1 ; Options for the Fortran front end.
2 ; Copyright (C) 2003-2022 Free Software Foundation, Inc.
4 ; This file is part of GCC.
6 ; GCC is free software; you can redistribute it and/or modify it under
7 ; the terms of the GNU General Public License as published by the Free
8 ; Software Foundation; either version 3, or (at your option) any later
11 ; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 ; WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 ; You should have received a copy of the GNU General Public License
17 ; along with GCC; see the file COPYING3. If not see
18 ; <http://www.gnu.org/licenses/>.
20 ; See the GCC internals manual for a description of this file's format.
22 ; Please try to keep this file in ASCII collating order.
31 Fortran Separate Alias(A)
34 Fortran Joined Alias(A)
43 Fortran Separate Alias(D)
46 Fortran Joined Alias(D)
52 Fortran Separate Alias(d)
55 Fortran Joined Alias(d)
61 Fortran Separate Alias(I)
64 Fortran Joined Alias(I)
66 -include-directory-after
67 Fortran Separate Alias(idirafter)
69 -include-directory-after=
70 Fortran Joined Alias(idirafter)
73 Fortran Separate Alias(iprefix)
76 Fortran JoinedOrMissing Alias(iprefix)
82 Fortran Alias(nostdinc)
85 Fortran Separate Alias(o)
88 Fortran Joined Alias(o)
91 Fortran Undocumented Alias(E)
93 -print-missing-file-dependencies
100 Fortran Separate Alias(U)
103 Fortran Joined Alias(U)
112 Fortran NoDriverArg Separate Alias(MD)
114 -write-user-dependencies
115 Fortran NoDriverArg Separate Alias(MMD)
118 Fortran Joined Separate
130 Fortran Joined Separate
141 Fortran Joined Separate
145 Fortran Joined Separate
146 -J<directory> Put MODULE files in 'directory'.
153 Fortran Separate NoDriverArg
157 Fortran Joined Separate
169 Fortran Separate NoDriverArg
177 Fortran Joined Separate
181 Fortran Joined Separate
189 Fortran Joined Separate
197 Fortran Warning Var(warn_aliasing) LangEnabledBy(Fortran,Wall)
198 Warn about possible aliasing of dummy arguments.
201 Fortran Warning Var(warn_align_commons) Init(1)
202 Warn about alignment of COMMON blocks.
205 Fortran Warning Var(warn_ampersand) LangEnabledBy(Fortran,Wall || Wpedantic)
206 Warn about missing ampersand in continued character constants.
209 Fortran Warning Var(warn_array_temporaries)
210 Warn about creation of array temporaries.
214 Does nothing. Preserved for backward compatibility.
217 Fortran Var(warn_c_binding_type) Warning LangEnabledBy(Fortran,Wall)
218 Warn if the type of a variable might be not interoperable with C.
224 Wcharacter-truncation
225 Fortran Var(warn_character_truncation) Warning LangEnabledBy(Fortran,Wall)
226 Warn about truncated character expressions.
229 Fortran Warning Var(warn_compare_reals) LangEnabledBy(Fortran,Wextra)
230 Warn about equality comparisons involving REAL or COMPLEX expressions.
233 Fortran Var(warn_conversion) Warning LangEnabledBy(Fortran,Wall)
237 Fortran Var(warn_conversion_extra) Warning
238 Warn about most implicit conversions.
241 Fortran Var(warn_do_subscript) Warning LangEnabledBy(Fortran,Wextra)
242 Warn about possibly incorrect subscripts in do loops.
246 ; Documented in common
248 Wfrontend-loop-interchange
249 Fortran Var(flag_warn_frontend_loop_interchange)
250 Warn if loops have been interchanged.
252 Wfunction-elimination
253 Fortran Warning Var(warn_function_elimination) LangEnabledBy(Fortran,Wextra)
254 Warn about function call elimination.
257 Fortran Warning Var(warn_implicit_interface)
258 Warn about calls with implicit interface.
261 Fortran Warning Var(warn_implicit_procedure)
262 Warn about called procedures not explicitly declared.
265 Fortran Warning Var(warn_integer_division) LangEnabledBy(Fortran,Wall)
266 Warn about constant integer divisions with truncated results.
269 Fortran Warning Var(warn_line_truncation) LangEnabledBy(Fortran,Wall) Init(-1)
270 Warn about truncated source lines.
273 Fortran Var(warn_intrinsics_std) Warning LangEnabledBy(Fortran,Wall)
274 Warn on intrinsics not part of the selected standard.
277 Fortran LangEnabledBy(Fortran,Wall)
278 ; Documented in common.opt
280 Wmissing-include-dirs
282 ; Documented in C/C++
285 Fortran Var(warn_use_without_only) Warning
286 Warn about USE statements that have no ONLY qualifier.
297 Fortran Warning Var(warn_overwrite_recursive) Init(1)
298 Warn that -fno-automatic may break recursion.
302 ; Documented in common.opt
305 Fortran Warning Var(warn_real_q_constant) LangEnabledBy(Fortran,Wall)
306 Warn about real-literal-constants with 'q' exponent-letter.
309 Fortran Warning Var(warn_realloc_lhs) LangEnabledBy(Fortran,Wrealloc-lhs-all)
310 Warn when a left-hand-side array variable is reallocated.
313 Fortran Warning Var(warn_realloc_lhs_all)
314 Warn when a left-hand-side variable is reallocated.
317 Fortran Warning Var(warn_target_lifetime) LangEnabledBy(Fortran,Wall)
318 Warn if the pointer in a pointer assignment might outlive its target.
321 Fortran Warning LangEnabledBy(Fortran,Wall)
325 Fortran Warning Var(warn_surprising) LangEnabledBy(Fortran,Wall)
326 Warn about \"suspicious\" constructs.
329 Fortran Warning Var(warn_tabs) LangEnabledBy(Fortran,Wall || Wpedantic)
330 Permit nonconforming uses of the tab character.
333 Fortran Warning Var(warn_undefined_do_loop) LangEnabledBy(Fortran,Wall)
334 Warn about an invalid DO loop.
337 Fortran Warning Var(warn_underflow) Init(1)
338 Warn about underflow of numerical constant expressions.
341 Fortran LangEnabledBy(Fortran,Wall)
342 ; Documented in common.opt
345 Fortran Warning Var(warn_intrinsic_shadow) LangEnabledBy(Fortran,Wall)
346 Warn if a user-procedure has the same name as an intrinsic.
349 LangEnabledBy(Fortran,Wall)
350 ; Documented in common.opt
352 Wunused-dummy-argument
353 Fortran Warning Var(warn_unused_dummy_argument) LangEnabledBy(Fortran,Wall)
354 Warn about unused dummy arguments.
357 Fortran Warning Var(warn_zerotrip) LangEnabledBy(Fortran,Wall)
358 Warn about zero-trip DO loops.
361 Fortran Negative(nocpp)
362 Enable preprocessing.
365 Fortran Joined Negative(nocpp) Undocumented NoDWARFRecord
366 ; Internal option generated by specs from -cpp.
369 Fortran Negative(cpp)
370 Disable preprocessing.
374 ; Documented in common.opt
376 fallow-argument-mismatch
377 Fortran Var(flag_allow_argument_mismatch) LangEnabledBy(Fortran,std=legacy)
378 Accept argument mismatches in procedure calls.
380 faggressive-function-elimination
381 Fortran Var(flag_aggressive_function_elimination)
382 Eliminate multiple function invocations also for impure functions.
385 Fortran Var(flag_align_commons) Init(1)
386 Enable alignment of COMMON blocks.
389 Fortran RejectNegative Var(flag_all_intrinsics)
390 All intrinsics procedures are available regardless of selected standard.
393 Fortran RejectNegative Var(flag_allow_invalid_boz)
394 Allow a BOZ literal constant to appear in an invalid context and with X instead of Z.
396 fallow-leading-underscore
397 Fortran Undocumented Var(flag_allow_leading_underscore)
398 ; For internal use only: allow the first character of symbol names to be an underscore
401 Fortran Var(flag_automatic) Init(1)
402 Do not treat local variables and COMMON blocks as if they were named in SAVE statements.
405 Fortran Var(flag_backslash)
406 Specify that backslash in string introduces an escape character.
409 Fortran Var(flag_backtrace) Init(1)
410 Produce a backtrace when a runtime error is encountered.
413 Fortran RejectNegative Joined UInteger Var(flag_blas_matmul_limit) Init(30)
414 -fblas-matmul-limit=<n> Size of the smallest matrix for which matmul will use BLAS.
416 fbuilding-libgfortran
417 Fortran Undocumented Var(flag_building_libgfortran)
419 fcheck-array-temporaries
421 Produce a warning at runtime if a array temporary has been created for a procedure argument.
424 Fortran RejectNegative Joined Enum(gfc_convert) EnumSet Var(flag_convert) Init(GFC_FLAG_CONVERT_NATIVE)
425 -fconvert=<big-endian|little-endian|native|swap|r16_ieee|r16_ibm> The endianness used for unformatted files.
428 Name(gfc_convert) Type(enum gfc_convert) UnknownError(Unrecognized option to endianness value: %qs)
431 Enum(gfc_convert) String(big-endian) Value(GFC_FLAG_CONVERT_BIG) Set(1)
434 Enum(gfc_convert) String(little-endian) Value(GFC_FLAG_CONVERT_LITTLE) Set(1)
437 Enum(gfc_convert) String(native) Value(GFC_FLAG_CONVERT_NATIVE) Set(1)
440 Enum(gfc_convert) String(swap) Value(GFC_FLAG_CONVERT_SWAP) Set(1)
443 Enum(gfc_convert) String(r16_ieee) Value(GFC_FLAG_CONVERT_R16_IEEE) Set(2)
446 Enum(gfc_convert) String(r16_ibm) Value(GFC_FLAG_CONVERT_R16_IBM) Set(2)
449 Fortran Var(flag_cray_pointer)
450 Use the Cray Pointer extension.
453 Fortran Var(flag_c_prototypes)
454 Generate C prototypes from BIND(C) declarations.
456 fc-prototypes-external
457 Fortran Var(flag_c_prototypes_external)
458 Generate C prototypes from non-BIND(C) external procedure definitions.
461 Fortran RejectNegative
462 Ignore 'D' in column one in fixed form.
465 Fortran RejectNegative
466 Treat lines with 'D' in column one as comments.
469 Fortran Var(flag_debug_aux_vars)
470 Issue debug information for compiler-generated auxiliary variables.
473 Fortran Var(flag_dec)
474 Enable all DEC language extensions.
476 fdec-blank-format-item
477 Fortran Var(flag_dec_blank_format_item)
478 Enable the use of blank format items in format strings.
480 fdec-char-conversions
481 Fortran Var(flag_dec_char_conversions)
482 Enable the use of character literals in assignments and data statements
483 for non-character variables.
486 Fortran Var(flag_dec_include)
487 Enable legacy parsing of INCLUDE as statement.
490 Fortran Var(flag_dec_format_defaults)
491 Enable default widths for i, f and g format specifiers.
494 Fortran Var(flag_dec_intrinsic_ints)
495 Enable kind-specific variants of integer intrinsic functions.
498 Fortran Var(flag_dec_math)
499 Enable legacy math intrinsics for compatibility.
502 Fortran Var(flag_dec_structure)
503 Enable support for DEC STRUCTURE/RECORD.
506 Fortran Var(flag_dec_static)
507 Enable DEC-style STATIC and AUTOMATIC attributes.
510 Fortran Var(flag_default_double)
511 Set the default double precision kind to an 8 byte wide type.
514 Fortran Var(flag_default_integer)
515 Set the default integer kind to an 8 byte wide type.
518 Fortran Var(flag_default_real_8)
519 Set the default real kind to an 8 byte wide type.
522 Fortran Var(flag_default_real_10)
523 Set the default real kind to an 10 byte wide type.
526 Fortran Var(flag_default_real_16)
527 Set the default real kind to an 16 byte wide type.
530 Fortran Var(flag_dollar_ok)
531 Allow dollar signs in entity names.
535 Does nothing. Preserved for backward compatibility.
537 fdump-fortran-original
538 Fortran Var(flag_dump_fortran_original)
539 Display the code tree after parsing.
541 fdump-fortran-optimized
542 Fortran Var(flag_dump_fortran_optimized)
543 Display the code tree after front end optimization.
546 Fortran Var(flag_dump_fortran_global)
547 Display the global symbol table after parsing.
550 Fortran Alias(fdump-fortran-original)
551 Display the code tree after parsing; deprecated option.
554 Fortran Var(flag_external_blas)
555 Specify that an external BLAS library should be used for matmul calls on large-size arrays.
558 Fortran Var(flag_f2c)
559 Use f2c calling convention.
562 Fortran RejectNegative
563 Assume that the source file is fixed form.
566 Fortran Var(flag_test_forall_temp) Init(0)
567 Force creation of temporary to test infrequently-executed forall code.
570 Fortran RejectNegative Var(flag_integer4_kind,8)
571 Interpret any INTEGER(4) as an INTEGER(8).
573 fintrinsic-modules-path
574 Fortran RejectNegative Separate
575 Specify where to find the compiled intrinsic modules.
577 fintrinsic-modules-path=
578 Fortran RejectNegative Joined
579 Specify where to find the compiled intrinsic modules.
581 ffixed-line-length-none
582 Fortran RejectNegative Var(flag_fixed_line_length,0)
583 Allow arbitrary character line width in fixed mode.
586 Fortran RejectNegative Joined UInteger Var(flag_fixed_line_length) Init(72)
587 -ffixed-line-length-<n> Use n as character line width in fixed mode.
590 Fortran Var(flag_pad_source) Init(1)
591 Pad shorter fixed form lines to line width with spaces.
594 Fortran RejectNegative JoinedOrMissing
595 -ffpe-trap=[...] Stop on following floating point exceptions.
598 Fortran RejectNegative JoinedOrMissing
599 -ffpe-summary=[...] Print summary of floating point exceptions.
602 Fortran RejectNegative
603 Assume that the source file is free form.
605 ffree-line-length-none
606 Fortran RejectNegative Var(flag_free_line_length,0)
607 Allow arbitrary character line width in free mode.
610 Fortran RejectNegative Joined UInteger Var(flag_free_line_length) Init(132)
611 -ffree-line-length-<n> Use n as character line width in free mode.
613 ffrontend-loop-interchange
614 Fortran Var(flag_frontend_loop_interchange) Init(-1)
615 Try to interchange loops if profitable.
618 Fortran Var(flag_frontend_optimize) Init(-1)
619 Enable front end optimization.
622 Fortran Var(flag_implicit_none)
623 Specify that no implicit typing is allowed, unless overridden by explicit IMPLICIT statements.
626 Fortran RejectNegative Joined UInteger
627 -finit-character=<n> Initialize local character variables to ASCII value n.
630 Fortran Var(flag_init_derived)
631 Initialize components of derived type variables according to other init flags.
634 Fortran RejectNegative Joined
635 -finit-integer=<n> Initialize local integer variables to n.
639 Initialize local variables to zero (from g77).
642 Fortran RejectNegative Joined
643 -finit-logical=<true|false> Initialize local logical variables.
646 Fortran RejectNegative ToLower Joined Enum(gfc_init_local_real) Var(flag_init_real) Init(GFC_INIT_REAL_OFF)
647 -finit-real=<zero|snan|nan|inf|-inf> Initialize local real variables.
650 Name(gfc_init_local_real) Type(enum gfc_init_local_real) UnknownError(Unrecognized option to floating-point init value: %qs)
653 Enum(gfc_init_local_real) String(zero) Value(GFC_INIT_REAL_ZERO)
656 Enum(gfc_init_local_real) String(snan) Value(GFC_INIT_REAL_SNAN)
659 Enum(gfc_init_local_real) String(nan) Value(GFC_INIT_REAL_NAN)
662 Enum(gfc_init_local_real) String(inf) Value(GFC_INIT_REAL_INF)
665 Enum(gfc_init_local_real) String(-inf) Value(GFC_INIT_REAL_NEG_INF)
668 Fortran Var(flag_inline_arg_packing) Init(-1)
669 -finline-arg-packing Perform argument packing inline.
671 finline-matmul-limit=
672 Fortran RejectNegative Joined UInteger Var(flag_inline_matmul_limit) Init(-1)
673 -finline-matmul-limit=<n> Specify the size of the largest matrix for which matmul will be inlined.
675 fmax-array-constructor=
676 Fortran RejectNegative Joined UInteger Var(flag_max_array_constructor) Init(65535)
677 -fmax-array-constructor=<n> Maximum number of objects in an array constructor.
679 fmax-identifier-length=
680 Fortran RejectNegative Joined UInteger
681 -fmax-identifier-length=<n> Maximum identifier length.
683 fmax-subrecord-length=
684 Fortran RejectNegative Joined UInteger Var(flag_max_subrecord_length)
685 -fmax-subrecord-length=<n> Maximum length for subrecords.
688 Fortran RejectNegative Joined UInteger Var(flag_max_stack_var_size) Init(-2)
689 -fmax-stack-var-size=<n> Size in bytes of the largest array that will be put on the stack.
692 Fortran Var(flag_stack_arrays) Init(-1)
693 Put all local arrays on stack.
696 Fortran Var(flag_module_private)
697 Set default accessibility of module entities to PRIVATE.
704 Fortran LTO Joined Var(flag_openacc_dims)
716 Fortran Var(flag_pack_derived)
717 Try to lay out derived types as compactly as possible.
724 Fortran Var(flag_protect_parens) Init(-1)
725 Protect parentheses in expressions.
728 Fortran RejectNegative Joined Var(flag_pre_include) Undocumented
729 Path to header file that should be pre-included before each compilation unit.
732 Fortran Var(flag_range_check) Init(1)
733 Enable range checking during compilation.
736 Fortran RejectNegative Var(flag_real4_kind,8)
737 Interpret any REAL(4) as a REAL(8).
740 Fortran RejectNegative Var(flag_real4_kind,10)
741 Interpret any REAL(4) as a REAL(10).
744 Fortran RejectNegative Var(flag_real4_kind,16)
745 Interpret any REAL(4) as a REAL(16).
748 Fortran RejectNegative Var(flag_real8_kind,4)
749 Interpret any REAL(8) as a REAL(4).
752 Fortran RejectNegative Var(flag_real8_kind,10)
753 Interpret any REAL(8) as a REAL(10).
756 Fortran RejectNegative Var(flag_real8_kind,16)
757 Interpret any REAL(8) as a REAL(16).
760 Fortran Var(flag_realloc_lhs) Init(-1)
761 Reallocate the LHS in assignments.
764 Fortran RejectNegative Var(flag_record_marker,4)
765 Use a 4-byte record marker for unformatted files.
768 Fortran RejectNegative Var(flag_record_marker,8)
769 Use an 8-byte record marker for unformatted files.
772 Fortran Var(flag_recursive)
773 Allocate local variables on the stack to allow indirect recursion.
776 Fortran Var(flag_repack_arrays)
777 Copy array sections into a contiguous block on procedure entry.
780 Fortran RejectNegative Joined Enum(gfc_fcoarray) Var(flag_coarray) Init(GFC_FCOARRAY_NONE)
781 -fcoarray=<none|single|lib> Specify which coarray parallelization should be used.
784 Name(gfc_fcoarray) Type(enum gfc_fcoarray) UnknownError(Unrecognized option: %qs)
787 Enum(gfc_fcoarray) String(none) Value(GFC_FCOARRAY_NONE)
790 Enum(gfc_fcoarray) String(single) Value(GFC_FCOARRAY_SINGLE)
793 Enum(gfc_fcoarray) String(lib) Value(GFC_FCOARRAY_LIB)
796 Fortran RejectNegative JoinedOrMissing
797 -fcheck=[...] Specify which runtime checks are to be performed.
800 Fortran Var(flag_second_underscore) Init(-1)
801 Append a second underscore if the name already contains an underscore.
804 Fortran Var(flag_short_enums)
808 Fortran Var(flag_sign_zero) Init(1)
809 Apply negative sign to zero values.
811 ftail-call-workaround
812 Fortran Alias(ftail-call-workaround=,1,0)
814 ftail-call-workaround=
815 Fortran RejectNegative Joined UInteger IntegerRange(0, 2) Var(flag_tail_call_workaround) Init(1)
816 Disallow tail call optimization when a calling routine may have omitted character lengths.
819 Fortran Var(flag_underscoring) Init(1)
820 Append underscores to externally visible names.
824 Does nothing. Preserved for backward compatibility.
831 Fortran Joined Separate
835 Fortran Joined Separate
839 Fortran Joined Separate
843 Fortran Joined Separate
847 Fortran Joined Separate
851 Fortran Joined Separate
859 Fortran Joined Separate
860 ; Documented in common.opt
864 Statically link the GNU Fortran helper library (libgfortran).
868 Conform to the ISO Fortran 2003 standard.
872 Conform to the ISO Fortran 2008 standard.
876 Conform to the ISO Fortran 2008 standard including TS 29113.
880 Conform to the ISO Fortran 2018 standard.
884 Conform to the ISO Fortran 95 standard.
888 Conform to nothing in particular.
892 Accept extensions to support legacy code.
902 ; This comment is to ensure we retain the blank line above.