------- Comment From mauri...@br.ibm.com 2015-09-02 22:11 EDT-------
Today's work on this..
This is not so simple to "fix".
libchecktur.so really requires a dynamic libgcc because it uses pthreads
(namely pthread_cancel).
it can go without a link-time dependency on libgcc *if* it's not built with
-fexceptions.
it will run, but crash when pthread_cancel() is called.
I think this is already happening w/ other pieces of the code (libmultipath,
iirc) - it's just luck it didn't crash yet.
Some testing/experiments.
$ cat test.c
#include <pthread.h>
#include <stdlib.h>
void * loop(void *arg) {
}
int main() {
pthread_t thread;
pthread_create(&thread, NULL, &loop, NULL);
pthread_cancel(thread); // this requires libgcc_s.so
return 0;
}
$ gcc -pthread -o test test.c
$ ./test; echo $?
0
$ ldd test
linux-vdso64.so.1 => (0x00003fff81730000)
libpthread.so.0 => /lib/powerpc64le-linux-gnu/libpthread.so.0
(0x00003fff816e0000)
libc.so.6 => /lib/powerpc64le-linux-gnu/libc.so.6 (0x00003fff81500000)
/lib64/ld64.so.2 (0x0000000050130000)
^ notice there's no dependency on libgcc_s at link-time, it's a run-time
dlopen() in pthread_cancel_init()
$ find /lib -name libgcc_s.so.1
/lib/powerpc64le-linux-gnu/libgcc_s.so.1
On installer:
~ # ./test
libgcc_s.so.1 must be installed for pthread_cancel to work
Aborted
~ # find /lib -name libgcc_s.so.1
~ #
To be continued.
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https://bugs.launchpad.net/bugs/1489379
Title:
LTE: ISST:leeklp4 no mpath choices for install ubuntu 15.10
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