1 ; Options for the Fortran front end.
2 ; Copyright (C) 2003-2019 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.
213 Fortran Warning Var(warn_argument_mismatch) Init(1)
214 Warn about type and rank mismatches between arguments and parameters.
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.
294 ; Documented in common.opt
297 Fortran Warning Var(warn_real_q_constant) LangEnabledBy(Fortran,Wall)
298 Warn about real-literal-constants with 'q' exponent-letter.
301 Fortran Warning Var(warn_realloc_lhs) LangEnabledBy(Fortran,Wrealloc-lhs-all)
302 Warn when a left-hand-side array variable is reallocated.
305 Fortran Warning Var(warn_realloc_lhs_all)
306 Warn when a left-hand-side variable is reallocated.
309 Fortran Warning Var(warn_target_lifetime) LangEnabledBy(Fortran,Wall)
310 Warn if the pointer in a pointer assignment might outlive its target.
313 Fortran Warning LangEnabledBy(Fortran,Wall)
317 Fortran Warning Var(warn_surprising) LangEnabledBy(Fortran,Wall)
318 Warn about \"suspicious\" constructs.
321 Fortran Warning Var(warn_tabs) LangEnabledBy(Fortran,Wall || Wpedantic)
322 Permit nonconforming uses of the tab character.
325 Fortran Warning Var(warn_undefined_do_loop) LangEnabledBy(Fortran,Wall)
326 Warn about an invalid DO loop.
329 Fortran Warning Var(warn_underflow) Init(1)
330 Warn about underflow of numerical constant expressions.
333 Fortran LangEnabledBy(Fortran,Wall)
334 ; Documented in common.opt
337 Fortran Warning Var(warn_intrinsic_shadow) LangEnabledBy(Fortran,Wall)
338 Warn if a user-procedure has the same name as an intrinsic.
341 LangEnabledBy(Fortran,Wall)
342 ; Documented in common.opt
344 Wunused-dummy-argument
345 Fortran Warning Var(warn_unused_dummy_argument) LangEnabledBy(Fortran,Wall)
346 Warn about unused dummy arguments.
349 Fortran Warning Var(warn_zerotrip) LangEnabledBy(Fortran,Wall)
350 Warn about zero-trip DO loops.
353 Fortran Negative(nocpp)
354 Enable preprocessing.
357 Fortran Joined Negative(nocpp) Undocumented NoDWARFRecord
358 ; Internal option generated by specs from -cpp.
361 Fortran Negative(cpp)
362 Disable preprocessing.
366 ; Documented in common.opt
368 faggressive-function-elimination
369 Fortran Var(flag_aggressive_function_elimination)
370 Eliminate multiple function invocations also for impure functions.
373 Fortran Var(flag_align_commons) Init(1)
374 Enable alignment of COMMON blocks.
377 Fortran RejectNegative Var(flag_all_intrinsics)
378 All intrinsics procedures are available regardless of selected standard.
380 fallow-leading-underscore
381 Fortran Undocumented Var(flag_allow_leading_underscore)
382 ; For internal use only: allow the first character of symbol names to be an underscore
385 Fortran Var(flag_automatic) Init(1)
386 Do not treat local variables and COMMON blocks as if they were named in SAVE statements.
389 Fortran Var(flag_backslash)
390 Specify that backslash in string introduces an escape character.
393 Fortran Var(flag_backtrace) Init(1)
394 Produce a backtrace when a runtime error is encountered.
397 Fortran RejectNegative Joined UInteger Var(flag_blas_matmul_limit) Init(30)
398 -fblas-matmul-limit=<n> Size of the smallest matrix for which matmul will use BLAS.
401 Fortran Var(flag_broken_callers) Init(1)
402 Disallow tail call optimization when a calling routine may have omitted character lenghts.
404 fcheck-array-temporaries
406 Produce a warning at runtime if a array temporary has been created for a procedure argument.
409 Fortran RejectNegative Joined Enum(gfc_convert) Var(flag_convert) Init(GFC_FLAG_CONVERT_NATIVE)
410 -fconvert=<big-endian|little-endian|native|swap> The endianness used for unformatted files.
413 Name(gfc_convert) Type(enum gfc_convert) UnknownError(Unrecognized option to endianness value: %qs)
416 Enum(gfc_convert) String(big-endian) Value(GFC_FLAG_CONVERT_BIG)
419 Enum(gfc_convert) String(little-endian) Value(GFC_FLAG_CONVERT_LITTLE)
422 Enum(gfc_convert) String(native) Value(GFC_FLAG_CONVERT_NATIVE)
425 Enum(gfc_convert) String(swap) Value(GFC_FLAG_CONVERT_SWAP)
428 Fortran Var(flag_cray_pointer)
429 Use the Cray Pointer extension.
432 Fortran Var(flag_c_prototypes)
433 Generate C prototypes from BIND(C) declarations.
435 fc-prototypes-external
436 Fortran Var(flag_c_prototypes_external)
437 Generate C prototypes from non-BIND(C) external procedure definitions.
440 Fortran RejectNegative
441 Ignore 'D' in column one in fixed form.
444 Fortran RejectNegative
445 Treat lines with 'D' in column one as comments.
448 Fortran Var(flag_dec)
449 Enable all DEC language extensions.
452 Fortran Var(flag_dec_include)
453 Enable legacy parsing of INCLUDE as statement.
456 Fortran Var(flag_dec_format_defaults)
457 Enable default widths for i, f and g format specifiers.
460 Fortran Var(flag_dec_intrinsic_ints)
461 Enable kind-specific variants of integer intrinsic functions.
464 Fortran Var(flag_dec_math)
465 Enable legacy math intrinsics for compatibility.
468 Fortran Var(flag_dec_structure)
469 Enable support for DEC STRUCTURE/RECORD.
472 Fortran Var(flag_dec_static)
473 Enable DEC-style STATIC and AUTOMATIC attributes.
476 Fortran Var(flag_default_double)
477 Set the default double precision kind to an 8 byte wide type.
480 Fortran Var(flag_default_integer)
481 Set the default integer kind to an 8 byte wide type.
484 Fortran Var(flag_default_real_8)
485 Set the default real kind to an 8 byte wide type.
488 Fortran Var(flag_default_real_10)
489 Set the default real kind to an 10 byte wide type.
492 Fortran Var(flag_default_real_16)
493 Set the default real kind to an 16 byte wide type.
496 Fortran Var(flag_dollar_ok)
497 Allow dollar signs in entity names.
501 Does nothing. Preserved for backward compatibility.
503 fdump-fortran-original
504 Fortran Var(flag_dump_fortran_original)
505 Display the code tree after parsing.
507 fdump-fortran-optimized
508 Fortran Var(flag_dump_fortran_optimized)
509 Display the code tree after front end optimization.
512 Fortran Alias(fdump-fortran-original)
513 Display the code tree after parsing; deprecated option.
516 Fortran Var(flag_external_blas)
517 Specify that an external BLAS library should be used for matmul calls on large-size arrays.
520 Fortran Var(flag_f2c)
521 Use f2c calling convention.
524 Fortran RejectNegative
525 Assume that the source file is fixed form.
528 Fortran Var(flag_test_forall_temp) Init(0)
529 Force creation of temporary to test infrequently-executed forall code.
532 Fortran RejectNegative Var(flag_integer4_kind,8)
533 Interpret any INTEGER(4) as an INTEGER(8).
535 fintrinsic-modules-path
536 Fortran RejectNegative Separate
537 Specify where to find the compiled intrinsic modules.
539 fintrinsic-modules-path=
540 Fortran RejectNegative Joined
541 Specify where to find the compiled intrinsic modules.
543 ffixed-line-length-none
544 Fortran RejectNegative Var(flag_fixed_line_length,0)
545 Allow arbitrary character line width in fixed mode.
548 Fortran RejectNegative Joined UInteger Var(flag_fixed_line_length) Init(72)
549 -ffixed-line-length-<n> Use n as character line width in fixed mode.
552 Fortran Var(flag_pad_source) Init(1)
553 Pad shorter fixed form lines to line width with spaces.
556 Fortran RejectNegative JoinedOrMissing
557 -ffpe-trap=[...] Stop on following floating point exceptions.
560 Fortran RejectNegative JoinedOrMissing
561 -ffpe-summary=[...] Print summary of floating point exceptions.
564 Fortran RejectNegative
565 Assume that the source file is free form.
567 ffree-line-length-none
568 Fortran RejectNegative Var(flag_free_line_length,0)
569 Allow arbitrary character line width in free mode.
572 Fortran RejectNegative Joined UInteger Var(flag_free_line_length) Init(132)
573 -ffree-line-length-<n> Use n as character line width in free mode.
575 ffrontend-loop-interchange
576 Fortran Var(flag_frontend_loop_interchange) Init(-1)
577 Try to interchange loops if profitable.
580 Fortran Var(flag_frontend_optimize) Init(-1)
581 Enable front end optimization.
584 Fortran Var(flag_implicit_none)
585 Specify that no implicit typing is allowed, unless overridden by explicit IMPLICIT statements.
588 Fortran RejectNegative Joined UInteger
589 -finit-character=<n> Initialize local character variables to ASCII value n.
592 Fortran Var(flag_init_derived)
593 Initialize components of derived type variables according to other init flags.
596 Fortran RejectNegative Joined
597 -finit-integer=<n> Initialize local integer variables to n.
601 Initialize local variables to zero (from g77).
604 Fortran RejectNegative Joined
605 -finit-logical=<true|false> Initialize local logical variables.
608 Fortran RejectNegative ToLower Joined Enum(gfc_init_local_real) Var(flag_init_real) Init(GFC_INIT_REAL_OFF)
609 -finit-real=<zero|snan|nan|inf|-inf> Initialize local real variables.
612 Name(gfc_init_local_real) Type(enum gfc_init_local_real) UnknownError(Unrecognized option to floating-point init value: %qs)
615 Enum(gfc_init_local_real) String(zero) Value(GFC_INIT_REAL_ZERO)
618 Enum(gfc_init_local_real) String(snan) Value(GFC_INIT_REAL_SNAN)
621 Enum(gfc_init_local_real) String(nan) Value(GFC_INIT_REAL_NAN)
624 Enum(gfc_init_local_real) String(inf) Value(GFC_INIT_REAL_INF)
627 Enum(gfc_init_local_real) String(-inf) Value(GFC_INIT_REAL_NEG_INF)
629 finline-matmul-limit=
630 Fortran RejectNegative Joined UInteger Var(flag_inline_matmul_limit) Init(-1)
631 -finline-matmul-limit=<n> Specify the size of the largest matrix for which matmul will be inlined.
633 fmax-array-constructor=
634 Fortran RejectNegative Joined UInteger Var(flag_max_array_constructor) Init(65535)
635 -fmax-array-constructor=<n> Maximum number of objects in an array constructor.
637 fmax-identifier-length=
638 Fortran RejectNegative Joined UInteger
639 -fmax-identifier-length=<n> Maximum identifier length.
641 fmax-subrecord-length=
642 Fortran RejectNegative Joined UInteger Var(flag_max_subrecord_length)
643 -fmax-subrecord-length=<n> Maximum length for subrecords.
646 Fortran RejectNegative Joined UInteger Var(flag_max_stack_var_size) Init(-2)
647 -fmax-stack-var-size=<n> Size in bytes of the largest array that will be put on the stack.
650 Fortran Var(flag_stack_arrays) Init(-1)
651 Put all local arrays on stack.
654 Fortran Var(flag_module_private)
655 Set default accessibility of module entities to PRIVATE.
662 Fortran LTO Joined Var(flag_openacc_dims)
674 Fortran Var(flag_pack_derived)
675 Try to lay out derived types as compactly as possible.
682 Fortran Var(flag_protect_parens) Init(-1)
683 Protect parentheses in expressions.
686 Fortran RejectNegative Joined Var(flag_pre_include) Undocumented
687 Path to header file that should be pre-included before each compilation unit.
690 Fortran Var(flag_range_check) Init(1)
691 Enable range checking during compilation.
694 Fortran RejectNegative Var(flag_real4_kind,8)
695 Interpret any REAL(4) as a REAL(8).
698 Fortran RejectNegative Var(flag_real4_kind,10)
699 Interpret any REAL(4) as a REAL(10).
702 Fortran RejectNegative Var(flag_real4_kind,16)
703 Interpret any REAL(4) as a REAL(16).
706 Fortran RejectNegative Var(flag_real8_kind,4)
707 Interpret any REAL(8) as a REAL(4).
710 Fortran RejectNegative Var(flag_real8_kind,10)
711 Interpret any REAL(8) as a REAL(10).
714 Fortran RejectNegative Var(flag_real8_kind,16)
715 Interpret any REAL(8) as a REAL(16).
718 Fortran Var(flag_realloc_lhs) Init(-1)
719 Reallocate the LHS in assignments.
722 Fortran RejectNegative Var(flag_record_marker,4)
723 Use a 4-byte record marker for unformatted files.
726 Fortran RejectNegative Var(flag_record_marker,8)
727 Use an 8-byte record marker for unformatted files.
730 Fortran Var(flag_recursive)
731 Allocate local variables on the stack to allow indirect recursion.
734 Fortran Var(flag_repack_arrays)
735 Copy array sections into a contiguous block on procedure entry.
738 Fortran RejectNegative Joined Enum(gfc_fcoarray) Var(flag_coarray) Init(GFC_FCOARRAY_NONE)
739 -fcoarray=<none|single|lib> Specify which coarray parallelization should be used.
742 Name(gfc_fcoarray) Type(enum gfc_fcoarray) UnknownError(Unrecognized option: %qs)
745 Enum(gfc_fcoarray) String(none) Value(GFC_FCOARRAY_NONE)
748 Enum(gfc_fcoarray) String(single) Value(GFC_FCOARRAY_SINGLE)
751 Enum(gfc_fcoarray) String(lib) Value(GFC_FCOARRAY_LIB)
754 Fortran RejectNegative JoinedOrMissing
755 -fcheck=[...] Specify which runtime checks are to be performed.
758 Fortran Var(flag_second_underscore) Init(-1)
759 Append a second underscore if the name already contains an underscore.
762 Fortran Var(flag_short_enums)
766 Fortran Var(flag_sign_zero) Init(1)
767 Apply negative sign to zero values.
770 Fortran Var(flag_underscoring) Init(1)
771 Append underscores to externally visible names.
775 Does nothing. Preserved for backward compatibility.
782 Fortran Joined Separate
786 Fortran Joined Separate
790 Fortran Joined Separate
794 Fortran Joined Separate
798 Fortran Joined Separate
802 Fortran Joined Separate
810 Fortran Joined Separate
811 ; Documented in common.opt
815 Statically link the GNU Fortran helper library (libgfortran).
819 Conform to the ISO Fortran 2003 standard.
823 Conform to the ISO Fortran 2008 standard.
827 Conform to the ISO Fortran 2008 standard including TS 29113.
831 Conform to the ISO Fortran 2018 standard.
835 Conform to the ISO Fortran 95 standard.
839 Conform to nothing in particular.
843 Accept extensions to support legacy code.
853 ; This comment is to ensure we retain the blank line above.