python3-protobuf: add cpp implementation support

- Compiling with option `--cpp_implementation', add cpp implementation
support which requires to build with protobuf.

- Workaround native compile failure while host gcc <= 4.8
Setting environment KOKORO_BUILD_NUMBER, the build will explicitly compile
with option `-std=c++11', it could  workaround native compile failure while
host gcc <= 4.8
...
/usr/include/c++/4.8/bits/c++0x_warning.h:32:2: error: #error This file
requires compiler and library support for the ISO C++ 2011 standard. This
support is currently experimental, and must be enabled with the -std=c++11
or -std=gnu++11 compiler options
...

- Add Python 3.7 compatibility

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/meta-python/recipes-devtools/python/python3-protobuf_3.6.1.bb b/meta-python/recipes-devtools/python/python3-protobuf_3.6.1.bb
index 781d1dc4da..9b0668a02b 100644
--- a/meta-python/recipes-devtools/python/python3-protobuf_3.6.1.bb
+++ b/meta-python/recipes-devtools/python/python3-protobuf_3.6.1.bb
@@ -1,2 +1,11 @@
 inherit setuptools3
 require python-protobuf.inc
+
+SRC_URI += "file://0001-Add-Python-3.7-compatibility-4862.patch"
+DEPENDS += "protobuf"
+DISTUTILS_BUILD_ARGS += "--cpp_implementation"
+DISTUTILS_INSTALL_ARGS += "--cpp_implementation"
+
+do_compile_prepend_class-native () {
+    export KOKORO_BUILD_NUMBER="1"
+}