Option summary#

Options#

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 -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`|gol| :option:-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 or GNU Fortran.

-fbacktrace -fdump-fortran-optimized -fdump-fortran-original -fdebug-aux-vars -fdump-fortran-global -fdump-parse-tree -ffpe-trap=list -ffpe-summary=list

Directory Options

See Options for directory search.

-Idir -Jdir -fintrinsic-modules-path dir

Link Options

See Influencing the linking step.

-static-libgfortran -static-libquadmath

Runtime Options

See Influencing runtime behavior.

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

Interoperability Options

See Options for interoperability with other languages.

-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= -fcoarray= -fexternal-blas -ff2c -ffrontend-loop-interchange -ffrontend-optimize -finit-character=n -finit-integer=n -finit-local-zero -finit-derived -finit-logical= -finit-real=<zero|inf|-inf|nan|snan>`|gol| :option:-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