【QT】Qt Compiler Detection（编译）

1、Compiler&GNU

Qt是跨平台的，从下面的编译配置选项（宏）中可以看出Qt支持的编译环境。

// qcompilerdetection.h/*   The compiler, must be one of: (Q_CC_x)     SYM      - Digital Mars C/C++ (used to be Symantec C++)     MSVC     - Microsoft Visual C/C++, Intel C++ for Windows     BOR      - Borland/Turbo C++     WAT      - Watcom C++     GNU      - GNU C++     COMEAU   - Comeau C++     EDG      - Edison Design Group C++     OC       - CenterLine C++     SUN      - Forte Developer, or Sun Studio C++     MIPS     - MIPSpro C++     DEC      - DEC C++     HPACC    - HP aC++     USLC     - SCO OUDK and UDK     CDS      - Reliant C++     KAI      - KAI C++     INTEL    - Intel C++ for Linux, Intel C++ for Windows     HIGHC    - MetaWare High C/C++     PGI      - Portland Group C++     GHS      - Green Hills Optimizing C++ Compilers     RVCT     - ARM Realview Compiler Suite     CLANG    - C++ front-end for the LLVM compiler   Should be sorted most to least authoritative.*/

或者如下所示的Qt支持的OS。

// qsystemdetection.h    /*   The operating system, must be one of: (Q_OS_x)     DARWIN   - Any Darwin system (macOS, iOS, watchOS, tvOS)     MACOS    - macOS     IOS      - iOS     WATCHOS  - watchOS     TVOS     - tvOS     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)     WINRT    - WinRT (Windows 8 Runtime)     CYGWIN   - Cygwin     SOLARIS  - Sun Solaris     HPUX     - HP-UX     ULTRIX   - DEC Ultrix     LINUX    - Linux [has variants]     FREEBSD  - FreeBSD [has variants]     NETBSD   - NetBSD     OPENBSD  - OpenBSD     BSDI     - BSD/OS     INTERIX  - Interix     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 [has variants]     QNX6     - QNX RTP 6.1     LYNX     - LynxOS     BSD4     - Any BSD 4.4 system     UNIX     - Any UNIX BSD/SYSV system     ANDROID  - Android platform     HAIKU    - Haiku   The following operating systems have variants:     LINUX    - both Q_OS_LINUX and Q_OS_ANDROID are defined when building for Android              - only Q_OS_LINUX is defined if building for other Linux systems     FREEBSD  - Q_OS_FREEBSD is defined only when building for FreeBSD with a BSD userland              - Q_OS_FREEBSD_KERNEL is always defined on FreeBSD, even if the userland is from GNU*/

以GNU为例，我们来看看Qt通过gcc的特性定义了那些东西，如常见的__attribute__。

// qcompilerdetection.h// ... other compilers#elif defined(__GNUC__)#  define Q_CC_GNU          (__GNUC__ * 100 + __GNUC_MINOR__) // gnu#  if defined(__MINGW32__)#    define Q_CC_MINGW // mingw#  endif#  if defined(__INTEL_COMPILER)#    define Q_CC_INTEL      (__INTEL_COMPILER) // intel// ... intel compiler#  else/* Plain GCC */#    if Q_CC_GNU >= 405 // version#      define Q_ASSUME_IMPL(expr)  if (expr){} else __builtin_unreachable()#      define Q_UNREACHABLE_IMPL() __builtin_unreachable()#      define Q_DECL_DEPRECATED_X(text) __attribute__ ((__deprecated__(text)))#    endif#  endif#  ifdef Q_OS_WIN // win#    define Q_DECL_EXPORT     __declspec(dllexport)#    define Q_DECL_IMPORT     __declspec(dllimport)#  elif defined(QT_VISIBILITY_AVAILABLE) // linux#    define Q_DECL_EXPORT     __attribute__((visibility("default")))#    define Q_DECL_IMPORT     __attribute__((visibility("default")))#    define Q_DECL_HIDDEN     __attribute__((visibility("hidden")))#  endif#  define Q_FUNC_INFO       __PRETTY_FUNCTION__#  define Q_ALIGNOF(type)   __alignof__(type)#  define Q_TYPEOF(expr)    __typeof__(expr)#  define Q_DECL_DEPRECATED __attribute__ ((__deprecated__))#  define Q_DECL_ALIGN(n)   __attribute__((__aligned__(n)))#  define Q_DECL_UNUSED     __attribute__((__unused__))#  define Q_LIKELY(expr)    __builtin_expect(!!(expr), true)#  define Q_UNLIKELY(expr)  __builtin_expect(!!(expr), false)#  define Q_NORETURN        __attribute__((__noreturn__))#  define Q_REQUIRED_RESULT __attribute__ ((__warn_unused_result__))#  define Q_DECL_PURE_FUNCTION __attribute__((pure))#  define Q_DECL_CONST_FUNCTION __attribute__((const))#  if !defined(QT_MOC_CPP) // no moc#    define Q_PACKED __attribute__ ((__packed__))#    ifndef __ARM_EABI__ // no arm eabi#      define QT_NO_ARM_EABI#    endif#  endif#  if Q_CC_GNU >= 403 && !defined(Q_CC_CLANG) // version && non-clang#      define Q_ALLOC_SIZE(x) __attribute__((alloc_size(x)))#  endif

2、C++11&GNU

下面是gcc各版本对C++11的支持所涉及的宏。

// qcompilerdetection.h#if defined(Q_CC_GNU) && !defined(Q_CC_INTEL) && !defined(Q_CC_CLANG)#  define Q_COMPILER_RESTRICTED_VLA#  define Q_COMPILER_THREADSAFE_STATICS#  if Q_CC_GNU >= 403//   GCC supports binary literals in C, C++98 and C++11 modes#    define Q_COMPILER_BINARY_LITERALS#  endif#  if !defined(__STRICT_ANSI__) || defined(__GXX_EXPERIMENTAL_CXX0X__) \    || (defined(__cplusplus) && (__cplusplus >= 201103L)) \    || (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L))     // Variadic macros are supported for gnu++98, c++11, C99 ... since forever (gcc 2.97)#    define Q_COMPILER_VARIADIC_MACROS#  endif#  if defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L#    if Q_CC_GNU >= 403       /* C++11 features supported in GCC 4.3: */#      define Q_COMPILER_DECLTYPE#      define Q_COMPILER_RVALUE_REFS#      define Q_COMPILER_STATIC_ASSERT#    endif#    if Q_CC_GNU >= 404       /* C++11 features supported in GCC 4.4: */#      define Q_COMPILER_AUTO_FUNCTION#      define Q_COMPILER_AUTO_TYPE#      define Q_COMPILER_EXTERN_TEMPLATES#      define Q_COMPILER_UNIFORM_INIT#      define Q_COMPILER_UNICODE_STRINGS#      define Q_COMPILER_VARIADIC_TEMPLATES#    endif#    if Q_CC_GNU >= 405       /* C++11 features supported in GCC 4.5: */#      define Q_COMPILER_EXPLICIT_CONVERSIONS       /* GCC 4.4 implements initializer_list but does not define typedefs required        * by the standard. */#      define Q_COMPILER_INITIALIZER_LISTS#      define Q_COMPILER_LAMBDA#      define Q_COMPILER_RAW_STRINGS#      define Q_COMPILER_CLASS_ENUM#    endif#    if Q_CC_GNU >= 406       /* Pre-4.6 compilers implement a non-final snapshot of N2346, hence default and delete        * functions are supported only if they are public. Starting from 4.6, GCC handles        * final version - the access modifier is not relevant. */#      define Q_COMPILER_DEFAULT_MEMBERS#      define Q_COMPILER_DELETE_MEMBERS       /* C++11 features supported in GCC 4.6: */#      define Q_COMPILER_CONSTEXPR#      define Q_COMPILER_NULLPTR#      define Q_COMPILER_UNRESTRICTED_UNIONS#      define Q_COMPILER_RANGE_FOR#    endif#    if Q_CC_GNU >= 407       /* GCC 4.4 implemented <atomic> and std::atomic using its old intrinsics.        * However, the implementation is incomplete for most platforms until GCC 4.7:        * instead, std::atomic would use an external lock. Since we need an std::atomic        * that is behavior-compatible with QBasicAtomic, we only enable it here */#      define Q_COMPILER_ATOMICS       /* GCC 4.6.x has problems dealing with noexcept expressions,        * so turn the feature on for 4.7 and above, only */#      define Q_COMPILER_NOEXCEPT       /* C++11 features supported in GCC 4.7: */#      define Q_COMPILER_NONSTATIC_MEMBER_INIT#      define Q_COMPILER_DELEGATING_CONSTRUCTORS#      define Q_COMPILER_EXPLICIT_OVERRIDES#      define Q_COMPILER_TEMPLATE_ALIAS#      define Q_COMPILER_UDL#    endif#    if Q_CC_GNU >= 408#      define Q_COMPILER_ATTRIBUTES#      define Q_COMPILER_ALIGNAS#      define Q_COMPILER_ALIGNOF#      define Q_COMPILER_INHERITING_CONSTRUCTORS#      define Q_COMPILER_THREAD_LOCAL#      if Q_CC_GNU > 408 || __GNUC_PATCHLEVEL__ >= 1#         define Q_COMPILER_REF_QUALIFIERS#      endif#    endif     /* C++11 features are complete as of GCC 4.8.1 */#  endif#  if __cplusplus > 201103L#    if Q_CC_GNU >= 409     /* C++1y features in GCC 4.9 - deprecated, do not update this list *///#    define Q_COMPILER_BINARY_LITERALS   // already supported since GCC 4.3 as an extension#      define Q_COMPILER_LAMBDA_CAPTURES#      define Q_COMPILER_RETURN_TYPE_DEDUCTION#    endif#  endif#endif

3、C++11 keywords

下面是与C++11各关键字相关的宏，如常见的= default、= delete。

// qcompilerdetection.h/* * C++11 keywords and expressions */#ifdef Q_COMPILER_NULLPTR# define Q_NULLPTR         nullptr#else# define Q_NULLPTR         NULL#endif#ifdef Q_COMPILER_DEFAULT_MEMBERS#  define Q_DECL_EQ_DEFAULT = default#else#  define Q_DECL_EQ_DEFAULT#endif#ifdef Q_COMPILER_DELETE_MEMBERS# define Q_DECL_EQ_DELETE = delete#else# define Q_DECL_EQ_DELETE#endif// Don't break code that is already using Q_COMPILER_DEFAULT_DELETE_MEMBERS#if defined(Q_COMPILER_DEFAULT_MEMBERS) && defined(Q_COMPILER_DELETE_MEMBERS)#  define Q_COMPILER_DEFAULT_DELETE_MEMBERS#endif#if defined Q_COMPILER_CONSTEXPR# if defined(__cpp_constexpr) && __cpp_constexpr-0 >= 201304#  define Q_DECL_CONSTEXPR constexpr#  define Q_DECL_RELAXED_CONSTEXPR constexpr#  define Q_CONSTEXPR constexpr#  define Q_RELAXED_CONSTEXPR constexpr# else#  define Q_DECL_CONSTEXPR constexpr#  define Q_DECL_RELAXED_CONSTEXPR#  define Q_CONSTEXPR constexpr#  define Q_RELAXED_CONSTEXPR const# endif#else# define Q_DECL_CONSTEXPR# define Q_DECL_RELAXED_CONSTEXPR# define Q_CONSTEXPR const# define Q_RELAXED_CONSTEXPR const#endif#ifdef Q_COMPILER_EXPLICIT_OVERRIDES# define Q_DECL_OVERRIDE override# define Q_DECL_FINAL final#else# ifndef Q_DECL_OVERRIDE#  define Q_DECL_OVERRIDE# endif# ifndef Q_DECL_FINAL#  define Q_DECL_FINAL# endif#endif#ifdef Q_COMPILER_NOEXCEPT# define Q_DECL_NOEXCEPT noexcept# define Q_DECL_NOEXCEPT_EXPR(x) noexcept(x)# ifdef Q_DECL_NOTHROW#  undef Q_DECL_NOTHROW /* override with C++11 noexcept if available */# endif#else# define Q_DECL_NOEXCEPT# define Q_DECL_NOEXCEPT_EXPR(x)#endif#ifndef Q_DECL_NOTHROW# define Q_DECL_NOTHROW Q_DECL_NOEXCEPT#endif#if defined(Q_COMPILER_ALIGNOF)#  undef Q_ALIGNOF#  define Q_ALIGNOF(x)  alignof(x)#endif#if defined(Q_COMPILER_ALIGNAS)#  undef Q_DECL_ALIGN#  define Q_DECL_ALIGN(n)   alignas(n)#endif

4、C++ standard

C++标准参考：https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations
下面是sg10-sd6给出的一些C++特性。

// qcompilerdetection.h#ifdef __has_builtin#  define QT_HAS_BUILTIN(x)             __has_builtin(x)#else#  define QT_HAS_BUILTIN(x)             0#endif#ifdef __has_attribute#  define QT_HAS_ATTRIBUTE(x)           __has_attribute(x)#else#  define QT_HAS_ATTRIBUTE(x)           0#endif#ifdef __has_cpp_attribute#  define QT_HAS_CPP_ATTRIBUTE(x)       __has_cpp_attribute(x)#else#  define QT_HAS_CPP_ATTRIBUTE(x)       0#endif#ifdef __has_include#  define QT_HAS_INCLUDE(x)             __has_include(x)#else#  define QT_HAS_INCLUDE(x)             0#endif#ifdef __has_include_next#  define QT_HAS_INCLUDE_NEXT(x)        __has_include_next(x)#else#  define QT_HAS_INCLUDE_NEXT(x)        0#endif

5、Warning handling

在编译代码时，常会看到一些Warning，这些Warning可以通过技术手段规避，如下的一些宏定义，将会产生警告的代码置于push与pop之间，或者直接disable或ignored会产生警告的编译规则。

// qcompilerdetection.h#define QT_DO_PRAGMA(text)                      _Pragma(#text)// ... other compilers#elif defined(Q_CC_MSVC) && _MSC_VER >= 1500 && !defined(Q_CC_CLANG)#  undef QT_DO_PRAGMA                           /* not needed */#  define QT_WARNING_PUSH                       __pragma(warning(push))#  define QT_WARNING_POP                        __pragma(warning(pop))#  define QT_WARNING_DISABLE_MSVC(number)       __pragma(warning(disable: number))#  define QT_WARNING_DISABLE_INTEL(number)#  define QT_WARNING_DISABLE_CLANG(text)#  define QT_WARNING_DISABLE_GCC(text)#  define QT_WARNING_DISABLE_DEPRECATED         QT_WARNING_DISABLE_MSVC(4996)#elif defined(Q_CC_GNU) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 406)#  define QT_WARNING_PUSH                       QT_DO_PRAGMA(GCC diagnostic push)#  define QT_WARNING_POP                        QT_DO_PRAGMA(GCC diagnostic pop)#  define QT_WARNING_DISABLE_GCC(text)          QT_DO_PRAGMA(GCC diagnostic ignored text)#  define QT_WARNING_DISABLE_CLANG(text)#  define QT_WARNING_DISABLE_INTEL(number)#  define QT_WARNING_DISABLE_MSVC(number)#  define QT_WARNING_DISABLE_DEPRECATED         QT_WARNING_DISABLE_GCC("-Wdeprecated-declarations")#else       // All other compilers, GCC < 4.6 and MSVC < 2008#  define QT_WARNING_DISABLE_GCC(text)#  define QT_WARNING_PUSH#  define QT_WARNING_POP#  define QT_WARNING_DISABLE_INTEL(number)#  define QT_WARNING_DISABLE_MSVC(number)#  define QT_WARNING_DISABLE_CLANG(text)#  define QT_WARNING_DISABLE_GCC(text)#  define QT_WARNING_DISABLE_DEPRECATED#endif

6、arch processor

下面是Qt支持的处理器类型（ARCH_PROCESSOR），如常见的i386、x86_64等。

// archdetect.cpp// main part: processor type#if defined(Q_PROCESSOR_ALPHA)#  define ARCH_PROCESSOR "alpha"#elif defined(Q_PROCESSOR_ARM_32)#  define ARCH_PROCESSOR "arm"#elif defined(Q_PROCESSOR_ARM_64)#  define ARCH_PROCESSOR "arm64"#elif defined(Q_PROCESSOR_AVR32)#  define ARCH_PROCESSOR "avr32"#elif defined(Q_PROCESSOR_BLACKFIN)#  define ARCH_PROCESSOR "bfin"#elif defined(Q_PROCESSOR_X86_32)#  define ARCH_PROCESSOR "i386"#elif defined(Q_PROCESSOR_X86_64)#  define ARCH_PROCESSOR "x86_64"#elif defined(Q_PROCESSOR_IA64)#  define ARCH_PROCESSOR "ia64"#elif defined(Q_PROCESSOR_MIPS_64)#  define ARCH_PROCESSOR "mips64"#elif defined(Q_PROCESSOR_MIPS)#  define ARCH_PROCESSOR "mips"#elif defined(Q_PROCESSOR_POWER_32)#  define ARCH_PROCESSOR "power"#elif defined(Q_PROCESSOR_POWER_64)#  define ARCH_PROCESSOR "power64"#elif defined(Q_PROCESSOR_S390_X)#  define ARCH_PROCESSOR "s390x"#elif defined(Q_PROCESSOR_S390)#  define ARCH_PROCESSOR "s390"#elif defined(Q_PROCESSOR_SH)#  define ARCH_PROCESSOR "sh"#elif defined(Q_PROCESSORS_SPARC_64)#  define ARCH_PROCESSOR "sparc64"#elif defined(Q_PROCESSOR_SPARC_V9)#  define ARCH_PROCESSOR "sparcv9"#elif defined(Q_PROCESSOR_SPARC)#  define ARCH_PROCESSOR "sparc"#else#  define ARCH_PROCESSOR "unknown"#endif

处理器对应的宏有固定的格式，如下所示。

// qprocessordetection.h        Q_PROCESSOR_{FAMILY}    Q_PROCESSOR_{FAMILY}_{VARIANT}    Q_PROCESSOR_{FAMILY}_{REVISION}// qprocessordetection.h    // ... other arches/*ARM family, known revisions: V5, V6, V7, V8ARM is bi-endian, detect using __ARMEL__ or __ARMEB__X86 family, known variants: 32- and 64-bitX86 is little-endian/*#elif defined(__i386) || defined(__i386__) || defined(_M_IX86)#  define Q_PROCESSOR_X86_32#  define Q_BYTE_ORDER Q_LITTLE_ENDIAN#  define Q_PROCESSOR_WORDSIZE   4#  if defined(_M_IX86)#    define Q_PROCESSOR_X86     (_M_IX86/100)#  elif defined(__i686__) || defined(__athlon__) || defined(__SSE__) || defined(__pentiumpro__)#    define Q_PROCESSOR_X86     6#  elif defined(__i586__) || defined(__k6__) || defined(__pentium__)#    define Q_PROCESSOR_X86     5#  elif defined(__i486__) || defined(__80486__)#    define Q_PROCESSOR_X86     4#  else#    define Q_PROCESSOR_X86     3#  endif#elif defined(__x86_64) || defined(__x86_64__) || defined(__amd64) || defined(_M_X64)#  define Q_PROCESSOR_X86       6#  define Q_PROCESSOR_X86_64#  define Q_BYTE_ORDER Q_LITTLE_ENDIAN#  define Q_PROCESSOR_WORDSIZE   8// ... other arches

7、arch endian

大小端字节序（ARCH_ENDIANNESS）定义如下所示。

// archdetect.cpp// endianness#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN#  define ARCH_ENDIANNESS "little_endian"#elif Q_BYTE_ORDER == Q_BIG_ENDIAN#  define ARCH_ENDIANNESS "big_endian"#endif// qprocessordetection.h    /* Machine byte-order, reuse preprocessor provided macros when available */#if defined(__ORDER_BIG_ENDIAN__)#  define Q_BIG_ENDIAN __ORDER_BIG_ENDIAN__#else#  define Q_BIG_ENDIAN 4321#endif#if defined(__ORDER_LITTLE_ENDIAN__)#  define Q_LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__#else#  define Q_LITTLE_ENDIAN 1234#endif// qprocessordetection.h    /*  NOTE:  GCC 4.6 added __BYTE_ORDER__, __ORDER_BIG_ENDIAN__, __ORDER_LITTLE_ENDIAN__  and __ORDER_PDP_ENDIAN__ in SVN r165881. If you are using GCC 4.6 or newer,  this code will properly detect your target byte order; if you are not, and  the __LITTLE_ENDIAN__ or __BIG_ENDIAN__ macros are not defined, then this  code will fail to detect the target byte order.*/// Some processors support either endian format, try to detect which we are using.#if !defined(Q_BYTE_ORDER)#  if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == Q_BIG_ENDIAN || __BYTE_ORDER__ == Q_LITTLE_ENDIAN)// Reuse __BYTE_ORDER__ as-is, since our Q_*_ENDIAN #defines match the preprocessor defaults#    define Q_BYTE_ORDER __BYTE_ORDER__#  elif defined(__BIG_ENDIAN__) || defined(_big_endian__) || defined(_BIG_ENDIAN)#    define Q_BYTE_ORDER Q_BIG_ENDIAN#  elif defined(__LITTLE_ENDIAN__) || defined(_little_endian__) || defined(_LITTLE_ENDIAN) \        || defined(WINAPI_FAMILY) // WinRT is always little-endian according to MSDN.#    define Q_BYTE_ORDER Q_LITTLE_ENDIAN#  else#    error "Unable to determine byte order!"#  endif#endif

8、arch pointer

指针大小（ARCH_POINTER）定义如下所示。

// archdetect.cpp// pointer type#if defined(Q_OS_WIN64) || (defined(Q_OS_WINRT) && defined(_M_X64))#  define ARCH_POINTER "llp64"#elif defined(__LP64__) || QT_POINTER_SIZE - 0 == 8#  define ARCH_POINTER "lp64"#else#  define ARCH_POINTER "ilp32"#endif// qprocessordetection.h    /*   Size of a pointer and the machine register size. We detect a 64-bit system by:   * GCC and compatible compilers (Clang, ICC on OS X and Windows) always define     __SIZEOF_POINTER__. This catches all known cases of ILP32 builds on 64-bit     processors.   * Most other Unix compilers define __LP64__ or _LP64 on 64-bit mode     (Long and Pointer 64-bit)   * If Q_PROCESSOR_WORDSIZE was defined above, it's assumed to match the pointer     size.   Otherwise, we assume to be 32-bit and then check in qglobal.cpp that it is right.*/#if defined __SIZEOF_POINTER__#  define QT_POINTER_SIZE           __SIZEOF_POINTER__#elif defined(__LP64__) || defined(_LP64)#  define QT_POINTER_SIZE           8#elif defined(Q_PROCESSOR_WORDSIZE)#  define QT_POINTER_SIZE           Q_PROCESSOR_WORDSIZE#else#  define QT_POINTER_SIZE           4#endif

9、arch coordinate

浮点数精度（ARCH_COORD_TYPE）定义如下所示。

// archdetect.cpp// qreal type, if not double (includes the dash)#ifdef QT_COORD_TYPE_STRING#  define ARCH_COORD_TYPE   "-qreal_" QT_COORD_TYPE_STRING#else#  define ARCH_COORD_TYPE  ""#endif

10、arch abi

程序二进制接口相关的软、硬浮点（ARCH_ABI）定义如下所示。

// archdetect.cpp// secondary: ABI string (includes the dash)#if defined(__ARM_EABI__) || defined(__mips_eabi)#  define ARCH_ABI1 "-eabi"#elif defined(_MIPS_SIM)#  if _MIPS_SIM == _ABIO32#    define ARCH_ABI1 "-o32"#  elif _MIPS_SIM == _ABIN32#    define ARCH_ABI1 "-n32"#  elif _MIPS_SIM == _ABI64#    define ARCH_ABI1 "-n64"#  elif _MIPS_SIM == _ABIO64#    define ARCH_ABI1 "-o64"#  endif#else#  define ARCH_ABI1 ""#endif#if defined(__ARM_PCS_VFP) || defined(__mips_hard_float)// Use "-hardfloat" for platforms that usually have no FPUs// (and for the platforms which had "-hardfloat" before we established the rule)#  define ARCH_ABI2 "-hardfloat"#elif defined(_SOFT_FLOAT)// Use "-softfloat" for architectures that usually have FPUs#  define ARCH_ABI2 "-softfloat"#else#  define ARCH_ABI2 ""#endif#define ARCH_ABI ARCH_ABI1 ARCH_ABI2