3.3.2 Macro Flags
Some option flags are macros that expand into a specific set of other
flags. These are provided as a convenient way to specify a number of options
that are usually expressed together to select a certain feature.
Table 3-5 Macro Option Flags
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-dalign
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-xmemalign=8s -aligncommon=16
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-f
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-aligncommon=16
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-fast
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See description of —fast for complete current expansion.
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-fnonstd
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-fns -ftrap=common
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-xia=widestneed
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-xinterval=widestneed -ftrap=%none -fns=no -fsimple=0
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-xia=strict
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-xinterval=strict -ftrap=%none -fns=no -fsimple=0
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-xtarget
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-xarch=a
-xcache=b
-xchip=c
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Settings that follow the macro flag on the command line override or
add to the the expansion of the macro.