path: root/gcc-1.40/README-VMS

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Date: 11 Sep 90 14:07:21 GMT
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Organization: University of Pennsylvania
Subject: Building gcc 1.37.1 with Vax C
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during it; hopefully they'll come in handy.
 
 To build the new gcc-cpp and gcc-cc1 that come with Gnu C
version 1.37.1 with Vax C and NOT a previous version of gcc,
do the following:
 
I - Building gcc-cpp
 
   A - Modify cccp.c
 
     1 - Replace
 
	#include <sys/types.h>
	#include <sys/stat.h>
 
       with
 
	#ifndef VMS
	#include <sys/types.h>
	#include <sys/stat.h>
	#else
	#include <types.h>
	#include <stat.h>
	#endif

[It is claimed that
    $ define sys sys$library
 will solve the same problem without source changes.]
 
     2 - In the VMS-specific section (has perror.h etc in it),
add the following:
 
	#include <descrip.h>	/* for dsc$descriptor_s */
	#include <string.h>	/* for strchr & strrchr */
	#define index	strchr
	#define rindex	strrchr
 
     3 - You have to replace all occurences of:
 
	extern char *index(), *rindex();
 
 as well as any where they're separated (e.g. extern char *index()
 by itself or extern char *rindex() by itself), with the following:
 
	#ifndef VMS
	extern char *index();	/* or whatever was here */
	#endif
 
 There's a total of three: one in main(), one in do_include(), and
 one in hack_vms_include_specification().
 
   B - You have to have alloca.mar for cccp.c; it was distributed
 with vmsgcc1.34; it's also in the bison distribution. (both 1.03
 and 1.06)
 
   C - After you've compiled alloca.mar (MACRO ALLOCA.MAR), follow
 the instructions at the top of MAKE-CC1.COM (namely, change the
 CC := line to say cc/noopt instead of gcc, take the
 cc1_options="-mpcc-alignment" part out of the CFLAGS line, and change
 the LIBS line to say:
 
	$ LIBS :=       alloca,sys$share:vaxcrtl/libr
 
   D - Since it doesn't come with the distribution, you have
 to generate cexp_tab.c yourself, either with bison on either
 a Vax or a Unix box, or yacc in Unix. (@make below will die if you
 don't have bison on your Vax or don't have this file)
 
   E - Type:
 
	@make
 
 and watch it hum. It should go through okay; it'll die on the LINK
line, but don't worry about it.
 
   F - Now link the whole thing with:
 
	link /nomap/exe=gcc-cpp cccp,cexp,version,alloca,-
	 sys$share:vaxcrtl/libr
 
   G - You should be screaming for joy right now; if you're not, then
give up on life. <snicker>
 
 
II - Building gcc-cc1
 
   A - Change MAKE-CC1.COM to contain the line:
 
	$ libs :== sys$share:vaxcrtl/libr,alloca
 
Yep, you have to have alloca.obj here too.
 
   B - Modify toplev.c:
 
     1 - Replace
 
	#include <sys/types.h>
	#include <sys/stat.h>
 
	with
 
	#ifndef VMS
	#include <sys/types.h>
	#include <sys/stat.h>
	#else
	#include <types.h>
	#include <stat.h>
	#endif
 
(You'll see this again.)
 
     2 - Do:
 
Repl:	rtx_equal_function_value_matters
With:	rtx_equ_func_value_matters
Num:	once
 
 This is cuz you can't have a name over 31 chars with the
Vax C compiler; and yep you guessed it this is over that
limit. You're gonna be doing this a few more times.
 
   C - Modify gcc.c:
 
     1 - This is optional, since you never compile it (I'm
working on that):
 
	Replace
 
	#include <stdio.h>
	#include <sys/types.h>
	#include <signal.h>
	#include <sys/file.h>
 
	with
 
	#include <stdio.h>
	#include <signal.h>
	#ifdef VMS
	#include <types.h>
	#include <file.h>
	#else
	#include <sys/types.h>
	#include <sys/file.h>
	#endif
 
   D - Modify c-parse_tab.c (if this isn't there, you'll have
to create it with bison or yacc):
 
Repl:	expand_start_loop_continue_elsewhere
With:	expand_startloop_cont_elsewhere
Num:	twice
 
   E - Modify tree.h:
 
Repl:	expand_start_loop_continue_elsewhere
With:	expand_startloop_cont_elsewhere
Num:	once
 
   F - Modify stmt.c:
 
Repl:	expand_start_loop_continue_elsewhere
With:	expand_startloop_cont_elsewhere
Num:	twice
 
Repl:	current_function_returns_pcc_struct
With:	cur_func_ret_pcc_struct
Num:	nine
 
Repl:	current_function_returns_pointer
With:	cur_func_ret_ptr
Num:	2
 
Repl:	current_function_pretend_args_size
With:	cur_func_pretend_args_size
Num:	3
 
   G - Modify rtanal.c:
 
Repl:	rtx_equal_function_value_matters
With:	rtx_equ_func_values_matters
Num:	twice
 
   H - Modify output.h:
 
Repl:	current_function_returns_pcc_struct
With:	cur_func_ret_pcc_struct
Num:	once
 
Repl: 	current_function_returns_pointer
With:	cur_func_ret_ptr
Num:	once
 
Repl:	current_function_pretend_args_size
With:	cur_func_pretend_args_size
Num:	once
 
   I - Modify tree.def:
 
 Change the line that reads:
 
	DEFTREECODE (FILE_TYPE, "file_type", "t", 0)
 
 to:
 
	#ifdef VMS
	DEFTREECODE (FILE_TYPE_GNU, "file_type", "t", 0)
	#else
	DEFTREECODE (FILE_TYPE, "file_type", "t", 0)
	#endif
 
 This is cuz FILE_TYPE is defined in stdio.h as being
struct _iobuf *, which totally screws everything up.
 
   J - Modify expr.c:
 
 Change the line that reads:
 
	if (code == FILE_TYPE)
 
 to:
 
	#ifdef VMS
	if (code == FILE_TYPE_GNU)
	#else
	if (code == FILE_TYPE)
	#endif
 
   K - Modify expmed.c:
 
 Change the line that reads:
 
 trymode && GET_MODE_SIZE (trymode) <= maxsize;
 
 to:
 
 (trymode != 0) && (GET_MODE_SIZE (trymode) <= maxsize);
 
 Enclosing the second half of the and in parenthesis may be
overkill. By the time I thought of it it was too late to
change it (read: I didn't feel like going back), but you
may want to give it a try.
 
   L - Modify symout.c:
 
 Change the line that has #include <stddef.h> on it to:
 
	#ifndef VMS
	#include <stddef.h>
	#else
	#define NULL	(void *) 0
	#endif
 
   M - Modify insn-emit.c:
 
 Line #1011 (in mine) is a 376-character long line that's
one HUGE return (it calls a function a few zillion times
embedded upon each other). This is a tad too big for Vax C
to chew; try cutting it down to a few lines. I made it look
like this:
 
rtx
gen_casesi (operand0, operand1, operand2, operand3)
     rtx operand0;
     rtx operand1;
     rtx operand2;
     rtx operand3;
{
  return gen_rtx (SET, VOIDmode, pc_rtx,
   gen_rtx (IF_THEN_ELSE, VOIDmode,
    gen_rtx (LE, VOIDmode,
     gen_rtx (MINUS, SImode, operand0, operand1),
    operand2),
    gen_rtx (PLUS, SImode,
     gen_rtx (SIGN_EXTEND, SImode,
      gen_rtx (MEM, HImode,
       gen_rtx (PLUS, SImode, pc_rtx,
        gen_rtx (MINUS, SImode, operand0, operand1)))),
     gen_rtx (LABEL_REF, SImode, operand3)),
   pc_rtx));
}
 
 Kinda smacks of lisp, no?
 
   N - Modify final.c:
 
 Change the line that reads:
 
	rtx final_sequence;
 
 to:
 
	#ifndef VMS
	rtx final_sequence;
	#endif
 
 This is cuz rtx final_sequence already appears in
output.h, and Vax C screams when it sees this.
 
   O - You have to have alloca(), bcopy(), bcmp(), and
bzero(); all are in the VMS Gcc 1.34 distribution; only
bcopy() is in the bison distribution. Since they're pretty
short, I'm gonna include 'em here. These were sent under the
Gnu public license.
 
 alloca.mar:
 
        .PSECT  $CODE,LONG,PIC,REL,SHR,EXE,RD,NOWRT
        .ENTRY  ALLOCA,^M<>
        SUBL2   4(AP),SP
        MOVL    16(FP),R1
        MOVQ    8(FP),AP
        BICL2   #3,SP
        ADDL2   #28,SP
        MOVL    SP,R0
        JMP     (R1)
 
        .END
 
 bcopy.mar:
 
        .PSECT  $CODE,LONG,PIC,REL,SHR,EXE,RD,NOWRT
	; bcopy(from, to, size)
        .ENTRY  BCOPY,^M<R2,R3,R4,R5,R6>
        MOVL    4(AP),R1
        MOVL    8(AP),R3
        MOVL    12(AP),R6
        CMPL    R1,R3
        BGTR    2$              ; NORMAL FORWARD CASE
        BLSS    3$              ; OVERLAPPING, MUST DO BACKWARDS
        RET                     ; EQUAL, NOTHING TO DO
1$:	SUBL2   R0,R6
        MOVC3   R0,(R1),(R3)
2$:	MOVZWL  #65535,R0
        CMPL    R6,R0
        BGTR    1$
        MOVC3   R6,(R1),(R3)
        RET
3$:	ADDL2   R6,R1
        ADDL2   R6,R3
        MOVZWL  #65535,R0
        BRW     5$
4$:	SUBL2   R0,R6
        SUBL2   R0,R1
        SUBL2   R0,R3
        MOVC3   R0,(R1),(R3)
        MOVZWL  #65535,R0
        SUBL2   R0,R1
        SUBL2   R0,R3
5$:	CMPL    R6,R0
        BGTR    4$
        SUBL2   R6,R1
        SUBL2   R6,R3
        MOVC3   R6,(R1),(R3)
 
       RET
 
        .END
 
 bcmp.mar:
 
        .PSECT  $CODE,LONG,PIC,REL,SHR,EXE,RD,NOWRT
	; bcmp(s1, s2, n)
        .ENTRY  BCMP,^M<R2,R3,R4,R5>
        MOVL    4(AP),R1
        MOVL    8(AP),R3
        MOVL    12(AP),R4
1$:	MOVZWL  #65535,R0
        CMPL    R4,R0
        BLEQ    2$
        SUBL2   R0,R4
        CMPC3   R0,(R1),(R3)
        BEQL    1$
        ADDL2   R4,R0
        RET
2$:	CMPC3   R4,(R1),(R3)
        RET
 
        .END
 
 
 bzero.mar:
 
        .PSECT  $CODE,LONG,PIC,REL,SHR,EXE,RD,NOWRT
	; bzero(ptr, size)
        .ENTRY  BZERO,^M<R2,R3,R4,R5>
        MOVL    4(AP),R3
        BRB     2$
1$:	SUBL2   R0,8(AP)
        MOVC5   #0,(R3),#0,R0,(R3)
2$:	MOVZWL  #65535,R0
        CMPL    8(AP),R0
        BGTR    1$
        MOVC5   #0,(R3),#0,8(AP),(R3)
        RET
 
        .END
 
   P - On the last lines (where it's got all of the link shit),
change it so it reads:
 
	...blahblahblah...
	...blahblah,insn-extract,insn-output,obstack,-
	integrate,caller-save,-
	bcopy,bcmp,bzero
	$!
 
 So now it'll link the bcopy, bcmp, and bzero routines in.
 
   Q - You should be screaming for joy right now; if you're
not, then give up on life again. Hey, I don't get paid for my humor.
 
   R - Finally, you have to use old versions of:
 
		GCC.EXE		GCC-AS.EXE
		GCC.COM		GCC.CLD
		GCCLIB.OLB
 
 to make the package work properly. I've only been able to make the
 new preprocessors make properly; since it wasn't even in the make
 files that came with it, I don't think gcc.exe 1.37.1 was intended
 to be built for the Vax .. we'll see.
 
 In case you're wondering, I could never get vmsgcc134 to work properly;
that's why I did this with Vax C.
 
 Good luck! This only worked under 5.3-1 (and the latest version of
Vax C...3.0? 3.1?), and isn't guaranteed in any way shape or form. If
you have stumbling blocks and think I may have come upon it during all
of this, feel free to mail me at kehoe@scotty.dccs.upenn.edu.
 
--
Brendan Kehoe | Soon: brendan@cs.widener.edu
For now: kehoe@scotty.dccs.upenn.edu | Or: bkehoe@widener.bitnet
     Last resort: brendan.kehoe@cyber.widener.edu
Brendan Kehoe | Soon: brendan@cs.widener.edu
For now: kehoe@scotty.dccs.upenn.edu | Or: bkehoe@widener.bitnet
Last resort: brendan.kehoe@cyber.widener.edu