* Problems building GNAT on OS X with top-of-tree
@ 2002-10-15 21:08 Geert Bosch
2002-10-16 10:43 ` Dale Johannesen
2002-10-16 10:59 ` Dale Johannesen
0 siblings, 2 replies; 14+ messages in thread
From: Geert Bosch @ 2002-10-15 21:08 UTC (permalink / raw)
To: gcc
I am trying to get up to speed with the head of the GCC tree, but while
building stage2 of the GNAT, any non-trivial file fails to compile with
assembler errors as follows:
stage1/xgcc -Bstage1/ -B/usr/local/powerpc-apple-darwin6.1/bin/ -c -g
-O2 -gnatpg -gnata -g -O1 -fno-inline \
-I- -I. -Iada -I/Users/bosch/gcc/gcc/ada
/Users/bosch/gcc/gcc/ada/a-except.adb -o ada/a-except.o
a-except.s:unknown:Can't emit reloc {- symbol "L65$pb"} @ file address
9408.
a-except.s:unknown:Can't emit reloc {- symbol "L65$pb"} @ file address
9404.
a-except.s:unknown:Can't emit reloc {- symbol "L64$pb"} @ file address
9296.
a-except.s:unknown:Can't emit reloc {- symbol "L64$pb"} @ file address
9292.
a-except.s:unknown:Can't emit reloc {- symbol "L64$pb"} @ file address
9216.
a-except.s:unknown:Can't emit reloc {- symbol "L64$pb"} @ file address
9212.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
9056.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
9052.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8868.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8864.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8680.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8676.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8572.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8568.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8532.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8528.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8452.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8448.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8360.
a-except.s:unknown:Can't emit reloc {- symbol "L63$pb"} @ file address
8356.
a-except.s:unknown:Can't emit reloc {- symbol "L43$pb"} @ file address
6140.
a-except.s:unknown:Can't emit reloc {- symbol "L43$pb"} @ file address
6136.
a-except.s:unknown:Can't emit reloc {- symbol "L43$pb"} @ file address
5980.
a-except.s:unknown:Can't emit reloc {- symbol "L43$pb"} @ file address
5976.
a-except.s:unknown:Can't emit reloc {- symbol "L43$pb"} @ file address
5952.
a-except.s:unknown:Can't emit reloc {- symbol "L43$pb"} @ file address
5948.
a-except.s:unknown:Can't emit reloc {- symbol "L43$pb"} @ file address
5824.
a-except.s:unknown:Can't emit reloc {- symbol "L43$pb"} @ file address
5820.
a-except.s:unknown:Can't emit reloc {- symbol "L42$pb"} @ file address
5468.
a-except.s:unknown:Can't emit reloc {- symbol "L42$pb"} @ file address
5464.
I guess this refers to code like:
addis r9,r31,ha16(
L_system__soft_links__get_jmpbuf_address$non_lazy_ptr-
L42$pb)
lwz
r9,lo16(L_system__soft_links__get_jmpbuf_address$non_lazy_ptr-
L42$pb)(r9)
Indeed, this looks dubious and IIRC, there was a similar problem a long
while ago. Do these symptoms ring a bell with anyone? If not, I'll see
if I can debug this and see why this code gets generated. Thanks in
advance for any help.
-Geert
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-15 21:08 Problems building GNAT on OS X with top-of-tree Geert Bosch
@ 2002-10-16 10:43 ` Dale Johannesen
2002-10-16 10:59 ` Dale Johannesen
1 sibling, 0 replies; 14+ messages in thread
From: Dale Johannesen @ 2002-10-16 10:43 UTC (permalink / raw)
To: Geert Bosch; +Cc: Dale Johannesen, gcc
On Tuesday, October 15, 2002, at 06:32 PM, Geert Bosch wrote:
> a-except.s:unknown:Can't emit reloc {- symbol "L42$pb"} @ file address
> 5464.
>
> I guess this refers to code like:
> addis
> r9,r31,ha16(L_system__soft_links__get_jmpbuf_address$non_lazy_ptr-
> L42$pb)
> lwz
> r9,lo16(L_system__soft_links__get_jmpbuf_address$non_lazy_ptr-
> L42$pb)(r9)
The code you quote here looks correct. Probably the definition of
L42$pb
is missing; it should be near the top of the function. The RTL for it
should be generated by gen_load_macho_picbase() called from
rs6000_emit_prologue().
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-15 21:08 Problems building GNAT on OS X with top-of-tree Geert Bosch
2002-10-16 10:43 ` Dale Johannesen
@ 2002-10-16 10:59 ` Dale Johannesen
2002-10-16 11:30 ` Geert Bosch
1 sibling, 1 reply; 14+ messages in thread
From: Dale Johannesen @ 2002-10-16 10:59 UTC (permalink / raw)
To: Geert Bosch; +Cc: Dale Johannesen, gcc
On Tuesday, October 15, 2002, at 06:32 PM, Geert Bosch wrote:
> a-except.s:unknown:Can't emit reloc {- symbol "L65$pb"} @ file address
> 9404.
> I guess this refers to code like:
> addis r9,r31,ha16(
> L_system__soft_links__get_jmpbuf_address$non_lazy_ptr-
> L42$pb)
> lwz
> r9,lo16(L_system__soft_links__get_jmpbuf_address$non_lazy_ptr-
> L42$pb)(r9)
Another possibility is that
L_system__soft_links__get_jmpbuf_address$non_lazy_ptr
is not defined. In either case I'd expect to see an "undefined symbol"
message from the assembler though. If neither of those is it, send me
a .s file and I'll figure it out.
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-16 10:59 ` Dale Johannesen
@ 2002-10-16 11:30 ` Geert Bosch
2002-10-16 11:48 ` Dale Johannesen
0 siblings, 1 reply; 14+ messages in thread
From: Geert Bosch @ 2002-10-16 11:30 UTC (permalink / raw)
To: Dale Johannesen; +Cc: gcc
On Wednesday, Oct 16, 2002, at 13:12 America/New_York, Dale Johannesen
wrote:
> Another possibility is that
> L_system__soft_links__get_jmpbuf_address$non_lazy_ptr
> is not defined. In either case I'd expect to see an "undefined symbol"
> message from the assembler though. If neither of those is it, send me
> a .s file and I'll figure it out.
It's defined in the .data segment, while the reference is in the .code
segment. I can see how this wouldn't work...
-Geert
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-16 11:30 ` Geert Bosch
@ 2002-10-16 11:48 ` Dale Johannesen
2002-10-16 13:14 ` Geert Bosch
0 siblings, 1 reply; 14+ messages in thread
From: Dale Johannesen @ 2002-10-16 11:48 UTC (permalink / raw)
To: Geert Bosch; +Cc: Dale Johannesen, gcc
On Wednesday, October 16, 2002, at 10:37 AM, Geert Bosch wrote:
>
> On Wednesday, Oct 16, 2002, at 13:12 America/New_York, Dale Johannesen
> wrote:
>> Another possibility is that
>> L_system__soft_links__get_jmpbuf_address$non_lazy_ptr
>> is not defined. In either case I'd expect to see an "undefined
>> symbol"
>> message from the assembler though. If neither of those is it, send me
>> a .s file and I'll figure it out.
>
> It's defined in the .data segment, while the reference is in the .code
> segment. I can see how this wouldn't work...
No, that is supposed to be OK. non_lazy_ptr's are used for
references to the address of a function (pointer-to-function) like this:
extern int (*f)(int (*)());
main() {
(*f)(f);
}
.text ....
_main: ....
bcl 20,31,L1$pb
L1$pb: ....
addis r9,r31,ha16(L_f$non_lazy_ptr-L1$pb)
lwz r11,lo16(L_f$non_lazy_ptr-L1$pb)(r9)
addis r9,r31,ha16(L_f$non_lazy_ptr-L1$pb)
lwz r9,lo16(L_f$non_lazy_ptr-L1$pb)(r9)
lwz r0,0(r11)
lwz r3,0(r9)
mr r12,r0
mtctr r12
bctrl
....
.data
.non_lazy_symbol_pointer
L_f$non_lazy_ptr:
.indirect_symbol _f
So what's different about yours?
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-16 11:48 ` Dale Johannesen
@ 2002-10-16 13:14 ` Geert Bosch
0 siblings, 0 replies; 14+ messages in thread
From: Geert Bosch @ 2002-10-16 13:14 UTC (permalink / raw)
To: Dale Johannesen; +Cc: gcc
On Wednesday, Oct 16, 2002, at 13:47 America/New_York, Dale Johannesen
wrote:
> No, that is supposed to be OK. non_lazy_ptr's are used for
> references to the address of a function (pointer-to-function) like
> this:
>
> extern int (*f)(int (*)());
> main() {
> (*f)(f);
> }
>
> .text ....
> _main: ....
> bcl 20,31,L1$pb
> L1$pb: ....
> addis r9,r31,ha16(L_f$non_lazy_ptr-L1$pb)
> lwz r11,lo16(L_f$non_lazy_ptr-L1$pb)(r9)
> addis r9,r31,ha16(L_f$non_lazy_ptr-L1$pb)
> lwz r9,lo16(L_f$non_lazy_ptr-L1$pb)(r9)
> lwz r0,0(r11)
> lwz r3,0(r9)
> mr r12,r0
> mtctr r12
> bctrl
> ....
> .data
> .non_lazy_symbol_pointer
> L_f$non_lazy_ptr:
> .indirect_symbol _f
>
> So what's different about yours?
It seems to be the same. It doesn't help that the assembly
message seems to refer to a location in the output file, which
is not written to disk. Anyway, I'll send you the a-except.s
file in a private email. Thanks for your help!
-Geert
.text
...
L42$pb:
...
addis r9,r31,ha16(
L_system__soft_links__get_jmpbuf_address$non_lazy_ptr-L42$pb)
lwz r9,lo16(
L_system__soft_links__get_jmpbuf_address$non_lazy_ptr-L42$pb)(r9)
lwz r9,0(r9)
mtctr r9
bctrl
...
.data
...
.non_lazy_symbol_ptr
...
L_system__soft_links__get_jmpbuf_address$non_lazy_ptr:
.indirect_symbol _system__soft_links__get_jmpbuf_address
.long 0
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-17 17:06 ` Dale Johannesen
@ 2002-10-17 20:59 ` Geoffrey Keating
0 siblings, 0 replies; 14+ messages in thread
From: Geoffrey Keating @ 2002-10-17 20:59 UTC (permalink / raw)
To: Dale Johannesen; +Cc: Geert Bosch, gcc
On Thursday, October 17, 2002, at 02:52 PM, Dale Johannesen wrote:
>
> On Thursday, October 17, 2002, at 02:38 PM, Geoffrey Keating wrote:
>> On Thursday, October 17, 2002, at 02:10 PM, Dale Johannesen wrote:
>>>
>>> Actually this looks like it is connected to Geoff's recent patch
>>> http://gcc.gnu.org/ml/gcc-patches/2002-09/msg01259.html
>>> which introduced the LSJR label. Geoff, is
>>> current_function_uses_pic_offset_table not getting set anywhere?
>>> That would account for his symptom.
>>>
>> It is supposed to be set by machopic_function_base_name, which is
>> called to generate the label. Looking at the code, my suspicion is
>> that the original load_macho_picbase pattern is getting deleted by
>> flow because it appears dead, but that also deletes the label that
>> the macho_correct_pic needs.
>>
>> If so, the solution is to use a real CODE_LABEL instead of having the
>> label inside load_macho_picbase, but this will be a complex change.
>
> Hmm. How do you keep the bcl and the following label together through
> the scheduler?
> SCHED_GROUP_P used to work on labels, but it doesn't any more, and I
> never found
> another way to do it. Would a USE of the label work?
That's a tricky one.
What you really want to do is say
(parallel [(set (pc) (label_ref (code_label ...)))
(set (reg:SI lr) (label_ref (code_label ...)))])
because that accurately describes what load_macho_picbase really does,
but reload can't deal with that, it doesn't like jump instructions that
have output reloads.
Since we can't do the nice thing, probably a good second-best is, for
functions that need this restore (perhaps those that have
current_function_has_nonlocal_label set) to ensure that the original
load_macho_picbase never gets deleted by adding a suitable USE of the
PIC register.
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-17 15:22 ` Geoffrey Keating
@ 2002-10-17 17:06 ` Dale Johannesen
2002-10-17 20:59 ` Geoffrey Keating
0 siblings, 1 reply; 14+ messages in thread
From: Dale Johannesen @ 2002-10-17 17:06 UTC (permalink / raw)
To: Geoffrey Keating; +Cc: Dale Johannesen, Geert Bosch, gcc
On Thursday, October 17, 2002, at 02:38 PM, Geoffrey Keating wrote:
> On Thursday, October 17, 2002, at 02:10 PM, Dale Johannesen wrote:
>>
>> Actually this looks like it is connected to Geoff's recent patch
>> http://gcc.gnu.org/ml/gcc-patches/2002-09/msg01259.html
>> which introduced the LSJR label. Geoff, is
>> current_function_uses_pic_offset_table not getting set anywhere?
>> That would account for his symptom.
>>
> It is supposed to be set by machopic_function_base_name, which is
> called to generate the label. Looking at the code, my suspicion is
> that the original load_macho_picbase pattern is getting deleted by
> flow because it appears dead, but that also deletes the label that the
> macho_correct_pic needs.
>
> If so, the solution is to use a real CODE_LABEL instead of having the
> label inside load_macho_picbase, but this will be a complex change.
Hmm. How do you keep the bcl and the following label together through
the scheduler?
SCHED_GROUP_P used to work on labels, but it doesn't any more, and I
never found
another way to do it. Would a USE of the label work?
>> (This is probably unrelated to your earlier bug.)
>
> Well, it's certainly related, in the sense that if I hadn't fixed that
> bug this code would now fail at runtime instead of compile-time…
(I meant Geert Bosch's earlier bug, not yours. Sorry to be unclear.)
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-17 15:02 ` Dale Johannesen
@ 2002-10-17 15:22 ` Geoffrey Keating
2002-10-17 17:06 ` Dale Johannesen
0 siblings, 1 reply; 14+ messages in thread
From: Geoffrey Keating @ 2002-10-17 15:22 UTC (permalink / raw)
To: Dale Johannesen; +Cc: Geert Bosch, gcc
On Thursday, October 17, 2002, at 02:10 PM, Dale Johannesen wrote:
>
> On Thursday, October 17, 2002, at 01:44 PM, Geert Bosch wrote:
>> ali.s:unknown:Can't emit reloc {- symbol "LSJR827"} @ file address
>> 30708.
>> ali.s:unknown:Can't emit reloc {- symbol "LSJR827"} @ file address
>> 30704.
>> ali.s:unknown:Undefined local symbol L149$pb
>>
>> The piece of assembly in question is:
>> LSJR827:
>> mflr r31
>> addis r31,r31,ha16(L149$pb-LSJR827)
>> addi r31,r31,lo16(L149$pb-LSJR827)
>
> Actually this looks like it is connected to Geoff's recent patch
> http://gcc.gnu.org/ml/gcc-patches/2002-09/msg01259.html
> which introduced the LSJR label. Geoff, is
> current_function_uses_pic_offset_table not getting set anywhere?
> That would account for his symptom.
>
It is supposed to be set by machopic_function_base_name, which is
called to generate the label. Looking at the code, my suspicion is
that the original load_macho_picbase pattern is getting deleted by
flow because it appears dead, but that also deletes the label that the
macho_correct_pic needs.
If so, the solution is to use a real CODE_LABEL instead of having the
label inside load_macho_picbase, but this will be a complex change.
> (This is probably unrelated to your earlier bug.)
Well, it's certainly related, in the sense that if I hadn't fixed that
bug this code would now fail at runtime instead of compile-time…
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-17 14:52 ` Geert Bosch
2002-10-17 15:00 ` Dale Johannesen
@ 2002-10-17 15:02 ` Dale Johannesen
2002-10-17 15:22 ` Geoffrey Keating
1 sibling, 1 reply; 14+ messages in thread
From: Dale Johannesen @ 2002-10-17 15:02 UTC (permalink / raw)
To: Geert Bosch; +Cc: Dale Johannesen, gcc, Geoffrey Keating
On Thursday, October 17, 2002, at 01:44 PM, Geert Bosch wrote:
> ali.s:unknown:Can't emit reloc {- symbol "LSJR827"} @ file address
> 30708.
> ali.s:unknown:Can't emit reloc {- symbol "LSJR827"} @ file address
> 30704.
> ali.s:unknown:Undefined local symbol L149$pb
>
> The piece of assembly in question is:
> LSJR827:
> mflr r31
> addis r31,r31,ha16(L149$pb-LSJR827)
> addi r31,r31,lo16(L149$pb-LSJR827)
Actually this looks like it is connected to Geoff's recent patch
http://gcc.gnu.org/ml/gcc-patches/2002-09/msg01259.html
which introduced the LSJR label. Geoff, is
current_function_uses_pic_offset_table not getting set anywhere?
That would account for his symptom.
(This is probably unrelated to your earlier bug.)
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-17 14:52 ` Geert Bosch
@ 2002-10-17 15:00 ` Dale Johannesen
2002-10-17 15:02 ` Dale Johannesen
1 sibling, 0 replies; 14+ messages in thread
From: Dale Johannesen @ 2002-10-17 15:00 UTC (permalink / raw)
To: Geert Bosch; +Cc: Dale Johannesen, gcc
On Thursday, October 17, 2002, at 01:44 PM, Geert Bosch wrote:
> ali.s:unknown:Can't emit reloc {- symbol "LSJR827"} @ file address
> 30708.
> ali.s:unknown:Can't emit reloc {- symbol "LSJR827"} @ file address
> 30704.
> ali.s:unknown:Undefined local symbol L149$pb
>
> The piece of assembly in question is:
> LSJR827:
> mflr r31
> addis r31,r31,ha16(L149$pb-LSJR827)
> addi r31,r31,lo16(L149$pb-LSJR827)
>
> This reference is generated by machopic_function_base_name () in
> darwin.c,
> but there is no documentation as to who should generate this label...
It is generated by gen_load_macho_picbase() which should be called from
rs6000_emit_prologue().
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-16 15:00 ` Dale Johannesen
@ 2002-10-17 14:52 ` Geert Bosch
2002-10-17 15:00 ` Dale Johannesen
2002-10-17 15:02 ` Dale Johannesen
0 siblings, 2 replies; 14+ messages in thread
From: Geert Bosch @ 2002-10-17 14:52 UTC (permalink / raw)
To: Dale Johannesen; +Cc: gcc
Dale wrote:
>> I'm focussing now on finding out why this problems does not occur with
>> the C front end, which seems to use the same method for outputting
>> variables in the common section.
>
> You could do that. Alternatively, I see that the correct sequence is
> generated for ada__exceptions__null_occurrence, which is also a .comm
> symbol. You might look and see what's different about the symbols.
> This is probably just a matter of getting some field set correctly.
Actually, I tried to build with -fno-common and a few files later,
while compiling ali.adb with stage1/gnat, we fail in a clearer way:
ali.s:unknown:Can't emit reloc {- symbol "LSJR827"} @ file address
30708.
ali.s:unknown:Can't emit reloc {- symbol "LSJR827"} @ file address
30704.
ali.s:unknown:Undefined local symbol L149$pb
The piece of assembly in question is:
LSJR827:
mflr r31
addis r31,r31,ha16(L149$pb-LSJR827)
addi r31,r31,lo16(L149$pb-LSJR827)
This reference is generated by machopic_function_base_name () in
darwin.c,
but there is no documentation as to who should generate this label...
-Geert
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
2002-10-16 13:28 ` Geert Bosch
@ 2002-10-16 15:00 ` Dale Johannesen
2002-10-17 14:52 ` Geert Bosch
0 siblings, 1 reply; 14+ messages in thread
From: Dale Johannesen @ 2002-10-16 15:00 UTC (permalink / raw)
To: Geert Bosch; +Cc: Dale Johannesen, gcc
On Wednesday, October 16, 2002, at 12:52 PM, Geert Bosch wrote:
> OK, I see. Indeed, using -fno-common eliminates/suppresses the problem.
> However, I don't see how the front end should have to know
> about these details. I looked at darwin.c, and I see the implementation
> of the scheme using lazy and non-lazy pointers, but there does not
> seem to be any documentation at a sufficiently high level to be able
> to understand what is going on there.
Right. I didn't write it, and I still find it confusing.
> I'm focussing now on finding out why this problems does not occur with
> the C front end, which seems to use the same method for outputting
> variables in the common section.
You could do that. Alternatively, I see that the correct sequence is
generated for ada__exceptions__null_occurrence, which is also a .comm
symbol. You might look and see what's different about the symbols.
This is probably just a matter of getting some field set correctly.
^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: Problems building GNAT on OS X with top-of-tree
[not found] <E5B21272-E13A-11D6-B07C-000393D76DAA@apple.com>
@ 2002-10-16 13:28 ` Geert Bosch
2002-10-16 15:00 ` Dale Johannesen
0 siblings, 1 reply; 14+ messages in thread
From: Geert Bosch @ 2002-10-16 13:28 UTC (permalink / raw)
To: Dale Johannesen; +Cc: gcc
On Wednesday, Oct 16, 2002, at 15:10 America/New_York, Dale Johannesen
wrote:
> OK, the problem is code that looks like this:
>
> .comm _ada__exceptions__subprogram_descriptors,8
> ....
> addis
> r9,r31,ha16(_ada__exceptions__subprogram_descriptors-L42$pb)
> lwz
> r9,lo16(_ada__exceptions__subprogram_descriptors-L42$pb)(r9)
>
> This object looks like something the Ada FE created.
> .comm data must be addressed by the non_lazy_ptr mechanism:
>
> int x[20];
> main() { foo(x); }
>
> addis r9,r31,ha16(L_x$non_lazy_ptr-L1$pb)
> lwz r3,lo16(L_x$non_lazy_ptr-L1$pb)(r9)
> .comm _x,80
> .data
> .non_lazy_symbol_pointer
> L_x$non_lazy_ptr:
> .indirect_symbol _x
> .long 0
>
> The mechanism is in config/darwin.c and config/rs6000/rs6000.c.
> machopic_legitimize_pic_address is probably a good place to start.
>
OK, I see. Indeed, using -fno-common eliminates/suppresses the problem.
However, I don't see how the front end should have to know
about these details. I looked at darwin.c, and I see the implementation
of the scheme using lazy and non-lazy pointers, but there does not
seem to be any documentation at a sufficiently high level to be able
to understand what is going on there.
I'm focussing now on finding out why this problems does not occur with
the C front end, which seems to use the same method for outputting
variables in the common section.
-Geert
^ permalink raw reply [flat|nested] 14+ messages in thread
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Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
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2002-10-15 21:08 Problems building GNAT on OS X with top-of-tree Geert Bosch
2002-10-16 10:43 ` Dale Johannesen
2002-10-16 10:59 ` Dale Johannesen
2002-10-16 11:30 ` Geert Bosch
2002-10-16 11:48 ` Dale Johannesen
2002-10-16 13:14 ` Geert Bosch
[not found] <E5B21272-E13A-11D6-B07C-000393D76DAA@apple.com>
2002-10-16 13:28 ` Geert Bosch
2002-10-16 15:00 ` Dale Johannesen
2002-10-17 14:52 ` Geert Bosch
2002-10-17 15:00 ` Dale Johannesen
2002-10-17 15:02 ` Dale Johannesen
2002-10-17 15:22 ` Geoffrey Keating
2002-10-17 17:06 ` Dale Johannesen
2002-10-17 20:59 ` Geoffrey Keating
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