* config/tc-sparc.c: (lookup_arch,init_default_arch): New functions.
(default_arch,default_init_p,sparc_arch_table): New static locals.
(sparc_arch_size): New static local.
(max_architecture): Initialize in init_default_arch.
(md_parse_options): Call init_default_arch if necessary.
Rewrite -xarch/-A processing.
(md_show_usage): Print -A values from sparc_arch_table.
(md_begin): Call init_default_arch if necessary.
(sparc_md_end): Handle both 32 and 64 bit environments.
* config/tc-sparc.h (TARGET_FORMAT): Likewise.
* acconfig.h (SPARC_V9,SPARC_ARCH64): Delete.
(DEFAULT_ARCH): Add.
* config.in: Regenerate.
* configure.in (sparc): Default DEFAULT_ARCH based on target cpu.
(SPARC_V9,SPARC_ARCH64): Delete.
* configure: Regenerate.
* config/vms-conf.h (SPARC_V9,SPARC_ARCH64): Delete.
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