[Bug libc/21488] New: ldd --unused seems to have opposite from stated behavior

["razi at google dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21488

            Bug ID: 21488
           Summary: ldd --unused seems to have opposite from stated
                    behavior
           Product: glibc
           Version: 2.26
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: razi at google dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Hi,

ldd -u (--unused) should "print unused direct dependencies". Running ldd -u on
an example binary claims to print list of "unused direct dependencies". 

However, this list coincides exactly with objdump -p <binary > | grep NEEDED,
which makes me think that it is printing the list of actual direct
dependencies, as opposed to its complement. 

See below:

$ ldd --unused static-build/linux-generic-amd64/wkhtmltox/bin/wkhtmltopdf
Unused direct dependencies:
        /usr/lib/x86_64-linux-gnu/libXrender.so.1
        /usr/lib/x86_64-linux-gnu/libfontconfig.so.1
        /usr/lib/x86_64-linux-gnu/libfreetype.so.6
        /usr/lib/x86_64-linux-gnu/libXext.so.6
        /usr/lib/x86_64-linux-gnu/libX11.so.6
        /lib/x86_64-linux-gnu/libdl.so.2
        /lib/x86_64-linux-gnu/librt.so.1
        /lib/x86_64-linux-gnu/libm.so.6
        /lib/x86_64-linux-gnu/libgcc_s.so.1
        /lib64/ld-linux-x86-64.so.2


$ objdump -p static-build/linux-generic-amd64/wkhtmltox/bin/wkhtmltopdf | grep
NEEDED
  NEEDED               libXrender.so.1
  NEEDED               libfontconfig.so.1
  NEEDED               libfreetype.so.6
  NEEDED               libXext.so.6
  NEEDED               libX11.so.6
  NEEDED               libdl.so.2
  NEEDED               librt.so.1
  NEEDED               libpthread.so.0
  NEEDED               libstdc++.so.6
  NEEDED               libm.so.6
  NEEDED               libgcc_s.so.1
  NEEDED               libc.so.6
  NEEDED               ld-linux-x86-64.so.2


<http://man7.org/linux/man-pages/man1/ldd.1.html>

-- 
You are receiving this mail because:
You are on the CC list for the bug.