[llvm-bugs] [Bug 27447] New: [LTO] Symbol lookup error when linking with shared libraries

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Apr 21 10:34:14 PDT 2016


            Bug ID: 27447
           Summary: [LTO] Symbol lookup error when linking with shared
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: davide at freebsd.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

$ cat try.sh
rm -rf main-lld libshlld.so
./clang shared.cpp -o libshlld.so -shared -fPIC -fuse-ld=lld -flto
./clang main.cpp -L. -o main-lld -fuse-ld=lld -flto -lshlld
./main-lld: symbol lookup error: ./libshlld.so: undefined symbol: _ZSt4cout

$ cat main.cpp 
  return (0);
[davide at localhost bin]$ cat shared.cpp 
#include <iostream>
int f();  // forward declaration
int g();  // forward declaration
int x = f();
int y = g();
int f()
  std::cout << "using 'y' (which is " << y << ")\n";
  return 3*y + 7;
int g()
  std::cout << "initializing 'y'\n";
  return 5;

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