Robert Gamble wrote:
vs*********@gmail.com wrote:
For one of my applications I need to know what are all the
predefined system/ compiler specific macros are. All these days
I used to use "-v" or "-#" as a compiler option to figure out
the required information. But recently GCC 3.4.* compilers have
stopped throwing out this piece of information.
Is there any way I can write a piece of C program (or may be
any way) and figure out all the system and compiler specific
macros?
This cannot portably be done, why do you think you need to do this?
As far as gcc goes, from the documentation:
"Assuming you have no file foo.h, the command
touch foo.h; cpp -dM foo.h
will show all the predefined macros."
The options used will affect that result. For ex. on my system:
[1] c:\c\junk>cpp -dM -W -Wall -ansi -pedantic empty.c
#define __HAVE_BUILTIN_SETJMP__ 1
#define __unix__ 1
#define __i386__ 1
#define __SIZE_TYPE__ long unsigned int
#define __DJGPP 2
#define __USER_LABEL_PREFIX__ _
#define __tune_pentium__ 1
#define __STDC_HOSTED__ 1
#define __MSDOS__ 1
#define DJGPP 2
#define __WCHAR_TYPE__ short unsigned int
#define __DJGPP__ 2
#define __WINT_TYPE__ int
#define __tune_i586__ 1
#define __DJGPP_MINOR__ 3
#define __STRICT_ANSI__ 1
#define __GO32__ 1
#define DJGPP_MINOR 3
#define __STDC__ 1
#define __PTRDIFF_TYPE__ int
#define __DJGPP_MINOR 3
#define __REGISTER_PREFIX__
#define __NO_INLINE__ 1
#define __i386 1
#define __VERSION__ "3.2.1"
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