[Bug target/66780] New: [4.9 Regression] Compiling with -fstack-protector-strong causes binary to segfault

["glaubitz at physik dot fu-berlin.de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66780

            Bug ID: 66780
           Summary: [4.9 Regression] Compiling with
                    -fstack-protector-strong causes binary to segfault
           Product: gcc
           Version: 4.9.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: glaubitz at physik dot fu-berlin.de
                CC: kkojima at gcc dot gnu.org, olegendo at gcc dot gnu.org
  Target Milestone: ---
            Target: sh*-*-*

Hello!

After several days of debugging, I finally found out why many packages build on
the Debian sh4 buildds currently segfault on sh4, it's the CFLAG
-fstack-protector-strong which is the culprit.

To reproduce:

$ wget
http://http.debian.net/debian/pool/main/p/procps/procps_3.3.10.orig.tar.xz
$ tar xf procps_3.3.10.orig.tar.xz
$ cd procps-3.3.10
$ export CFLAGS="-g -fstack-protector-strong -Wformat -Werror=format-security"
; export "CXXFLAGS=-g -fstack-protector-strong -Wformat
-Werror=format-security" ; ./configure ; make
$ ./ps/pscommand 
Signal 11 (SEGV) caught by lt-pscommand (procps-ng version 3.3.10).
/root/procps/procps-3.3.10/ps/.libs/lt-pscommand:display.c:66: please report
this bug
Segmentation fault
$ make clean
$ export CFLAGS="-g -Wformat -Werror=format-security" ; export "CXXFLAGS=-g
-Wformat -Werror=format-security" ; ./configure ; make
$ ./ps/pscommand 
  PID TTY          TIME CMD
 5396 pts/0    00:00:00 lt-pscommand
32356 pts/0    00:00:00 bash
$

This bug affects many packages in the Debian sh4 port, for example:

pcre3:
http://buildd.debian-ports.org/status/fetch.php?pkg=pcre3&arch=sh4&ver=2%3A8.35-7&stamp=1436092677
cups:
http://buildd.debian-ports.org/status/fetch.php?pkg=cups&arch=sh4&ver=1.7.5-12&stamp=1436128958
glib-2.0:
http://buildd.debian-ports.org/status/fetch.php?pkg=glib2.0&arch=sh4&ver=2.44.1-1.1&stamp=1436141984

Adrian