lib/52217: Broken binary compatibility in libm

[coypu%sdf.org@localhost]

>Number:         52217
>Category:       lib
>Synopsis:       Broken binary compatibility in libm
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 07 19:25:00 +0000 2017
>Originator:     coypu
>Release:        NetBSD 7.99.70
>Organization:
>Environment:
NetBSD loggy 7.99.70 NetBSD 7.99.70 (GENERIC) #5: Sat Apr 22 11:50:07 IDT 2017  fly@loggy:/home/fly/amd64/sys/arch/amd64/compile/GENERIC amd64

>Description:

>How-To-Repeat:
Obtain libm.so from netbsd-7
Create following test.c:

#include <complex.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
  long long op1 = 1LL;
  printf("%16llx\n", casinl(op1));

  return 0;
}



gcc libm.so test.c
./a.out
./a.out: Undefined PLT symbol "casinl" (symnum = 7)
LD_PRELOAD=libm.so ./a.out
               0
>Fix: