Predefined symbols in gcc

[joel at oarcorp.com (Joel Sherrill)]

Is p.c an empty file?

There is a tricky combination of gcc options to intermix source and
assembly.  Does anyone have that one squirreled away somewhere?

--joel


On Mon, 16 Mar 1998, Eric Norum wrote:

> Perhaps everyone else already knows this, but I just found out today.
> 
> There is an easy way to get gcc to print a list of predefined symbols:
> 	-E -pM
> 
> For example, with the egcs-1.0.2-prerelease:
> 	
> > m68k-rtems-gcc -ansi -mcpu32  -E -dM p.c | sort
> #define __GNUC_MINOR__ 90
> #define __GNUC__ 2
> #define __STRICT_ANSI__ 1
> #define __mc68000 1
> #define __mc68000__ 1
> #define __mcpu32 1
> #define __mcpu32__ 1
> #define __rtems 1
> #define __rtems__ 1
> 
> 
> > m68k-rtems-gcc -ansi -E -dM p.c | sort
> #define __GNUC_MINOR__ 90
> #define __GNUC__ 2
> #define __HAVE_68881__ 1
> #define __STRICT_ANSI__ 1
> #define __mc68000 1
> #define __mc68000__ 1
> #define __mc68020 1
> #define __mc68020__ 1
> #define __rtems 1
> #define __rtems__ 1
> 
> ---
> Eric Norum                                 eric at skatter.usask.ca
> Saskatchewan Accelerator Laboratory        Phone: (306) 966-6308
> University of Saskatchewan                 FAX:   (306) 966-6058
> Saskatoon, Canada.
>