2.1 Option summary

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

Fortran Language Options

See Options controlling Fortran dialect.

-fall-intrinsics -fallow-argument-mismatch -fallow-invalid-boz
-fbackslash -fcray-pointer -fd-lines-as-code -fd-lines-as-comments
-fdec -fdec-char-conversions -fdec-structure -fdec-intrinsic-ints
-fdec-static -fdec-math -fdec-include -fdec-format-defaults
-fdec-blank-format-item -fdefault-double-8 -fdefault-integer-8
-fdefault-real-8 -fdefault-real-10 -fdefault-real-16 -fdollar-ok
-ffixed-line-length-n -ffixed-line-length-none -fpad-source
-ffree-form -ffree-line-length-n -ffree-line-length-none
-fimplicit-none -finteger-4-integer-8 -fmax-identifier-length
-fmodule-private -ffixed-form -fno-range-check -fopenacc -fopenmp
-fopenmp-allocators -fopenmp-simd -freal-4-real-10 -freal-4-real-16
-freal-4-real-8 -freal-8-real-10 -freal-8-real-16 -freal-8-real-4
-std=std -ftest-forall-temp

Preprocessing Options

See Enable and customize preprocessing.

-A-question[=answer]
-Aquestion=answer -C -CC -Dmacro[=defn]
-H -P
-Umacro -cpp -dD -dI -dM -dN -dU -fworking-directory
-imultilib dir
-iprefix file -iquote -isysroot dir -isystem dir -nocpp 
-nostdinc
-undef

Error and Warning Options

See Options to request or suppress errors and warnings.

-Waliasing -Wall -Wampersand -Warray-bounds
-Wc-binding-type -Wcharacter-truncation -Wconversion
-Wdo-subscript -Wfunction-elimination -Wimplicit-interface
-Wimplicit-procedure -Wintrinsic-shadow -Wuse-without-only
-Wintrinsics-std -Wline-truncation -Wno-align-commons
-Wno-overwrite-recursive -Wno-tabs -Wreal-q-constant -Wsurprising
-Wunderflow -Wunused-parameter -Wrealloc-lhs -Wrealloc-lhs-all
-Wfrontend-loop-interchange -Wtarget-lifetime -fmax-errors=n
-fsyntax-only -pedantic
-pedantic-errors

Debugging Options

See Options for debugging your program.

-fbacktrace -fdebug-aux-vars -ffpe-trap=list
-ffpe-summary=list

Directory Options

See Options for directory search.

-Idir  -Jdir -fintrinsic-modules-path dir
Link Options

See Options for influencing the linking step.

-static-libgfortran  -static-libquadmath
Runtime Options

See Options for influencing runtime behavior.

-fconvert=conversion -fmax-subrecord-length=length
-frecord-marker=length -fsign-zero

Interoperability Options

See Options for interoperability.

-fc-prototypes -fc-prototypes-external
Code Generation Options

See Options for code generation conventions.

-faggressive-function-elimination -fblas-matmul-limit=n
-fbounds-check -ftail-call-workaround -ftail-call-workaround=n
-fcheck-array-temporaries
-fcheck=<all|array-temps|bits|bounds|do|mem|pointer|recursion>
-fcoarray=<none|single|lib> -fexternal-blas -ff2c
-ffrontend-loop-interchange -ffrontend-optimize
-finit-character=n -finit-integer=n -finit-local-zero
-finit-derived -finit-logical=<true|false>
-finit-real=<zero|inf|-inf|nan|snan>
-finline-matmul-limit=n
-finline-arg-packing -fmax-array-constructor=n
-fmax-stack-var-size=n -fno-align-commons -fno-automatic
-fno-protect-parens -fno-underscoring -fsecond-underscore
-fpack-derived -frealloc-lhs -frecursive -frepack-arrays
-fshort-enums -fstack-arrays

Developer Options

See GNU Fortran Developer Options.

-fdump-fortran-global -fdump-fortran-optimized
-fdump-fortran-original -fdump-parse-tree -save-temps