Update instructions about getting protobuf source.

cmake/README.md

@@ -41,9 +41,16 @@ Good. Now you are ready to continue.
 Getting Sources
 ===============
 
-You can get the latest stable source packages from the
-[releases](https://github.com/google/protobuf/releases) page.
-Or you can type:
+You can get the latest stable source packages from the release page:
+
+    https://github.com/google/protobuf/releases/latest
+
+For example: if you only need C++, download `protobuf-cpp-[VERSION].tar.gz`; if
+you need C++ and Java, download `protobuf-java-[VERSION].tar.gz` (every package
+contains C++ source already); if you need C++ and multiple other languages,
+download `protobuf-all-[VERSION].tar.gz`.
+
+Or you can use git to clone from protobuf git repository.
 
      C:\Path\to> git clone -b [release_tag] https://github.com/google/protobuf.git
 
@@ -55,7 +62,8 @@ Go to the project folder:
      C:\Path\to>cd protobuf
      C:\Path\to\protobuf>
 
-Remember to update any submodules:
+Remember to update any submodules if you are using git clone (you can skip this
+step if you are using a release .tar.gz or .zip package):
 
 ```console
 C:\Path\to> git submodule update --init --recursive
@@ -63,7 +71,7 @@ C:\Path\to> git submodule update --init --recursive
 
 Now go to *cmake* folder in protobuf sources:
 
-     C:\Path\to\protobuf\gmock>cd ..\cmake
+     C:\Path\to\protobuf>cd cmake
      C:\Path\to\protobuf\cmake>
 
 Good. Now you are ready to *CMake* configuration.
@@ -113,7 +121,7 @@ It will generate *nmake* *Makefile* in current directory.
 To create *Visual Studio* solution file:
 
      C:\Path\to\protobuf\cmake\build>mkdir solution & cd solution
-     C:\Path\to\protobuf\cmake\build\solution>cmake -G "Visual Studio 12 2013 Win64" ^
+     C:\Path\to\protobuf\cmake\build\solution>cmake -G "Visual Studio 14 2015 Win64" ^
      -DCMAKE_INSTALL_PREFIX=../../../../install ^
      ../..
 

src/README.md

@@ -19,25 +19,31 @@ To build protobuf from source, the following tools are needed:
   * g++
   * unzip
 
-On Ubuntu, you can install them with:
+On Ubuntu/Debian, you can install them with:
 
     $ sudo apt-get install autoconf automake libtool curl make g++ unzip
 
 On other platforms, please use the corresponding package managing tool to
 install them before proceeding.
 
-If you get the source from github, you need to generate the configure script
-first:
+To get the source, download one of the release .tar.gz or .zip packages in the
+release page:
 
-    $ git submodule update --init --recursive
-    $ ./autogen.sh
+    https://github.com/google/protobuf/releases/latest
+
+For example: if you only need C++, download `protobuf-cpp-[VERSION].tar.gz`; if
+you need C++ and Java, download `protobuf-java-[VERSION].tar.gz` (every package
+contains C++ source already); if you need C++ and multiple other languages,
+download `protobuf-all-[VERSION].tar.gz`.
 
-This will download gmock source (which is used for C++ Protocol Buffer
-unit-tests) to the current directory and run automake, autoconf, etc.
-to generate the configure script and various template makefiles.
+You can also get the source by "git clone" our git repository. Make sure you
+have also cloned the submodules and generated the configure script (skip this
+if you are using a release .tar.gz or .zip package):
 
-You can skip this step if you are using a release package (which already
-contains gmock and the configure script).
+    $ git clone https://github.com/google/protobuf.git
+    $ cd protobuf
+    $ git submodule update --init --recursive
+    $ ./autogen.sh
 
 To build and install the C++ Protocol Buffer runtime and the Protocol
 Buffer compiler (protoc) execute the following:
@@ -178,7 +184,7 @@ C++ Installation - Windows
 If you only need the protoc binary, you can download it from the release
 page:
 
-  https://github.com/google/protobuf/releases
+    https://github.com/google/protobuf/releases/latest
 
 In the downloads section, download the zip file protoc-$VERSION-win32.zip.
 It contains the protoc binary as well as public proto files of protobuf