Proposing this patch to just disable the warning. Not super familiar with the general policies around this, though.
---
debian/changelog | 7 +++++++
debian/rules | 6 ++++++
2 files changed, 13 insertions(+)
diff --git a/debian/changelog b/debian/changelog
index 9cb8901..535de0c 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,10 @@
+faketime (0.9.6-4.1) UNRELEASED; urgency=medium
+
+ * Non-maintainer upload.
+ * Disable the nonnull-compare flag for faketime.
+
+ -- Mike Gerow <ge...@mgerow.com> Thu, 07 Jul 2016 11:36:54 +0200
+
faketime (0.9.6-4) unstable; urgency=medium
* link to libfaketime's README from faketime's doc dir (thanks, Ximin
diff --git a/debian/rules b/debian/rules
index cf3813a..1cd0399 100755
--- a/debian/rules
+++ b/debian/rules
@@ -5,6 +5,12 @@
export DEB_CFLAGS_MAINT_APPEND=-DMULTI_ARCH
+# GCC 6 includes a warning for checking if a variable nonnull if it's been
+# tagged that passing a NULL value creates undefined behavior. Ignore this for
+# faketime since the compilation units that define this for it are in libc,
+# which may or may not have these flags.
+export CFLAGS+=-Wno-nonnull-compare
+
# make sure dh_makeshlibs does not modify post{inst,rm} scripts:
# (avoids lintian's postinst-has-useless-call-to-ldconfig)
override_dh_makeshlibs:
--
2.8.1
--
Mike Gerow
ge...@mgerow.com
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