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An Introduction to GCC - for the GNU compilers gcc and g++
by Brian J. Gough, foreword by Richard M. Stallman
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8.3 SPARC options

On the SPARC range of processors the -mcpu=CPU option generates processor-specific code. The valid options for CPU are v7, v8 (SuperSPARC), Sparclite, Sparclet and v9 (UltraSPARC). Code produced with a specific -mcpu option will not run on other processors in the SPARC family, except where supported by the backwards-compatibility of the processor itself.

On 64-bit UltraSPARC systems the options -m32 and -m64 control code generation for 32-bit or 64-bit environments. The 32-bit environment selected by -m32 uses int, long and pointer types with a size of 32 bits. The 64-bit environment selected by -m64 uses a 32-bit int type and 64-bit long and pointer types.

ISBN 0954161793An Introduction to GCC - for the GNU compilers gcc and g++See the print edition