Debian Bug report logs - #797917
clang should use the new CXX11_ABI

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Danny Edel <debian@danny-edel.de>

To: submit@bugs.debian.org

Subject: libboost-program-options-dev: clang++: undefined reference to boost::program_options::arg

Date: Thu, 3 Sep 2015 19:06:06 +0200

[Message part 1 (text/plain, inline)]

Package: libboost-program-options-dev
Version: 1.58.0.1

Dear maintainer,

I cannot link against recent boost_program_options with clang++, while
it works fine with g++. I have attached a small test program that
demonstrates the bug.

$ g++ -o options options.cpp -lboost_program_options
$ ./options --filename asdf
Filename is asdf
(No problem, works as intended)

$ clang++ -o options options.cpp -lboost_program_options

/tmp/options-18b2b2.o: In function
`boost::program_options::typed_value<std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> >, char>::name() const':

options.cpp:(.text._ZNK5boost15program_options11typed_valueINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEcE4nameEv[_ZNK5boost15program_options11typed_valueINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEcE4nameEv]+0x4c):
undefined reference to `boost::program_options::arg'

clang: error: linker command failed with exit code 1 (use -v to see
invocation)


I believe this is because the symbol is only exported using the new
[abi:cxx11] which apparently g++ understands but clang++ doesn't.

$ nm -D /usr/lib/x86_64-linux-gnu/libboost_program_options.so | c++filt
| grep boost::program_options::arg
000000000027d920 B boost::program_options::arg[abi:cxx11]


I am running debian sid, so these should be quite recent versions:

$ g++ --version
g++ (Debian 5.2.1-15) 5.2.1 20150808

$ clang++ --version
Debian clang version 3.5.2-2 (tags/RELEASE_352/final) (based on LLVM 3.5.2)

I also tested with clang-3.8 package, same results (undefined reference
to boost::program_options::arg)

$ clang++-3.8 --version
Debian clang version 3.8.0-svn245286-1 (trunk) (based on LLVM 3.8.0)


Is it possible to compile boost_program_options (and possibly other
not-pure-header-parts of boost) in a dual-abi way, so that Clang can
link to it aswell? Or did I miss a flag on calling clang as a user?


On a jessie VM, the above commands work as expected, so from a user
perspective, this is a regression. I'm not sure whether this is a boost
or a clang issue, please redirect if I reported against the wrong package.


Thank you,

- Danny

[options.cpp (text/x-c++src, attachment)]

Message #10 received at 797917@bugs.debian.org (full text, mbox, reply):

From: Gianfranco Costamagna <costamagnagianfranco@yahoo.it>

To: "797917@bugs.debian.org" <797917@bugs.debian.org>

Subject: Actually this bug makes clang not so useful

Date: Thu, 3 Sep 2015 17:45:27 +0000 (UTC)

Control: reassign -1 clang-3.5
Control: retitle -1 clang should use the new CXX11_ABI
Control: severity -1 serious

Well this bug makes clang almost useless with the new gcc compiler.

according to [1] there might be no fix.

I hope somebody with more knowledge can come up with a fix, -D_GLIBCXX_USE_CXX11_ABI
seems to be not working



[1] http://clang-developers.42468.n3.nabble.com/GCC-5-1-ABI-GLIBCXX-USE-CXX11-ABI-td4045387.html
cheers,

G.

Message #23 received at 797917@bugs.debian.org (full text, mbox, reply):

From: Danny Edel <debian@danny-edel.de>

To: 797917@bugs.debian.org

Subject: Re: Actually this bug makes clang not so useful

Date: Thu, 3 Sep 2015 23:48:27 +0200

On Thu, 3 Sep 2015 17:45:27 +0000 (UTC) Gianfranco Costamagna
<costamagnagianfranco@yahoo.it> wrote:
> according to [1] there might be no fix.
> 

This may not be a permanent fix, but Debian could take up the "dual-abi"
idea that gcc upstream does with their libstdc++.so.6.

Example:

$ nm -D /usr/lib/x86_64-linux-gnu/libstdc++.so.6 | c++filt | grep
std::locale::name
000000000009e300 T std::locale::name[abi:cxx11]() const
00000000000b8900 T std::locale::name() const

For reference, the un-beautified symbol names are

000000000009e300 T _ZNKSt6locale4nameB5cxx11Ev
00000000000b8900 T _ZNKSt6locale4nameEv


The symbol is exported twice, once with the new ABI and once with the
old. If someone™ figured out how to make the gcc compiler do that, boost
(and other libraries') maintainers could adapt those flags when
compiling with gcc, so we don't generate a vendor lock-in.

If we could make those "Dual-ABI compile flags" the default on
gcc-compiled libraries, clang upstream should have enough time
implementing [abi:cxx11] and remain usable in Debian.

- Danny

Message #28 received at 797917@bugs.debian.org (full text, mbox, reply):

From: Gianfranco Costamagna <costamagnagianfranco@yahoo.it>

To: 797917@bugs.debian.org, doko@debian.org

Subject: Re: Actually this bug makes clang not so useful

Date: Fri, 4 Sep 2015 11:23:10 +0200

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Hi Danny,

> If we could make those "Dual-ABI compile flags" the default on 
> gcc-compiled libraries, clang upstream should have enough time 
> implementing [abi:cxx11] and remain usable in Debian.


gcc had the dual ABI enabled.

but it got disable in the experimental/unstable uploads:
https://packages.qa.debian.org/g/gcc-5/news/20150616T170514Z.html

I guess clang is not useful for cxx11 projects until llvm folks finds
a way to make it use the new ABI.

sorry, but I don't see how to fix this, for sure enabling again the
dual ABI in gcc (not even sure if it will work), is a no-go, because
I'm pretty sure it will trigger another painful transition.

I'm sorry but we should live with this, until llvm folks implemtents
the new code.

Sylvestre, doko, what is your opinion?

cheers,

G.
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Message #33 received at 797917@bugs.debian.org (full text, mbox, reply):

From: Danny Edel <debian@danny-edel.de>

To: Gianfranco Costamagna <costamagnagianfranco@yahoo.it>, 797917@bugs.debian.org

Subject: Re: Bug#797917: Actually this bug makes clang not so useful

Date: Sun, 6 Sep 2015 17:02:01 +0200

On 04/09/15 11:23, Gianfranco Costamagna wrote:
> 
> I guess clang is not useful for cxx11 projects until llvm folks finds
> a way to make it use the new ABI.
> 

Hi everyone,

I just want to make clear that this is *not* specific to c++11 projects.
Even if you don't use any c++11 features, clang can't link against the
library.

Try compiling my example code (which is valid c++98) with

$ g++ -std=c++98 -o options options.cpp -lboost_program_options
$ clang++ -std=c++98 -o options options.cpp -lboost_program_options

The results are the same - works on gcc, fails to link on clang on sid,
while both commands used to work on stable.

If I understand the consequences of this failure right, this will
severely impact the usefulness of clang++, since it will start failing
to link against *any* c++ library compiled by recent g++, breaking
unchanged and valid user code - be it c++11, c++03 or c++98.

I don't think this is that much of an issue on sid - after all, it's
called "unstable" for a reason - but it might be a showstopper for
stable, if clang++ is to be an alternative for g++.

- Danny

Message #38 received at 797917@bugs.debian.org (full text, mbox, reply):

From: Gianfranco Costamagna <costamagnagianfranco@yahoo.it>

To: Danny Edel <debian@danny-edel.de>, "797917@bugs.debian.org" <797917@bugs.debian.org>

Subject: Re: Bug#797917: Actually this bug makes clang not so useful

Date: Mon, 7 Sep 2015 07:00:57 +0000 (UTC)

Hi Danny,

>$ g++ -std=c++98 -o options options.cpp -lboost_program_options
>$ clang++ -std=c++98 -o options options.cpp -lboost_program_options



the fact  is that even if your code is not directly using c++11 symbols,
the underlying libraries (boost_program_options in this case) are, so you
can't mix both old and new ABI.

objdump -T /usr/lib/x86_64-linux-gnu/libboost_program_options.so |grep cxx
echo "_ZN5boost9from_utf8ERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE" |c++filt 
boost::from_utf8(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)


so yes, you can't use boost, until clang gets ported to a new c++11 ABI.

cheers,

G.

Message #45 received at 797917@bugs.debian.org (full text, mbox, reply):

From: Stefan Bühler <source@stbuehler.de>

To: 797917@bugs.debian.org

Subject: Re: clang should use the new CXX11_ABI

Date: Sun, 27 Sep 2015 15:29:51 +0200

Control: forwarded -1 https://llvm.org/bugs/show_bug.cgi?id=23529
Control: found -1 clang-3.4/1:3.4.2-15
Control: found -1 clang-3.6/1:3.6.2-1
Control: found -1 clang-3.7/1:3.7-2
Control: found -1 clang-3.8/1:3.8~svn247576-1

Hi,

I've been trying to fix this, see the upstream bug report and
http://reviews.llvm.org/D12834

Some clarifications:

The dual ABI in libstdc++ is *enabled*, so linking libstdc++ should
work fine with clang++ -D_GLIBCXX_USE_CXX11_ABI=0

The problem is with other c++ libraries which provide interfaces based
on the new libstdc++ ABI (for example by using std::string). I don't
think there is any library apart from libstdc++ out there providing
dual ABI (and I don't think it is trivial to add, as you need separate
translation units afaik); instead they are now all build against the
new ABI.

The main source of incompatibilities is:
- functions returning an "abi_tag"ged type, like ``std::string
  getName()``
- global variables with "abi_tag"ged type (global as in "needs a
  symbols visible in all translation units". static variables in inline
  functions might not trigger a linker error, but are broken anyway)

regards,
Stefan

PS: g++-4.9 doesn't work either.

Message #74 received at 797917@bugs.debian.org (full text, mbox, reply):

From: Danny Edel <debian@danny-edel.de>

To: 797917@bugs.debian.org

Subject: Porting the patch to debian?

Date: Mon, 13 Jun 2016 15:05:00 +0200

Hi,

I would like to try one of the patches from upstream, but I can't figure
out how to apply them to the sourcecode I grab with "apt-get source
clang-<version>".

In particular, neither the patch from
https://llvm.org/bugs/attachment.cgi?id=14874 nor the newer one from
http://reviews.llvm.org/D18035?download=true applies (quilt import ->
quilt push dies with "can't find file to patch").

Could someone help me by porting that patch against the Debian version
of clang, or even by uploading a patched version to experimental?  I
would gladly test and provide feedback, right now clang is near-unusable
since pretty much every c++ library in Debian uses those abi tags.

Thank you in advance,
	Danny

Message #77 received at 797038-close@bugs.debian.org (full text, mbox, reply):

From: Sylvestre Ledru <sylvestre@debian.org>

To: 797038-close@bugs.debian.org

Subject: Bug#797038: fixed in llvm-toolchain-3.8 1:3.8.1-6

Date: Thu, 04 Aug 2016 22:01:17 +0000

Source: llvm-toolchain-3.8
Source-Version: 1:3.8.1-6

We believe that the bug you reported is fixed in the latest version of
llvm-toolchain-3.8, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 797038@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Sylvestre Ledru <sylvestre@debian.org> (supplier of updated llvm-toolchain-3.8 package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Thu, 28 Jul 2016 11:15:04 +0200
Source: llvm-toolchain-3.8
Binary: clang-3.8 clang-format-3.8 clang-tidy-3.8 clang-3.8-doc libclang1-3.8 libclang1-3.8-dbg libclang-3.8-dev libclang-common-3.8-dev libfuzzer-3.8-dev python-clang-3.8 clang-3.8-examples libllvm3.8 libllvm3.8-dbg llvm-3.8 llvm-3.8-runtime llvm-3.8-dev llvm-3.8-tools libllvm-3.8-ocaml-dev llvm-3.8-doc llvm-3.8-examples lldb-3.8 liblldb-3.8 liblldb-3.8-dbg python-lldb-3.8 liblldb-3.8-dev lldb-3.8-dev
Architecture: source amd64 all
Version: 1:3.8.1-6
Distribution: unstable
Urgency: medium
Maintainer: LLVM Packaging Team <pkg-llvm-team@lists.alioth.debian.org>
Changed-By: Sylvestre Ledru <sylvestre@debian.org>
Description:
 clang-3.8  - C, C++ and Objective-C compiler (LLVM based)
 clang-3.8-doc - C, C++ and Objective-C compiler (LLVM based) - Documentation
 clang-3.8-examples - Clang examples
 clang-format-3.8 - Tool to format C/C++/Obj-C code
 clang-tidy-3.8 - clang-based C++ linter tool
 libclang-3.8-dev - clang library - Development package
 libclang-common-3.8-dev - clang library - Common development package
 libclang1-3.8 - C interface to the clang library
 libclang1-3.8-dbg - clang library
 libfuzzer-3.8-dev - Library for coverage-guided fuzz testing
 liblldb-3.8 - Next generation, high-performance debugger, library
 liblldb-3.8-dbg - Next generation, high-performance debugger, debugging libraries
 liblldb-3.8-dev - Next generation, high-performance debugger - Header files
 libllvm-3.8-ocaml-dev - Modular compiler and toolchain technologies, OCaml bindings
 libllvm3.8 - Modular compiler and toolchain technologies, runtime library
 libllvm3.8-dbg - Modular compiler and toolchain technologies, debugging libraries
 lldb-3.8   - Next generation, high-performance debugger
 lldb-3.8-dev - transitional dummy package to liblldb-3.8-dev
 llvm-3.8   - Modular compiler and toolchain technologies
 llvm-3.8-dev - Modular compiler and toolchain technologies, libraries and header
 llvm-3.8-doc - Modular compiler and toolchain technologies, documentation
 llvm-3.8-examples - Modular compiler and toolchain technologies, examples
 llvm-3.8-runtime - Modular compiler and toolchain technologies, IR interpreter
 llvm-3.8-tools - Modular compiler and toolchain technologies, tools
 python-clang-3.8 - Clang Python Bindings
 python-lldb-3.8 - Next generation, high-performance debugger, python lib
Closes: 797038 820159
Changes:
 llvm-toolchain-3.8 (1:3.8.1-6) unstable; urgency=medium
 .
   * Ship libFuzzer in its own package (libfuzzer-X.Y-dev) (Closes: #820159)
   * Sync from Ubuntu. Many thanks to Matthias Klose
     - drop-avx512-from-skylake.diff: Don't enable AVX512 on Skylake, as it's
       a server cpu feature and breaks llvmpipe on workstations.
     - Remove the build tree before calling dh_strip; at least the amd64 buildd
       runs out of diskspace at this step.
     - Add support for gcc's attribute abi_tag (needed for compatibility with
       GCC 5's libstdc++); taken from the trunk (Closes: #797038)
       (LP: #1510042, #1488254)
       D17567-PR23529-Sema-part-of-attrbute-abi_tag-support.diff
       D18035-PR23529-Mangler-part-of-attrbute-abi_tag-support.diff
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Files:
 34f7d31a66c7554450751ef759765bcf 6069 devel optional llvm-toolchain-3.8_3.8.1-6.dsc
 5d776ae68984a2a0f2d07142d5b1cf4b 62308 devel optional llvm-toolchain-3.8_3.8.1-6.debian.tar.xz
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 65df9b9ebf0745c7a1f7705a7fabc434 579868 doc optional clang-3.8-doc_3.8.1-6_all.deb
 405aa86d991fda9041fabe2c24a41ef4 26100 doc optional clang-3.8-examples_3.8.1-6_amd64.deb
 8e810ac2295c6b98b2d6459e973e6333 21302280 devel optional clang-3.8_3.8.1-6_amd64.deb
 7cede6d1d87e10ffcf0126746f3f6035 1574856 debug extra clang-format-3.8-dbgsym_3.8.1-6_amd64.deb
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 4137d57ae3ce20bd6f9e198e514773d1 41433332 debug extra clang-tidy-3.8-dbgsym_3.8.1-6_amd64.deb
 26cdded8d1a9b0515782d8e76dd90885 5029892 devel optional clang-tidy-3.8_3.8.1-6_amd64.deb
 c453234b79f80d23977cb6f3245b2d1b 13056840 libdevel optional libclang-3.8-dev_3.8.1-6_amd64.deb
 acbcd3c020dd393476fd56a0517e81e0 1834456 debug extra libclang-common-3.8-dev-dbgsym_3.8.1-6_amd64.deb
 29b997eef08f9f105adbec7d46748f52 1479578 libdevel optional libclang-common-3.8-dev_3.8.1-6_amd64.deb
 ab9e7ac9445ca8dcbbcb51124e29f796 25842534 debug extra libclang1-3.8-dbg_3.8.1-6_amd64.deb
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 5b49356cfae7cdab218c077efae5ef75 71218 libdevel optional libfuzzer-3.8-dev_3.8.1-6_amd64.deb
 b594c5351e5e6de63fb8df9643d2d08f 73089682 debug extra liblldb-3.8-dbg_3.8.1-6_amd64.deb
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 7e57845682d7e4baca75ebeb8ed91bb1 15314664 libs optional liblldb-3.8_3.8.1-6_amd64.deb
 74c0e57e3c1b425a95dc658990f6cec3 19602 ocaml optional libllvm-3.8-ocaml-dev_3.8.1-6_amd64.deb
 f1657bc6ec6906e1e0c5fc013098a45b 46734580 debug extra libllvm3.8-dbg_3.8.1-6_amd64.deb
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 6f835bc888ef53f2fd2c6657872327f5 18806 oldlibs optional lldb-3.8-dev_3.8.1-6_all.deb
 96ac3553f445439298c087840875e744 7766086 devel optional lldb-3.8_3.8.1-6_amd64.deb
 7ed691a1e6cf8387aabf2c7f733f1fd8 4990334 debug extra llvm-3.8-dbgsym_3.8.1-6_amd64.deb
 a4b61b073abbfeedb79090ba83eac98f 3953896 debug extra llvm-3.8-dev-dbgsym_3.8.1-6_amd64.deb
 6ab1d3d253974a53d118e30f9bf2c4e0 16360184 devel optional llvm-3.8-dev_3.8.1-6_amd64.deb
 02bd38ee25f1d0af10a2444a7ff666cc 1507406 doc optional llvm-3.8-doc_3.8.1-6_all.deb
 775a6bdfd2af3d8724114b86317bb768 230010 doc optional llvm-3.8-examples_3.8.1-6_all.deb
 82a63d5dd0334f609ab3a9e383b2ef78 241944 debug extra llvm-3.8-runtime-dbgsym_3.8.1-6_amd64.deb
 fc79d83d7af04c77206ba44ee6bdafe1 84554 devel optional llvm-3.8-runtime_3.8.1-6_amd64.deb
 6b6beb5b5e9f8672aa0483622c633bc5 510740 debug extra llvm-3.8-tools-dbgsym_3.8.1-6_amd64.deb
 edec44b1b2b6fd1c4382a0c2f2bee012 172510 devel optional llvm-3.8-tools_3.8.1-6_amd64.deb
 7fa19b9eed9a143ffffdd53617b234ec 1523426 devel optional llvm-3.8_3.8.1-6_amd64.deb
 4eed4da8aa9e33c7fd9da76bc3aae51b 41472 python optional python-clang-3.8_3.8.1-6_amd64.deb
 a0f14eaed2d76bef8c19ff91c7239389 105066 python optional python-lldb-3.8_3.8.1-6_amd64.deb

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