package/libfastjson: fix build without threads

libfastjson is supposed to use the __sync_*4 atomic intrinsics, but alas
it is not using them because their ./configure decides they are not
available: it uses AC_TRY_RUN to check for them, and the default is to
decide they are not available, because of cross-compilation.

Besides, one of the source files was not including the generated
config.h, so even after fixing ./configure there was still a build
error.

The first patch is a backport from upstream to fix the missing
inclusion.

The second patch is switching AC_TRY_RUN over to AC_LINK_IFELSE, as the
only thing we're interested in is to check for the presence of the
atomic intrisics, and linking is enough for that.

Fixes:
    http://autobuild.buildroot.org/results/192/1923d0b570adba494f83747a9610ea6ec35f5223/
    http://autobuild.buildroot.org/results/23a/23ac0e742ed3a70ae4d038f8c9eadc23e708f671/
    and many others...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/package/libfastjson/0001-fix-missing-config.h.patch b/package/libfastjson/0001-fix-missing-config.h.patch
new file mode 100644
index 0000000000..8663e23d66
--- /dev/null
+++ b/package/libfastjson/0001-fix-missing-config.h.patch
@@ -0,0 +1,29 @@
+From 3e017fe8da1e821d4fcd801c75467c8ec2a81eb4 Mon Sep 17 00:00:00 2001
+From: Rainer Gerhards <rgerhards@adiscon.com>
+Date: Tue, 19 Apr 2016 08:21:50 +0200
+Subject: [PATCH] fix missing config.h
+
+[yann.morin.1998@free.fr: backport from upstream]
+Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
+
+---
+ json_object_iterator.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/json_object_iterator.c b/json_object_iterator.c
+index 6ab3a85..fb51f6e 100644
+--- a/json_object_iterator.c
++++ b/json_object_iterator.c
+@@ -17,8 +17,8 @@
+ *******************************************************************************
+ */
+ 
++#include "config.h"
+ #include <stddef.h>
+-
+ #include "json.h"
+ #include "json_object_private.h"
+ #include "json_object_iterator.h"
+-- 
+2.7.4
+