1 ; Options for the Fortran front end.
2 ; Copyright (C) 2003-2018 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.
400 fcheck-array-temporaries
402 Produce a warning at runtime if a array temporary has been created for a procedure argument.
405 Fortran RejectNegative Joined Enum(gfc_convert) Var(flag_convert) Init(GFC_FLAG_CONVERT_NATIVE)
406 -fconvert=<big-endian|little-endian|native|swap> The endianness used for unformatted files.
409 Name(gfc_convert) Type(enum gfc_convert) UnknownError(Unrecognized option to endianness value: %qs)
412 Enum(gfc_convert) String(big-endian) Value(GFC_FLAG_CONVERT_BIG)
415 Enum(gfc_convert) String(little-endian) Value(GFC_FLAG_CONVERT_LITTLE)
418 Enum(gfc_convert) String(native) Value(GFC_FLAG_CONVERT_NATIVE)
421 Enum(gfc_convert) String(swap) Value(GFC_FLAG_CONVERT_SWAP)
424 Fortran Var(flag_cray_pointer)
425 Use the Cray Pointer extension.
428 Fortran Var(flag_c_prototypes)
429 Generate C prototypes from BIND(C) declarations.
432 Fortran RejectNegative
433 Ignore 'D' in column one in fixed form.
436 Fortran RejectNegative
437 Treat lines with 'D' in column one as comments.
440 Fortran Var(flag_dec)
441 Enable all DEC language extensions.
444 Fortran Var(flag_dec_intrinsic_ints)
445 Enable kind-specific variants of integer intrinsic functions.
448 Fortran Var(flag_dec_math)
449 Enable legacy math intrinsics for compatibility.
452 Fortran Var(flag_dec_structure)
453 Enable support for DEC STRUCTURE/RECORD.
456 Fortran Var(flag_dec_static)
457 Enable DEC-style STATIC and AUTOMATIC attributes.
460 Fortran Var(flag_default_double)
461 Set the default double precision kind to an 8 byte wide type.
464 Fortran Var(flag_default_integer)
465 Set the default integer kind to an 8 byte wide type.
468 Fortran Var(flag_default_real_8)
469 Set the default real kind to an 8 byte wide type.
472 Fortran Var(flag_default_real_10)
473 Set the default real kind to an 10 byte wide type.
476 Fortran Var(flag_default_real_16)
477 Set the default real kind to an 16 byte wide type.
480 Fortran Var(flag_dollar_ok)
481 Allow dollar signs in entity names.
485 Does nothing. Preserved for backward compatibility.
487 fdump-fortran-original
488 Fortran Var(flag_dump_fortran_original)
489 Display the code tree after parsing.
491 fdump-fortran-optimized
492 Fortran Var(flag_dump_fortran_optimized)
493 Display the code tree after front end optimization.
496 Fortran Alias(fdump-fortran-original)
497 Display the code tree after parsing; deprecated option.
500 Fortran Var(flag_external_blas)
501 Specify that an external BLAS library should be used for matmul calls on large-size arrays.
504 Fortran Var(flag_f2c)
505 Use f2c calling convention.
508 Fortran RejectNegative
509 Assume that the source file is fixed form.
512 Fortran Var(flag_test_forall_temp) Init(0)
513 Force creation of temporary to test infrequently-executed forall code.
516 Fortran RejectNegative Var(flag_integer4_kind,8)
517 Interpret any INTEGER(4) as an INTEGER(8).
519 fintrinsic-modules-path
520 Fortran RejectNegative Separate
521 Specify where to find the compiled intrinsic modules.
523 fintrinsic-modules-path=
524 Fortran RejectNegative Joined
525 Specify where to find the compiled intrinsic modules.
527 ffixed-line-length-none
528 Fortran RejectNegative Var(flag_fixed_line_length,0)
529 Allow arbitrary character line width in fixed mode.
532 Fortran RejectNegative Joined UInteger Var(flag_fixed_line_length) Init(72)
533 -ffixed-line-length-<n> Use n as character line width in fixed mode.
536 Fortran RejectNegative JoinedOrMissing
537 -ffpe-trap=[...] Stop on following floating point exceptions.
540 Fortran RejectNegative JoinedOrMissing
541 -ffpe-summary=[...] Print summary of floating point exceptions.
544 Fortran RejectNegative
545 Assume that the source file is free form.
547 ffree-line-length-none
548 Fortran RejectNegative Var(flag_free_line_length,0)
549 Allow arbitrary character line width in free mode.
552 Fortran RejectNegative Joined UInteger Var(flag_free_line_length) Init(132)
553 -ffree-line-length-<n> Use n as character line width in free mode.
555 ffrontend-loop-interchange
556 Fortran Var(flag_frontend_loop_interchange) Init(-1)
557 Try to interchange loops if profitable.
560 Fortran Var(flag_frontend_optimize) Init(-1)
561 Enable front end optimization.
564 Fortran Var(flag_implicit_none)
565 Specify that no implicit typing is allowed, unless overridden by explicit IMPLICIT statements.
568 Fortran RejectNegative Joined UInteger
569 -finit-character=<n> Initialize local character variables to ASCII value n.
572 Fortran Var(flag_init_derived)
573 Initialize components of derived type variables according to other init flags.
576 Fortran RejectNegative Joined
577 -finit-integer=<n> Initialize local integer variables to n.
581 Initialize local variables to zero (from g77).
584 Fortran RejectNegative Joined
585 -finit-logical=<true|false> Initialize local logical variables.
588 Fortran RejectNegative ToLower Joined Enum(gfc_init_local_real) Var(flag_init_real) Init(GFC_INIT_REAL_OFF)
589 -finit-real=<zero|snan|nan|inf|-inf> Initialize local real variables.
592 Name(gfc_init_local_real) Type(enum gfc_init_local_real) UnknownError(Unrecognized option to floating-point init value: %qs)
595 Enum(gfc_init_local_real) String(zero) Value(GFC_INIT_REAL_ZERO)
598 Enum(gfc_init_local_real) String(snan) Value(GFC_INIT_REAL_SNAN)
601 Enum(gfc_init_local_real) String(nan) Value(GFC_INIT_REAL_NAN)
604 Enum(gfc_init_local_real) String(inf) Value(GFC_INIT_REAL_INF)
607 Enum(gfc_init_local_real) String(-inf) Value(GFC_INIT_REAL_NEG_INF)
609 finline-matmul-limit=
610 Fortran RejectNegative Joined UInteger Var(flag_inline_matmul_limit) Init(-1)
611 -finline-matmul-limit=<n> Specify the size of the largest matrix for which matmul will be inlined.
613 fmax-array-constructor=
614 Fortran RejectNegative Joined UInteger Var(flag_max_array_constructor) Init(65535)
615 -fmax-array-constructor=<n> Maximum number of objects in an array constructor.
617 fmax-identifier-length=
618 Fortran RejectNegative Joined UInteger
619 -fmax-identifier-length=<n> Maximum identifier length.
621 fmax-subrecord-length=
622 Fortran RejectNegative Joined UInteger Var(flag_max_subrecord_length)
623 -fmax-subrecord-length=<n> Maximum length for subrecords.
626 Fortran RejectNegative Joined UInteger Var(flag_max_stack_var_size) Init(-2)
627 -fmax-stack-var-size=<n> Size in bytes of the largest array that will be put on the stack.
630 Fortran Var(flag_stack_arrays) Init(-1)
631 Put all local arrays on stack.
634 Fortran Var(flag_module_private)
635 Set default accessibility of module entities to PRIVATE.
642 Fortran LTO Joined Var(flag_openacc_dims)
654 Fortran Var(flag_pack_derived)
655 Try to lay out derived types as compactly as possible.
662 Fortran Var(flag_protect_parens) Init(-1)
663 Protect parentheses in expressions.
666 Fortran Var(flag_range_check) Init(1)
667 Enable range checking during compilation.
670 Fortran RejectNegative Var(flag_real4_kind,8)
671 Interpret any REAL(4) as a REAL(8).
674 Fortran RejectNegative Var(flag_real4_kind,10)
675 Interpret any REAL(4) as a REAL(10).
678 Fortran RejectNegative Var(flag_real4_kind,16)
679 Interpret any REAL(4) as a REAL(16).
682 Fortran RejectNegative Var(flag_real8_kind,4)
683 Interpret any REAL(8) as a REAL(4).
686 Fortran RejectNegative Var(flag_real8_kind,10)
687 Interpret any REAL(8) as a REAL(10).
690 Fortran RejectNegative Var(flag_real8_kind,16)
691 Interpret any REAL(8) as a REAL(16).
694 Fortran Var(flag_realloc_lhs) Init(-1)
695 Reallocate the LHS in assignments.
698 Fortran RejectNegative Var(flag_record_marker,4)
699 Use a 4-byte record marker for unformatted files.
702 Fortran RejectNegative Var(flag_record_marker,8)
703 Use an 8-byte record marker for unformatted files.
706 Fortran Var(flag_recursive)
707 Allocate local variables on the stack to allow indirect recursion.
710 Fortran Var(flag_repack_arrays)
711 Copy array sections into a contiguous block on procedure entry.
714 Fortran RejectNegative Joined Enum(gfc_fcoarray) Var(flag_coarray) Init(GFC_FCOARRAY_NONE)
715 -fcoarray=<none|single|lib> Specify which coarray parallelization should be used.
718 Name(gfc_fcoarray) Type(enum gfc_fcoarray) UnknownError(Unrecognized option: %qs)
721 Enum(gfc_fcoarray) String(none) Value(GFC_FCOARRAY_NONE)
724 Enum(gfc_fcoarray) String(single) Value(GFC_FCOARRAY_SINGLE)
727 Enum(gfc_fcoarray) String(lib) Value(GFC_FCOARRAY_LIB)
730 Fortran RejectNegative JoinedOrMissing
731 -fcheck=[...] Specify which runtime checks are to be performed.
734 Fortran Var(flag_second_underscore) Init(-1)
735 Append a second underscore if the name already contains an underscore.
738 Fortran Var(flag_short_enums)
742 Fortran Var(flag_sign_zero) Init(1)
743 Apply negative sign to zero values.
746 Fortran Var(flag_underscoring) Init(1)
747 Append underscores to externally visible names.
751 Does nothing. Preserved for backward compatibility.
758 Fortran Joined Separate
762 Fortran Joined Separate
766 Fortran Joined Separate
770 Fortran Joined Separate
774 Fortran Joined Separate
778 Fortran Joined Separate
786 Fortran Joined Separate
787 ; Documented in common.opt
791 Statically link the GNU Fortran helper library (libgfortran).
795 Conform to the ISO Fortran 2003 standard.
799 Conform to the ISO Fortran 2008 standard.
803 Conform to the ISO Fortran 2008 standard including TS 29113.
807 Conform to the ISO Fortran 2018 standard.
811 Conform to the ISO Fortran 95 standard.
815 Conform to nothing in particular.
819 Accept extensions to support legacy code.
829 ; This comment is to ensure we retain the blank line above.