[Bug ada/24857] ada/s-auxdec.ads alignment issue for arm-rtems

["ebotcazou at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #1 from ebotcazou at gcc dot gnu dot org  2005-11-14 20:37 -------
> Joel confirmed that changing "Min (2" to "Min (4" enable this file to be
> compiled, however my reading of the source would imply that BIGGEST_ALIGNMENT
> is at least 32 on arm, so something else must be at play here, any idea?

Excerpt from config/arm/arm.h:

/* Setting STRUCTURE_SIZE_BOUNDARY to 32 produces more efficient code, but the
   value set in previous versions of this toolchain was 8, which produces more
   compact structures.  The command line option -mstructure_size_boundary=<n>
   can be used to change this value.  For compatibility with the ARM SDK
   however the value should be left at 32.  ARM SDT Reference Manual (ARM DUI
   0020D) page 2-20 says "Structures are aligned on word boundaries".
   The AAPCS specifies a value of 8.  */
#define STRUCTURE_SIZE_BOUNDARY arm_structure_size_boundary
extern int arm_structure_size_boundary;

/* This is the value used to initialize arm_structure_size_boundary.  If a
   particular arm target wants to change the default value it should change
   the definition of this macro, not STRUCTURE_SIZE_BOUNDARY.  See netbsd.h
   for an example of this.  */
#ifndef DEFAULT_STRUCTURE_SIZE_BOUNDARY
#define DEFAULT_STRUCTURE_SIZE_BOUNDARY 32
#endif


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ebotcazou at gcc dot gnu dot org changed:

           What    |Removed                     |Added
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                 CC|                            |ebotcazou at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24857