Median fails robustness test on median

[robe]

After this r16579

I'm seeing on winnie's 32-bit 9.6 run so could be a 32-bit only issue. I'll try to rerun to see if the 64-bits exhibit similar issue

 Test: test_median_handles_3d_correctly ...passed
  Test: test_median_robustness ...make[2]: *** [Makefile:86: check] Segmentation fault
make[2]: Leaving directory '/projects/postgis/branches/2.4/liblwgeom/cunit'
make[1]: *** [Makefile:207: check] Error 2
make[1]: Leaving directory '/projects/postgis/branches/2.4/liblwgeom'
make: *** [GNUmakefile:16: check] Error 1

[robe]

Same issue with 2.3 branch - r16580

[Algunenano]

I've been able to reproduce it in Ubuntu 17.04 (32bits):

Program received signal SIGSEGV, Segmentation fault.
0xb7f5ba74 in lwpoint_is_empty (point=0x0) at lwpoint.c:293
293		if ( ! point->point || point->point->npoints < 1 )
(gdb) bt
#0  0xb7f5ba74 in lwpoint_is_empty (point=0x0) at lwpoint.c:293
#1  0xb7f5bb0a in lwpoint_getPoint3dz_p (point=0x0, out=0xbfffeeb8) at lwpoint.c:49
#2  0x0804d320 in do_median_test (input=<optimized out>, expected=<optimized out>) at cu_algorithm.c:1015
#3  0xb7ee1507 in ?? () from /usr/lib/i386-linux-gnu/libcunit.so.1
#4  0xb7ee1f76 in CU_run_test () from /usr/lib/i386-linux-gnu/libcunit.so.1
#5  0x0804cd55 in main (argc=<optimized out>, argv=<optimized out>) at cu_tester.c:216

I'll have a look tomorrow.

[Raul Marin]

In 16587:

Avoid segfault in median test (32bits)

References #4095

[Raul Marin]

Should be ok now.