Public bug reported:
$ cat foo.cc
#include <string>
std::string hello = "Hello, world!\n";
$ cat bar.cc
#include <string>
#include <iostream>
extern std::string hello;
int main() {
std::cout << hello;
return 0;
}
$ g++ -c foo.cc && g++ foo.o bar.cc && ./a.out
Hello, world!
$ clang++ -c foo.cc && clang++ foo.o bar.cc && ./a.out
Hello, world!
$ g++ -c foo.cc && clang++ foo.o bar.cc && ./a.out
/tmp/bar-34fb23.o: In function `main':
bar.cc:(.text+0x14): undefined reference to `hello'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
$ clang++ -c foo.cc && g++ foo.o bar.cc && ./a.out
/tmp/ccqU38Mh.o: In function `main':
bar.cc:(.text+0x5): undefined reference to `hello[abi:cxx11]'
collect2: error: ld returned 1 exit status
In practice, this means that many programs using C++ libraries other
than libstdc++ fail to compile with clang++. For example, mosh fails
with undefined references to google::protobuf::internal::empty_string_,
google::protobuf::MessageLite::InitializationErrorString() const, and
google::protobuf::MessageLite::SerializeAsString() const.
** Affects: llvm
Importance: Unknown
Status: Unknown
** Affects: llvm-toolchain-3.6 (Ubuntu)
Importance: Undecided
Status: New
** Bug watch added: llvm.org/bugs/ #23529
http://llvm.org/bugs/show_bug.cgi?id=23529
** Also affects: llvm via
http://llvm.org/bugs/show_bug.cgi?id=23529
Importance: Unknown
Status: Unknown
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https://bugs.launchpad.net/bugs/1488254
Title:
clang++ no longer ABI-compatible with g++
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