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