[Bug ld/24836] New: --as-needed leaves unused direct dependencies

[crusader.mike at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24836

            Bug ID: 24836
           Summary: --as-needed leaves unused direct dependencies
           Product: binutils
           Version: 2.30
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: crusader.mike at gmail dot com
  Target Milestone: ---

I have a binary that is linked like this:

/opt/rh/devtoolset-8/root/usr/bin/g++
-O3 -DNDEBUG  -Wl,--gc-sections -s -Wl,--as-needed
<few .o files>
-o procmon.e
-Wl,-rpath,/usr/local/lib64
<bunch of my static libs .a>
/usr/local/lib64/libxalan-c.so
/usr/local/lib64/libxerces-c.so
<bunch of static libs(1) built with "vcpkg" intermixed with (2)>

(1) curl z aws-cpp-sdk-s3 aws-cpp-sdk-core ssl crypto aws-c-event-stream
aws-c-common aws-checksums
    azurestorage uuid xml2 zma cpprest boost_log boost_log_setup
boost_filesystem boost_thread boost_date_time
    boost_regex boost_chrono boost_atomic

(2) -lcrypt -lrt -lm -ldl -pthread


but (even though --as-needed is present) ldd still reports unused dependencies:

$ ldd -u -r procmon.e
Unused direct dependencies:
        /usr/local/lib64/libxalan-c.so.111
        /lib64/libcrypt.so.1
        /lib64/libm.so.6

Info:
CentOS 7
g++ (GCC) 8.2.1 20180905 (Red Hat 8.2.1-3)
GNU ld version 2.30-47.el7

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