*** This bug is a duplicate of bug 1605291 ***
https://bugs.launchpad.net/bugs/1605291
** This bug has been marked a duplicate of bug 1605291
please merge llvm-toolchain-3.8 from Debian
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https://bugs.launchpad.net/bugs/1606355
Title:
clang 3.8 incompatibility with boost since 15.04
Status in llvm-toolchain-3.8 package in Ubuntu:
New
Bug description:
Since 15.04, people trying to use clang++ as their compiler fail
linking due to different mangling schemes (ABI versions) between
clang-3.8 and g++.
In Ubuntu 16.04 libboost-* packages are all compiled with g++ 5.x.
So trying to use clang++ to link with them fails with undefined
symbols. Here's one example of such error:
./libvw.a(parse_args.o): In function
`boost::program_options::typed_value<unsigned long, char>::name()
const': parse_args.cc:
.text._ZNK5boost15program_options11typed_valueImcE4nameEv[_ZNK5boost15program_options11typed_valueImcE4nameEv]+0x27):
undefined reference to `boost::program_options::arg'
This is a regression. Binaries compiled with clang++ used to be compatible
with binaries compiled with gcc/g++.
All the details can be found in the upstream bug here:
https://llvm.org/bugs/show_bug.cgi?id=23529
A patch was released back in March 23 2016 which so far has been
working well for early testers.
Why this bug should get more attention?
In my experience, clang on 12.04 was about 2x faster than g++ in
compile times and its generated code up to 6% faster than code
generated by the g++ toolchain (for my application, vowpal-wabbit).
So I switched to clang. The moment I upgraded to LTS (16.04) I
discovered I can no longer use clang on Ubuntu. Essentially, the
clang shipped with Ubuntu 16.04 LTS is no longer working with the
shipped boost libraries rendering clang on 16.04 pretty useless.
I'm opening this bug on launchpad to increase visibility into the
problem and help accelerate the integration of this patch into Ubuntu.
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