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<h2 class="unnumbered">Option Index</h2>
<p><samp><span class="command">gfortran</span></samp>'s command line options are indexed here without any
initial ‘<samp><span class="samp">-</span></samp>’ or ‘<samp><span class="samp">--</span></samp>’. Where an option has both positive and
negative forms (such as -foption and -fno-option), relevant entries in
the manual are indexed under the most appropriate form; it may sometimes
be useful to look up both forms.
<ul class="index-op" compact>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bA_002d_0040var_007bpredicate_007d_003d_0040var_007banswer_007d_007d-94"><code>A-</code><var>predicate</var><code>=</code><var>answer</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bA_0040var_007bpredicate_007d_003d_0040var_007banswer_007d_007d-92"><code>A</code><var>predicate</var><code>=</code><var>answer</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bbackslash_007d-37"><code>backslash</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bC_007d-96"><code>C</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bCC_007d-98"><code>CC</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bcpp_007d-57"><code>cpp</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bdD_007d-64"><code>dD</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bdI_007d-73"><code>dI</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bdM_007d-61"><code>dM</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bdN_007d-67"><code>dN</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bD_0040var_007bname_007d_007d-100"><code>D</code><var>name</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bD_0040var_007bname_007d_003d_0040var_007bdefinition_007d_007d-102"><code>D</code><var>name</var><code>=</code><var>definition</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bdU_007d-70"><code>dU</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfalign_002dcommons_007d-266"><code>falign-commons</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfall_002dintrinsics_007d-27"><code>fall-intrinsics</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Debugging-Options.html#index-g_t_0040code_007bfbacktrace_007d-180"><code>fbacktrace</code></a>: <a href="Debugging-Options.html#Debugging-Options">Debugging Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfblas_002dmatmul_002dlimit_007d-259"><code>fblas-matmul-limit</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfbounds_002dcheck_007d-249"><code>fbounds-check</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfcheck_007d-239"><code>fcheck</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfcheck_002darray_002dtemporaries_007d-250"><code>fcheck-array-temporaries</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfcoarray_007d-237"><code>fcoarray</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Runtime-Options.html#index-g_t_0040code_007bfconvert_003d_007d_0040var_007bconversion_007d-207"><code>fconvert=</code><var>conversion</var></a>: <a href="Runtime-Options.html#Runtime-Options">Runtime Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfcray_002dpointer_007d-49"><code>fcray-pointer</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfd_002dlines_002das_002dcode_007d-28"><code>fd-lines-as-code</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfd_002dlines_002das_002dcomments_007d-29"><code>fd-lines-as-comments</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfdefault_002ddouble_002d8_007d-30"><code>fdefault-double-8</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfdefault_002dinteger_002d8_007d-31"><code>fdefault-integer-8</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfdefault_002dreal_002d8_007d-32"><code>fdefault-real-8</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfdollar_002dok_007d-33"><code>fdollar-ok</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Debugging-Options.html#index-g_t_0040code_007bfdump_002dcore_007d-184"><code>fdump-core</code></a>: <a href="Debugging-Options.html#Debugging-Options">Debugging Options</a></li>
<li><a href="Debugging-Options.html#index-g_t_0040code_007bfdump_002dfortran_002doptimized_007d-177"><code>fdump-fortran-optimized</code></a>: <a href="Debugging-Options.html#Debugging-Options">Debugging Options</a></li>
<li><a href="Debugging-Options.html#index-g_t_0040code_007bfdump_002dfortran_002doriginal_007d-176"><code>fdump-fortran-original</code></a>: <a href="Debugging-Options.html#Debugging-Options">Debugging Options</a></li>
<li><a href="Debugging-Options.html#index-g_t_0040code_007bfdump_002dparse_002dtree_007d-178"><code>fdump-parse-tree</code></a>: <a href="Debugging-Options.html#Debugging-Options">Debugging Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfexternal_002dblas_007d-258"><code>fexternal-blas</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Code-Gen-Options.html#index-ff2c-218"><code>ff2c</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bffixed_002dline_002dlength_002d_007d_0040var_007bn_007d-43"><code>ffixed-line-length-</code><var>n</var></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Debugging-Options.html#index-g_t_0040code_007bffpe_002dtrap_003d_007d_0040var_007blist_007d-179"><code>ffpe-trap=</code><var>list</var></a>: <a href="Debugging-Options.html#Debugging-Options">Debugging Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bffree_002dform_007d-22"><code>ffree-form</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bffree_002dline_002dlength_002d_007d_0040var_007bn_007d-45"><code>ffree-line-length-</code><var>n</var></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfimplicit_002dnone_007d-48"><code>fimplicit-none</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfinit_002dcharacter_007d-265"><code>finit-character</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfinit_002dinteger_007d-262"><code>finit-integer</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfinit_002dlocal_002dzero_007d-261"><code>finit-local-zero</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfinit_002dlogical_007d-264"><code>finit-logical</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfinit_002dreal_007d-263"><code>finit-real</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Directory-Options.html#index-g_t_0040code_007bfintrinsic_002dmodules_002dpath_007d-_0040var_007bdir_007d-200"><code>fintrinsic-modules-path </code><var>dir</var></a>: <a href="Directory-Options.html#Directory-Options">Directory Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfmax_002darray_002dconstructor_007d-251"><code>fmax-array-constructor</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Error-and-Warning-Options.html#index-g_t_0040code_007bfmax_002derrors_003d_007d_0040var_007bn_007d-115"><code>fmax-errors=</code><var>n</var></a>: <a href="Error-and-Warning-Options.html#Error-and-Warning-Options">Error and Warning Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfmax_002didentifier_002dlength_003d_007d_0040var_007bn_007d-47"><code>fmax-identifier-length=</code><var>n</var></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfmax_002dstack_002dvar_002dsize_007d-252"><code>fmax-stack-var-size</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Runtime-Options.html#index-g_t_0040code_007bfmax_002dsubrecord_002dlength_003d_007d_0040var_007blength_007d-210"><code>fmax-subrecord-length=</code><var>length</var></a>: <a href="Runtime-Options.html#Runtime-Options">Runtime Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfmodule_002dprivate_007d-40"><code>fmodule-private</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfno_002dautomatic_007d-215"><code>fno-automatic</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfno_002dfixed_002dform_007d-23"><code>fno-fixed-form</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfno_002dprotect_002dparens_007d-268"><code>fno-protect-parens</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Runtime-Options.html#index-g_t_0040code_007bfno_002drange_002dcheck_007d-208"><code>fno-range-check</code></a>: <a href="Runtime-Options.html#Runtime-Options">Runtime Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfno_002dunderscoring_007d-223"><code>fno-underscoring</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfopenmp_007d-50"><code>fopenmp</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfpack_002dderived_007d-253"><code>fpack-derived</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bfpp_007d-58"><code>fpp</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bfrange_002dcheck_007d-52"><code>frange-check</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfrealloc_002dlhs_007d-270"><code>frealloc-lhs</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Runtime-Options.html#index-g_t_0040code_007bfrecord_002dmarker_003d_007d_0040var_007blength_007d-209"><code>frecord-marker=</code><var>length</var></a>: <a href="Runtime-Options.html#Runtime-Options">Runtime Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfrecursive_007d-260"><code>frecursive</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfrepack_002darrays_007d-255"><code>frepack-arrays</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfsecond_002dunderscore_007d-229"><code>fsecond-underscore</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Fortran-2003-status.html#index-g_t_0040code_007bfshort_002denums_007d-283"><code>fshort-enums</code></a>: <a href="Fortran-2003-status.html#Fortran-2003-status">Fortran 2003 status</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfshort_002denums_007d-257"><code>fshort-enums</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Runtime-Options.html#index-g_t_0040code_007bfsign_002dzero_007d-211"><code>fsign-zero</code></a>: <a href="Runtime-Options.html#Runtime-Options">Runtime Options</a></li>
<li><a href="Error-and-Warning-Options.html#index-g_t_0040code_007bfsyntax_002donly_007d-117"><code>fsyntax-only</code></a>: <a href="Error-and-Warning-Options.html#Error-and-Warning-Options">Error and Warning Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfwhole_002dfile_007d-228"><code>fwhole-file</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bfworking_002ddirectory_007d-76"><code>fworking-directory</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bH_007d-104"><code>H</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Directory-Options.html#index-g_t_0040code_007bI_007d_0040var_007bdir_007d-190"><code>I</code><var>dir</var></a>: <a href="Directory-Options.html#Directory-Options">Directory Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bidirafter-_0040var_007bdir_007d_007d-78"><code>idirafter </code><var>dir</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bimultilib-_0040var_007bdir_007d_007d-80"><code>imultilib </code><var>dir</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007biprefix-_0040var_007bprefix_007d_007d-82"><code>iprefix </code><var>prefix</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007biquote-_0040var_007bdir_007d_007d-86"><code>iquote </code><var>dir</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bisysroot-_0040var_007bdir_007d_007d-84"><code>isysroot </code><var>dir</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bisystem-_0040var_007bdir_007d_007d-88"><code>isystem </code><var>dir</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Directory-Options.html#index-g_t_0040code_007bJ_007d_0040var_007bdir_007d-196"><code>J</code><var>dir</var></a>: <a href="Directory-Options.html#Directory-Options">Directory Options</a></li>
<li><a href="Directory-Options.html#index-g_t_0040code_007bM_007d_0040var_007bdir_007d-197"><code>M</code><var>dir</var></a>: <a href="Directory-Options.html#Directory-Options">Directory Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bnostdinc_007d-90"><code>nostdinc</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bP_007d-105"><code>P</code></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
<li><a href="Error-and-Warning-Options.html#index-g_t_0040code_007bpedantic_007d-119"><code>pedantic</code></a>: <a href="Error-and-Warning-Options.html#Error-and-Warning-Options">Error and Warning Options</a></li>
<li><a href="Error-and-Warning-Options.html#index-g_t_0040code_007bpedantic_002derrors_007d-120"><code>pedantic-errors</code></a>: <a href="Error-and-Warning-Options.html#Error-and-Warning-Options">Error and Warning Options</a></li>
<li><a href="Link-Options.html#index-g_t_0040code_007bstatic_002dlibgfortran_007d-205"><code>static-libgfortran</code></a>: <a href="Link-Options.html#Link-Options">Link Options</a></li>
<li><a href="Fortran-Dialect-Options.html#index-g_t_0040code_007bstd_003d_007d_0040var_007bstd_007d-option-53"><code>std=</code><var>std</var><code> option</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Preprocessing-Options.html#index-g_t_0040code_007bU_0040var_007bname_007d_007d-107"><code>U</code><var>name</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
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