PSPP-BUG: [bug #52072] Strange regression with recent GCC (or Glibc)

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?52072>

                 Summary: Strange regression with recent GCC (or Glibc)
                 Project: PSPP
            Submitted by: None
            Submitted on: Wed 20 Sep 2017 02:23:12 PM UTC
                Category: None
                Severity: 5 - Average
                  Status: None
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None
                  Effort: 0.00

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Details:

Hello All!
Recently PSPP ver. 1.0.1 started to fail passing the tests. The only one
failed test is no. 343 (sort-variables.at). Turned out that the following
script has different output on PPC64 / PPC64LE arches:

DATA LIST FREE/a b c.
VARIABLE LABEL a "hi there".
SORT VARIABLES  LABEL.
DISPLAY NAMES.
SORT VARIABLES  LABEL  (D).
DISPLAY NAMES.


On x86_64 machine (
https://koji.fedoraproject.org/koji/getfile?taskID=21983571&volume=DEFAULT&name=build.log&offset=-4000
):

+ ./src/ui/terminal/pspp -O format=csv sort-variables.sps
Variable
b
c
a
Variable
a
c
b


On PPC64 (
https://koji.fedoraproject.org/koji/getfile?taskID=21983574&volume=DEFAULT&name=build.log&offset=-4000
) or on PPC64LE (
https://koji.fedoraproject.org/koji/getfile?taskID=21983572&volume=DEFAULT&name=build.log&offset=-4000
):

+ ./src/ui/terminal/pspp -O format=csv sort-variables.sps
Variable
c
b
a
Variable
a
b
c

I'm not very well familiar with PSPP internals to pinpoint exact location
where it fails, so I've got stuck. Could someone pinpoint a search area for me
where should I look for the regression? 

I can't reproduce it on the PPC64 machine (I have access to) with the
following versions:

glibc-2.24-9.fc25.ppc64
gcc-6.4.1-1.fc25.ppc64

I can 100% reproduce it with the following packages:

glibc-2.26.90-15.fc28
gcc-7.2.1-1.fc28




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