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Fix failure when -fno-rtti test is run in C++17 or later
[official-gcc.git] / gcc / ada / gnatlink.adb
blob5c8bb7da540fe6f0e4b6de5e75bebdebceefed3a
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- G N A T L I N K --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1996-2018, Free Software Foundation, Inc. --
10 -- --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
20 -- --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
23 -- --
24 ------------------------------------------------------------------------------
25
26 -- Gnatlink usage: please consult the gnat documentation
27
28 with ALI; use ALI;
29 with Csets;
30 with Gnatvsn; use Gnatvsn;
31 with Indepsw; use Indepsw;
32 with Namet; use Namet;
33 with Opt;
34 with Osint; use Osint;
35 with Output; use Output;
36 with Snames;
37 with Switch; use Switch;
38 with System; use System;
39 with Table;
40 with Targparm;
41 with Types;
42
43 with Ada.Command_Line; use Ada.Command_Line;
44 with Ada.Exceptions; use Ada.Exceptions;
45
46 with System.OS_Lib; use System.OS_Lib;
47 with System.CRTL;
48
49 with Interfaces.C_Streams; use Interfaces.C_Streams;
50 with Interfaces.C.Strings; use Interfaces.C.Strings;
51
52 procedure Gnatlink is
53 pragma Ident (Gnatvsn.Gnat_Static_Version_String);
54
55 Shared_Libgcc_String : constant String := "-shared-libgcc";
56 Shared_Libgcc : constant String_Access :=
57 new String'(Shared_Libgcc_String);
58 -- Used to invoke gcc when the binder is invoked with -shared
59
60 Static_Libgcc_String : constant String := "-static-libgcc";
61 Static_Libgcc : constant String_Access :=
62 new String'(Static_Libgcc_String);
63 -- Used to invoke gcc when shared libs are not used
64
65 package Gcc_Linker_Options is new Table.Table (
66 Table_Component_Type => String_Access,
67 Table_Index_Type => Integer,
68 Table_Low_Bound => 1,
69 Table_Initial => 20,
70 Table_Increment => 100,
71 Table_Name => "Gnatlink.Gcc_Linker_Options");
72 -- Comments needed ???
73
74 package Libpath is new Table.Table (
75 Table_Component_Type => Character,
76 Table_Index_Type => Integer,
77 Table_Low_Bound => 1,
78 Table_Initial => 4096,
79 Table_Increment => 100,
80 Table_Name => "Gnatlink.Libpath");
81 -- Comments needed ???
82
83 package Linker_Options is new Table.Table (
84 Table_Component_Type => String_Access,
85 Table_Index_Type => Integer,
86 Table_Low_Bound => 1,
87 Table_Initial => 20,
88 Table_Increment => 100,
89 Table_Name => "Gnatlink.Linker_Options");
90 -- Comments needed ???
91
92 package Linker_Objects is new Table.Table (
93 Table_Component_Type => String_Access,
94 Table_Index_Type => Integer,
95 Table_Low_Bound => 1,
96 Table_Initial => 20,
97 Table_Increment => 100,
98 Table_Name => "Gnatlink.Linker_Objects");
99 -- This table collects the objects file to be passed to the linker. In the
100 -- case where the linker command line is too long then programs objects
101 -- are put on the Response_File_Objects table. Note that the binder object
102 -- file and the user's objects remain in this table. This is very
103 -- important because on the GNU linker command line the -L switch is not
104 -- used to look for objects files but -L switch is used to look for
105 -- objects listed in the response file. This is not a problem with the
106 -- applications objects as they are specified with a full name.
107
108 package Response_File_Objects is new Table.Table (
109 Table_Component_Type => String_Access,
110 Table_Index_Type => Integer,
111 Table_Low_Bound => 1,
112 Table_Initial => 20,
113 Table_Increment => 100,
114 Table_Name => "Gnatlink.Response_File_Objects");
115 -- This table collects the objects file that are to be put in the response
116 -- file. Only application objects are collected there (see details in
117 -- Linker_Objects table comments)
118
119 package Binder_Options_From_ALI is new Table.Table (
120 Table_Component_Type => String_Access,
121 Table_Index_Type => Integer,
122 Table_Low_Bound => 1, -- equals low bound of Argument_List for Spawn
123 Table_Initial => 20,
124 Table_Increment => 100,
125 Table_Name => "Gnatlink.Binder_Options_From_ALI");
126 -- This table collects the switches from the ALI file of the main
127 -- subprogram.
128
129 package Binder_Options is new Table.Table (
130 Table_Component_Type => String_Access,
131 Table_Index_Type => Integer,
132 Table_Low_Bound => 1, -- equals low bound of Argument_List for Spawn
133 Table_Initial => 20,
134 Table_Increment => 100,
135 Table_Name => "Gnatlink.Binder_Options");
136 -- This table collects the arguments to be passed to compile the binder
137 -- generated file.
138
139 Gcc : String_Access := Program_Name ("gcc", "gnatlink");
140
141 Read_Mode : constant String := "r" & ASCII.NUL;
142
143 Begin_Info : constant String := "-- BEGIN Object file/option list";
144 End_Info : constant String := "-- END Object file/option list ";
145
146 Gcc_Path : String_Access;
147 Linker_Path : String_Access;
148 Output_File_Name : String_Access;
149 Ali_File_Name : String_Access;
150 Binder_Spec_Src_File : String_Access;
151 Binder_Body_Src_File : String_Access;
152 Binder_Ali_File : String_Access;
153 Binder_Obj_File : String_Access;
154
155 Base_Command_Name : String_Access;
156
157 Target_Debuggable_Suffix : String_Access;
158
159 Tname : Temp_File_Name;
160 Tname_FD : File_Descriptor := Invalid_FD;
161 -- Temporary file used by linker to pass list of object files on
162 -- certain systems with limitations on size of arguments.
163
164 Debug_Flag_Present : Boolean := False;
165 Verbose_Mode : Boolean := False;
166 Very_Verbose_Mode : Boolean := False;
167
168 Standard_Gcc : Boolean := True;
169
170 Compile_Bind_File : Boolean := True;
171 -- Set to False if bind file is not to be compiled
172
173 Create_Map_File : Boolean := False;
174 -- Set to True by switch -M. The map file name is derived from
175 -- the ALI file name (mainprog.ali => mainprog.map).
176
177 Object_List_File_Supported : Boolean;
178 for Object_List_File_Supported'Size use Character'Size;
179 pragma Import
180 (C, Object_List_File_Supported, "__gnat_objlist_file_supported");
181 -- Predicate indicating whether the linker has an option whereby the
182 -- names of object files can be passed to the linker in a file.
183
184 Object_File_Option_Ptr : Interfaces.C.Strings.chars_ptr;
185 pragma Import (C, Object_File_Option_Ptr, "__gnat_object_file_option");
186 -- Pointer to a string representing the linker option which specifies
187 -- the response file.
188
189 Object_File_Option : constant String := Value (Object_File_Option_Ptr);
190 -- The linker option which specifies the response file as a string
191
192 Using_GNU_response_file : constant Boolean :=
193 Object_File_Option'Length > 0
194 and then Object_File_Option (Object_File_Option'Last) = '@';
195 -- Whether a GNU response file is used
196
197 Object_List_File_Required : Boolean := False;
198 -- Set to True to force generation of a response file
199
200 Shared_Libgcc_Default : Character;
201 for Shared_Libgcc_Default'Size use Character'Size;
202 pragma Import
203 (C, Shared_Libgcc_Default, "__gnat_shared_libgcc_default");
204 -- Indicates wether libgcc should be statically linked (use 'T') or
205 -- dynamically linked (use 'H') by default.
206
207 function Base_Name (File_Name : String) return String;
208 -- Return just the file name part without the extension (if present)
209
210 procedure Check_Existing_Executable (File_Name : String);
211 -- Delete any existing executable to avoid accidentally updating the target
212 -- of a symbolic link, but produce a Fatail_Error if File_Name matches any
213 -- of the source file names. This avoids overwriting of extensionless
214 -- source files by accident on systems where executables do not have
215 -- extensions.
216
217 procedure Delete (Name : String);
218 -- Wrapper to unlink as status is ignored by this application
219
220 procedure Error_Msg (Message : String);
221 -- Output the error or warning Message
222
223 procedure Exit_With_Error (Error : String);
224 -- Output Error and exit program with a fatal condition
225
226 procedure Process_Args;
227 -- Go through all the arguments and build option tables
228
229 procedure Process_Binder_File (Name : String);
230 -- Reads the binder file and extracts linker arguments
231
232 procedure Usage;
233 -- Display usage
234
235 procedure Write_Header;
236 -- Show user the program name, version and copyright
237
238 procedure Write_Usage;
239 -- Show user the program options
240
241 ---------------
242 -- Base_Name --
243 ---------------
244
245 function Base_Name (File_Name : String) return String is
246 Findex1 : Natural;
247 Findex2 : Natural;
248
249 begin
250 Findex1 := File_Name'First;
251
252 -- The file might be specified by a full path name. However,
253 -- we want the path to be stripped away.
254
255 for J in reverse File_Name'Range loop
256 if Is_Directory_Separator (File_Name (J)) then
257 Findex1 := J + 1;
258 exit;
259 end if;
260 end loop;
261
262 Findex2 := File_Name'Last;
263 while Findex2 > Findex1 and then File_Name (Findex2) /= '.' loop
264 Findex2 := Findex2 - 1;
265 end loop;
266
267 if Findex2 = Findex1 then
268 Findex2 := File_Name'Last + 1;
269 end if;
270
271 return File_Name (Findex1 .. Findex2 - 1);
272 end Base_Name;
273
274 -------------------------------
275 -- Check_Existing_Executable --
276 -------------------------------
277
278 procedure Check_Existing_Executable (File_Name : String) is
279 Ename : String := File_Name;
280 Efile : File_Name_Type;
281 Sfile : File_Name_Type;
282
283 begin
284 Canonical_Case_File_Name (Ename);
285 Name_Len := 0;
286 Add_Str_To_Name_Buffer (Ename);
287 Efile := Name_Find;
288
289 for J in Units.Table'First .. Units.Last loop
290 Sfile := Units.Table (J).Sfile;
291 if Sfile = Efile then
292 Exit_With_Error
293 ("executable name """ & File_Name & """ matches "
294 & "source file name """ & Get_Name_String (Sfile) & """");
295 end if;
296 end loop;
297
298 Delete (File_Name);
299 end Check_Existing_Executable;
300
301 ------------
302 -- Delete --
303 ------------
304
305 procedure Delete (Name : String) is
306 Status : int;
307 pragma Unreferenced (Status);
308 begin
309 Status := unlink (Name'Address);
310 -- Is it really right to ignore an error here ???
311 end Delete;
312
313 ---------------
314 -- Error_Msg --
315 ---------------
316
317 procedure Error_Msg (Message : String) is
318 begin
319 Write_Str (Base_Command_Name.all);
320 Write_Str (": ");
321 Write_Str (Message);
322 Write_Eol;
323 end Error_Msg;
324
325 ---------------------
326 -- Exit_With_Error --
327 ---------------------
328
329 procedure Exit_With_Error (Error : String) is
330 begin
331 Error_Msg (Error);
332 Exit_Program (E_Fatal);
333 end Exit_With_Error;
334
335 ------------------
336 -- Process_Args --
337 ------------------
338
339 procedure Process_Args is
340 Next_Arg : Integer;
341
342 Skip_Next : Boolean := False;
343 -- Set to true if the next argument is to be added into the list of
344 -- linker's argument without parsing it.
345
346 procedure Check_Version_And_Help is new Check_Version_And_Help_G (Usage);
347
348 -- Start of processing for Process_Args
349
350 begin
351 -- First, check for --version and --help
352
353 Check_Version_And_Help ("GNATLINK", "1996");
354
355 -- Loop through arguments of gnatlink command
356
357 Next_Arg := 1;
358 loop
359 exit when Next_Arg > Argument_Count;
360
361 Process_One_Arg : declare
362 Arg : constant String := Argument (Next_Arg);
363
364 begin
365 -- Case of argument which is a switch
366
367 -- We definitely need section by section comments here ???
368
369 if Skip_Next then
370
371 -- This argument must not be parsed, just add it to the
372 -- list of linker's options.
373
374 Skip_Next := False;
375
376 Linker_Options.Increment_Last;
377 Linker_Options.Table (Linker_Options.Last) :=
378 new String'(Arg);
379
380 elsif Arg'Length /= 0 and then Arg (1) = '-' then
381 if Arg'Length > 4 and then Arg (2 .. 5) = "gnat" then
382 Exit_With_Error
383 ("invalid switch: """ & Arg & """ (gnat not needed here)");
384 end if;
385
386 if Arg = "-Xlinker" then
387
388 -- Next argument should be sent directly to the linker.
389 -- We do not want to parse it here.
390
391 Skip_Next := True;
392
393 Linker_Options.Increment_Last;
394 Linker_Options.Table (Linker_Options.Last) :=
395 new String'(Arg);
396
397 elsif Arg (2) = 'g'
398 and then (Arg'Length < 5 or else Arg (2 .. 5) /= "gnat")
399 then
400 Debug_Flag_Present := True;
401
402 Linker_Options.Increment_Last;
403 Linker_Options.Table (Linker_Options.Last) :=
404 new String'(Arg);
405
406 Binder_Options.Increment_Last;
407 Binder_Options.Table (Binder_Options.Last) :=
408 Linker_Options.Table (Linker_Options.Last);
409
410 elsif Arg'Length >= 3 and then Arg (2) = 'M' then
411 declare
412 Switches : String_List_Access;
413
414 begin
415 Convert (Map_File, Arg (3 .. Arg'Last), Switches);
416
417 if Switches /= null then
418 for J in Switches'Range loop
419 Linker_Options.Increment_Last;
420 Linker_Options.Table (Linker_Options.Last) :=
421 Switches (J);
422 end loop;
423 end if;
424 end;
425
426 elsif Arg'Length = 2 then
427 case Arg (2) is
428 when 'f' =>
429 if Object_List_File_Supported then
430 Object_List_File_Required := True;
431 else
432 Exit_With_Error
433 ("Object list file not supported on this target");
434 end if;
435
436 when 'M' =>
437 Create_Map_File := True;
438
439 when 'n' =>
440 Compile_Bind_File := False;
441
442 when 'o' =>
443 Next_Arg := Next_Arg + 1;
444
445 if Next_Arg > Argument_Count then
446 Exit_With_Error ("Missing argument for -o");
447 end if;
448
449 Output_File_Name :=
450 new String'(Executable_Name
451 (Argument (Next_Arg),
452 Only_If_No_Suffix => True));
453
454 when 'P' =>
455 Opt.CodePeer_Mode := True;
456
457 when 'R' =>
458 Opt.Run_Path_Option := False;
459
460 when 'v' =>
461
462 -- Support "double" verbose mode. Second -v
463 -- gets sent to the linker and binder phases.
464
465 if Verbose_Mode then
466 Very_Verbose_Mode := True;
467
468 Linker_Options.Increment_Last;
469 Linker_Options.Table (Linker_Options.Last) :=
470 new String'(Arg);
471
472 Binder_Options.Increment_Last;
473 Binder_Options.Table (Binder_Options.Last) :=
474 Linker_Options.Table (Linker_Options.Last);
475
476 else
477 Verbose_Mode := True;
478
479 end if;
480
481 when others =>
482 Linker_Options.Increment_Last;
483 Linker_Options.Table (Linker_Options.Last) :=
484 new String'(Arg);
485
486 end case;
487
488 elsif Arg (2) = 'B' then
489 Linker_Options.Increment_Last;
490 Linker_Options.Table (Linker_Options.Last) :=
491 new String'(Arg);
492
493 Binder_Options.Increment_Last;
494 Binder_Options.Table (Binder_Options.Last) :=
495 Linker_Options.Table (Linker_Options.Last);
496
497 elsif Arg'Length >= 7 and then Arg (1 .. 7) = "--LINK=" then
498 if Arg'Length = 7 then
499 Exit_With_Error ("Missing argument for --LINK=");
500 end if;
501
502 declare
503 L_Args : constant Argument_List_Access :=
504 Argument_String_To_List (Arg (8 .. Arg'Last));
505 begin
506 -- The linker program is the first argument
507
508 Linker_Path :=
509 System.OS_Lib.Locate_Exec_On_Path (L_Args.all (1).all);
510
511 if Linker_Path = null then
512 Exit_With_Error
513 ("Could not locate linker: " & L_Args.all (1).all);
514 end if;
515
516 -- The other arguments are passed as-is to the linker and
517 -- override those coming from --GCC= if any.
518
519 if L_Args.all'Last >= 2 then
520 Gcc_Linker_Options.Set_Last (0);
521 end if;
522
523 for J in 2 .. L_Args.all'Last loop
524 Gcc_Linker_Options.Increment_Last;
525 Gcc_Linker_Options.Table
526 (Gcc_Linker_Options.Last) :=
527 new String'(L_Args.all (J).all);
528 end loop;
529 end;
530
531 elsif Arg'Length >= 6 and then Arg (1 .. 6) = "--GCC=" then
532 if Arg'Length = 6 then
533 Exit_With_Error ("Missing argument for --GCC=");
534 end if;
535
536 declare
537 Program_Args : constant Argument_List_Access :=
538 Argument_String_To_List
539 (Arg (7 .. Arg'Last));
540
541 begin
542 if Program_Args.all (1).all /= Gcc.all then
543 Gcc := new String'(Program_Args.all (1).all);
544 Standard_Gcc := False;
545 end if;
546
547 -- Set appropriate flags for switches passed
548
549 for J in 2 .. Program_Args.all'Last loop
550 declare
551 Arg : constant String := Program_Args.all (J).all;
552 AF : constant Integer := Arg'First;
553
554 begin
555 if Arg'Length /= 0 and then Arg (AF) = '-' then
556 if Arg (AF + 1) = 'g'
557 and then (Arg'Length = 2
558 or else Arg (AF + 2) in '0' .. '3'
559 or else Arg (AF + 2 .. Arg'Last) = "coff")
560 then
561 Debug_Flag_Present := True;
562 end if;
563 end if;
564
565 -- Add directory to source search dirs so that
566 -- Get_Target_Parameters can find system.ads
567
568 if Arg (AF .. AF + 1) = "-I"
569 and then Arg'Length > 2
570 then
571 Add_Src_Search_Dir (Arg (AF + 2 .. Arg'Last));
572 end if;
573
574 -- Pass to gcc for compiling binder generated file
575 -- No use passing libraries, it will just generate
576 -- a warning
577
578 if not (Arg (AF .. AF + 1) = "-l"
579 or else Arg (AF .. AF + 1) = "-L")
580 then
581 Binder_Options.Increment_Last;
582 Binder_Options.Table (Binder_Options.Last) :=
583 new String'(Arg);
584 end if;
585
586 -- Pass to gcc for linking program
587
588 Gcc_Linker_Options.Increment_Last;
589 Gcc_Linker_Options.Table
590 (Gcc_Linker_Options.Last) := new String'(Arg);
591 end;
592 end loop;
593 end;
594
595 -- Send all multi-character switches not recognized as
596 -- a special case by gnatlink to the linker/loader stage.
597
598 else
599 Linker_Options.Increment_Last;
600 Linker_Options.Table (Linker_Options.Last) :=
601 new String'(Arg);
602 end if;
603
604 -- Here if argument is a file name rather than a switch
605
606 else
607 -- If explicit ali file, capture it
608
609 if Arg'Length > 4
610 and then Arg (Arg'Last - 3 .. Arg'Last) = ".ali"
611 then
612 if Ali_File_Name = null then
613 Ali_File_Name := new String'(Arg);
614 else
615 Exit_With_Error ("cannot handle more than one ALI file");
616 end if;
617
618 -- If target object file, record object file
619
620 elsif Arg'Length > Get_Target_Object_Suffix.all'Length
621 and then Arg
622 (Arg'Last -
623 Get_Target_Object_Suffix.all'Length + 1 .. Arg'Last)
624 = Get_Target_Object_Suffix.all
625 then
626 Linker_Objects.Increment_Last;
627 Linker_Objects.Table (Linker_Objects.Last) :=
628 new String'(Arg);
629
630 -- If host object file, record object file
631
632 elsif Arg'Length > Get_Object_Suffix.all'Length
633 and then Arg
634 (Arg'Last - Get_Object_Suffix.all'Length + 1 .. Arg'Last)
635 = Get_Object_Suffix.all
636 then
637 Linker_Objects.Increment_Last;
638 Linker_Objects.Table (Linker_Objects.Last) :=
639 new String'(Arg);
640
641 -- If corresponding ali file exists, capture it
642
643 elsif Ali_File_Name = null
644 and then Is_Regular_File (Arg & ".ali")
645 then
646 Ali_File_Name := new String'(Arg & ".ali");
647
648 -- Otherwise assume this is a linker options entry, but
649 -- see below for interesting adjustment to this assumption.
650
651 else
652 Linker_Options.Increment_Last;
653 Linker_Options.Table (Linker_Options.Last) :=
654 new String'(Arg);
655 end if;
656 end if;
657 end Process_One_Arg;
658
659 Next_Arg := Next_Arg + 1;
660 end loop;
661
662 -- Compile the bind file with warnings suppressed, because
663 -- otherwise the with of the main program may cause junk warnings.
664
665 Binder_Options.Increment_Last;
666 Binder_Options.Table (Binder_Options.Last) := new String'("-gnatws");
667
668 -- If we did not get an ali file at all, and we had at least one
669 -- linker option, then assume that was the intended ali file after
670 -- all, so that we get a nicer message later on.
671
672 if Ali_File_Name = null
673 and then Linker_Options.Last >= Linker_Options.First
674 then
675 Ali_File_Name :=
676 new String'(Linker_Options.Table (Linker_Options.First).all
677 & ".ali");
678 end if;
679 end Process_Args;
680
681 -------------------------
682 -- Process_Binder_File --
683 -------------------------
684
685 procedure Process_Binder_File (Name : String) is
686 Fd : FILEs;
687 -- Binder file's descriptor
688
689 Link_Bytes : Integer := 0;
690 -- Projected number of bytes for the linker command line
691
692 Link_Max : Integer;
693 pragma Import (C, Link_Max, "__gnat_link_max");
694 -- Maximum number of bytes on the command line supported by the OS
695 -- linker. Passed this limit the response file mechanism must be used
696 -- if supported.
697
698 Next_Line : String (1 .. 1000);
699 -- Current line value
700
701 Nlast : Integer;
702 Nfirst : Integer;
703 -- Current line slice (the slice does not contain line terminator)
704
705 Last : Integer;
706 -- Current line last character for shared libraries (without version)
707
708 Objs_Begin : Integer := 0;
709 -- First object file index in Linker_Objects table
710
711 Objs_End : Integer := 0;
712 -- Last object file index in Linker_Objects table
713
714 Status : int;
715 pragma Warnings (Off, Status);
716 -- Used for various Interfaces.C_Streams calls
717
718 Closing_Status : Boolean;
719 pragma Warnings (Off, Closing_Status);
720 -- For call to Close
721
722 GNAT_Static : Boolean := False;
723 -- Save state of -static option
724
725 GNAT_Shared : Boolean := False;
726 -- Save state of -shared option
727
728 Xlinker_Was_Previous : Boolean := False;
729 -- Indicate that "-Xlinker" was the option preceding the current option.
730 -- If True, then the current option is never suppressed.
731
732 -- Rollback data
733
734 -- These data items are used to store current binder file context. The
735 -- context is composed of the file descriptor position and the current
736 -- line together with the slice indexes (first and last position) for
737 -- this line. The rollback data are used by the Store_File_Context and
738 -- Rollback_File_Context routines below. The file context mechanism
739 -- interact only with the Get_Next_Line call. For example:
740
741 -- Store_File_Context;
742 -- Get_Next_Line;
743 -- Rollback_File_Context;
744 -- Get_Next_Line;
745
746 -- Both Get_Next_Line calls above will read the exact same data from
747 -- the file. In other words, Next_Line, Nfirst and Nlast variables
748 -- will be set with the exact same values.
749
750 RB_File_Pos : long; -- File position
751 RB_Next_Line : String (1 .. 1000); -- Current line content
752 RB_Nlast : Integer; -- Slice last index
753 RB_Nfirst : Integer; -- Slice first index
754
755 Run_Path_Option_Ptr : Interfaces.C.Strings.chars_ptr;
756 pragma Import (C, Run_Path_Option_Ptr, "__gnat_run_path_option");
757 -- Pointer to string representing the native linker option which
758 -- specifies the path where the dynamic loader should find shared
759 -- libraries. Equal to null string if this system doesn't support it.
760
761 Libgcc_Subdir_Ptr : Interfaces.C.Strings.chars_ptr;
762 pragma Import (C, Libgcc_Subdir_Ptr, "__gnat_default_libgcc_subdir");
763 -- Pointer to string indicating the installation subdirectory where
764 -- a default shared libgcc might be found.
765
766 Object_Library_Ext_Ptr : Interfaces.C.Strings.chars_ptr;
767 pragma Import
768 (C, Object_Library_Ext_Ptr, "__gnat_object_library_extension");
769 -- Pointer to string specifying the default extension for
770 -- object libraries, e.g. Unix uses ".a".
771
772 Separate_Run_Path_Options : Boolean;
773 for Separate_Run_Path_Options'Size use Character'Size;
774 pragma Import
775 (C, Separate_Run_Path_Options, "__gnat_separate_run_path_options");
776 -- Whether separate rpath options should be emitted for each directory
777
778 procedure Get_Next_Line;
779 -- Read the next line from the binder file without the line
780 -- terminator.
781
782 function Index (S, Pattern : String) return Natural;
783 -- Return the last occurrence of Pattern in S, or 0 if none
784
785 procedure Store_File_Context;
786 -- Store current file context, Fd position and current line data.
787 -- The file context is stored into the rollback data above (RB_*).
788 -- Store_File_Context can be called at any time, only the last call
789 -- will be used (i.e. this routine overwrites the file context).
790
791 procedure Rollback_File_Context;
792 -- Restore file context from rollback data. This routine must be called
793 -- after Store_File_Context. The binder file context will be restored
794 -- with the data stored by the last Store_File_Context call.
795
796 procedure Write_RF (S : String);
797 -- Write a string to the response file and check if it was successful.
798 -- Fail the program if it was not successful (disk full).
799
800 -------------------
801 -- Get_Next_Line --
802 -------------------
803
804 procedure Get_Next_Line is
805 Fchars : chars;
806
807 begin
808 Fchars := fgets (Next_Line'Address, Next_Line'Length, Fd);
809
810 if Fchars = System.Null_Address then
811 Exit_With_Error ("Error reading binder output");
812 end if;
813
814 Nfirst := Next_Line'First;
815 Nlast := Nfirst;
816 while Nlast <= Next_Line'Last
817 and then Next_Line (Nlast) /= ASCII.LF
818 and then Next_Line (Nlast) /= ASCII.CR
819 loop
820 Nlast := Nlast + 1;
821 end loop;
822
823 Nlast := Nlast - 1;
824 end Get_Next_Line;
825
826 -----------
827 -- Index --
828 -----------
829
830 function Index (S, Pattern : String) return Natural is
831 Len : constant Natural := Pattern'Length;
832
833 begin
834 for J in reverse S'First .. S'Last - Len + 1 loop
835 if Pattern = S (J .. J + Len - 1) then
836 return J;
837 end if;
838 end loop;
839
840 return 0;
841 end Index;
842
843 ---------------------------
844 -- Rollback_File_Context --
845 ---------------------------
846
847 procedure Rollback_File_Context is
848 begin
849 Next_Line := RB_Next_Line;
850 Nfirst := RB_Nfirst;
851 Nlast := RB_Nlast;
852 Status := fseek (Fd, RB_File_Pos, Interfaces.C_Streams.SEEK_SET);
853
854 if Status = -1 then
855 Exit_With_Error ("Error setting file position");
856 end if;
857 end Rollback_File_Context;
858
859 ------------------------
860 -- Store_File_Context --
861 ------------------------
862
863 procedure Store_File_Context is
864 use type System.CRTL.long;
865
866 begin
867 RB_Next_Line := Next_Line;
868 RB_Nfirst := Nfirst;
869 RB_Nlast := Nlast;
870 RB_File_Pos := ftell (Fd);
871
872 if RB_File_Pos = -1 then
873 Exit_With_Error ("Error getting file position");
874 end if;
875 end Store_File_Context;
876
877 --------------
878 -- Write_RF --
879 --------------
880
881 procedure Write_RF (S : String) is
882 Success : Boolean := True;
883 Back_Slash : constant Character := '\';
884
885 begin
886 -- If a GNU response file is used, space and backslash need to be
887 -- escaped because they are interpreted as a string separator and
888 -- an escape character respectively by the underlying mechanism.
889 -- On the other hand, quote and double-quote are not escaped since
890 -- they are interpreted as string delimiters on both sides.
891
892 if Using_GNU_response_file then
893 for J in S'Range loop
894 if S (J) = ' ' or else S (J) = '\' then
895 if Write (Tname_FD, Back_Slash'Address, 1) /= 1 then
896 Success := False;
897 end if;
898 end if;
899
900 if Write (Tname_FD, S (J)'Address, 1) /= 1 then
901 Success := False;
902 end if;
903 end loop;
904
905 else
906 if Write (Tname_FD, S'Address, S'Length) /= S'Length then
907 Success := False;
908 end if;
909 end if;
910
911 if Write (Tname_FD, ASCII.LF'Address, 1) /= 1 then
912 Success := False;
913 end if;
914
915 if not Success then
916 Exit_With_Error ("Error generating response file: disk full");
917 end if;
918 end Write_RF;
919
920 -- Start of processing for Process_Binder_File
921
922 begin
923 Fd := fopen (Name'Address, Read_Mode'Address);
924
925 if Fd = NULL_Stream then
926 Exit_With_Error ("Failed to open binder output");
927 end if;
928
929 -- Skip up to the Begin Info line
930
931 loop
932 Get_Next_Line;
933 exit when Next_Line (Nfirst .. Nlast) = Begin_Info;
934 end loop;
935
936 loop
937 Get_Next_Line;
938
939 -- Go to end when end line is reached (this will happen in
940 -- High_Integrity_Mode where no -L switches are generated)
941
942 exit when Next_Line (Nfirst .. Nlast) = End_Info;
943
944 Next_Line (Nfirst .. Nlast - 8) := Next_Line (Nfirst + 8 .. Nlast);
945 Nlast := Nlast - 8;
946
947 -- Go to next section when switches are reached
948
949 exit when Next_Line (1) = '-';
950
951 -- Otherwise we have another object file to collect
952
953 Linker_Objects.Increment_Last;
954
955 -- Mark the positions of first and last object files in case they
956 -- need to be placed with a named file on systems having linker
957 -- line limitations.
958
959 if Objs_Begin = 0 then
960 Objs_Begin := Linker_Objects.Last;
961 end if;
962
963 Linker_Objects.Table (Linker_Objects.Last) :=
964 new String'(Next_Line (Nfirst .. Nlast));
965
966 -- Nlast - Nfirst + 1, for the size, plus one for the space between
967 -- each arguments.
968
969 Link_Bytes := Link_Bytes + Nlast - Nfirst + 2;
970 end loop;
971
972 Objs_End := Linker_Objects.Last;
973
974 -- Continue to compute the Link_Bytes, the linker options are part of
975 -- command line length.
976
977 Store_File_Context;
978
979 while Next_Line (Nfirst .. Nlast) /= End_Info loop
980 Link_Bytes := Link_Bytes + Nlast - Nfirst + 2;
981 Get_Next_Line;
982 end loop;
983
984 Rollback_File_Context;
985
986 -- On systems that have limitations on handling very long linker lines
987 -- we make use of the system linker option which takes a list of object
988 -- file names from a file instead of the command line itself. What we do
989 -- is to replace the list of object files by the special linker option
990 -- which then reads the object file list from a file instead. The option
991 -- to read from a file instead of the command line is only triggered if
992 -- a conservative threshold is passed.
993
994 if Object_List_File_Required
995 or else (Object_List_File_Supported
996 and then Link_Bytes > Link_Max)
997 then
998 -- Create a temporary file containing the Ada user object files
999 -- needed by the link. This list is taken from the bind file and is
1000 -- output one object per line for maximal compatibility with linkers
1001 -- supporting this option.
1002
1003 Create_Temp_File (Tname_FD, Tname);
1004
1005 -- ??? File descriptor should be checked to not be Invalid_FD.
1006 -- ??? Status of Write and Close operations should be checked, and
1007 -- failure should occur if a status is wrong.
1008
1009 for J in Objs_Begin .. Objs_End loop
1010 Write_RF (Linker_Objects.Table (J).all);
1011
1012 Response_File_Objects.Increment_Last;
1013 Response_File_Objects.Table (Response_File_Objects.Last) :=
1014 Linker_Objects.Table (J);
1015 end loop;
1016
1017 Close (Tname_FD, Closing_Status);
1018
1019 -- Add the special objects list file option together with the name
1020 -- of the temporary file (removing the null character) to the objects
1021 -- file table.
1022
1023 Linker_Objects.Table (Objs_Begin) :=
1024 new String'(Object_File_Option &
1025 Tname (Tname'First .. Tname'Last - 1));
1026
1027 -- The slots containing these object file names are then removed
1028 -- from the objects table so they do not appear in the link. They are
1029 -- removed by moving up the linker options and non-Ada object files
1030 -- appearing after the Ada object list in the table.
1031
1032 declare
1033 N : Integer;
1034
1035 begin
1036 N := Objs_End - Objs_Begin + 1;
1037
1038 for J in Objs_End + 1 .. Linker_Objects.Last loop
1039 Linker_Objects.Table (J - N + 1) := Linker_Objects.Table (J);
1040 end loop;
1041
1042 Linker_Objects.Set_Last (Linker_Objects.Last - N + 1);
1043 end;
1044 end if;
1045
1046 -- Process switches and options
1047
1048 if Next_Line (Nfirst .. Nlast) /= End_Info then
1049 Xlinker_Was_Previous := False;
1050
1051 loop
1052 if Xlinker_Was_Previous
1053 or else Next_Line (Nfirst .. Nlast) = "-Xlinker"
1054 then
1055 Linker_Options.Increment_Last;
1056 Linker_Options.Table (Linker_Options.Last) :=
1057 new String'(Next_Line (Nfirst .. Nlast));
1058
1059 elsif Next_Line (Nfirst .. Nlast) = "-static" then
1060 GNAT_Static := True;
1061
1062 elsif Next_Line (Nfirst .. Nlast) = "-shared" then
1063 GNAT_Shared := True;
1064
1065 -- Add binder options only if not already set on the command line.
1066 -- This rule is a way to control the linker options order.
1067
1068 else
1069 if Nlast > Nfirst + 2 and then
1070 Next_Line (Nfirst .. Nfirst + 1) = "-L"
1071 then
1072 -- Construct a library search path for use later to locate
1073 -- static gnatlib libraries.
1074
1075 if Libpath.Last > 1 then
1076 Libpath.Increment_Last;
1077 Libpath.Table (Libpath.Last) := Path_Separator;
1078 end if;
1079
1080 for I in Nfirst + 2 .. Nlast loop
1081 Libpath.Increment_Last;
1082 Libpath.Table (Libpath.Last) := Next_Line (I);
1083 end loop;
1084
1085 Linker_Options.Increment_Last;
1086
1087 Linker_Options.Table (Linker_Options.Last) :=
1088 new String'(Next_Line (Nfirst .. Nlast));
1089
1090 elsif Next_Line (Nfirst .. Nlast) = "-lgnarl"
1091 or else Next_Line (Nfirst .. Nlast) = "-lgnat"
1092 or else
1093 Next_Line
1094 (1 .. Natural'Min (Nlast, 8 + Library_Version'Length)) =
1095 Shared_Lib ("gnarl")
1096 or else
1097 Next_Line
1098 (1 .. Natural'Min (Nlast, 7 + Library_Version'Length)) =
1099 Shared_Lib ("gnat")
1100 then
1101 -- If it is a shared library, remove the library version.
1102 -- We will be looking for the static version of the library
1103 -- as it is in the same directory as the shared version.
1104
1105 if Nlast >= Library_Version'Length
1106 and then
1107 Next_Line (Nlast - Library_Version'Length + 1 .. Nlast) =
1108 Library_Version
1109 then
1110 -- Set Last to point to last character before the
1111 -- library version.
1112
1113 Last := Nlast - Library_Version'Length - 1;
1114 else
1115 Last := Nlast;
1116 end if;
1117
1118 -- Given a Gnat standard library, search the library path to
1119 -- find the library location.
1120
1121 -- Shouldn't we abstract a proc here, we are getting awfully
1122 -- heavily nested ???
1123
1124 declare
1125 File_Path : String_Access;
1126
1127 Object_Lib_Extension : constant String :=
1128 Value (Object_Library_Ext_Ptr);
1129
1130 File_Name : constant String := "lib" &
1131 Next_Line (Nfirst + 2 .. Last) & Object_Lib_Extension;
1132
1133 Run_Path_Opt : constant String :=
1134 Value (Run_Path_Option_Ptr);
1135
1136 GCC_Index : Natural;
1137 Run_Path_Opt_Index : Natural := 0;
1138
1139 begin
1140 File_Path :=
1141 Locate_Regular_File (File_Name,
1142 String (Libpath.Table (1 .. Libpath.Last)));
1143
1144 if File_Path /= null then
1145 if GNAT_Static then
1146
1147 -- If static gnatlib found, explicitly specify to
1148 -- overcome possible linker default usage of shared
1149 -- version.
1150
1151 Linker_Options.Increment_Last;
1152
1153 Linker_Options.Table (Linker_Options.Last) :=
1154 new String'(File_Path.all);
1155
1156 elsif GNAT_Shared then
1157 if Opt.Run_Path_Option then
1158
1159 -- If shared gnatlib desired, add appropriate
1160 -- system specific switch so that it can be
1161 -- located at runtime.
1162
1163 if Run_Path_Opt'Length /= 0 then
1164
1165 -- Output the system specific linker command
1166 -- that allows the image activator to find
1167 -- the shared library at runtime. Also add
1168 -- path to find libgcc_s.so, if relevant.
1169
1170 declare
1171 Path : String (1 .. File_Path'Length + 15);
1172
1173 Path_Last : constant Natural :=
1174 File_Path'Length;
1175
1176 begin
1177 Path (1 .. File_Path'Length) :=
1178 File_Path.all;
1179
1180 -- To find the location of the shared version
1181 -- of libgcc, we look for "gcc-lib" in the
1182 -- path of the library. However, this
1183 -- subdirectory is no longer present in
1184 -- recent versions of GCC. So, we look for
1185 -- the last subdirectory "lib" in the path.
1186
1187 GCC_Index :=
1188 Index (Path (1 .. Path_Last), "gcc-lib");
1189
1190 if GCC_Index /= 0 then
1191
1192 -- The shared version of libgcc is
1193 -- located in the parent directory.
1194
1195 GCC_Index := GCC_Index - 1;
1196
1197 else
1198 GCC_Index :=
1199 Index
1200 (Path (1 .. Path_Last),
1201 "/lib/");
1202
1203 if GCC_Index = 0 then
1204 GCC_Index :=
1205 Index (Path (1 .. Path_Last),
1206 Directory_Separator & "lib"
1207 & Directory_Separator);
1208 end if;
1209
1210 -- If we have found a "lib" subdir in
1211 -- the path to libgnat, the possible
1212 -- shared libgcc of interest by default
1213 -- is in libgcc_subdir at the same
1214 -- level.
1215
1216 if GCC_Index /= 0 then
1217 declare
1218 Subdir : constant String :=
1219 Value (Libgcc_Subdir_Ptr);
1220 begin
1221 Path
1222 (GCC_Index + 1 ..
1223 GCC_Index + Subdir'Length) :=
1224 Subdir;
1225 GCC_Index :=
1226 GCC_Index + Subdir'Length;
1227 end;
1228 end if;
1229 end if;
1230
1231 -- Look for an eventual run_path_option in
1232 -- the linker switches.
1233
1234 if Separate_Run_Path_Options then
1235 Linker_Options.Increment_Last;
1236 Linker_Options.Table
1237 (Linker_Options.Last) :=
1238 new String'
1239 (Run_Path_Opt
1240 & File_Path
1241 (1 .. File_Path'Length
1242 - File_Name'Length));
1243
1244 if GCC_Index /= 0 then
1245 Linker_Options.Increment_Last;
1246 Linker_Options.Table
1247 (Linker_Options.Last) :=
1248 new String'
1249 (Run_Path_Opt
1250 & Path (1 .. GCC_Index));
1251 end if;
1252
1253 else
1254 for J in reverse
1255 1 .. Linker_Options.Last
1256 loop
1257 if Linker_Options.Table (J) /= null
1258 and then
1259 Linker_Options.Table (J)'Length
1260 > Run_Path_Opt'Length
1261 and then
1262 Linker_Options.Table (J)
1263 (1 .. Run_Path_Opt'Length) =
1264 Run_Path_Opt
1265 then
1266 -- We have found an already
1267 -- specified run_path_option:
1268 -- we will add to this
1269 -- switch, because only one
1270 -- run_path_option should be
1271 -- specified.
1272
1273 Run_Path_Opt_Index := J;
1274 exit;
1275 end if;
1276 end loop;
1277
1278 -- If there is no run_path_option, we
1279 -- need to add one.
1280
1281 if Run_Path_Opt_Index = 0 then
1282 Linker_Options.Increment_Last;
1283 end if;
1284
1285 if GCC_Index = 0 then
1286 if Run_Path_Opt_Index = 0 then
1287 Linker_Options.Table
1288 (Linker_Options.Last) :=
1289 new String'
1290 (Run_Path_Opt
1291 & File_Path
1292 (1 .. File_Path'Length
1293 - File_Name'Length));
1294
1295 else
1296 Linker_Options.Table
1297 (Run_Path_Opt_Index) :=
1298 new String'
1299 (Linker_Options.Table
1300 (Run_Path_Opt_Index).all
1301 & Path_Separator
1302 & File_Path
1303 (1 .. File_Path'Length
1304 - File_Name'Length));
1305 end if;
1306
1307 else
1308 if Run_Path_Opt_Index = 0 then
1309 Linker_Options.Table
1310 (Linker_Options.Last) :=
1311 new String'
1312 (Run_Path_Opt
1313 & File_Path
1314 (1 .. File_Path'Length
1315 - File_Name'Length)
1316 & Path_Separator
1317 & Path (1 .. GCC_Index));
1318
1319 else
1320 Linker_Options.Table
1321 (Run_Path_Opt_Index) :=
1322 new String'
1323 (Linker_Options.Table
1324 (Run_Path_Opt_Index).all
1325 & Path_Separator
1326 & File_Path
1327 (1 .. File_Path'Length
1328 - File_Name'Length)
1329 & Path_Separator
1330 & Path (1 .. GCC_Index));
1331 end if;
1332 end if;
1333 end if;
1334 end;
1335 end if;
1336 end if;
1337
1338 -- Then we add the appropriate -l switch
1339
1340 Linker_Options.Increment_Last;
1341 Linker_Options.Table (Linker_Options.Last) :=
1342 new String'(Next_Line (Nfirst .. Nlast));
1343 end if;
1344
1345 else
1346 -- If gnatlib library not found, then add it anyway in
1347 -- case some other mechanism may find it.
1348
1349 Linker_Options.Increment_Last;
1350 Linker_Options.Table (Linker_Options.Last) :=
1351 new String'(Next_Line (Nfirst .. Nlast));
1352 end if;
1353 end;
1354 else
1355 Linker_Options.Increment_Last;
1356 Linker_Options.Table (Linker_Options.Last) :=
1357 new String'(Next_Line (Nfirst .. Nlast));
1358 end if;
1359 end if;
1360
1361 Xlinker_Was_Previous := Next_Line (Nfirst .. Nlast) = "-Xlinker";
1362
1363 Get_Next_Line;
1364 exit when Next_Line (Nfirst .. Nlast) = End_Info;
1365
1366 Next_Line (Nfirst .. Nlast - 8) := Next_Line (Nfirst + 8 .. Nlast);
1367 Nlast := Nlast - 8;
1368 end loop;
1369 end if;
1370
1371 -- If -shared was specified, invoke gcc with -shared-libgcc
1372
1373 if GNAT_Shared then
1374 Linker_Options.Increment_Last;
1375 Linker_Options.Table (Linker_Options.Last) := Shared_Libgcc;
1376 end if;
1377
1378 Status := fclose (Fd);
1379 end Process_Binder_File;
1380
1381 -----------
1382 -- Usage --
1383 -----------
1384
1385 procedure Usage is
1386 begin
1387 Write_Str ("Usage: ");
1388 Write_Str (Base_Command_Name.all);
1389 Write_Str (" switches mainprog.ali [non-Ada-objects] [linker-options]");
1390 Write_Eol;
1391 Write_Eol;
1392 Write_Line (" mainprog.ali the ALI file of the main program");
1393 Write_Eol;
1394 Write_Eol;
1395 Display_Usage_Version_And_Help;
1396 Write_Line (" -f Force object file list to be generated");
1397 Write_Line (" -g Compile binder source file with debug information");
1398 Write_Line (" -n Do not compile the binder source file");
1399 Write_Line (" -P Process files for use by CodePeer");
1400 Write_Line (" -R Do not use a run_path_option");
1401 Write_Line (" -v Verbose mode");
1402 Write_Line (" -v -v Very verbose mode");
1403 Write_Eol;
1404 Write_Line (" -o nam Use 'nam' as the name of the executable");
1405 Write_Line (" -Bdir Load compiler executables from dir");
1406
1407 if Is_Supported (Map_File) then
1408 Write_Line (" -Mmap Create map file map");
1409 Write_Line (" -M Create map file mainprog.map");
1410 end if;
1411
1412 Write_Line (" --GCC=comp Use 'comp' as the compiler rather than 'gcc'");
1413 Write_Line (" --LINK=lnk Use 'lnk' as the linker rather than 'gcc'");
1414 Write_Eol;
1415 Write_Line (" [non-Ada-objects] list of non Ada object files");
1416 Write_Line (" [linker-options] other options for the linker");
1417 end Usage;
1418
1419 ------------------
1420 -- Write_Header --
1421 ------------------
1422
1423 procedure Write_Header is
1424 begin
1425 if Verbose_Mode then
1426 Write_Eol;
1427 Display_Version ("GNATLINK", "1995");
1428 end if;
1429 end Write_Header;
1430
1431 -----------------
1432 -- Write_Usage --
1433 -----------------
1434
1435 procedure Write_Usage is
1436 begin
1437 Write_Header;
1438 Usage;
1439 end Write_Usage;
1440
1441 -- Start of processing for Gnatlink
1442
1443 begin
1444 -- Add the directory where gnatlink is invoked in front of the path, if
1445 -- gnatlink is invoked with directory information.
1446
1447 declare
1448 Command : constant String := Command_Name;
1449 begin
1450 for Index in reverse Command'Range loop
1451 if Command (Index) = Directory_Separator then
1452 declare
1453 Absolute_Dir : constant String :=
1454 Normalize_Pathname
1455 (Command (Command'First .. Index));
1456
1457 PATH : constant String :=
1458 Absolute_Dir &
1459 Path_Separator &
1460 Getenv ("PATH").all;
1461
1462 begin
1463 Setenv ("PATH", PATH);
1464 end;
1465
1466 exit;
1467 end if;
1468 end loop;
1469 end;
1470
1471 Base_Command_Name := new String'(Base_Name (Command_Name));
1472 Process_Args;
1473
1474 if Argument_Count = 0
1475 or else (Verbose_Mode and then Argument_Count = 1)
1476 then
1477 Write_Usage;
1478 Exit_Program (E_Fatal);
1479 end if;
1480
1481 -- Initialize packages to be used
1482
1483 Csets.Initialize;
1484 Snames.Initialize;
1485
1486 -- We always compile with -c
1487
1488 Binder_Options_From_ALI.Increment_Last;
1489 Binder_Options_From_ALI.Table (Binder_Options_From_ALI.Last) :=
1490 new String'("-c");
1491
1492 if Ali_File_Name = null then
1493 Exit_With_Error ("no ali file given for link");
1494 end if;
1495
1496 if not Is_Regular_File (Ali_File_Name.all) then
1497 Exit_With_Error (Ali_File_Name.all & " not found");
1498 end if;
1499
1500 -- Read the ALI file of the main subprogram if the binder generated file
1501 -- needs to be compiled and no --GCC= switch has been specified. Fetch the
1502 -- back end switches from this ALI file and use these switches to compile
1503 -- the binder generated file
1504
1505 if Compile_Bind_File and then Standard_Gcc then
1506 Initialize_ALI;
1507 Name_Len := Ali_File_Name'Length;
1508 Name_Buffer (1 .. Name_Len) := Ali_File_Name.all;
1509
1510 declare
1511 use Types;
1512 F : constant File_Name_Type := Name_Find;
1513 T : Text_Buffer_Ptr;
1514 A : ALI_Id;
1515
1516 begin
1517 -- Load the ALI file
1518
1519 T := Read_Library_Info (F, True);
1520
1521 -- Read it. Note that we ignore errors, since we only want very
1522 -- limited information from the ali file, and likely a slightly
1523 -- wrong version will be just fine, though in normal operation
1524 -- we don't expect this to happen.
1525
1526 A := Scan_ALI
1527 (F,
1528 T,
1529 Ignore_ED => False,
1530 Err => False,
1531 Ignore_Errors => True);
1532
1533 if A /= No_ALI_Id then
1534 for
1535 Index in Units.Table (ALIs.Table (A).First_Unit).First_Arg ..
1536 Units.Table (ALIs.Table (A).First_Unit).Last_Arg
1537 loop
1538 -- Do not compile with the front end switches. However, --RTS
1539 -- is to be dealt with specially because it needs to be passed
1540 -- to compile the file generated by the binder.
1541
1542 declare
1543 Arg : String_Ptr renames Args.Table (Index);
1544 begin
1545 if not Is_Front_End_Switch (Arg.all) then
1546 Binder_Options_From_ALI.Increment_Last;
1547 Binder_Options_From_ALI.Table
1548 (Binder_Options_From_ALI.Last) := String_Access (Arg);
1549
1550 -- GNAT doesn't support GCC's multilib mechanism when it
1551 -- is configured with --disable-libada. This means that,
1552 -- when a multilib switch is used to request a particular
1553 -- compilation mode, the corresponding --RTS switch must
1554 -- also be specified. It is convenient to eliminate the
1555 -- redundancy by keying the compilation mode on a single
1556 -- switch, namely --RTS, and have the compiler reinstate
1557 -- the multilib switch (see gcc-interface/lang-specs.h).
1558 -- This switch must be passed to the driver at link time.
1559
1560 if Arg'Length = 5
1561 and then Arg (Arg'First + 1 .. Arg'First + 4) = "mrtp"
1562 then
1563 Linker_Options.Increment_Last;
1564 Linker_Options.Table
1565 (Linker_Options.Last) := String_Access (Arg);
1566 end if;
1567
1568 elsif Arg'Length > 5
1569 and then Arg (Arg'First + 2 .. Arg'First + 5) = "RTS="
1570 then
1571 Binder_Options_From_ALI.Increment_Last;
1572 Binder_Options_From_ALI.Table
1573 (Binder_Options_From_ALI.Last) := String_Access (Arg);
1574
1575 -- Set the RTS_*_Path_Name variables, so that
1576 -- the correct directories will be set when
1577 -- Osint.Add_Default_Search_Dirs will be called later.
1578
1579 Opt.RTS_Src_Path_Name :=
1580 Get_RTS_Search_Dir
1581 (Arg (Arg'First + 6 .. Arg'Last), Include);
1582
1583 Opt.RTS_Lib_Path_Name :=
1584 Get_RTS_Search_Dir
1585 (Arg (Arg'First + 6 .. Arg'Last), Objects);
1586 end if;
1587 end;
1588 end loop;
1589 end if;
1590 end;
1591 end if;
1592
1593 -- Get target parameters
1594
1595 Osint.Add_Default_Search_Dirs;
1596 Targparm.Get_Target_Parameters;
1597
1598 -- Compile the bind file with the following switches:
1599
1600 -- -gnatA stops reading gnat.adc, since we don't know what
1601 -- pragmas would work, and we do not need it anyway.
1602
1603 -- -gnatWb allows brackets coding for wide characters
1604
1605 -- -gnatiw allows wide characters in identifiers. This is needed
1606 -- because bindgen uses brackets encoding for all upper
1607 -- half and wide characters in identifier names.
1608
1609 -- In addition, in CodePeer mode compile with -x adascil -gnatcC
1610
1611 Binder_Options_From_ALI.Increment_Last;
1612 Binder_Options_From_ALI.Table (Binder_Options_From_ALI.Last) :=
1613 new String'("-gnatA");
1614 Binder_Options_From_ALI.Increment_Last;
1615 Binder_Options_From_ALI.Table (Binder_Options_From_ALI.Last) :=
1616 new String'("-gnatWb");
1617 Binder_Options_From_ALI.Increment_Last;
1618 Binder_Options_From_ALI.Table (Binder_Options_From_ALI.Last) :=
1619 new String'("-gnatiw");
1620
1621 if Opt.CodePeer_Mode then
1622 Binder_Options_From_ALI.Increment_Last;
1623 Binder_Options_From_ALI.Table (Binder_Options_From_ALI.Last) :=
1624 new String'("-x");
1625 Binder_Options_From_ALI.Increment_Last;
1626 Binder_Options_From_ALI.Table (Binder_Options_From_ALI.Last) :=
1627 new String'("adascil");
1628 Binder_Options_From_ALI.Increment_Last;
1629 Binder_Options_From_ALI.Table (Binder_Options_From_ALI.Last) :=
1630 new String'("-gnatcC");
1631 end if;
1632
1633 -- Locate all the necessary programs and verify required files are present
1634
1635 Gcc_Path := System.OS_Lib.Locate_Exec_On_Path (Gcc.all);
1636
1637 if Gcc_Path = null then
1638 Exit_With_Error ("Couldn't locate " & Gcc.all);
1639 end if;
1640
1641 if Linker_Path = null then
1642 Linker_Path := Gcc_Path;
1643 end if;
1644
1645 Write_Header;
1646
1647 Target_Debuggable_Suffix := Get_Target_Debuggable_Suffix;
1648
1649 -- If no output name specified, then use the base name of .ali file name
1650
1651 if Output_File_Name = null then
1652 Output_File_Name :=
1653 new String'(Base_Name (Ali_File_Name.all)
1654 & Target_Debuggable_Suffix.all);
1655 end if;
1656
1657 Linker_Options.Increment_Last;
1658 Linker_Options.Table (Linker_Options.Last) := new String'("-o");
1659
1660 Linker_Options.Increment_Last;
1661 Linker_Options.Table (Linker_Options.Last) :=
1662 new String'(Output_File_Name.all);
1663
1664 Check_Existing_Executable (Output_File_Name.all);
1665
1666 -- Warn if main program is called "test", as that may be a built-in command
1667 -- on Unix. On non-Unix systems executables have a suffix, so the warning
1668 -- will not appear. However, do not warn in the case of a cross compiler.
1669
1670 -- Assume this is a cross tool if the executable name is not gnatlink.
1671 -- Note that the executable name is also gnatlink on windows, but in that
1672 -- case the output file name will be test.exe rather than test.
1673
1674 if Base_Command_Name.all = "gnatlink"
1675 and then Output_File_Name.all = "test"
1676 then
1677 Error_Msg ("warning: executable name """ & Output_File_Name.all
1678 & """ may conflict with shell command");
1679 end if;
1680
1681 -- Special warnings for worrisome file names on windows
1682
1683 -- Recent versions of Windows by default cause privilege escalation if an
1684 -- executable file name contains substrings "install", "setup", "update"
1685 -- or "patch". A console application will typically fail to load as a
1686 -- result, so we should warn the user.
1687
1688 Bad_File_Names_On_Windows : declare
1689 FN : String := Output_File_Name.all;
1690
1691 procedure Check_File_Name (S : String);
1692 -- Warn if file name has the substring S
1693
1694 procedure Check_File_Name (S : String) is
1695 begin
1696 for J in 1 .. FN'Length - (S'Length - 1) loop
1697 if FN (J .. J + (S'Length - 1)) = S then
1698 Error_Msg
1699 ("warning: executable file name """ & Output_File_Name.all
1700 & """ contains substring """ & S & '"');
1701 Error_Msg
1702 ("admin privileges may be required to run this file");
1703 end if;
1704 end loop;
1705 end Check_File_Name;
1706
1707 -- Start of processing for Bad_File_Names_On_Windows
1708
1709 begin
1710 for J in FN'Range loop
1711 FN (J) := Csets.Fold_Lower (FN (J));
1712 end loop;
1713
1714 -- For now we detect Windows by its executable suffix of .exe
1715
1716 if Target_Debuggable_Suffix.all = ".exe" then
1717 Check_File_Name ("install");
1718 Check_File_Name ("setup");
1719 Check_File_Name ("update");
1720 Check_File_Name ("patch");
1721 end if;
1722 end Bad_File_Names_On_Windows;
1723
1724 -- If -M switch was specified, add the switches to create the map file
1725
1726 if Create_Map_File then
1727 declare
1728 Map_Name : constant String := Base_Name (Ali_File_Name.all) & ".map";
1729 Switches : String_List_Access;
1730
1731 begin
1732 Convert (Map_File, Map_Name, Switches);
1733
1734 if Switches /= null then
1735 for J in Switches'Range loop
1736 Linker_Options.Increment_Last;
1737 Linker_Options.Table (Linker_Options.Last) := Switches (J);
1738 end loop;
1739 end if;
1740 end;
1741 end if;
1742
1743 -- Perform consistency checks
1744
1745 -- Transform the .ali file name into the binder output file name
1746
1747 Make_Binder_File_Names : declare
1748 Fname : constant String := Base_Name (Ali_File_Name.all);
1749 Fname_Len : Integer := Fname'Length;
1750
1751 function Get_Maximum_File_Name_Length return Integer;
1752 pragma Import (C, Get_Maximum_File_Name_Length,
1753 "__gnat_get_maximum_file_name_length");
1754
1755 Maximum_File_Name_Length : constant Integer :=
1756 Get_Maximum_File_Name_Length;
1757
1758 Bind_File_Prefix : Types.String_Ptr;
1759 -- Contains prefix used for bind files
1760
1761 begin
1762 -- Set prefix
1763
1764 Bind_File_Prefix := new String'("b~");
1765
1766 -- If the length of the binder file becomes too long due to
1767 -- the addition of the "b?" prefix, then truncate it.
1768
1769 if Maximum_File_Name_Length > 0 then
1770 while Fname_Len >
1771 Maximum_File_Name_Length - Bind_File_Prefix.all'Length
1772 loop
1773 Fname_Len := Fname_Len - 1;
1774 end loop;
1775 end if;
1776
1777 declare
1778 Fnam : constant String :=
1779 Bind_File_Prefix.all &
1780 Fname (Fname'First .. Fname'First + Fname_Len - 1);
1781
1782 begin
1783 Binder_Spec_Src_File := new String'(Fnam & ".ads");
1784 Binder_Body_Src_File := new String'(Fnam & ".adb");
1785 Binder_Ali_File := new String'(Fnam & ".ali");
1786
1787 Binder_Obj_File := new String'(Fnam & Get_Target_Object_Suffix.all);
1788 end;
1789
1790 if Fname_Len /= Fname'Length then
1791 Binder_Options.Increment_Last;
1792 Binder_Options.Table (Binder_Options.Last) := new String'("-o");
1793 Binder_Options.Increment_Last;
1794 Binder_Options.Table (Binder_Options.Last) := Binder_Obj_File;
1795 end if;
1796 end Make_Binder_File_Names;
1797
1798 Process_Binder_File (Binder_Body_Src_File.all & ASCII.NUL);
1799
1800 -- Compile the binder file. This is fast, so we always do it, unless
1801 -- specifically told not to by the -n switch
1802
1803 if Compile_Bind_File then
1804 Bind_Step : declare
1805 Success : Boolean;
1806
1807 Args : Argument_List
1808 (1 .. Binder_Options_From_ALI.Last + Binder_Options.Last + 1);
1809
1810 begin
1811 for J in 1 .. Binder_Options_From_ALI.Last loop
1812 Args (J) := Binder_Options_From_ALI.Table (J);
1813 end loop;
1814
1815 for J in 1 .. Binder_Options.Last loop
1816 Args (Binder_Options_From_ALI.Last + J) :=
1817 Binder_Options.Table (J);
1818 end loop;
1819
1820 -- Use the full path of the binder generated source, so that it is
1821 -- guaranteed that the debugger will find this source, even with
1822 -- STABS.
1823
1824 Args (Args'Last) :=
1825 new String'(Normalize_Pathname (Binder_Body_Src_File.all));
1826
1827 if Verbose_Mode then
1828 Write_Str (Base_Name (Gcc_Path.all));
1829
1830 for J in Args'Range loop
1831 Write_Str (" ");
1832 Write_Str (Args (J).all);
1833 end loop;
1834
1835 Write_Eol;
1836 end if;
1837
1838 System.OS_Lib.Spawn (Gcc_Path.all, Args, Success);
1839
1840 if not Success then
1841 Exit_Program (E_Fatal);
1842 end if;
1843 end Bind_Step;
1844 end if;
1845
1846 -- In CodePeer mode, there's nothing left to do after the binder file has
1847 -- been compiled.
1848
1849 if Opt.CodePeer_Mode then
1850 if Tname_FD /= Invalid_FD then
1851 Delete (Tname);
1852 end if;
1853
1854 return;
1855 end if;
1856
1857 -- Now, actually link the program
1858
1859 Link_Step : declare
1860 Num_Args : Natural :=
1861 (Linker_Options.Last - Linker_Options.First + 1) +
1862 (Gcc_Linker_Options.Last - Gcc_Linker_Options.First + 1) +
1863 (Linker_Objects.Last - Linker_Objects.First + 1);
1864 Stack_Op : Boolean := False;
1865
1866 begin
1867 -- Remove duplicate stack size setting from the Linker_Options table.
1868 -- The stack setting option "-Xlinker --stack=R,C" can be found
1869 -- in one line when set by a pragma Linker_Options or in two lines
1870 -- ("-Xlinker" then "--stack=R,C") when set on the command line. We
1871 -- also check for the "-Wl,--stack=R" style option.
1872
1873 -- We must remove the second stack setting option instance because
1874 -- the one on the command line will always be the first one. And any
1875 -- subsequent stack setting option will overwrite the previous one.
1876 -- This is done especially for GNAT/NT where we set the stack size
1877 -- for tasking programs by a pragma in the NT specific tasking
1878 -- package System.Task_Primitives.Operations.
1879
1880 -- Note: This is not a FOR loop that runs from Linker_Options.First
1881 -- to Linker_Options.Last, since operations within the loop can
1882 -- modify the length of the table.
1883
1884 Clean_Link_Option_Set : declare
1885 J : Natural;
1886 Shared_Libgcc_Seen : Boolean := False;
1887
1888 begin
1889 J := Linker_Options.First;
1890 while J <= Linker_Options.Last loop
1891 if Linker_Options.Table (J).all = "-Xlinker"
1892 and then J < Linker_Options.Last
1893 and then Linker_Options.Table (J + 1)'Length > 8
1894 and then Linker_Options.Table (J + 1) (1 .. 8) = "--stack="
1895 then
1896 if Stack_Op then
1897 Linker_Options.Table (J .. Linker_Options.Last - 2) :=
1898 Linker_Options.Table (J + 2 .. Linker_Options.Last);
1899 Linker_Options.Decrement_Last;
1900 Linker_Options.Decrement_Last;
1901 Num_Args := Num_Args - 2;
1902
1903 else
1904 Stack_Op := True;
1905 end if;
1906 end if;
1907
1908 -- Remove duplicate -shared-libgcc switch
1909
1910 if Linker_Options.Table (J).all = Shared_Libgcc_String then
1911 if Shared_Libgcc_Seen then
1912 Linker_Options.Table (J .. Linker_Options.Last - 1) :=
1913 Linker_Options.Table (J + 1 .. Linker_Options.Last);
1914 Linker_Options.Decrement_Last;
1915 Num_Args := Num_Args - 1;
1916
1917 else
1918 Shared_Libgcc_Seen := True;
1919 end if;
1920 end if;
1921
1922 -- Here we just check for a canonical form that matches the
1923 -- pragma Linker_Options set in the NT runtime.
1924
1925 if (Linker_Options.Table (J)'Length > 17
1926 and then Linker_Options.Table (J) (1 .. 17) =
1927 "-Xlinker --stack=")
1928 or else
1929 (Linker_Options.Table (J)'Length > 12
1930 and then Linker_Options.Table (J) (1 .. 12) =
1931 "-Wl,--stack=")
1932 then
1933 if Stack_Op then
1934 Linker_Options.Table (J .. Linker_Options.Last - 1) :=
1935 Linker_Options.Table (J + 1 .. Linker_Options.Last);
1936 Linker_Options.Decrement_Last;
1937 Num_Args := Num_Args - 1;
1938
1939 else
1940 Stack_Op := True;
1941 end if;
1942 end if;
1943
1944 J := J + 1;
1945 end loop;
1946
1947 if Linker_Path = Gcc_Path then
1948
1949 -- For systems where the default is to link statically with
1950 -- libgcc, if gcc is not called with -shared-libgcc, call it
1951 -- with -static-libgcc, as there are some platforms where one
1952 -- of these two switches is compulsory to link.
1953
1954 if Shared_Libgcc_Default = 'T'
1955 and then not Shared_Libgcc_Seen
1956 then
1957 Linker_Options.Increment_Last;
1958 Linker_Options.Table (Linker_Options.Last) := Static_Libgcc;
1959 Num_Args := Num_Args + 1;
1960 end if;
1961 end if;
1962 end Clean_Link_Option_Set;
1963
1964 -- Prepare arguments for call to linker
1965
1966 Call_Linker : declare
1967 Success : Boolean;
1968 Args : Argument_List (1 .. Num_Args + 1);
1969 Index : Integer := Args'First;
1970
1971 begin
1972 Args (Index) := Binder_Obj_File;
1973
1974 -- Add the object files and any -largs libraries
1975
1976 for J in Linker_Objects.First .. Linker_Objects.Last loop
1977 Index := Index + 1;
1978 Args (Index) := Linker_Objects.Table (J);
1979 end loop;
1980
1981 -- Add the linker options from the binder file
1982
1983 for J in Linker_Options.First .. Linker_Options.Last loop
1984 Index := Index + 1;
1985 Args (Index) := Linker_Options.Table (J);
1986 end loop;
1987
1988 -- Finally add the libraries from the --GCC= switch
1989
1990 for J in Gcc_Linker_Options.First .. Gcc_Linker_Options.Last loop
1991 Index := Index + 1;
1992 Args (Index) := Gcc_Linker_Options.Table (J);
1993 end loop;
1994
1995 if Verbose_Mode then
1996 Write_Str (Linker_Path.all);
1997
1998 for J in Args'Range loop
1999 Write_Str (" ");
2000 Write_Str (Args (J).all);
2001 end loop;
2002
2003 Write_Eol;
2004
2005 -- If we are on very verbose mode (-v -v) and a response file
2006 -- is used we display its content.
2007
2008 if Very_Verbose_Mode and then Tname_FD /= Invalid_FD then
2009 Write_Eol;
2010 Write_Str ("Response file (" &
2011 Tname (Tname'First .. Tname'Last - 1) &
2012 ") content : ");
2013 Write_Eol;
2014
2015 for J in
2016 Response_File_Objects.First .. Response_File_Objects.Last
2017 loop
2018 Write_Str (Response_File_Objects.Table (J).all);
2019 Write_Eol;
2020 end loop;
2021
2022 Write_Eol;
2023 end if;
2024 end if;
2025
2026 System.OS_Lib.Spawn (Linker_Path.all, Args, Success);
2027
2028 -- Delete the temporary file used in conjunction with linking if one
2029 -- was created. See Process_Bind_File for details.
2030
2031 if Tname_FD /= Invalid_FD then
2032 Delete (Tname);
2033 end if;
2034
2035 if not Success then
2036 Error_Msg ("error when calling " & Linker_Path.all);
2037 Exit_Program (E_Fatal);
2038 end if;
2039 end Call_Linker;
2040 end Link_Step;
2041
2042 -- Only keep the binder output file and it's associated object
2043 -- file if compiling with the -g option. These files are only
2044 -- useful if debugging.
2045
2046 if not Debug_Flag_Present then
2047 Delete (Binder_Ali_File.all & ASCII.NUL);
2048 Delete (Binder_Spec_Src_File.all & ASCII.NUL);
2049 Delete (Binder_Body_Src_File.all & ASCII.NUL);
2050 Delete (Binder_Obj_File.all & ASCII.NUL);
2051 end if;
2052
2053 Exit_Program (E_Success);
2054
2055 exception
2056 when X : others =>
2057 Write_Line (Exception_Information (X));
2058 Exit_With_Error ("INTERNAL ERROR. Please report");
2059 end Gnatlink;
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