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[Krzysztof Cieniuch <cieniuch77 AT gmail.com>]

Hi,

I'm using CentOS 6.3, clang version 3.2  with latest ld checked out from 
cvs
I followed instructions on wiki and installed clang with lto (gold plugin)

I'm having troubles compiling this simple program:

#include<string>
#include<map>
#include<iostream>

using namespace std;
int main(int argc,char** argv){
    map<string,int> themap;
    string test(argv[0]);

    themap["key1"]=1;
    cout << test << endl;

    return 0;
}

clang++ -g  -O2 -flto -use-gold-plugin -fmemsafety  -o main main.cc  -L 
/opt/SAFECode/lib

FIXME: Ignoring global of size zero: @_ZNSs4_Rep20_S_empty_rep_storageE 
= external global [0 x i64]
lto-llvm.o-O8q9Q2:ld-temp.o:TargetList: error: undefined reference to 
'std::string::_S_compare(unsigned long, unsigned long)'
lto-llvm.o-O8q9Q2:ld-temp.o:TargetList1: error: undefined reference to 
'std::string::_S_compare(unsigned long, unsigned long)'

If I remove -O2 option it links fine.
What's strange if you comment  out line:  themap["key1"]=1; it will compile.
What even more strange :-) if you comment out:  cout << test << endl; 
instead it will also compile any ideas ?
Is this bug in clang ld or libstdc++ on centos 6.3 or combination of all.

Thanks
Krzysztof