[Bug ld/18992] New: Linking a library implicitly using relative DT_RPATH does not work

[sourceware-bugzilla at jbeekman dot nl]

https://sourceware.org/bugzilla/show_bug.cgi?id=18992

            Bug ID: 18992
           Summary: Linking a library implicitly using relative DT_RPATH
                    does not work
           Product: binutils
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: sourceware-bugzilla at jbeekman dot nl
  Target Milestone: ---

I have a shared library ./dir/liba.so and a shared library ./libb.so with
DT_RPATH "dir" and DT_NEEDED "liba.so". Now, if I compile an executable with
-L. -lb, I get: "warning: liba.so, needed by ./libb.so, not found (try using
-rpath or -rpath-link)". It works when using an absolute DT_RPATH or when using
gold. The resulting binary works with a relative RPATH.

Here's a test case:

===> a.c <===

void a() {}

===> b.c <===

extern void a();
void b() {a();}

===> main.c <===

extern void b();
void main() {b();}

$ mkdir dir
$ gcc -fPIC -shared a.c -o dir/liba.so
# Make libb with relative RPATH
$ gcc -fPIC -shared -Ldir -Wl,-rpath,dir b.c -la -o libb.so
# Fail linking in relative-RPATH libb with ld.bfd
$ gcc main.c -L. -Wl,-rpath,. -lb -o main
/usr/bin/ld.bfd.real: warning: liba.so, needed by ./libb.so, not found (try
using -rpath or -rpath-link)
./libb.so: undefined reference to `a'
collect2: error: ld returned 1 exit status
# Succeed linking in relative-RPATH libb with gold
$ gcc main.c -fuse-ld=gold -L. -Wl,-rpath,. -lb -o main
# Run binary with relative-RPATH libb
$ ./main
# Make libb with absolute RPATH
$ gcc -fPIC -shared -Ldir -Wl,-rpath,$(pwd)/dir b.c -la -o libb.so
# Succeed linking in absolute-RPATH libb with ld.bfd
$ gcc main.c -L. -Wl,-rpath,. -lb -o main
# Run binary with absolute-RPATH libb
$ ./main
# Make libb with relative RPATH
$ gcc -fPIC -shared -Ldir -Wl,-rpath,dir b.c -la -o libb.so
# Run binary with relative-RPATH libb
$ ./main

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