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* config.gcc (all_defaults): Add arch_32 arch_64 cpu_32 cpu_64 tune_32 tune_64. (i[34567]86-*-* | x86_64-*-*): Add arch_32 arch_64 cpu_32 cpu_64 tune_32 tune_64 to supported_defaults. Allow values not supporting 64-bit mode for arch_32, cpu_32 and tune_32 for x86_64. Do not override cpu_32 or cpu_64 values from target name. (i[34567]86-*-linux*, i[34567]86-*-solaris2.1[0-9]*): Only default with_cpu_64 to generic for 64-bit-supporting configurations, not with_cpu. Remove FIXMEs. * doc/install.texi (--with-cpu-32, --with-cpu-64, --with-arch-32, --with-arch-64, --with-tune-32, --with-tune-64): Document. * config/i386/i386.h (OPT_ARCH32, OPT_ARCH64): Define. (OPTION_DEFAULT_SPECS): Add tune_32, tune_64, cpu_32, cpu_64, arch_32 and arch_64. From-SVN: r136674
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