protobuf-c: fix race condition

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Sinan Kaya <okaya@kernel.org>
(cherry picked from commit 489d3b4b932ee8016d792341f8ea5836a9522cd4)
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-devtools/protobuf/protobuf-c/0001-avoid-race-condition.patch

@@ -0,0 +1,36 @@
+From 216e31260b618ec73862f9f5336597f391444dac Mon Sep 17 00:00:00 2001
+From: Chen Qi <Qi.Chen@windriver.com>
+Date: Sun, 29 Sep 2019 17:20:42 +0800
+Subject: [PATCH] avoid race condition
+
+It's possible that the cxx-generate-packed-data.cc is compiled
+while the t/test-full.pb.h is being generated. This will result
+the following error.
+
+  DEBUG:	./t/test-full.pb.h:4:0: error: unterminated #ifndef
+  ./t/test-full.pb.h:4:0: error: unterminated #ifndef
+
+Add a dependency to avoid such problem.
+
+Upstream-Status: Pending
+
+Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
+---
+ Makefile.am | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/Makefile.am b/Makefile.am
+index b0cb065..1608ae0 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -156,6 +156,7 @@ noinst_PROGRAMS += \
+ t_generated_code2_cxx_generate_packed_data_SOURCES = \
+ 	t/generated-code2/cxx-generate-packed-data.cc \
+ 	t/test-full.pb.cc
++t/generated-code2/cxx-generate-packed-data.cc: t/test-full.pb.h
+ $(t_generated_code2_cxx_generate_packed_data_OBJECTS): t/test-full.pb.h
+ t_generated_code2_cxx_generate_packed_data_CXXFLAGS = \
+ 	$(AM_CXXFLAGS) \
+-- 
+2.17.1
+

meta-oe/recipes-devtools/protobuf/protobuf-c_1.3.1.bb

@@ -15,7 +15,8 @@ DEPENDS = "protobuf-native protobuf"
 PV .= "+git${SRCPV}"
 SRCREV = "269771b4b45d3aba04e59569f53600003db8d9ff"
 
-SRC_URI = "git://github.com/protobuf-c/protobuf-c.git"
+SRC_URI = "git://github.com/protobuf-c/protobuf-c.git \
+           file://0001-avoid-race-condition.patch"
 
 S = "${WORKDIR}/git"