llvm dev - May 2018 - Miscompilation while switching from clang-4 to clang-5

Hello everyone,

I observe a weird behavior switching from clang-4 to clang-5 (and any higher
version).
I compile an executable that depends on LLVM. Everything works fine with
clang-4, but when I run the executable compiled with clang-5 I see the following
error:
: CommandLine Error: Option 'rewrite-map-file' registered more than
once!
LLVM ERROR: inconsistency in registered CommandLine options

I want to debug the problem, but don't even know where to start.
I am happy to provide more info if anyone wants to participate.

I would appreciate any hints.

Thank you.
Alex.
--
AlexDenisov
Software Engineer, https://lowlevelbits.org
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 488 bytes
Desc: Message signed with OpenPGP
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20180530/fcbbd73d/attachment.sig>

An LLVM library (in this case:
https://github.com/llvm-mirror/llvm/blob/master/lib/Transforms/Utils/SymbolRewriter.cpp#L91
from LLVMTransformUtils) is linked into the address space more than
once. For instance, a statically linked and a dynamically linked
version.

Michael


2018-05-30 16:39 GMT-05:00 Alex Denisov via llvm-dev <llvm-dev at
lists.llvm.org>:
> Hello everyone,
>
> I observe a weird behavior switching from clang-4 to clang-5 (and any
higher version).
> I compile an executable that depends on LLVM. Everything works fine with
clang-4, but when I run the executable compiled with clang-5 I see the following
error:
> : CommandLine Error: Option 'rewrite-map-file' registered more than
once!
> LLVM ERROR: inconsistency in registered CommandLine options
>
> I want to debug the problem, but don't even know where to start.
> I am happy to provide more info if anyone wants to participate.
>
> I would appreciate any hints.
>
> Thank you.
> Alex.
> --
> AlexDenisov
> Software Engineer, https://lowlevelbits.org
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>

On 05/30/2018 02:39 PM, Alex Denisov via llvm-dev wrote:
> Hello everyone,
> 
> I observe a weird behavior switching from clang-4 to clang-5 (and any
higher version).
> I compile an executable that depends on LLVM. Everything works fine with
clang-4, but when I run the executable compiled with clang-5 I see the following
error:
> : CommandLine Error: Option 'rewrite-map-file' registered more than
once!
> LLVM ERROR: inconsistency in registered CommandLine options
> 
This usually indicates an issue with how you link your application.
Two causes of this would be your application is linked against 2 different
versions of LLVM or your are linking against the llvm static libraries and
also libLLVM.so.

-Tom
> I want to debug the problem, but don't even know where to start.
> I am happy to provide more info if anyone wants to participate.
> 
> I would appreciate any hints.
> 
> Thank you.
> Alex.
> --
> AlexDenisov
> Software Engineer, https://lowlevelbits.org
> 
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>

Hi Tom, hi Michael,

Thank you for your help.
I understand the linking problem. What I do not understand is how to debug the
difference between two versions of compilers.
This what I do (briefly):

clang++-4 foobar.cpp -lLLVM -l/opt/llvm-3.9/lib

clang++-5 foobar.cpp -lLLVM -l/opt/llvm-3.9/lib

The first command produces a working executable, while the other one does not.
I'm trying to understand whether I had this problem all the time but clang-4
could not see it, or there is no problem but clang-5 does something wrong.
> On 30. May 2018, at 23:59, Tom Stellard <tstellar at redhat.com>
wrote:
> 
> On 05/30/2018 02:39 PM, Alex Denisov via llvm-dev wrote:
>> Hello everyone,
>> 
>> I observe a weird behavior switching from clang-4 to clang-5 (and any
higher version).
>> I compile an executable that depends on LLVM. Everything works fine
with clang-4, but when I run the executable compiled with clang-5 I see the
following error:
>> : CommandLine Error: Option 'rewrite-map-file' registered more
than once!
>> LLVM ERROR: inconsistency in registered CommandLine options
>> 
> 
> This usually indicates an issue with how you link your application.
> Two causes of this would be your application is linked against 2 different
> versions of LLVM or your are linking against the llvm static libraries and
> also libLLVM.so.
> 
> -Tom
> 
>> I want to debug the problem, but don't even know where to start.
>> I am happy to provide more info if anyone wants to participate.
>> 
>> I would appreciate any hints.
>> 
>> Thank you.
>> Alex.
>> --
>> AlexDenisov
>> Software Engineer, https://lowlevelbits.org
>> 
>> 
>> 
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>> 
> 
> 
> 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 488 bytes
Desc: Message signed with OpenPGP
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20180531/1671cd6d/attachment-0001.sig>