library-not-linked-against-libc

["Marcelo E. Magallon" <mmagallo@debian.org>]

Hi,

W: libglew1: library-not-linked-against-libc ./usr/lib/libGLEW.so.1.1.3
N:
N:   The package installs a library which is not dynamically linked against
N:   libc.
N:   
N:   Usually this is a bug. Otherwise, please contact
N:   lintian-maint@debian.org about this so that this exception would be
N:   recognized in future versions of Lintian.
N:

glew-1.1.3$ readelf -s lib/libGLEW.so.1.1.3 | grep UND
     0: 00000000     0 NOTYPE  LOCAL  DEFAULT  UND 
   494: 00000000    81 FUNC    GLOBAL DEFAULT  UND glXQueryExtensionsString
   891: 00000000   114 FUNC    GLOBAL DEFAULT  UND glXGetProcAddressARB
   904: 00000000    59 FUNC    GLOBAL DEFAULT  UND glXQueryVersion
   906: 00000000     0 FUNC    GLOBAL DEFAULT  UND glGetString
     0: 00000000     0 NOTYPE  LOCAL  DEFAULT  UND 
   627: 00000000    81 FUNC    GLOBAL DEFAULT  UND glXQueryExtensionsString
  1024: 00000000   114 FUNC    GLOBAL DEFAULT  UND glXGetProcAddressARB
  1037: 00000000    59 FUNC    GLOBAL DEFAULT  UND glXQueryVersion
  1039: 00000000     0 FUNC    GLOBAL DEFAULT  UND glGetString

glew-1.1.3$ readelf -d lib/libGLEW.so.1.1.3  | grep NEEDED
 0x00000001 (NEEDED)                     Shared library: [libXmu.so.6]
 0x00000001 (NEEDED)                     Shared library: [libXi.so.6]
 0x00000001 (NEEDED)                     Shared library: [libGLU.so.1]
 0x00000001 (NEEDED)                     Shared library: [libGL.so.1]
 0x00000001 (NEEDED)                     Shared library: [libXext.so.6]
 0x00000001 (NEEDED)                     Shared library: [libX11.so.6]

 do tell me why I need to link against libc.  If lintian is trying to
 figure out if a library lacks interlibrary dependency information, it
 should look if there are no NEEDED tags in the dynamic section.
 Otherwise I fail to see what the problem is.

 Looking at the check that outputs this warning, It's really scary:

        my $lib;
        my $no_libc = 1;
        $needs_depends_line = 1;
        @needed = @{$NEEDED{$file}};
        for $lib (@needed) {
            # linked against libc5?
            if ($lib =~ m/^libc\.so\.5/o) {
                           ^^^^^^^^^^^
                           what if there's a library libc.so.50?
                           we are a bit too eager to use regexes, aren't
                           we?
                # yes.
                # libc5-compat ?
                if (($file =~ m/libc5-compat/) or
                    ($file =~ m/i486-linuxlibc1/)) {
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                    Make that $file =~ m/^(:?libc5-compat|i486-linuxlibc1)\b/
                    or better

                    my %compat_libc = map { $_ => 1 } qw/libc5-compat i486-linuxlibc1/;
                    ...
                    next if exists $compat_libc{$file};

                    # ok, ignore it
                } else {
                    print "W: $pkg $type: libc5-binary $file\n" unless $libc5_bi
nary{$file}++;
                }
            }

            if ($lib =~ m/^libc/o) {
                           ^^^^
                           what about the other 200+ libraries matching
                           ^libc, hmm?
                $no_libc = 0;
            }
        }

        if ($no_libc and not $file =~ m,/libc\b,) {
                                         ^^^^^^
                                         not to mention a handful of
                                         library packages that match
                                         this
            if ($info =~ m/shared object/) {
                print "W: $pkg $type: library-not-linked-against-libc $file\n";
            } else {
                print "W: $pkg $type: program-not-linked-against-libc $file\n";
            }
        }

 Cheers,

-- 
Marcelo