Interactions

The -fast macro expands into compilation options that may affect other specified options. For example, in the following command, the expansion of the -fast macro includes -xtarget=native which reverts -xarch to one of the 32-bit architecture options.

Incorrect:

example% CC -xarch=v9 -fast test.cc

Correct:

example% CC -fast -xarch=v9 test.cc

See the description for each option to determine possible interactions.

The code generation option, the optimization level, the optimization of built-in functions, and the use of inline template files can be overridden by subsequent options (see examples). The optimization level that you specify overrides a previously set optimization level.

The –fast option includes –fns –ftrap=%none; that is, this option turns off all trapping.