Public bug reported:
I get a linker error compiling the following with clang++-3.8
optimization level -O1:
#include <boost/regex.hpp>
int main() {
boost::regex re;
std::string str;
boost::smatch match;
boost::regex_match(str, match, re);
return 0;
}
It works fine with gcc:
$ g++ -O1 -o boost-clang-bug.gcc boost-clang-bug.cpp -lboost_regex
Or with clang -O0:
$ clang++-3.8 -O0 -o boost-clang-bug.o0 boost-clang-bug.cpp
-lboost_regex
But not with clang -O1:
$ clang++-3.8 -O1 -o boost-clang-bug.o1 boost-clang-bug.cpp -lboost_regex
/tmp/boost-clang-bug-64dd61.o: In function
`boost::cpp_regex_traits<char>::transform[abi:cxx11](char const*, char const*)
const':
boost-clang-bug.cpp:(.text._ZNK5boost16cpp_regex_traitsIcE9transformB5cxx11EPKcS3_[_ZNK5boost16cpp_regex_traitsIcE9transformB5cxx11EPKcS3_]+0x23):
undefined reference to
`boost::re_detail::cpp_regex_traits_implementation<char>::transform[abi:cxx11](char
const*, char const*) const'
/tmp/boost-clang-bug-64dd61.o: In function
`boost::cpp_regex_traits<char>::transform_primary[abi:cxx11](char const*, char
const*) const':
boost-clang-bug.cpp:(.text._ZNK5boost16cpp_regex_traitsIcE17transform_primaryB5cxx11EPKcS3_[_ZNK5boost16cpp_regex_traitsIcE17transform_primaryB5cxx11EPKcS3_]+0x23):
undefined reference to
`boost::re_detail::cpp_regex_traits_implementation<char>::transform_primary[abi:cxx11](char
const*, char const*) const'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Instead of giving an error, I would expect clang to successfully compile
and link this program.
I'm using a stock install of xenial (on AWS, ubuntu/images/hvm-ssd
/ubuntu-xenial-16.04-amd64-server-20170113 (ami-7c803d1c)) updating and
installing these:
$ sudo apt-get update
$ sudo apt-get install clang-3.8 libboost-regex1.58 g++
Here's relevant versioning information:
$ lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04
$ apt-cache policy clang-3.8
clang-3.8:
Installed: 1:3.8-2ubuntu4
Candidate: 1:3.8-2ubuntu4
Version table:
*** 1:3.8-2ubuntu4 500
500 http://us-west-2.ec2.archive.ubuntu.com/ubuntu
xenial-updates/universe amd64 Packages
100 /var/lib/dpkg/status
1:3.8-2ubuntu1 500
500 http://us-west-2.ec2.archive.ubuntu.com/ubuntu xenial/universe
amd64 Packages
** Affects: llvm-toolchain-3.8 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1664321
Title:
clang + boost regex + xenial = linker error
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