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Using and Porting GNU Fortran

5.1 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 5.3 Shorthand Options.

{

-ff66 -fno-f66 -ff77 -fno-f77 -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 GCC.

{

-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 -funsafe-math-optimizations -fno-trapping-math -fexpensive-optimizations -fdelayed-branch -fschedule-insns -fschedule-insn2 -fcaller-saves -funroll-loops -funroll-all-loops -fno-move-all-movables -fno-reduce-all-givs -fno-rerun-loop-opt}

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 -femulate-complex -falias-check -fargument-alias -fargument-noalias -fno-argument-noalias-global -fno-globals -fflatten-arrays -fbounds-check -ffortran-bounds-check}

5.2 Options Controlling the Kind of Output		Controlling the kind of output: an executable, object files, assembler files, or preprocessed source.
5.3 Shorthand Options		Options that are shorthand for other options.
5.4 Options Controlling Fortran Dialect		Controlling the variant of Fortran language compiled.
5.5 Options to Request or Suppress Warnings		How picky should the compiler be?
5.6 Options for Debugging Your Program or GNU Fortran		Symbol tables, measurements, and debugging dumps.
5.7 Options That Control Optimization		How much optimization?
5.8 Options Controlling the Preprocessor		Controlling header files and macro definitions. Also, getting dependency information for Make.
5.9 Options for Directory Search		Where to find header files and libraries. Where to find the compiler executable files.
5.10 Options for Code Generation Conventions		Specifying conventions for function calls, data layout and register usage.