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Supported Configurations

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: 

arm-*-linuxaout
arm-*-none

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 bug-glibc@gnu.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.