Re: A few questions about building a canadian cross

• Date: Tue, 12 Nov 1996 09:27:05 -0800
• From:
  rose@netcom.com (Ken Rose)
• Reply-To:
  rose@netcom.com (Ken Rose)
• Cc: crossgcc@cygnus.com

Richard Achmatowicz writes:
	2) Problem #2 : Changing the default target 

	Another problem with the configuration I am having is setting the
	default target correctly. The default build for the m68k is -m68020
	-m68881. I just want to be able to code:
	 
	gcc -o hello -T mvme101.ld hello.c    

	to run the compiler. I went into the configuration files which are
	getting pulled in 

	m68k/m68k-coff.h
	m68k/m68k-none.h
	m68k/m68kemb.h
	m68k/coff.h
	and 
	m68k/m68k.h

	and found the blurb on setting the macro DEFAULT_TARGET. In m68k-none.h,
	I changed the value to 
	#define DEFAULT_TARGET -01405 
	which appeared to be the correct value for -m68000 only, but still got a
	default of -msoft-float when the cross compiler finally built.

	Does anyone know how to set this correctly? It seems to be tied in with
	the CPP_SPEC macro, which relates to my next question.


The value for TARGET_DEFAULT for a plain 68000 is 0, unless you want 16-bit
"int"s, in which case you want 0x20.  The TARGET_SWITCHES table describes how
to modify a given value of target_flags to accomodate a particular switch.  The
value of TARGET_DEFAULT is the bitwise OR of the various options that are 
described in the definitions of TARGET_*.  You could do it with CPP_SPEC and
friends, but it's not really the right way.

Ken Rose <rose@netcom.com>

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