Option Summary

Here is a summary of all the options specific to GNU Fortran, grouped by type. Explanations are in the following sections.

Overall Options

See section Options Controlling the Kind of Output.

-fversion  -fset-g77-defaults  -fno-silent

Shorthand Options

See section Shorthand Options.

-ff66  -fno-f66  -ff77  -fno-f77  -fugly  -fno-ugly

Fortran Language Options

See section Options Controlling Fortran Dialect.

-ffree-form  -fno-fixed-form  -ff90
-fvxt  -fdollar-ok  -fno-backslash
-fno-ugly-args  -fno-ugly-assign  -fno-ugly-assumed
-fugly-comma  -fugly-complex  -fugly-init  -fugly-logint
-fonetrip  -ftypeless-boz
-fintrin-case-initcap  -fintrin-case-upper
-fintrin-case-lower  -fintrin-case-any
-fmatch-case-initcap  -fmatch-case-upper
-fmatch-case-lower  -fmatch-case-any
-fsource-case-upper -fsource-case-lower  -fsource-case-preserve
-fsymbol-case-initcap  -fsymbol-case-upper
-fsymbol-case-lower  -fsymbol-case-any
-fcase-strict-upper  -fcase-strict-lower
-fcase-initcap  -fcase-upper  -fcase-lower  -fcase-preserve
-ff2c-intrinsics-delete  -ff2c-intrinsics-hide
-ff2c-intrinsics-disable  -ff2c-intrinsics-enable
-fbadu77-intrinsics-delete  -fbadu77-intrinsics-hide
-fbadu77-intrinsics-disable  -fbadu77-intrinsics-enable
-ff90-intrinsics-delete  -ff90-intrinsics-hide
-ff90-intrinsics-disable  -ff90-intrinsics-enable
-fgnu-intrinsics-delete  -fgnu-intrinsics-hide
-fgnu-intrinsics-disable  -fgnu-intrinsics-enable
-fmil-intrinsics-delete  -fmil-intrinsics-hide
-fmil-intrinsics-disable  -fmil-intrinsics-enable
-funix-intrinsics-delete  -funix-intrinsics-hide
-funix-intrinsics-disable  -funix-intrinsics-enable
-fvxt-intrinsics-delete  -fvxt-intrinsics-hide
-fvxt-intrinsics-disable  -fvxt-intrinsics-enable
-ffixed-line-length-n  -ffixed-line-length-none

Warning Options

See section Options to Request or Suppress Warnings.

-fsyntax-only  -pedantic  -pedantic-errors  -fpedantic
-w  -Wno-globals  -Wimplicit -Wunused  -Wuninitialized
-Wall  -Wsurprising
-Werror  -W

Debugging Options

See section Options for Debugging Your Program or GNU Fortran.

-g

Optimization Options

See section Options That Control Optimization.

-malign-double
-ffloat-store  -fforce-mem  -fforce-addr  -fno-inline
-ffast-math  -fstrength-reduce  -frerun-cse-after-loop
-fexpensive-optimizations  -fdelayed-branch
-fschedule-insns  -fschedule-insn2  -fcaller-saves
-funroll-loops  -funroll-all-loops

Directory Options

See section Options for Directory Search.

-Idir  -I-

Code Generation Options

See section Options for Code Generation Conventions.

-fno-automatic  -finit-local-zero  -fno-f2c
-ff2c-library  -fno-underscoring  -fno-ident
-fpcc-struct-return  -freg-struct-return
-fshort-double  -fno-common  -fpack-struct
-fzeros  -fno-second-underscore
-fdebug-kludge  -fno-emulate-complex
-fno-globals

• Overall Options: Controlling the kind of output: an executable, object files, assembler files, or preprocessed source.
• Shorthand Options: Options that are shorthand for other options.
• Fortran Dialect Options: Controlling the variant of Fortran language compiled.
• Warning Options: How picky should the compiler be?
• Debugging Options: Symbol tables, measurements, and debugging dumps.
• Optimize Options: How much optimization?
• Preprocessor Options: Controlling header files and macro definitions. Also, getting dependency information for Make.
• Directory Options: Where to find header files and libraries. Where to find the compiler executable files.
• Code Gen Options: Specifying conventions for function calls, data layout and register usage.

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