prelink -u on aarch64 question

prelink -u on aarch64 question

[Steve Ellcey]

I was wondering if anyone could tell me anything about prelink on
aarch64? I am looking at a gdb test run on my aarch64 ubuntu 16.04
system using the installed gcc (5.4.0) and prelink (1.0) and top-of-tree
gdb sources.  When I run the gdb testsuite and compare my results
with ones from the gdb testing mailing list I get several failures
that involve prelink and the -u option.  It looks like the test run
from the mailing list has XFAIL's for tests that use prelink because
it is not installed on the system.  I get more FAIL's when I remove
prelink, not XFAIL's, I am not sure why.  On my system when I use prelink
with the -u option it gives this message:

+ /usr/sbin/prelink -uN --dynamic-linker=/home/sellcey/gdb-std/obj/binutils-gdb/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d/ld-linux-aarch64.so.1 --ld-library-path=/home/sellcey/gdb-std/obj/binutils-gdb/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d /home/sellcey/gdb-std/obj/binutils-gdb/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread /home/sellcey/gdb-std/obj/binutils-gdb/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d/libm.so.6 /home/sellcey/gdb-std/obj/binutils-gdb/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d/libc.so.6 /home/sellcey/gdb-std/obj/binutils-gdb/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d/ld-linux-aarch64.so.1
prelink: "/home/sellcey/gdb-std/obj/binutils-gdb/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread"'s architecture is not supported
prelink: "/home/sellcey/gdb-std/obj/binutils-gdb/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d/libm.so.6"'s architecture is not supported
prelink: "/home/sellcey/gdb-std/obj/binutils-gdb/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d/libc.so.6"'s architecture is not supported
prelink: "/home/sellcey/gdb-std/obj/binutils-gdb/gdb/testsuite/outputs/gdb.base/attach-pie-misread/attach-pie-misread.d/ld-linux-aarch64.so.1"'s architecture is not supported


Steve Ellcey
sellcey@cavium.com

Re: prelink -u on aarch64 question

[Jan Kratochvil]

On Wed, 26 Jul 2017 19:37:46 +0200, Steve Ellcey wrote:
> I was wondering if anyone could tell me anything about prelink on
> aarch64?

prelink probably is not supported on aarch64 at all, I have not checked.

But even on x86* prelink has been discontinued - on its "core" distro:
	Don't enable prelink by default in Fedora
	https://pagure.io/fesco/issue/1183

I think at least the prelink testfile gdb.base/break-interp.exp could be even
disabled by default nowadays (saying that as author of the testfile) as even
when it PASSes it is very slow given the huge number of combinations it does
test.


Jan

Re: prelink -u on aarch64 question

[Steve Ellcey]

On Wed, 2017-07-26 at 21:44 +0200, Jan Kratochvil wrote:
> On Wed, 26 Jul 2017 19:37:46 +0200, Steve Ellcey wrote:
> > 
> > I was wondering if anyone could tell me anything about prelink on
> > aarch64?
> prelink probably is not supported on aarch64 at all, I have not checked.
> 
> But even on x86* prelink has been discontinued - on its "core" distro:
> 	Don't enable prelink by default in Fedora
> 	https://pagure.io/fesco/issue/1183
> 
> I think at least the prelink testfile gdb.base/break-interp.exp could be even
> disabled by default nowadays (saying that as author of the testfile) as even
> when it PASSes it is very slow given the huge number of combinations
> it does
> test.
> 
> 
> Jan

I don't see any indication that gdb.base/break-interp.exp is disabled
by default, though it is part of the slow_tests list so if you don't
run slow tests then it would not show up.  I actually have four tests
that fail due to prelink:

gdb.base/attach-pie-misread.exp
gdb.base/break-interp.exp
gdb.base/prelink.exp
gdb.threads/dlopen-libpthread.exp

It also seems to get used in:

gdb.server/connect-stopped-target.exp
gdb.server/solib-list.exp
gdb.base/nostdlib.exp
gdb.base/relativedebug.exp
gdb.base/solib-overlap.exp

Although those did not show up in my FAIL list.

Should we just remove all the gdb tests that use prelink?

Steve Ellcey
sellcey@cavium.com