From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joern Rennecke <amylaar@cygnus.co.uk>
To: nickc@cygnus.com (Nick Clifton)
Cc: ovidiu@cup.hp.com, pb@nexus.co.uk, egcs@egcs.cygnus.com
Subject: Re: Objective C and STRUCTURE_SIZE_BOUNDARY
Date: Fri, 28 May 1999 09:38:00 -0000
Message-id: <199905281637.RAA02035@phal.cygnus.co.uk>
References: <199905281619.JAA08587@elmo.cygnus.com>
X-SW-Source: 1999-05/msg00812.html

> : Is there a way to find out at runtime what was the option passed to
> : the compiler at the build time?
> 
> Sadly no.  This feature was never really intended for widespread use.
> Some people have found that changing the default boundary (from 32 to
> 8) produces better code *under certain circumstances*.  The best way
> to use this feature is to use the default value whenever possible, and
> to only use the non-default value when speed is critical and access to
> the affected structures can be localised to user controlled source
> files.

Assuming you only support -mstructure_size_boundary=8 to set it to
eight (i.e. no whitespace, zeroes, other number bases or trailing junk),
you can do:
#define STRUCTURE_SIZE_BOUNDARY __ARM_STRUCTURE_SIZE_BOUNDARY__

#undef __ARM_STRUCTURE_SIZE_BOUNDARY__ /* Just in caers we build a native... */
#define __ARM_STRUCTURE_SIZE_BOUNDARY__ arm_structure_size_boundary

and in CPP_SPECS:

%{structure_size_boundary=8:!-D__ARM_STRUCTURE_SIZE_BOUNDARY__=8} \
%{!structure_size_boundary=8:!-D__ARM_STRUCTURE_SIZE_BOUNDARY__=32} \

From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joern Rennecke <amylaar@cygnus.co.uk>
To: nickc@cygnus.com (Nick Clifton)
Cc: ovidiu@cup.hp.com, pb@nexus.co.uk, egcs@egcs.cygnus.com
Subject: Re: Objective C and STRUCTURE_SIZE_BOUNDARY
Date: Mon, 31 May 1999 21:36:00 -0000
Message-ID: <199905281637.RAA02035@phal.cygnus.co.uk>
References: <199905281619.JAA08587@elmo.cygnus.com>
X-SW-Source: 1999-05n/msg00813.html
Message-ID: <19990531213600.2y5KRDkPfwLDb5qiBhrWwkswtqAzswjmJKtoIbftwSY@z>

> : Is there a way to find out at runtime what was the option passed to
> : the compiler at the build time?
> 
> Sadly no.  This feature was never really intended for widespread use.
> Some people have found that changing the default boundary (from 32 to
> 8) produces better code *under certain circumstances*.  The best way
> to use this feature is to use the default value whenever possible, and
> to only use the non-default value when speed is critical and access to
> the affected structures can be localised to user controlled source
> files.

Assuming you only support -mstructure_size_boundary=8 to set it to
eight (i.e. no whitespace, zeroes, other number bases or trailing junk),
you can do:
#define STRUCTURE_SIZE_BOUNDARY __ARM_STRUCTURE_SIZE_BOUNDARY__

#undef __ARM_STRUCTURE_SIZE_BOUNDARY__ /* Just in caers we build a native... */
#define __ARM_STRUCTURE_SIZE_BOUNDARY__ arm_structure_size_boundary

and in CPP_SPECS:

%{structure_size_boundary=8:!-D__ARM_STRUCTURE_SIZE_BOUNDARY__=8} \
%{!structure_size_boundary=8:!-D__ARM_STRUCTURE_SIZE_BOUNDARY__=32} \