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digitalmars.D.bugs - [Issue 9044] New: Random "Previous Definition Different" optlink failure (looks like a buffer overflow bug somewhere)

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           Summary: Random "Previous Definition Different" optlink failure
                    (looks like a buffer overflow bug somewhere)
           Product: D
           Version: D2
          Platform: All
        OS/Version: Windows
            Status: NEW
          Keywords: link-failure
          Severity: regression
          Priority: P1
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: verylonglogin.reg gmail.com


--- Comment #0 from Denis Shelomovskij <verylonglogin.reg gmail.com> 2012-11-18
13:57:15 MSK ---
Created an attachment (id=1162)
Testcase

Not sure if it is a dmd regression or dmd changes discovered new optlink bug.

Looks like a buffer overflow bug somewhere as removing almost any definition of
any file makes testcase linkable.

Testcase building output (launching "build.bat"):
---
OPTLINK (R) for Win32  Release 8.00.12
Copyright (C) Digital Mars 1989-2010  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
xlib.lib(object)  Offset FFD10H Record Type 0091
 Error 1: Previous Definition Different :
_D64D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.5412__ModuleInfoZ
xlib.lib(object)  Offset FFDECH Record Type 00C3
 Error 1: Previous Definition Different :
_D64D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.547__arrayZ
xlib.lib(object)  Offset FFE1EH Record Type 00C3
 Error 1: Previous Definition Different :
_D64D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.548__assertFiZv
xlib.lib(object)  Offset FFE50H Record Type 00C3
 Error 1: Previous Definition Different :
_D64D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.5415__unittest_failFiZv
---

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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |INVALID


--- Comment #1 from Walter Bright <bugzilla digitalmars.com> 2012-12-10
04:26:01 PST ---
"previous definition different" means you have the same name defined more than
once.

http://www.digitalmars.com/ctg/OptlinkErrorMessages.html#previous_definition_different

I suspect the problem you are having stems from having a file named "object.d"
in your xlib.

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Denis Shelomovskij <verylonglogin.reg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |


--- Comment #2 from Denis Shelomovskij <verylonglogin.reg gmail.com> 2012-12-10
19:06:57 MSK ---
(In reply to comment #1)

 I suspect the problem you are having stems from having a file named "object.d"
 in your xlib.


Are you writing it seriously? I'm not a newbie, I know linker error messages
and I think of what I'm reporting.

Have you looked at testcase? It consists of a.d, b.d, c.d, d.d, and main.d.

Have you read the description? The error disappear if almost any definition of
any file is removed.

Probably you are very tired and need some rest...

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--- Comment #3 from Walter Bright <bugzilla digitalmars.com> 2012-12-22
18:54:07 PST ---
Attempting to extract your test case:

------------------------------
7z l linker-error.7z

7-Zip 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18

Error:
7-Zip cannot find the code that works with archives.
------------------------------

Please use ordinary zip files or just upload the files themselves.

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--- Comment #4 from Denis Shelomovskij <verylonglogin.reg gmail.com> 2012-12-23
12:11:51 MSK ---
(In reply to comment #3)

 Attempting to extract your test case:
 
 ------------------------------
 7z l linker-error.7z
 
 7-Zip 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18
 
 Error:
 7-Zip cannot find the code that works with archives.
 ------------------------------
 
 Please use ordinary zip files or just upload the files themselves.


Common! 7-Zip has [one of] the best compression ratio, small compression time,
good GUI and explorer integration, so why not to use it?

Also why not to use the installer? If you really want to do everything
manually, why are you complaining about errors? It is you decision to not use
installer and user-friendly GUI.

But if you for some reason need to use 7z.exe, you also need 7z.dll for "code
that works with archives".

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--- Comment #5 from Walter Bright <bugzilla digitalmars.com> 2012-12-23
12:13:04 PST ---
(In reply to comment #4)

 Common! 7-Zip has [one of] the best compression ratio, small compression time,
 good GUI and explorer integration, so why not to use it?


Who cares? File size simply no longer matters, especially not 5K. I've already
spend magnitudes more time trying to get it uncompressed than any microseconds
it supposedly saves. I'm not spending any more time on it.



 Also why not to use the installer? If you really want to do everything
 manually, why are you complaining about errors? It is you decision to not use
 installer and user-friendly GUI.


If it's my fault that 7z.exe does not work with 7z files, that makes me even
less interested in 7z.



 But if you for some reason need to use 7z.exe, you also need 7z.dll for "code
 that works with archives".


That's exactly why I don't care to use it. It does not work without mucking
about with it. .zip works everywhere, no issues.

Please upload the files in a usable format. I'm interested in fixing the bug in
this issue. I couldn't be less interested in wrestling with 7z.

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Max Samukha <samukha voliacable.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |samukha voliacable.com


--- Comment #6 from Max Samukha <samukha voliacable.com> 2012-12-23 12:29:03
PST ---
That's not funny any more, really. Walter, is it really hard to install 7-zip
extractor? It is ubiquitous and free. There is hardly a single non-lame
programmer who doesn't have it installed. Why irritate an already irritated
user that cares to file bug reports for your half-working thing?

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bearophile_hugs eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #1162|0                           |1
        is obsolete|                            |


--- Comment #7 from bearophile_hugs eml.cc 2012-12-23 13:51:37 PST ---
Created an attachment (id=1172)
The same files in zip archive

(In reply to comment #6)


 That's not funny any more, really. Walter, is it really hard to install 7-zip
 extractor? It is ubiquitous and free. There is hardly a single non-lame
 programmer who doesn't have it installed. Why irritate an already irritated
 user that cares to file bug reports for your half-working thing?


I agree with Walter that Bugzilla entries should have attachments in the most
common and user-friendly formats, like zip, unless the file is huge or there
are special situations. So a 7 kb archive does not justify the usage of a less
common archiver.

On the other hand 7z is an archiver better than zip, and progress in computer
science requires a little of extra work to phase out older technologies to
replace them with newer and better. So today installing a working and free
version of 7z should be considered expected by serious computer users.

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Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrej.mitrovich gmail.com


--- Comment #8 from Andrej Mitrovic <andrej.mitrovich gmail.com> 2012-12-23
13:59:57 PST ---
Please let's not go off-topic.

I can't recreate the linker failure with git-head. I get the obj, lib, map and
exe file with no errors.

This might also be related to Issue 3094, which doesn't have source test-cases
but only object file test-cases. In 3094 linking fails with optlink but it
works with Unilink (minus the missing entry function error which is expected as
none were provided).

Denis do you know which DMD commit you were on when testing this?

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--- Comment #9 from Denis Shelomovskij <verylonglogin.reg gmail.com> 2012-12-24
22:31:26 MSK ---
(In reply to comment #8)

 Please let's not go off-topic.
 
 I can't recreate the linker failure with git-head. I get the obj, lib, map and
 exe file with no errors.
 
 This might also be related to Issue 3094, which doesn't have source test-cases
 but only object file test-cases. In 3094 linking fails with optlink but it
 works with Unilink (minus the missing entry function error which is expected as
 none were provided).
 
 Denis do you know which DMD commit you were on when testing this?


I confirm that test-case links fine with
04cbe5d8a76186d8327c50eb46a02eb5633d7835 but it is only because this is a
"random" failure. Original code (from my hooking project) still fails to link
with the same error. I don't want to reduce my sources every time dmd changes
so you can use e01eb59f842dfe7a5275d96c420691c4a64f57f4 where provided
test-case triggers the bug or find later one using `git bisect`.

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--- Comment #10 from Walter Bright <bugzilla digitalmars.com> 2012-12-25
03:31:43 PST ---
Thank you, bearophile, for uploading the zip.

I can't reproduce a problem, either.

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--- Comment #11 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2012-12-25 20:27:39 MSK ---
(In reply to comment #10)

 Thank you, bearophile, for uploading the zip.
 
 I can't reproduce a problem, either.


Does it mean that it is a problem for you to work with
e01eb59f842dfe7a5275d96c420691c4a64f57f4 instead of HEAD?

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--- Comment #12 from Walter Bright <bugzilla digitalmars.com> 2012-12-26
03:18:19 PST ---
(In reply to comment #11)

 Does it mean that it is a problem for you to work with
 e01eb59f842dfe7a5275d96c420691c4a64f57f4 instead of HEAD?


It works with both HEAD and e01eb59f842dfe7a5275d96c420691c4a64f57f4.

I cannot reproduce this problem.

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--- Comment #13 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2012-12-29 08:18:21 MSK ---
(In reply to comment #12)

 It works with both HEAD and e01eb59f842dfe7a5275d96c420691c4a64f57f4.
 
 I cannot reproduce this problem.


Confirm. Looks like the problem is in my phobos.lib and I can't remember exact
dmd/druntime/phobos commits used to build it.

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--- Comment #14 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2012-12-29 08:23:31 MSK ---
Here is the full testcase (with phobos library file):
http://deoma-cmd.ru/files/other/linker-error-full.zip
(can not upload here because of its size (~1.2 MiB))

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--- Comment #15 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2012-12-29 08:25:24 MSK ---
To disable the issue and make code linkable, you can e.g. remove any line from
`c.d`.

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--- Comment #16 from Andrej Mitrovic <andrej.mitrovich gmail.com> 2013-01-12
20:08:35 PST ---
(In reply to comment #14)

 Here is the full testcase (with phobos library file):
 http://deoma-cmd.ru/files/other/linker-error-full.zip
 (can not upload here because of its size (~1.2 MiB))


Phobos of which commit?

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--- Comment #17 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2013-01-13 10:00:02 MSK ---
(In reply to comment #16)

 Phobos of which commit?


As I wrote in comment 13, I can't remember exact dmd/druntime/phobos commits
used to build it.

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--- Comment #18 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2013-02-17 10:24:50 MSK ---
Created an attachment (id=1189)
Almost unreduced sources

Fails to link on every dmd/druntime/phobos commit I tried. It fails e.g.:
dmd: 8f9ee7b112c644c4c2b830a4f9c79974196e37d5
druntime: 778d91803e49bc1e829f87014e745e75df84d17d
phobos: 6a3ffa5e136d22b31529e6a3688cb8ce3a5508a0

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--- Comment #19 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2013-02-22 10:21:20 MSK ---
Can somebody confirm link failure in the last test case?

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Dmitry Olshansky <dmitry.olsh gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dmitry.olsh gmail.com


--- Comment #20 from Dmitry Olshansky <dmitry.olsh gmail.com> 2013-02-24
20:42:14 PST ---
(In reply to comment #19)

 Can somebody confirm link failure in the last test case?


I can. For me it fails with stock dmd2.062. Here is the complete log:

Compiling xlib.lib...
Compiling x.obj...
Linking...
OPTLINK (R) for Win32  Release 8.00.12
Copyright (C) Digital Mars 1989-2010  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
psapi.lib
 Warning 2: File Not Found psapi.lib
xlib.lib(object)  Offset 0B1ACH Record Type 0091
 Error 1: Previous Definition Different :
_D58C:\dmd2\windows\bin\..\..\src\druntime\import\object.di.4612__ModuleInfoZ
xlib.lib(object)  Offset 0B239H Record Type 00C3
 Error 1: Previous Definition Different :
_D58C:\dmd2\windows\bin\..\..\src\druntime\import\object.di.467__arrayZ
xlib.lib(object)  Offset 0B266H Record Type 00C3
 Error 1: Previous Definition Different :
_D58C:\dmd2\windows\bin\..\..\src\druntime\import\object.di.468__assertFiZv
xlib.lib(object)  Offset 0B293H Record Type 00C3
 Error 1: Previous Definition Different :
_D58C:\dmd2\windows\bin\..\..\src\druntime\import\object.di.4615__unittest_failFiZv
Failed.

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--- Comment #21 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2013-03-11 12:56:43 MSK ---
This is definitely a dmd bug, not OPTLINK as it is also triggered when building
a library (when dmd doesn't call linker).

`f` is a member function of a class:
---
void f()
{
    auto a = asJSON(["type": asJSON(to!string(type))]);
    auto b = asJSON(cycleData.map!(d => toJSON(d.height))().array());
    auto c = asJSON(zip(cycleData, sequence!`a[0] + n`(cast()
creationCycle)).filter!`!a[0].available`().map!(a => asJSON(a[1]))().array());
}
---

If any of 3 `f`'s lines are commented out the library compiles fine into `.lib`
file. Otherwise dmd fails with:
---
xxx.lib: Error: multiple definition of object_32e_f8d:
_D65D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.81412__ModuleInfoZ
and object:
_D65D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.81412__ModuleInfoZ
xxx.lib: Error: multiple definition of object_32e_f8d:
_D65D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.8147__arrayZ
and object:
_D65D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.8147__arrayZ
xxx.lib: Error: multiple definition of object_32e_f8d:
_D65D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.8148__assertFiZv
and object:
_D65D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.8148__assertFiZv
xxx.lib: Error: multiple definition of object_32e_f8d:
_D65D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.81415__unittest_failFiZv
and object:
_D65D:\D\dmd2head\windows\bin\..\..\src\druntime\import\object.di.81415__unittest_failFiZv
---

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Denis Shelomovskij <verylonglogin.reg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Random "Previous Definition |dmd sometimes produces
                   |Different" optlink failure  |object files with multiple
                   |(looks like a buffer        |definitions
                   |overflow bug somewhere)     |
           Severity|regression                  |critical


--- Comment #22 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2013-03-11 13:02:26 MSK ---
Looks like this is not a regression, this bug is triggered from time to time on
the same code because of druntime/phobos changes.

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--- Comment #23 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2013-03-14 18:29:41 MSK ---
Ping.

This is a dmd issue, not OPTLINK one. And the fact it is not a REGRESSION
doesn't mean we should continue releasing dmd with it included as it even worse
than a regression as it is triggered randomly.

Personally I already suffer enough from OPTLINK and the fact dmd also produces
corrupted object files looks too cruel. With all this words about language
stability we have this issue which may accidentally brake build of every code
base on every platform because of a any small code change.

I worked on only two non-toy D executables for the last 6 month and both are
[partially] blocked because of this. For now I abandoned the first project and
have managed to juggle with files to "detrigger" this issue in second one.

So I'm completely missing the point where are these issues with higher priority
than this, abandoned, unvoted one? Probably I'm the most luckless D user who
always suffer from these linking failures...

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--- Comment #24 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2013-04-30 16:07:00 MSD ---
Any plans on fixing this? In my unlucky hands even VisualD's cpp2d fails to
build in debug mode because of the issue...

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Rainer Schuetze <r.sagitario gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |r.sagitario gmx.de


--- Comment #25 from Rainer Schuetze <r.sagitario gmx.de> 2013-05-20 06:13:05
PDT ---
I very much suspect that this is caused by the generated internal object file
names of a library or other generated identifiers that are assumed to be
unique, but clearly this is not guaranteed when building libraries in separate
build steps.

I tried to generate a small test on that suspicion some time ago, but it didn't
trigger a linker error then. I have figured it out now:

////////////////////////
module ab;

struct AB
{
     int a;
    int len() { return (new AB).a; }
}

unittest
{
}

////////////////////////
module ba;

struct BA
{
    int b;
    int len() { return (new BA).b; }
}

unittest
{
}

////////////////////////
import ab;
import ba;

int main()
{
    AB ab;
    BA ba;
    return ab.len() + ba.len();
}
////////////////////////

now building with dmd 2.062:

dmd -lib -of"alib.lib" ab.d
dmd -lib -of"blib.lib" ba.d
dmd -c main.d
dmd main.obj alib.lib blib.lib

yields:

OPTLINK (R) for Win32  Release 8.00.12
Copyright (C) Digital Mars 1989-2010  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
blib.lib(object)  Offset 013AEH Record Type 0091
 Error 1: Previous Definition Different :
_D59c:\l\dmd2\windows\bin\..\..\src\druntime\import\object.di.412__ModuleInfoZ
blib.lib(object)  Offset 0143CH Record Type 00C3
 Error 1: Previous Definition Different :
_D59c:\l\dmd2\windows\bin\..\..\src\druntime\import\object.di.47__arrayZ
blib.lib(object)  Offset 01469H Record Type 00C3
 Error 1: Previous Definition Different :
_D59c:\l\dmd2\windows\bin\..\..\src\druntime\import\object.di.48__assertFiZv
blib.lib(object)  Offset 01496H Record Type 00C3
 Error 1: Previous Definition Different :
_D59c:\l\dmd2\windows\bin\..\..\src\druntime\import\object.di.415__unittest_failFiZv
blib.lib(object)  Offset 00F6EH Record Type 0091
 Error 1: Previous Definition Different :
_D59c:\l\dmd2\windows\bin\..\..\src\druntime\import\object.di.312__ModuleInfoZ
blib.lib(object)  Offset 0103BH Record Type 00C3
 Error 1: Previous Definition Different :
_D59c:\l\dmd2\windows\bin\..\..\src\druntime\import\object.di.37__arrayZ
blib.lib(object)  Offset 01068H Record Type 00C3
 Error 1: Previous Definition Different :
_D59c:\l\dmd2\windows\bin\..\..\src\druntime\import\object.di.38__assertFiZv
blib.lib(object)  Offset 01095H Record Type 00C3
 Error 1: Previous Definition Different :
_D59c:\l\dmd2\windows\bin\..\..\src\druntime\import\object.di.315__unittest_failFiZv

also happens with current git-head.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=9044



--- Comment #26 from Denis Shelomovskij <verylonglogin.reg gmail.com>
2013-05-27 12:07:47 MSD ---
(In reply to comment #25)

 I very much suspect that this is caused by the generated internal object file
 names of a library or other generated identifiers that are assumed to be
 unique, but clearly this is not guaranteed when building libraries in separate
 build steps.


It also fails in dmd (not OPTLINK) when a library is generated using a single
`dmd -lib ...` call (see Comment 21).

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prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=9044


Martin Nowak <code dawg.eu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
                 CC|                            |code dawg.eu
         Resolution|                            |DUPLICATE


--- Comment #27 from Martin Nowak <code dawg.eu> 2013-05-30 08:02:26 PDT ---
*** This issue has been marked as a duplicate of issue 6461 ***

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May 30 2013