1 ; Options for the Fortran front end.
2 ; Copyright (C) 2003-2020 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.
293 Fortran Warning Var(warn_overwrite_recursive) Init(1)
294 Warn that -fno-automatic may break recursion.
298 ; Documented in common.opt
301 Fortran Warning Var(warn_real_q_constant) LangEnabledBy(Fortran,Wall)
302 Warn about real-literal-constants with 'q' exponent-letter.
305 Fortran Warning Var(warn_realloc_lhs) LangEnabledBy(Fortran,Wrealloc-lhs-all)
306 Warn when a left-hand-side array variable is reallocated.
309 Fortran Warning Var(warn_realloc_lhs_all)
310 Warn when a left-hand-side variable is reallocated.
313 Fortran Warning Var(warn_target_lifetime) LangEnabledBy(Fortran,Wall)
314 Warn if the pointer in a pointer assignment might outlive its target.
317 Fortran Warning LangEnabledBy(Fortran,Wall)
321 Fortran Warning Var(warn_surprising) LangEnabledBy(Fortran,Wall)
322 Warn about \"suspicious\" constructs.
325 Fortran Warning Var(warn_tabs) LangEnabledBy(Fortran,Wall || Wpedantic)
326 Permit nonconforming uses of the tab character.
329 Fortran Warning Var(warn_undefined_do_loop) LangEnabledBy(Fortran,Wall)
330 Warn about an invalid DO loop.
333 Fortran Warning Var(warn_underflow) Init(1)
334 Warn about underflow of numerical constant expressions.
337 Fortran LangEnabledBy(Fortran,Wall)
338 ; Documented in common.opt
341 Fortran Warning Var(warn_intrinsic_shadow) LangEnabledBy(Fortran,Wall)
342 Warn if a user-procedure has the same name as an intrinsic.
345 LangEnabledBy(Fortran,Wall)
346 ; Documented in common.opt
348 Wunused-dummy-argument
349 Fortran Warning Var(warn_unused_dummy_argument) LangEnabledBy(Fortran,Wall)
350 Warn about unused dummy arguments.
353 Fortran Warning Var(warn_zerotrip) LangEnabledBy(Fortran,Wall)
354 Warn about zero-trip DO loops.
357 Fortran Negative(nocpp)
358 Enable preprocessing.
361 Fortran Joined Negative(nocpp) Undocumented NoDWARFRecord
362 ; Internal option generated by specs from -cpp.
365 Fortran Negative(cpp)
366 Disable preprocessing.
370 ; Documented in common.opt
372 fallow-argument-mismatch
373 Fortran Var(flag_allow_argument_mismatch) LangEnabledBy(Fortran,std=legacy)
374 Accept argument mismatches in procedure calls.
376 faggressive-function-elimination
377 Fortran Var(flag_aggressive_function_elimination)
378 Eliminate multiple function invocations also for impure functions.
381 Fortran Var(flag_align_commons) Init(1)
382 Enable alignment of COMMON blocks.
385 Fortran RejectNegative Var(flag_all_intrinsics)
386 All intrinsics procedures are available regardless of selected standard.
389 Fortran RejectNegative Var(flag_allow_invalid_boz)
390 Allow a BOZ literal constant to appear in an invalid context and with X instead of Z.
392 fallow-leading-underscore
393 Fortran Undocumented Var(flag_allow_leading_underscore)
394 ; For internal use only: allow the first character of symbol names to be an underscore
397 Fortran Var(flag_automatic) Init(1)
398 Do not treat local variables and COMMON blocks as if they were named in SAVE statements.
401 Fortran Var(flag_backslash)
402 Specify that backslash in string introduces an escape character.
405 Fortran Var(flag_backtrace) Init(1)
406 Produce a backtrace when a runtime error is encountered.
409 Fortran RejectNegative Joined UInteger Var(flag_blas_matmul_limit) Init(30)
410 -fblas-matmul-limit=<n> Size of the smallest matrix for which matmul will use BLAS.
412 fcheck-array-temporaries
414 Produce a warning at runtime if a array temporary has been created for a procedure argument.
417 Fortran RejectNegative Joined Enum(gfc_convert) Var(flag_convert) Init(GFC_FLAG_CONVERT_NATIVE)
418 -fconvert=<big-endian|little-endian|native|swap> The endianness used for unformatted files.
421 Name(gfc_convert) Type(enum gfc_convert) UnknownError(Unrecognized option to endianness value: %qs)
424 Enum(gfc_convert) String(big-endian) Value(GFC_FLAG_CONVERT_BIG)
427 Enum(gfc_convert) String(little-endian) Value(GFC_FLAG_CONVERT_LITTLE)
430 Enum(gfc_convert) String(native) Value(GFC_FLAG_CONVERT_NATIVE)
433 Enum(gfc_convert) String(swap) Value(GFC_FLAG_CONVERT_SWAP)
436 Fortran Var(flag_cray_pointer)
437 Use the Cray Pointer extension.
440 Fortran Var(flag_c_prototypes)
441 Generate C prototypes from BIND(C) declarations.
443 fc-prototypes-external
444 Fortran Var(flag_c_prototypes_external)
445 Generate C prototypes from non-BIND(C) external procedure definitions.
448 Fortran RejectNegative
449 Ignore 'D' in column one in fixed form.
452 Fortran RejectNegative
453 Treat lines with 'D' in column one as comments.
456 Fortran Var(flag_dec)
457 Enable all DEC language extensions.
459 fdec-blank-format-item
460 Fortran Var(flag_dec_blank_format_item)
461 Enable the use of blank format items in format strings.
463 fdec-char-conversions
464 Fortran Var(flag_dec_char_conversions)
465 Enable the use of character literals in assignments and data statements
466 for non-character variables.
469 Fortran Var(flag_dec_include)
470 Enable legacy parsing of INCLUDE as statement.
473 Fortran Var(flag_dec_format_defaults)
474 Enable default widths for i, f and g format specifiers.
477 Fortran Var(flag_dec_intrinsic_ints)
478 Enable kind-specific variants of integer intrinsic functions.
481 Fortran Var(flag_dec_math)
482 Enable legacy math intrinsics for compatibility.
485 Fortran Var(flag_dec_structure)
486 Enable support for DEC STRUCTURE/RECORD.
489 Fortran Var(flag_dec_static)
490 Enable DEC-style STATIC and AUTOMATIC attributes.
493 Fortran Var(flag_default_double)
494 Set the default double precision kind to an 8 byte wide type.
497 Fortran Var(flag_default_integer)
498 Set the default integer kind to an 8 byte wide type.
501 Fortran Var(flag_default_real_8)
502 Set the default real kind to an 8 byte wide type.
505 Fortran Var(flag_default_real_10)
506 Set the default real kind to an 10 byte wide type.
509 Fortran Var(flag_default_real_16)
510 Set the default real kind to an 16 byte wide type.
513 Fortran Var(flag_dollar_ok)
514 Allow dollar signs in entity names.
518 Does nothing. Preserved for backward compatibility.
520 fdump-fortran-original
521 Fortran Var(flag_dump_fortran_original)
522 Display the code tree after parsing.
524 fdump-fortran-optimized
525 Fortran Var(flag_dump_fortran_optimized)
526 Display the code tree after front end optimization.
529 Fortran Var(flag_dump_fortran_global)
530 Display the global symbol table after parsing.
533 Fortran Alias(fdump-fortran-original)
534 Display the code tree after parsing; deprecated option.
537 Fortran Var(flag_external_blas)
538 Specify that an external BLAS library should be used for matmul calls on large-size arrays.
541 Fortran Var(flag_f2c)
542 Use f2c calling convention.
545 Fortran RejectNegative
546 Assume that the source file is fixed form.
549 Fortran Var(flag_test_forall_temp) Init(0)
550 Force creation of temporary to test infrequently-executed forall code.
553 Fortran RejectNegative Var(flag_integer4_kind,8)
554 Interpret any INTEGER(4) as an INTEGER(8).
556 fintrinsic-modules-path
557 Fortran RejectNegative Separate
558 Specify where to find the compiled intrinsic modules.
560 fintrinsic-modules-path=
561 Fortran RejectNegative Joined
562 Specify where to find the compiled intrinsic modules.
564 ffixed-line-length-none
565 Fortran RejectNegative Var(flag_fixed_line_length,0)
566 Allow arbitrary character line width in fixed mode.
569 Fortran RejectNegative Joined UInteger Var(flag_fixed_line_length) Init(72)
570 -ffixed-line-length-<n> Use n as character line width in fixed mode.
573 Fortran Var(flag_pad_source) Init(1)
574 Pad shorter fixed form lines to line width with spaces.
577 Fortran RejectNegative JoinedOrMissing
578 -ffpe-trap=[...] Stop on following floating point exceptions.
581 Fortran RejectNegative JoinedOrMissing
582 -ffpe-summary=[...] Print summary of floating point exceptions.
585 Fortran RejectNegative
586 Assume that the source file is free form.
588 ffree-line-length-none
589 Fortran RejectNegative Var(flag_free_line_length,0)
590 Allow arbitrary character line width in free mode.
593 Fortran RejectNegative Joined UInteger Var(flag_free_line_length) Init(132)
594 -ffree-line-length-<n> Use n as character line width in free mode.
596 ffrontend-loop-interchange
597 Fortran Var(flag_frontend_loop_interchange) Init(-1)
598 Try to interchange loops if profitable.
601 Fortran Var(flag_frontend_optimize) Init(-1)
602 Enable front end optimization.
605 Fortran Var(flag_implicit_none)
606 Specify that no implicit typing is allowed, unless overridden by explicit IMPLICIT statements.
609 Fortran RejectNegative Joined UInteger
610 -finit-character=<n> Initialize local character variables to ASCII value n.
613 Fortran Var(flag_init_derived)
614 Initialize components of derived type variables according to other init flags.
617 Fortran RejectNegative Joined
618 -finit-integer=<n> Initialize local integer variables to n.
622 Initialize local variables to zero (from g77).
625 Fortran RejectNegative Joined
626 -finit-logical=<true|false> Initialize local logical variables.
629 Fortran RejectNegative ToLower Joined Enum(gfc_init_local_real) Var(flag_init_real) Init(GFC_INIT_REAL_OFF)
630 -finit-real=<zero|snan|nan|inf|-inf> Initialize local real variables.
633 Name(gfc_init_local_real) Type(enum gfc_init_local_real) UnknownError(Unrecognized option to floating-point init value: %qs)
636 Enum(gfc_init_local_real) String(zero) Value(GFC_INIT_REAL_ZERO)
639 Enum(gfc_init_local_real) String(snan) Value(GFC_INIT_REAL_SNAN)
642 Enum(gfc_init_local_real) String(nan) Value(GFC_INIT_REAL_NAN)
645 Enum(gfc_init_local_real) String(inf) Value(GFC_INIT_REAL_INF)
648 Enum(gfc_init_local_real) String(-inf) Value(GFC_INIT_REAL_NEG_INF)
651 Fortran Var(flag_inline_arg_packing) Init(-1)
652 -finline-arg-packing Perform argument packing inline.
654 finline-matmul-limit=
655 Fortran RejectNegative Joined UInteger Var(flag_inline_matmul_limit) Init(-1)
656 -finline-matmul-limit=<n> Specify the size of the largest matrix for which matmul will be inlined.
658 fmax-array-constructor=
659 Fortran RejectNegative Joined UInteger Var(flag_max_array_constructor) Init(65535)
660 -fmax-array-constructor=<n> Maximum number of objects in an array constructor.
662 fmax-identifier-length=
663 Fortran RejectNegative Joined UInteger
664 -fmax-identifier-length=<n> Maximum identifier length.
666 fmax-subrecord-length=
667 Fortran RejectNegative Joined UInteger Var(flag_max_subrecord_length)
668 -fmax-subrecord-length=<n> Maximum length for subrecords.
671 Fortran RejectNegative Joined UInteger Var(flag_max_stack_var_size) Init(-2)
672 -fmax-stack-var-size=<n> Size in bytes of the largest array that will be put on the stack.
675 Fortran Var(flag_stack_arrays) Init(-1)
676 Put all local arrays on stack.
679 Fortran Var(flag_module_private)
680 Set default accessibility of module entities to PRIVATE.
687 Fortran LTO Joined Var(flag_openacc_dims)
699 Fortran Var(flag_pack_derived)
700 Try to lay out derived types as compactly as possible.
707 Fortran Var(flag_protect_parens) Init(-1)
708 Protect parentheses in expressions.
711 Fortran RejectNegative Joined Var(flag_pre_include) Undocumented
712 Path to header file that should be pre-included before each compilation unit.
715 Fortran Var(flag_range_check) Init(1)
716 Enable range checking during compilation.
719 Fortran RejectNegative Var(flag_real4_kind,8)
720 Interpret any REAL(4) as a REAL(8).
723 Fortran RejectNegative Var(flag_real4_kind,10)
724 Interpret any REAL(4) as a REAL(10).
727 Fortran RejectNegative Var(flag_real4_kind,16)
728 Interpret any REAL(4) as a REAL(16).
731 Fortran RejectNegative Var(flag_real8_kind,4)
732 Interpret any REAL(8) as a REAL(4).
735 Fortran RejectNegative Var(flag_real8_kind,10)
736 Interpret any REAL(8) as a REAL(10).
739 Fortran RejectNegative Var(flag_real8_kind,16)
740 Interpret any REAL(8) as a REAL(16).
743 Fortran Var(flag_realloc_lhs) Init(-1)
744 Reallocate the LHS in assignments.
747 Fortran RejectNegative Var(flag_record_marker,4)
748 Use a 4-byte record marker for unformatted files.
751 Fortran RejectNegative Var(flag_record_marker,8)
752 Use an 8-byte record marker for unformatted files.
755 Fortran Var(flag_recursive)
756 Allocate local variables on the stack to allow indirect recursion.
759 Fortran Var(flag_repack_arrays)
760 Copy array sections into a contiguous block on procedure entry.
763 Fortran RejectNegative Joined Enum(gfc_fcoarray) Var(flag_coarray) Init(GFC_FCOARRAY_NONE)
764 -fcoarray=<none|single|lib> Specify which coarray parallelization should be used.
767 Name(gfc_fcoarray) Type(enum gfc_fcoarray) UnknownError(Unrecognized option: %qs)
770 Enum(gfc_fcoarray) String(none) Value(GFC_FCOARRAY_NONE)
773 Enum(gfc_fcoarray) String(single) Value(GFC_FCOARRAY_SINGLE)
776 Enum(gfc_fcoarray) String(lib) Value(GFC_FCOARRAY_LIB)
779 Fortran RejectNegative JoinedOrMissing
780 -fcheck=[...] Specify which runtime checks are to be performed.
783 Fortran Var(flag_second_underscore) Init(-1)
784 Append a second underscore if the name already contains an underscore.
787 Fortran Var(flag_short_enums)
791 Fortran Var(flag_sign_zero) Init(1)
792 Apply negative sign to zero values.
794 ftail-call-workaround
795 Fortran Alias(ftail-call-workaround=,1,0)
797 ftail-call-workaround=
798 Fortran RejectNegative Joined UInteger IntegerRange(0, 2) Var(flag_tail_call_workaround) Init(1)
799 Disallow tail call optimization when a calling routine may have omitted character lengths.
802 Fortran Var(flag_underscoring) Init(1)
803 Append underscores to externally visible names.
807 Does nothing. Preserved for backward compatibility.
814 Fortran Joined Separate
818 Fortran Joined Separate
822 Fortran Joined Separate
826 Fortran Joined Separate
830 Fortran Joined Separate
834 Fortran Joined Separate
842 Fortran Joined Separate
843 ; Documented in common.opt
847 Statically link the GNU Fortran helper library (libgfortran).
851 Conform to the ISO Fortran 2003 standard.
855 Conform to the ISO Fortran 2008 standard.
859 Conform to the ISO Fortran 2008 standard including TS 29113.
863 Conform to the ISO Fortran 2018 standard.
867 Conform to the ISO Fortran 95 standard.
871 Conform to nothing in particular.
875 Accept extensions to support legacy code.
885 ; This comment is to ensure we retain the blank line above.