Ubuntu
collectd package

Would look like:
src/madwifi.c:522:62: error: ‘%s’ directive output may be truncated writing up to 127 bytes into a region of size 114 [-Werror=format-truncation=]
  522 | snprintf(vl.type_instance, sizeof(vl.type_instance), "%s-%s", ti1, ti2);
      | ^~
......
  684 | submit_derive(dev, "node_stat", "ns_rx_beacons", mac,
      | ~~~
In file included from /usr/include/stdio.h:867,
                 from ./src/daemon/collectd.h:49,
                 from src/madwifi.c:89:
/usr/include/powerpc64le-linux-gnu/bits/stdio2.h:67:10: note: ‘__builtin___snprintf_chk’ output between 15 and 142 bytes into a destination of size 128
   67 | return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   68 | __bos (__s), __fmt, __va_arg_pack ());
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/madwifi.c:522:64: error: ‘__builtin___snprintf_chk’ output may be truncated before the last format character [-Werror=format-truncation=]
  522 | snprintf(vl.type_instance, sizeof(vl.type_instance), "%s-%s", ti1, ti2);
      | ^
In file included from /usr/include/stdio.h:867,
                 from ./src/daemon/collectd.h:49,
                 from src/madwifi.c:89:
/usr/include/powerpc64le-linux-gnu/bits/stdio2.h:67:10: note: ‘__builtin___snprintf_chk’ output 2 or more bytes (assuming 129) into a destination of size 128
   67 | return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   68 | __bos (__s), __fmt, __va_arg_pack ());
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/madwifi.c:522:62: error: ‘%s’ directive output may be truncated writing up to 127 bytes into a region of size 120 [-Werror=format-truncation=]
  522 | snprintf(vl.type_instance, sizeof(vl.type_instance), "%s-%s", ti1, ti2);
      | ^~
In file included from /usr/include/stdio.h:867,
                 from ./src/daemon/collectd.h:49,
                 from src/madwifi.c:89:
/usr/include/powerpc64le-linux-gnu/bits/stdio2.h:67:10: note: ‘__builtin___snprintf_chk’ output between 9 and 136 bytes into a destination of size 128
   67 | return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   68 | __bos (__s), __fmt, __va_arg_pack ());
      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Signed-off-by: Christian Ehrhardt <email address hidden>

6f904cc... by Christian Ehrhardt  on 2019-12-11

- debian/rules: Work around FTBFS with glibc 2.30 with -Wno-cpp

In file included from src/contextswitch.c:30:
/usr/include/x86_64-linux-gnu/sys/sysctl.h:21:2: error: #warning
  "The <sys/sysctl.h> header is deprecated and will be removed."
  [-Werror=cpp] 21 | #warning "The <sys/sysctl.h> header is deprecated and will be removed."
  | ^~~~~~~ cc1: all warnings being treated as errors

Lets ignore the error for now until upstream has fixed it.

The overrride was only tried with gcc9, so lets add it inside the gcc9 section that already exists in d/rules.

Signed-off-by: Christian Ehrhardt <email address hidden>

7898cee... by Bernd Zeimetz on 2019-11-14

Import patches-unapplied version 5.9.2.g-1 to debian/sid