### 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 -fdefault-double-8 -fdefault-integer-8
                -fdefault-real-8 -fdollar-ok -ffixed-line-length-n
                -ffixed-line-length-none -ffree-form -ffree-line-length-n
                -ffree-line-length-none -fimplicit-none -finteger-4-integer-8
                -fmax-identifier-length -fmodule-private -fno-fixed-form -fno-range-check
                -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

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 -Wfunction-elimination -Wimplicit-interface
                -Wimplicit-procedure -Wintrinsic-shadow -Wintrinsics-std
                -Wline-truncation -Wno-align-commons -Wno-tabs -Wreal-q-constant
                -Wsurprising -Wunderflow -Wunused-parameter -Wrealloc-lhs Wrealloc-lhs-all
                -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-parse-tree -ffpe-trap=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

Code Generation Options
  See Options for code generation conventions.

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