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Using and Porting GNU Fortran

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14.1.3 Compiler Options

g77 offers compiler options that f2c doesn't, most of which are designed to more easily accommodate legacy code:

However, f2c offers a few that g77 doesn't, like an option to have REAL default to REAL*8. It is expected that g77 will offer all of the missing options pertinent to being a Fortran compiler at some time in the future.

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