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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 &lsquo;<samp><span class="samp">-</span></samp>&rsquo; or &lsquo;<samp><span class="samp">--</span></samp>&rsquo;. 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-102"><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-100"><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-104"><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-106"><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-65"><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-72"><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-81"><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-69"><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-75"><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-108"><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-110"><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-78"><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_007bfaggressive_002dfunction_002delimination_007d-282"><code>faggressive-function-elimination</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_007bfalign_002dcommons_007d-276"><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="Code-Gen-Options.html#index-g_t_0040code_007bfblas_002dmatmul_002dlimit_007d-269"><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-258"><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-248"><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-259"><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-246"><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-216"><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-50"><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_002dfortran_002doptimized_007d-188"><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-187"><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-189"><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-268"><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-227"><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-190"><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-275"><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-272"><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-271"><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-274"><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-273"><code>finit-real</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_007bfinteger_002d4_002dinteger_002d8_007d-49"><code>finteger-4-integer-8</code></a>: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a></li>
<li><a href="Directory-Options.html#index-g_t_0040code_007bfintrinsic_002dmodules_002dpath_007d-_0040var_007bdir_007d-209"><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-260"><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-123"><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-261"><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-219"><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-224"><code>fno-automatic</code></a>: <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a></li>
<li><a href="Debugging-Options.html#index-g_t_0040code_007bfno_002dbacktrace_007d-191"><code>fno-backtrace</code></a>: <a href="Debugging-Options.html#Debugging-Options">Debugging 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-278"><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-217"><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-232"><code>fno-underscoring</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_007bfno_002dwhole_002dfile_007d-237"><code>fno-whole-file</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-51"><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-263"><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-66"><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-53"><code>frange-check</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_007bfreal_002d4_002dreal_002d10_007d-55"><code>freal-4-real-10</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_007bfreal_002d4_002dreal_002d16_007d-56"><code>freal-4-real-16</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_007bfreal_002d4_002dreal_002d8_007d-54"><code>freal-4-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_007bfreal_002d8_002dreal_002d10_007d-58"><code>freal-8-real-10</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_007bfreal_002d8_002dreal_002d16_007d-59"><code>freal-8-real-16</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_007bfreal_002d8_002dreal_002d4_007d-57"><code>freal-8-real-4</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-280"><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-218"><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-270"><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-265"><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_007bfrontend_002doptimize_007d-284"><code>frontend-optimize</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-238"><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-297"><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-267"><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-220"><code>fsign-zero</code></a>: <a href="Runtime-Options.html#Runtime-Options">Runtime Options</a></li>
<li><a href="Code-Gen-Options.html#index-g_t_0040code_007bfstack_002darrays_007d-262"><code>fstack-arrays</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_007bfsyntax_002donly_007d-125"><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="Preprocessing-Options.html#index-g_t_0040code_007bfworking_002ddirectory_007d-84"><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-112"><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-199"><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-86"><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-88"><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-90"><code>iprefix </code><var>prefix</var></a>: <a href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a></li>
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