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Dev Studio 12.5 and the VIS instruction set capability on UltraSparc T1 (T1000)

We just upgraded from Solaris Studio 12.3 to Developer Studio 12.5. We then got into problems with our T1000 Sparc machines.

12.5 seems to use the flag -xarch=sparcvis by default. This enables the VIS instruction set extention. Not a problem, just set xarch=sparc, and this should fix it? Right? No - the (Studio system) library libfsu.so.1 (fortran) also have this extention enabled.

Reading up on the T1000, it should have the VIS capability. Problem is, Solaris (5.10) reports it can not handle it (isainfo)

Anyone else seen this, or have a fix?

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