[LLVMbugs] [Bug 21693] New: libLTO opportunistically links unused libraries (libedit, libncurses, libffi)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21693

            Bug ID: 21693
           Summary: libLTO opportunistically links unused libraries
                    (libedit, libncurses, libffi)
           Product: tools
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: lto
          Assignee: unassignedbugs at nondot.org
          Reporter: jeremyhu at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

$ otool -L llvm-3.6/lib/libLTO.dylib 
llvm-3.6/lib/libLTO.dylib:
    /opt/local/libexec/llvm-3.6/lib/libLTO.dylib (compatibility version 0.0.0,
current version 0.0.0)
    /opt/local/libexec/llvm-3.6/lib/libLLVM-3.6svn.dylib (compatibility version
0.0.0, current version 0.0.0)
    /opt/local/lib/libz.1.dylib (compatibility version 1.0.0, current version
1.2.8)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version
1213.0.0)
    /opt/local/lib/libffi.6.dylib (compatibility version 7.0.0, current version
7.4.0)
    /opt/local/lib/libedit.0.dylib (compatibility version 1.0.0, current
version 1.51.0)
    /opt/local/lib/libncurses.5.dylib (compatibility version 5.0.0, current
version 5.0.0)
    /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version
120.0.0)

but nm -m shows that only symbols from libLLVM, libSystem, and libc++ are used.
 The other links are unnecessary.

Looking back at what I have on this system, this has been the case for quite
some time.  The oldest libLTO that I have is from 3.3, and it pulls in zlib and
libffi (but libedit and ncurses cam in some time more recently).

$ otool -L llvm-3.3/lib/libLTO.dylib 
llvm-3.3/lib/libLTO.dylib:
    /opt/local/libexec/llvm-3.3/lib/libLTO.dylib (compatibility version 0.0.0,
current version 0.0.0)
    /opt/local/libexec/llvm-3.3/lib/libLLVM-3.3.dylib (compatibility version
0.0.0, current version 0.0.0)
    /opt/local/lib/libz.1.dylib (compatibility version 1.0.0, current version
1.2.8)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version
1213.0.0)
    /opt/local/lib/libffi.6.dylib (compatibility version 7.0.0, current version
7.2.0)
    /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version
120.0.0)

These are built via MacPorts on OSX.

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