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The GNU C Library currently supports configurations that match the following patterns:
alpha*-*-linux arm-*-linux cris-*-linux hppa-*-linux ix86-*-gnu ix86-*-linux ia64-*-linux m68k-*-linux mips*-*-linux powerpc-*-linux s390-*-linux s390x-*-linux sparc-*-linux sparc64-*-linux
Former releases of this library (version 2.1 and/or 2.0) used to run on the following configurations:
Very early releases (version 1.09.1 and perhaps earlier versions) used to run on the following configurations:
alpha-dec-osf1 alpha-*-linuxecoff ix86-*-bsd4.3 ix86-*-isc2.2 ix86-*-isc3.n ix86-*-sco3.2 ix86-*-sco3.2v4 ix86-*-sysv ix86-*-sysv4 ix86-force_cpu386-none ix86-sequent-bsd i960-nindy960-none m68k-hp-bsd4.3 m68k-mvme135-none m68k-mvme136-none m68k-sony-newsos3 m68k-sony-newsos4 m68k-sun-sunos4.n mips-dec-ultrix4.n mips-sgi-irix4.n sparc-sun-solaris2.n sparc-sun-sunos4.n
Since no one has volunteered to test and fix these configurations, they are not supported at the moment. They probably don't compile; they definitely don't work anymore. Porting the library is not hard. If you are interested in doing a port, please contact the glibc maintainers by sending electronic mail to firstname.lastname@example.org.
Valid cases of `ix86' include `i386', `i486', `i586', and `i686'. All of those configurations produce a library that can run on this processor and newer processors. The GCC compiler by default generates code that's optimized for the machine it's configured for and will use the instructions available on that machine. For example if your GCC is configured for `i686', gcc will optimize for `i686' and might issue some `i686' specific instructions. To generate code for other models, you have to configure for that model and give GCC the appropriate `-march=' and `-mcpu=' compiler switches via CFLAGS.
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