[Bug gold/19393] New: --gc-sections fails to discard orphaned undefined dynamic symbols

[sourceware at mattwhitlock dot name]

https://sourceware.org/bugzilla/show_bug.cgi?id=19393

            Bug ID: 19393
           Summary: --gc-sections fails to discard orphaned undefined
                    dynamic symbols
           Product: binutils
           Version: 2.25
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gold
          Assignee: ccoutant at gmail dot com
          Reporter: sourceware at mattwhitlock dot name
                CC: ian at airs dot com
  Target Milestone: ---

When garbage collecting function sections, Gold fails to discard undefined
dynamic symbols that become unreferenced/orphaned as a result of the garbage
collection. The BFD linker does this correctly.

A very simple test case demonstrating the problem:

$ cat test.c

#include <unistd.h>
void unused() {
        close(0);
}
int main() {
        return 0;
}

$ ld.gold --version | head -n1
GNU gold (Gentoo 2.25.1 p1.1 2.25.1) 1.11
$ gcc -ffunction-sections -Wl,--gc-sections,-fuse-ld=gold -o test test.c
$ nm test | fgrep -c close
1

$ ld.bfd --version | head -n1
GNU ld (Gentoo 2.25.1 p1.1) 2.25.1
$ gcc -ffunction-sections -Wl,--gc-sections,-fuse-ld=bfd -o test test.c
$ nm test | fgrep -c close
0

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