Hello,
I am trying to get prelinking to work on a MIPS target.
I reproduced the issue on OpenWRT (master branch, using uClibc-0.9.33.2)
using the "MIPS Malta CoreLV board (qemu)" Target System.
At first uClibc Standalone Support was disabled leading to this when
trying to run the dynamic linker as an executable:
root@OpenWrt:/# /lib/ld-uClibc.so.0
Standalone execution is not enabled
Then I enabled the following options in uClibc configuration:
LDSO_STANDALONE_SUPPORT=y
LDSO_PRELINK_SUPPORT=y
Afterward I get this when running the dynamic linker as an executable
which means the standalone support has been enabled successfully:
root@OpenWrt:/# /lib/ld-uClibc.so.0
root@OpenWrt:/#
Then here comes the issue:
root@OpenWrt:/# LD_WARN= LD_TRACE_PRELINKING=1 LD_TRACE_LOADED_OBJECTS=1
/lib/ld-uClibc.so.0 /bin/busybox
root@OpenWrt:/#
This should (should it?) print the list of libraries that busybox
depends on (at least eglibc does that on x86), but here it prints nothing.
However, if running directly busybox with those environment variables I
get what I wanted:
root@OpenWrt:/# LD_WARN= LD_TRACE_PRELINKING=1 LD_TRACE_LOADED_OBJECTS=1
/bin/busybox
/bin/busybox => /bin/busybox (0x400000, 0x0)
libcrypt.so.0 => /lib/libcrypt.so.0 (0x77c19000, 0x77c19000)
libm.so.0 => /lib/libm.so.0 (0x77bf4000, 0x77bf4000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x77bd0000, 0x77bd0000)
libc.so.0 => /lib/libc.so.0 (0x77b63000, 0x77b63000) TLS(0x1, 0x0)
ld-uClibc.so.0 => /lib/ld-uClibc.so.0 (0x77c3d000, 0x77c3d000)
Unfortunately, the prelink tool seems to depend on the eglibc behaviour
which is to print those messages even if the dynamic linker is called as
an executable, therefore I get those errors when trying to prelink:
root@OpenWrt:/# cat /etc/prelink.conf
-l /lib
-l /usr/lib
-l /bin
-l /sbin
-l /usr/bin
-l /usr/sbin
root@OpenWrt:/# prelink -c /etc/prelink.conf -C /etc/prelink.cache
--dynamic-linker=/lib/ld-uClibc.so.0 -mvR --ld-library-path=/lib:/usr/lib -a
prelink: /bin/ubus seen 0 times in LD_TRACE_PRELINKING output, expected once
prelink: /bin/busybox seen 0 times in LD_TRACE_PRELINKING output,
expected once
[...] etc
By looking at prelink source code (src/gather.c) I can see that indeed
prelink tries to execute "LD_WARN= LD_TRACE_PRELINKING=1
LD_TRACE_LOADED_OBJECTS=1 /lib/ld-uClibc.so.0 /bin/busybox" and then
tries to parse the output to get the dependencies:
argv[i++] = ent_filename;
argv[i] = NULL;
envp[0] = "LD_TRACE_LOADED_OBJECTS=1";
envp[1] = "LD_TRACE_PRELINKING=1";
envp[2] = "LD_WARN=";
envp[3] = NULL;
f = execve_open (dl, (char * const *)argv, (char * const *)envp);
Does anyone encounter this issue as well? Is there a known fix?
Thanks :)
PS: I am using prelink-20130503
Regards,
--
Yann Sionneau
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