net/zhuyingqingfen/article/details/24352137
编译选项
_MSC_FULL_VER//编译器所有的版本信息
MSVC++ 14.0: _MSC_VER = 1900 (Visual Studio 2015)
MSVC++ 12.0: _MSC_VER = 1800 (Visual Studio 2013)
MSVC++ 11.0: _MSC_VER = 1700 (Visual Studio 2012)
MSVC++ 10.0: _MSC_VER = 1600 (Visual Studio 2010)
MSVC++ 9.0: _MSC_VER = 1500 (Visual Studio 2008)
MSVC++ 8.0: _MSC_VER = 1400 (Visual Studio 2005)
MSVC++ 7.1: _MSC_VER = 1310 (Visual Studio 2003)
MSVC++ 7.0: _MSC_VER = 1300 (Visual Studio 2002)
MSVC++ 6.0: _MSC_VER = 1200
MSVC++ 5.0: _MSC_VER = 1100
/* Test for GCC > 3.2.0 */
#if __GNUC__ > 3 || \
(__GNUC__ == 3 && (__GNUC_MINOR__ > 2 || \
(__GNUC_MINOR__ == 2 && \
__GNUC_PATCHLEVEL__ > 0))
Another approach is to use the predefined macros to calculate a single number, then compare that against a threshold:
#define GCC_VERSION (__GNUC__ * 10000 \
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)
...
/* Test for GCC > 3.2.0 */
#if GCC_VERSION > 30200
操作系统判定：
Windows : WIN32 _WIN64
Linux : linux
Solaris : __sun
编译器判定：
VC : _MSC_VER
GCC / G++ : __GNUC__
SunCC : __SUNPRO_C和__SUNPRO_CC
llvm: __llvm__
#ifdef WIN32
//#include <WinBase.h>// WinBase.h(include Windows.h) GetLastError()
#endif
#ifdef linux//记得要是小写
#endif
#ifdef MACX
#endif
//MACX - Mac OS X
//MAC9 - Mac OS 9
从qglobal.h中可以得到的信息-我们应该多研究优秀软件的源码
MACX - Mac OS X
MAC9 - Mac OS 9
MSDOS - MS-DOS and Windows
OS2 - OS/2
OS2EMX - XFree86 on OS/2 (not PM)
WIN32 - Win32 (Windows 95/98/ME and Windows NT/2000/XP)
CYGWIN - Cygwin
SOLARIS - Sun Solaris
HPUX - HP-UX
ULTRIX - DEC Ultrix
LINUX - Linux
FREEBSD - FreeBSD
NETBSD - NetBSD
OPENBSD - OpenBSD
BSDI - BSD/OS
IRIX - SGI Irix
OSF - HP Tru64 UNIX
SCO - SCO OpenServer 5
UNIXWARE - UnixWare 7, Open UNIX 8
AIX - AIX
HURD - GNU Hurd
DGUX - DG/UX
RELIANT - Reliant UNIX
DYNIX - DYNIX/ptx
QNX - QNX
QNX6 - QNX RTP 6.1
LYNX - LynxOS
BSD4 - Any BSD 4.4 system
UNIX - Any UNIX BSD/SYSV system
c/c++ 宏
http://os.chinaunix.net/a2008/1216/989/000000989777.shtml
详见Qt的qglobal.h
/*
The operating system, must be one of: (Q_OS_x)
DARWIN - Darwin OS (synonym for Q_OS_MAC)
SYMBIAN - Symbian
MSDOS - MS-DOS and Windows
OS2 - OS/2
OS2EMX - XFree86 on OS/2 (not PM)
WIN32 - Win32 (Windows 2000/XP/Vista/7 and Windows Server 2003/2008)
WINCE - WinCE (Windows CE 5.0)
CYGWIN - Cygwin
SOLARIS - Sun Solaris
HPUX - HP-UX
ULTRIX - DEC Ultrix
LINUX - Linux
FREEBSD - FreeBSD
NETBSD - NetBSD
OPENBSD - OpenBSD
BSDI - BSD/OS
IRIX - SGI Irix
OSF - HP Tru64 UNIX
SCO - SCO OpenServer 5
UNIXWARE - UnixWare 7, Open UNIX 8
AIX - AIX
HURD - GNU Hurd
DGUX - DG/UX
RELIANT - Reliant UNIX
DYNIX - DYNIX/ptx
QNX - QNX
LYNX - LynxOS
BSD4 - Any BSD 4.4 system
UNIX - Any UNIX BSD/SYSV system
*/
#if defined(__APPLE__) && (defined(__GNUC__) || defined(__xlC__) || defined(__xlc__))
# define Q_OS_DARWIN
# define Q_OS_BSD4
# ifdef __LP64__
# define Q_OS_DARWIN64
# else
# define Q_OS_DARWIN32
# endif
#elif defined(__SYMBIAN32__) || defined(SYMBIAN)
# define Q_OS_SYMBIAN
# define Q_NO_POSIX_SIGNALS
# define QT_NO_GETIFADDRS
#elif defined(__CYGWIN__)
# define Q_OS_CYGWIN
#elif defined(MSDOS) || defined(_MSDOS)
# define Q_OS_MSDOS
#elif defined(__OS2__)
# if defined(__EMX__)
# define Q_OS_OS2EMX
# else
# define Q_OS_OS2
# endif
#elif !defined(SAG_COM) && (defined(WIN64) || defined(_WIN64) || defined(__WIN64__))
# define Q_OS_WIN32
# define Q_OS_WIN64
#elif !defined(SAG_COM) && (defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__))
# if defined(WINCE) || defined(_WIN32_WCE)
# define Q_OS_WINCE
# else
# define Q_OS_WIN32
# endif
#elif defined(__MWERKS__) && defined(__INTEL__)
# define Q_OS_WIN32
#elif defined(__sun) || defined(sun)
# define Q_OS_SOLARIS
#elif defined(hpux) || defined(__hpux)
# define Q_OS_HPUX
#elif defined(__ultrix) || defined(ultrix)
# define Q_OS_ULTRIX
#elif defined(sinix)
# define Q_OS_RELIANT
#elif defined(__native_client__)
# define Q_OS_NACL
#elif defined(__linux__) || defined(__linux)
# define Q_OS_LINUX
#elif defined(__FreeBSD__) || defined(__DragonFly__)
# define Q_OS_FREEBSD
# define Q_OS_BSD4
#elif defined(__NetBSD__)
# define Q_OS_NETBSD
# define Q_OS_BSD4
#elif defined(__OpenBSD__)
# define Q_OS_OPENBSD
# define Q_OS_BSD4
#elif defined(__bsdi__)
# define Q_OS_BSDI
# define Q_OS_BSD4
#elif defined(__sgi)
# define Q_OS_IRIX
#elif defined(__osf__)
# define Q_OS_OSF
#elif defined(_AIX)
# define Q_OS_AIX
#elif defined(__Lynx__)
# define Q_OS_LYNX
#elif defined(__GNU__)
# define Q_OS_HURD
#elif defined(__DGUX__)
# define Q_OS_DGUX
#elif defined(__QNXNTO__)
# define Q_OS_QNX
#elif defined(_SEQUENT_)
# define Q_OS_DYNIX
#elif defined(_SCO_DS) /* SCO OpenServer 5 + GCC */
# define Q_OS_SCO
#elif defined(__USLC__) /* all SCO platforms + UDK or OUDK */
# define Q_OS_UNIXWARE
#elif defined(__svr4__) && defined(i386) /* Open UNIX 8 + GCC */
# define Q_OS_UNIXWARE
#elif defined(__INTEGRITY)
# define Q_OS_INTEGRITY
#elif defined(VXWORKS) /* there is no "real" VxWorks define - this has to be set in the mkspec! */
# define Q_OS_VXWORKS
#elif defined(__MAKEDEPEND__)
#else
# error "Qt has not been ported to this OS - talk to qt-bugs@trolltech.com"
#endif
#if defined(Q_OS_WIN32) || defined(Q_OS_WIN64) || defined(Q_OS_WINCE)
# define Q_OS_WIN
#endif
#if defined(Q_OS_DARWIN)
# define Q_OS_MAC /* Q_OS_MAC is mostly for compatibility, but also more clear */
# define Q_OS_MACX /* Q_OS_MACX is only for compatibility.*/
# if defined(Q_OS_DARWIN64)
# define Q_OS_MAC64
# elif defined(Q_OS_DARWIN32)
# define Q_OS_MAC32
# endif
#endif
