icecc preprocesses source files locally before shipping them off to be compiled
on remote hosts. This preprocessing removes comments, including /* fallthrough */
comments in switch statements that normally prevent the implicit-fallthrough
warning. Rather than turning off -Werror completely, just reduce
implicit-fallthrough to a warning only.

In the -native case, we might be building on an earlier gcc, eg. gcc 5.4
under Ubuntu 16.04, so we do disable -Werror completely.

See https://github.com/icecc/icecream/issues/419

Signed-off-by: Douglas Royds <douglas.royds@taitradio.com>
---
 meta/recipes-devtools/json-c/json-c_0.13.1.bb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/meta/recipes-devtools/json-c/json-c_0.13.1.bb b/meta/recipes-devtools/json-c/json-c_0.13.1.bb
index 5b10e68297..87a87aec44 100644
--- a/meta/recipes-devtools/json-c/json-c_0.13.1.bb
+++ b/meta/recipes-devtools/json-c/json-c_0.13.1.bb
@@ -22,6 +22,9 @@ inherit autotools
 
 EXTRA_OECONF = "--enable-rdrand"
 
+TARGET_CPPFLAGS =+ "-Wno-error=implicit-fallthrough"
+BUILD_CPPFLAGS =+ "-Wno-error"
+
 do_configure_prepend() {
     # Clean up autoconf cruft that should not be in the tarball
     rm -f ${S}/config.status
