http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #63 from mrs at gcc dot gnu.org mrs at gcc dot gnu.org 2011-02-07
20:41:54 UTC ---
Author: mrs
Date: Mon Feb 7 20:41:50 2011
New Revision: 169902
URL: http://gcc.gnu.org/viewcvs?root=gccview=revrev=169902
Log:
PR target/47558
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #64 from Iain Sandoe iains at gcc dot gnu.org 2011-02-07 20:52:40
UTC ---
(In reply to comment #63)
Author: mrs
Date: Mon Feb 7 20:41:50 2011
New Revision: 169902
URL: http://gcc.gnu.org/viewcvs?root=gccview=revrev=169902
Log:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #65 from Dominique d'Humieres dominiq at lps dot ens.fr
2011-02-07 20:55:31 UTC ---
/* The system ___divdc3 routine in libSystem on darwin10 is not
accurate to 1ulp, ours is, so we avoid ever using the system name
for
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #66 from mrs at gcc dot gnu.org mrs at gcc dot gnu.org 2011-02-07
21:46:12 UTC ---
Author: mrs
Date: Mon Feb 7 21:46:10 2011
New Revision: 169905
URL: http://gcc.gnu.org/viewcvs?root=gccview=revrev=169905
Log:
2011-02-07 Iain
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
m...@gcc.gnu.org mrs at gcc dot gnu.org changed:
What|Removed |Added
Status|WAITING |RESOLVED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #68 from Mike Stump mikestump at comcast dot net 2011-02-07
22:20:11 UTC ---
So, what you are saying is that the system routine produces an answer that
isn't correct down to the last digit of precision for at least 1 input?
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #69 from Dominique d'Humieres dominiq at lps dot ens.fr
2011-02-07 22:58:33 UTC ---
So, what you are saying is that the system routine produces an answer that
isn't correct down to the last digit of precision for at least 1 input?
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #70 from Mike Stump mikestump at comcast dot net 2011-02-08
03:44:09 UTC ---
If you would like to change the comments to clarify the nasty details, I'll
pre-approve it; though, I think it is unnecessary, as that work references this
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #71 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-08
03:58:46 UTC ---
I passed Dominique's observations upstream to the compiler-rt PR for this which
is the important thing.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #58 from Iain Sandoe iains at gcc dot gnu.org 2011-02-05 12:21:51
UTC ---
The response from Nick indicates that the documentation for -flat_namespace and
two-level namespaces is correct and up to date - so we should proceed with a
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #59 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-05
18:40:15 UTC ---
I can confirm that the patch in Comment 58 both eliminates the failure in the
reduced test case from Comment 56 as well as the failure in the dipCoup
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #60 from Iain Sandoe iains at gcc dot gnu.org 2011-02-05 18:57:20
UTC ---
(In reply to comment #59)
I can confirm that the patch in Comment 58 both eliminates the failure in the
reduced test case from Comment 56 as well as the
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #61 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-05
19:04:18 UTC ---
Actually the two issues are entirely intertwined. PR47558 was due to not
prioritizing symbols from libSystem over those from libgcc_ext. FYI, I don't
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #62 from Dominique d'Humieres dominiq at lps dot ens.fr
2011-02-05 19:23:09 UTC ---
... FYI, I don't
see why getting ___divdc3 fixed in time for Lion should be that difficult.
From the audit trail of PR42333, this is not a bug but
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #49 from Iain Sandoe iains at gcc dot gnu.org 2011-02-04 10:21:27
UTC ---
(In reply to comment #38)
This would avoid the need for reverting r163267.
I'd rather not revert r163267 because of the behavior described in comment #35.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #50 from Iain Sandoe iains at gcc dot gnu.org 2011-02-04 10:52:38
UTC ---
(In reply to comment #49)
(In reply to comment #38)
[ you might want to re-check
http://gcc.gnu.org/ml/gcc-patches/2011-02/msg00274.html would work with
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #51 from Iain Sandoe iains at gcc dot gnu.org 2011-02-04 10:57:39
UTC ---
(In reply to comment #37)
Let me know when the dust settles and you guys agree on the path forward and I
will decloak... I've been trying to avoid
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #52 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
11:02:02 UTC ---
ain,
I think the key misassumption you are making is that the internal linker
and dyld behavior for 10.5 is valid under 10.6. Remember that unlike
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #53 from Iain Sandoe iains at gcc dot gnu.org 2011-02-04 11:26:14
UTC ---
(In reply to comment #52)
ain,
I think the key misassumption you are making is that the internal linker
and dyld behavior for 10.5 is valid under 10.6.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #54 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
12:02:18 UTC ---
Test results for proposed patch in Comment 45 at
http://gcc.gnu.org/ml/gcc-testresults/2011-02/msg00416.html.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #55 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
12:31:28 UTC ---
Moved conversation upstream for definitive answer from the Apple linker
developer...
http://lists.apple.com/archives/darwin-dev//2011/Feb/msg0.html
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #56 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
15:11:29 UTC ---
The following works as a testcase for PR47558
test_main.c
--
void main (void)
{
extern int unwindcall(void);
int i;
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #57 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
15:16:42 UTC ---
For the testcase in Comment 56 using my proposed patch from Comment 45...
gcc-4 -dynamiclib -o libtestcall.dylib -flat_namespace -undefined suppress
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #33 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-03
13:57:23 UTC ---
(In reply to comment #32)
So either
1/revert 163267 as proposed,
Are we sure that it has no effect on any other (esp. Java) test-cases?
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #34 from Iain Sandoe iains at gcc dot gnu.org 2011-02-03 14:21:32
UTC ---
(In reply to comment #33)
(In reply to comment #32)
So either
1/revert 163267 as proposed,
Are we sure that it has no effect on any other (esp.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #35 from Iain Sandoe iains at gcc dot gnu.org 2011-02-03 14:29:25
UTC ---
(In reply to comment #34)
(In reply to comment #33)
(In reply to comment #32)
So either
1/revert 163267 as proposed,
Are we sure that it
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #36 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
00:30:30 UTC ---
No regressions on x86_64-apple-darwin10 from...
Index: gcc/config/darwin.h
===
---
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #37 from Mike Stump mikestump at comcast dot net 2011-02-04
00:43:50 UTC ---
Let me know when the dust settles and you guys agree on the path forward and I
will decloak... I've been trying to avoid reading/understanding the issue...
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #38 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
01:20:05 UTC ---
Actually, I think I see the problem here. Looking at how gcc-4.2 in Snow
Leopard links, I see...
gcc -v himenoBMTxpa.c
...
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #39 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
01:31:30 UTC ---
Also note that on Snow Leopard...
gcc -v -mmacosx-version-min=10.5 himenoBMTxpa.c
produces...
-lgcc_s.10.5 -lgcc -lSystem
so perhaps we just need...
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #40 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
01:47:16 UTC ---
Opps. It should be...
Index: gcc/config/darwin.h
===
--- gcc/config/darwin.h
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #41 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
02:39:45 UTC ---
Note that clang also precedes -lgcc with -lSystem. For
-mmacosx-version-min=10.6, it produces...
-lSystem -lgcc
(without the final -lSystem) but for
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #42 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
03:16:44 UTC ---
The patch in Comment 40 is insufficient to eliminate the exception traceback
failures in xplor-nih and it still back traces into FSF libgcc's unwinder
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #43 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
03:24:02 UTC ---
I would also argue, in support of the patch in Comment 42, that it may be wrong
to assume that Apple's linker handles stubs for libgcc_s.1.dylib for
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #44 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
04:48:21 UTC ---
The patch proposed in Comment 42 eliminates the exception traceback problems
when -flat_namespace is used in xplor-nih and changes our linkage to...
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #45 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
04:59:06 UTC ---
Patch posted at http://gcc.gnu.org/ml/gcc-patches/2011-02/msg00274.html.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #46 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
05:42:13 UTC ---
Note that with the proposed patch we will pick up the failures in...
FAIL: gcc.dg/torture/builtin-math-7.c -O0 execution test
FAIL:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #47 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
05:44:50 UTC ---
When the proposed patch goes into gcc trunk we should probably XFAIL
gcc.dg/torture/builtin-math-7.c for darwin10 as it is highly unlikely to be
fixed
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #48 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-04
05:53:00 UTC ---
Both...
[MacPro:~] howarth% gcj --main=testme -O testme.java
[MacPro:~] howarth% ./a.out
Hello
and
[MacPro:~] howarth% gcj -m32 --main=testme -O
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
Iain Sandoe iains at gcc dot gnu.org changed:
What|Removed |Added
Status|UNCONFIRMED |WAITING
Last
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #9 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 09:08:53
UTC ---
Jack,
The linkage of libs (with trunk darwin.h) is like this:
libgcc_ext.dylib --- exports our additional symbols (ONLY)**
libSystem contains the
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #10 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 13:25:31
UTC ---
two more minor points.
1/ the trunk lib specs do the same as gcc-4.2.1(apple local)
2/ there are no exported symbols for 10.6 in /usr/lib/libgcc_s.10.5.dylib
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #11 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
13:51:52 UTC ---
Created attachment 23195
-- http://gcc.gnu.org/bugzilla/attachment.cgi?id=23195
build log for xplor-nih 2.2.7 under gcc trunk
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #12 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
13:53:18 UTC ---
Created attachment 23196
-- http://gcc.gnu.org/bugzilla/attachment.cgi?id=23196
otool -L output for xplor-nih binaries
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #13 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
13:56:18 UTC ---
It was be true for the simple case that the reduced linkage is fine but somehow
the xplor-nih building is exposing a corner case we haven't thought of.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #14 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 14:37:39
UTC ---
the difference caused by including a reference to /usr/libgcc_s.xxx is to
allow a libgcc_s appearing in a DYLD_LIBRARY_PATH (or a fallback path in the
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #15 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
15:11:51 UTC ---
DYLD_LIBRARY_PATH is unset when xplor is started. Also remember that your test
case in comment 9 is insufficient to reproduce the behavior of xplor-nih.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #16 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 15:26:15
UTC ---
(In reply to comment #15)
Perhaps r163267 is fragile to certain combination of linker flags (like
-flat_namespace)?
fragile LOL...
man ld:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #17 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 15:50:44
UTC ---
I guess you could make the requirement to link libSystem before (and after)
libgcc_ext explicit like this:
Index: gcc/config/darwin10.h
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #18 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 15:57:30
UTC ---
(In reply to comment #17)
I guess you could make the requirement to link libSystem before (and after)
libgcc_ext explicit like this:
you would also need to
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #19 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
15:59:30 UTC ---
(In reply to comment #16)
(In reply to comment #15)
Perhaps r163267 is fragile to certain combination of linker flags (like
-flat_namespace)?
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #20 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 16:32:13
UTC ---
(In reply to comment #19)
(In reply to comment #16)
(In reply to comment #15)
Perhaps r163267 is fragile to certain combination of linker flags
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #21 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 16:40:17
UTC ---
(In reply to comment #20)
(In reply to comment #19)
(In reply to comment #16)
(In reply to comment #15)
In the short-term, we can either revert the
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #22 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
16:57:04 UTC ---
My only comment is that the likely users of FSF gcc are also likely builders of
ported unix code. So gcc 4.6 needs a big fat warning that existing
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #23 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 17:28:36
UTC ---
(In reply to comment #22)
My only comment is that the likely users of FSF gcc are also likely builders
of
ported unix code. So gcc 4.6 needs a big fat
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #24 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 17:49:34
UTC ---
(In reply to comment #23)
(In reply to comment #22)
My only comment is that the likely users of FSF gcc are also likely
builders of
ported unix code. So
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #25 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
18:22:45 UTC ---
Again, I would note Nick's original comments on these issues...
This may be that the libgcc_s.dylib based unwinder is incompatible
with the darwin
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #26 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 18:40:53
UTC ---
(In reply to comment #25)
Again, I would note Nick's original comments on these issues...
So for compatibility with any Apple gcc built software, we should
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #27 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
19:10:35 UTC ---
I am testing the patch proposed in Comment 24 on darwin10 now.
Don't we also have to handle Zforce_flat_namespace?
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #28 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
20:08:51 UTC ---
Strangely this is insufficient to eliminate the crash (which still ends up in
the FSF libgcc unwinder)...
-- POWELL -- step= 5 --- stepsize=
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #29 from Iain Sandoe iains at gcc dot gnu.org 2011-02-01 23:53:31
UTC ---
(In reply to comment #28)
Strangely this is insufficient to eliminate the crash (which still ends up in
the FSF libgcc unwinder)...
In fact, the only thing
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #30 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-02
02:22:37 UTC ---
(In reply to comment #29)
If linking the final exe is done with -flat_namespace does it work?
Yes, adding -flat_namespace solves the problem. I
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #31 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-02
02:54:50 UTC ---
I can confirm that adding -flat_namespace to the linkage of xplor using stock
gcc trunk is insufficient to eliminate the crashes in the FSF libgcc
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #1 from Jack Howarth howarth at nitro dot med.uc.edu 2011-01-31
23:36:35 UTC ---
The following patch reverting the remainder of r163267 eliminates the dipCoup
testcase failure in xplor-nih 2.27 when built with current gcc trunk on
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #2 from Jack Howarth howarth at nitro dot med.uc.edu 2011-01-31
23:42:04 UTC ---
Created attachment 23190
-- http://gcc.gnu.org/bugzilla/attachment.cgi?id=23190
differences in xplor-nih linkages from r163266 to r163267
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #3 from Iain Sandoe iains at gcc dot gnu.org 2011-01-31 23:49:31
UTC ---
we keep going round this loop --- by making this change; you are replacing the
unwinder in libSystem with the one in FSF libgcc_s.
This might well work for
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #4 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
00:14:17 UTC ---
(In reply to comment #3)
we keep going round this loop --- by making this change; you are replacing the
unwinder in libSystem with the one in FSF
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #5 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
00:32:07 UTC ---
Iain,
I think you are confused about what reverting r163267 achieves. I believe
the remaining change in r163267 was left in place because we were
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #6 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
03:55:13 UTC ---
We should be very concerned about the fact that on the darwin10 builds of gcc
trunk, we don't prefix the same symbols in the FSF gcc's libgcc_s.1.dylib
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #7 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
04:01:52 UTC ---
Also note that on darwin10...
lrwxr-xr-x 1 root wheel 17 Nov 4 19:37 libgcc_s.1.dylib -
libSystem.B.dylib
lrwxr-xr-x 1 root wheel 19 Nov 4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47558
--- Comment #8 from Jack Howarth howarth at nitro dot med.uc.edu 2011-02-01
06:10:32 UTC ---
Actually a backtrace confirms that current gcc trunk is broken and the missing
linkage on /usr/lib/libgcc_s.1.dylib is causing the wrong unwinder to be
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