Add condition for sparcv8plus to knows instruction sets #2491
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Just for reference here is the current list of predefined macros with the compiler settings which triggered the error. Please note that
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With specific compiler options selecting the arch like
-xarch=sparc
on newer compilers like Oracle Studio 12.4 there is no definition of__sparcv8
but__sparcv8plus
which means the V9 ISA, but limited to the 32–bit subset defined by the V8plus ISA specification, without the Visual Instruction Set (VIS), and without other implementation-specific ISA extensions. So it should be the same as__sparcv8
.