On Tue, Apr 16, 2013 at 11:57:54AM +0200, Andreas Schwab wrote:
> Jakub Jelinek <ja...@redhat.com> writes:
>
> > Why would that be a problem? libgcj.so the linker sees (i.e. the dummy
> > library) doesn't intentionally have DT_NEEDED libgcj.so.N, programs and
> > shared libraries linked with -findirect-dispatch should be adding
> > libgcj_bc.so to DT_NEEDED, not libgcj.so.N.
>
> But the dummy libgcj_bc.so doesn't define _Jv_MonitorExit, or any other
> relevant symbol.
That is not true. Build from yesterday, on x86_64-linux:
$ readelf -Wa libjava/.libs/libgcj_bc.so | grep _Jv_MonitorExit; readelf -d
libjava/.libs/libgcj_bc.so | grep NEEDED; echo ==; readelf -Wa
libjava/.libs/libgcj_bc.so.1 | grep _Jv_MonitorExit; readelf -d
libjava/.libs/libgcj_bc.so.1 | grep NEEDED
25: 0000000000001250 2 FUNC GLOBAL DEFAULT 10 _Jv_MonitorExit
77: 0000000000001250 2 FUNC GLOBAL DEFAULT 10 _Jv_MonitorExit
0x0000000000000001 (NEEDED) Shared library: [libc.so.6]
0x0000000000000001 (NEEDED) Shared library: [libgcc_s.so.1]
==
0x0000000000000001 (NEEDED) Shared library: [libgcj.so.14]
The point of -findirect-dispatch linking against -lgcj_bc rather than -lgcj
is that whenever N in libgcj.so.N is bumped, you don't need to rebuild all the
-findirect-dispatch compiled/linked programs and shared libraries, only if
you build a direct dispatch programs or shared libraries.
So, -findirect-dispatch programs and shared libraries should have:
0x0000000000000001 (NEEDED) Shared library: [libgcj_bc.so.1]
rather than:
0x0000000000000001 (NEEDED) Shared library: [libgcj.so.14]
Jakub
