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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 -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 -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

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 -Wuse-without-only -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 -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

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> 
          -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