[Buildroot] [git commit branch/2017.02.x] jq: compile as _GNU_SOURCE to fix segfault when compiled with gcc 6

[Buildroot] [git commit branch/2017.02.x] jq: compile as _GNU_SOURCE to fix segfault when compiled with gcc 6

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=22905de36242920622d271f03b56f614fea15832
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2017.02.x

When compiling host-jq with gcc 6+, running it gives an immediate segfault.
Reported upstream: https://github.com/stedolan/jq/issues/1598

The issue can be solved by compiling with _GNU_SOURCE as extra preprocessor
define. Once the issue is solved upstream, this change can be reverted.

As the issue will normally be the same for target, apply the same fix there.

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 21114013e83a67fd6b84e1d911ee503be3f0e35d)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/jq/jq.mk | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/package/jq/jq.mk b/package/jq/jq.mk
index 9a094ba9a0..659b8dc846 100644
--- a/package/jq/jq.mk
+++ b/package/jq/jq.mk
@@ -10,8 +10,10 @@ JQ_LICENSE = MIT (code), CC-BY-3.0 (documentation)
 JQ_LICENSE_FILES = COPYING
 
 # uses c99 specific features
-JQ_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -std=c99"
-HOST_JQ_CONF_ENV += CFLAGS="$(HOST_CFLAGS) -std=c99"
+# _GNU_SOURCE added to fix gcc6+ host compilation
+# (https://github.com/stedolan/jq/issues/1598)
+JQ_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -std=c99 -D_GNU_SOURCE"
+HOST_JQ_CONF_ENV += CFLAGS="$(HOST_CFLAGS) -std=c99 -D_GNU_SOURCE"
 
 # jq explicitly enables maintainer mode, which we don't need/want
 JQ_CONF_OPTS += --disable-maintainer-mode