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 -fbackslash -fcray-pointer -fd-lines-as-code 
-fd-lines-as-comments 
-fdec -fdec-structure -fdec-intrinsic-ints -fdec-static -fdec-math 
-fdec-include -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
-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 -Wargument-mismatch -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-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 
-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 Options for influencing the linking step.

-static-libgfortran

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|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 
-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