Upgrade protobuf to 3.1 in Travis-CI linux

.travis.yml

@@ -29,10 +29,6 @@ addons:
       - python-pip
       - python2.7-dev
       - m4
-      - libprotobuf-dev
-      - doxygen
-      - protobuf-compiler
-      - python-protobuf
       - python-numpy
       - python-wheel
       - libgoogle-glog-dev
@@ -43,6 +39,8 @@ addons:
       - graphviz
       - swig
       - clang-format-3.8
+      - automake
+      - libtool
 before_install:
   - |
     if [ ${JOB} == "BUILD_AND_TEST" ]; then

cmake/check_packages.cmake

@@ -28,7 +28,6 @@ endif()
 
 if(WITH_DOC)
   find_package(Sphinx REQUIRED)
-  find_package(Doxygen REQUIRED)
   find_python_module(recommonmark REQUIRED)
 endif()
 

paddle/scripts/travis/before_install.linux.sh

@@ -1,5 +1,16 @@
 #!/bin/bash
 set -e
+
+cd /tmp
+wget https://github.com/google/protobuf/archive/v3.0.2.tar.gz -O protobuf.tar.gz
+tar xf protobuf.tar.gz
+cd protobuf*
+./autogen.sh
+./configure
+make -j 2 install
+cd ..
+rm -rf protobuf*
+
 pushd /usr/src/gtest
 cmake .
 make

paddle/scripts/travis/main.sh

@@ -1,6 +1,11 @@
 #!/bin/bash
 cd `dirname $0`
 
+if [ "$TRAVIS_OS_NAME" == "linux" ]; then
+  # for manually installed protobuf 3.10
+  export LD_LIBRARY_PATH=/usr/local/lib/:$LD_LIBRARY_PATH
+fi
+
 if [ ${JOB} == "BUILD_AND_TEST" ]; then
   ./build_and_test.sh
 elif [ ${JOB} == "DOCS" ]; then