Mail Archives: cygwin/1998/09/05/07:10:28
At 03:23 PM 9/2/98 -0500, Mumit Khan wrote:
>"Larry Hall (RFK Partners Inc)" <lhall AT rfk DOT com> writes:
>> The best argument I have for getting rid of _WIN32 from cygwin and mingw is
>> that MS docs claim _WIN32 is MS compiler specific.
>
>As far as I know, _MSC_VER, not _WIN32, is the microsoft-compiler specific
>macro. A quick look at some of the microsoft's headers, eg., pshpack1.h,
>suggests the same as well. My *rather old* on-line API docs here tell me
>that _WIN32 is specific to Microsoft Windows Operating System. Please cite
>the docs you mentiond so I can verify.
>
Below is documentation that comes with VC++ 5.0. See table 1.2 for
Microsoft specific predefined macros.
--------------------------------------------------------------------------
Predefined Macros
The compiler recognizes six predefined ANSI C macros (see Table 1.1), and the Microsoft C++ implementation provides several more (see Table 1.2). These macros take no arguments and cannot be redefined. Their value (except for __LINE__ and __FILE__) must be constant throughout compilation. Some of the predefined macros listed below are defined with multiple values. Their values can be set by selecting the corresponding menu option in Microsoft Developer Studio, or by using a command-line switch. See the tables below for more information.
Table 1.1 ANSI Predefined Macros
Macro
Description
__DATE__
The compilation date of the current source file. The date is a string literal of the form Mmm dd yyyy. The month name Mmm is the same as for dates generated by the library function asctime declared in TIME.H.
__FILE__
The name of the current source file. __FILE__ expands to a string surrounded by double quotation marks.
__LINE__
The line number in the current source file. The line number is a decimal integer constant. It can be altered with a #line directive.
__STDC__
Indicates full conformance with the ANSI C standard. Defined as the integer constant 1 only if the /Za compiler option is given and you are not compiling C++ code; otherwise is undefined.
__TIME__
The most recent compilation time of the current source file. The time is a string literal of the form hh:mm:ss.
__TIMESTAMP__
The date and time of the last modification of the current source file, expressed as a string literal in the form Ddd Mmm Date hh:mm:ss yyyy, where Ddd is the abbreviated day of the week and Date is an integer from 1 to 31.
Table 1.2 Microsoft-Specific Predefined Macros
Macro
Description
_CHAR_UNSIGNED
Default char type is unsigned. Defined when /J is specified.
__cplusplus
Defined for C++ programs only.
_CPPRTTI
Defined for code compiled with /GR (Enable Run-Time Type Information).
_CPPUNWIND
Defined for code compiled with /GX (Enable Exception Handling).
_DLL
Defined when /MD or /MDd (Multithread DLL) is specified.
_M_ALPHA
Defined for DEC ALPHA platforms. It is defined as 1 by the ALPHA compiler, and it is not defined if another compiler is used.
_M_IX86
Defined for x86 processors. See Table 1.3 for more details.
_M_MPPC
Defined for Power Macintosh platforms. Default is 601 (/QP601). See Table 1.4 for more details.
_M_MRX000
Defined for MIPS platforms. Default is 4000 (/QMR4000). See Table 1.5 for more details.
_M_PPC
Defined for PowerPC platforms. Default is 604 (/QP604). See Table 1.6 for more details.
_MFC_VER
Defines the MFC version. Defined as 0x0421 for Microsoft Foundation Class Library 4.21. Always defined.
_MSC_VER
Defines the compiler version. Defined as 1100 for Microsoft Visual C++™ 5.0. Always defined.
_MT
Defined when /MD or /MDd (Multithreaded DLL) or /MT or /MTd (Multithreaded) is specified.
_WIN32
Defined for applications for Win32®. Always defined.
As shown in following tables, the compiler generates a value for the preprocessor identifiers that reflect the processor option specified.
Table 1.3 Values for _M_IX86
Option in Developer Studio
Command-Line Option
Resulting Value
Blend
/GB
_M_IX86 = 500 (Default. Future compilers will emit a different value to reflect the dominant processor.)
Pentium
/G5
_M_IX86 = 500
Pentium Pro
/G6
_M_IX86 = 600
80386
/G3
_M_IX86 = 300
80486
/G4
_M_IX86 = 400
Table 1.4 Values for _M_MPPC
Option in development environment
Command-Line Option
Resulting Value
PowerPC 601
/QP601
_M_MPPC = 601 (Default)
PowerPC 603
/QP603
_M_MPPC = 603
PowerPC 604
/QP604
_M_MPPC = 604
PowerPC 620
/QP620
_M_MPPC = 620
Table 1.5 Values for _M_MRX000
Option in Developer Studio
Command-Line Option
Resulting Value
R4000
/QMR4000
_M_MRX000 = 4000 (Default)
R4100
/QMR4100
_M_MRX000 = 4100
R4200
/QMR4200
_M_MRX000 = 4200
R4400
/QMR4400
_M_MRX000 = 4400
R4600
/QMR4600
_M_MRX000 = 4600
R10000
/QMR10000
_M_MRX000 = 10000
Table 1.6 Values for _M_PPC
Option in Developer Studio
Command-Line Option
Resulting Value
PowerPC 601
/QP601
_M_PPC = 601
PowerPC 603
/QP603
_M_PPC = 603
PowerPC 604
/QP604
_M_PPC = 604 (Default)
PowerPC 620
/QP620
_M_PPC = 620
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