From 4333edb34048d29a410cc247ff7ffbad8145132f Mon Sep 17 00:00:00 2001 From: Feng Xiao Date: Sun, 31 May 2015 02:28:34 -0700 Subject: Add cmake support. --- cmake/README.md | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 118 insertions(+) create mode 100644 cmake/README.md (limited to 'cmake/README.md') diff --git a/cmake/README.md b/cmake/README.md new file mode 100644 index 00000000..2f1fef3f --- /dev/null +++ b/cmake/README.md @@ -0,0 +1,118 @@ +This directory contains cmake files that can be used to generate MSVC project +files in order to build protobuf on windows. You need to have cmake installed +on your computer before proceeding. + +Compiling and Installing +======================== + +0) Check whether a gtest directory exists in the upper level directory. If + you checkout the code from github via "git clone", this gtest directory + won't exist and you won't be able to build the tests described below. To + avoid this problem consider downloading one of the release tar balls which + contains gtest already and copying the gest directory from there to your + protobuf directory: + https://github.com/google/protobuf/releases +1) Use cmake to generate MSVC project files. Running the following commands + in a command shell will generate project files for Visual Studio 2008 in + a sub-directory named "build". + > cd path/to/protobuf/cmake + > mkdir build + > cd build + > cmake -G "Visual Studio 9 2008" .. +2) Open the generated protobuf.sln file in Microsoft Visual Studio. +3) Choose "Debug" or "Release" configuration as desired. +4) From the Build menu, choose "Build Solution". Wait for compiling to finish. +5) From a command shell, run tests.exe and lite-test.exe and check that all + tests pass. Make sure you have changed the working directory to the output + directory because tests.exe will try to find and run test_plugin.exe + in the working directory. +5) Run extract_includes.bat to copy all the public headers into a separate + "include" directory (under the top-level package directory). +6) Copy the contents of the include directory to wherever you want to put + headers. +7) Copy protoc.exe wherever you put build tools (probably somewhere in your + PATH). +8) Copy libprotobuf.lib, libprotobuf-lite.lib, and libprotoc.lib wherever you + put libraries. + +* To avoid conflicts between the MSVC debug and release runtime libraries, when + compiling a debug build of your application, you may need to link against a + debug build of libprotobuf.lib. Similarly, release builds should link against + release libs. + +DLLs vs. static linking +======================= + +Static linking is now the default for the Protocol Buffer libraries. Due to +issues with Win32's use of a separate heap for each DLL, as well as binary +compatibility issues between different versions of MSVC's STL library, it is +recommended that you use static linkage only. However, it is possible to +build libprotobuf and libprotoc as DLLs if you really want. To do this, +do the following: + + 1) Add an additional flag "-DBUILD_SHARED_LIBS=ON" when invoking cmake: + > cmake -G "Visual Studio 9 2008" -DBUILD_SHARED_LIBS=ON .. + 2) Follow the same steps as described in the above section. + 3) When compiling your project, make sure to #define PROTOBUF_USE_DLLS. + +When distributing your software to end users, we strongly recommend that you +do NOT install libprotobuf.dll or libprotoc.dll to any shared location. +Instead, keep these libraries next to your binaries, in your application's +own install directory. C++ makes it very difficult to maintain binary +compatibility between releases, so it is likely that future versions of these +libraries will *not* be usable as drop-in replacements. + +If your project is itself a DLL intended for use by third-party software, we +recommend that you do NOT expose protocol buffer objects in your library's +public interface, and that you statically link protocol buffers into your +library. + +ZLib support +============ + +If you want to include GzipInputStream and GzipOutputStream +(google/protobuf/io/gzip_stream.h) in libprotobuf, you will need to do a few +additional steps: + +1) Obtain a copy of the zlib library. The pre-compiled DLL at zlib.net works. +2) Make sure zlib's two headers are in your include path and that the .lib file + is in your library path. You could place all three files directly into this + cmake directory to compile libprotobuf, but they need to be visible to + your own project as well, so you should probably just put them into the + VC shared icnlude and library directories. +3) Add flag "-DZLIB=ON" when invoking cmake: + > cmake -G "Visual Studio 9 2008" -DZLIB=ON .. + If it reports NOTFOUND for zlib_include or zlib_lib, you might haven't put + the headers or the .lib file in the right directory. +4) Open the generated protobuf.sln file and build as usual. + +Notes on Compiler Warnings +========================== + +The following warnings have been disabled while building the protobuf libraries +and compiler. You may have to disable some of them in your own project as +well, or live with them. + +C4018 - 'expression' : signed/unsigned mismatch +C4146 - unary minus operator applied to unsigned type, result still unsigned +C4244 - Conversion from 'type1' to 'type2', possible loss of data. +C4251 - 'identifier' : class 'type' needs to have dll-interface to be used by + clients of class 'type2' +C4267 - Conversion from 'size_t' to 'type', possible loss of data. +C4305 - 'identifier' : truncation from 'type1' to 'type2' +C4355 - 'this' : used in base member initializer list +C4800 - 'type' : forcing value to bool 'true' or 'false' (performance warning) +C4996 - 'function': was declared deprecated + +C4251 is of particular note, if you are compiling the Protocol Buffer library +as a DLL (see previous section). The protocol buffer library uses templates in +its public interfaces. MSVC does not provide any reasonable way to export +template classes from a DLL. However, in practice, it appears that exporting +templates is not necessary anyway. Since the complete definition of any +template is available in the header files, anyone importing the DLL will just +end up compiling instances of the templates into their own binary. The +Protocol Buffer implementation does not rely on static template members being +unique, so there should be no problem with this, but MSVC prints warning +nevertheless. So, we disable it. Unfortunately, this warning will also be +produced when compiling code which merely uses protocol buffers, meaning you +may have to disable it in your code too. -- cgit v1.2.3 From 2286ab328c0ca04630193b1d3c1aa8eb5fb7aea3 Mon Sep 17 00:00:00 2001 From: Feng Xiao Date: Thu, 4 Jun 2015 11:12:32 -0700 Subject: Fix README.md formatting. Change-Id: I121cb70bfdc4894c297ab1a36f1db47736c0652b --- cmake/README.md | 77 ++++++++++++++++++++++++++++++++------------------------- 1 file changed, 43 insertions(+), 34 deletions(-) (limited to 'cmake/README.md') diff --git a/cmake/README.md b/cmake/README.md index 2f1fef3f..02798b63 100644 --- a/cmake/README.md +++ b/cmake/README.md @@ -5,37 +5,41 @@ on your computer before proceeding. Compiling and Installing ======================== -0) Check whether a gtest directory exists in the upper level directory. If +1. Check whether a gtest directory exists in the upper level directory. If you checkout the code from github via "git clone", this gtest directory won't exist and you won't be able to build the tests described below. To avoid this problem consider downloading one of the release tar balls which contains gtest already and copying the gest directory from there to your protobuf directory: - https://github.com/google/protobuf/releases -1) Use cmake to generate MSVC project files. Running the following commands + + https://github.com/google/protobuf/releases + +2. Use cmake to generate MSVC project files. Running the following commands in a command shell will generate project files for Visual Studio 2008 in a sub-directory named "build". - > cd path/to/protobuf/cmake - > mkdir build - > cd build - > cmake -G "Visual Studio 9 2008" .. -2) Open the generated protobuf.sln file in Microsoft Visual Studio. -3) Choose "Debug" or "Release" configuration as desired. -4) From the Build menu, choose "Build Solution". Wait for compiling to finish. -5) From a command shell, run tests.exe and lite-test.exe and check that all + + $ cd path/to/protobuf/cmake + $ mkdir build + $ cd build + $ cmake -G "Visual Studio 9 2008" .. + +3. Open the generated protobuf.sln file in Microsoft Visual Studio. +4. Choose "Debug" or "Release" configuration as desired. +5. From the Build menu, choose "Build Solution". Wait for compiling to finish. +6. From a command shell, run tests.exe and lite-test.exe and check that all tests pass. Make sure you have changed the working directory to the output directory because tests.exe will try to find and run test_plugin.exe in the working directory. -5) Run extract_includes.bat to copy all the public headers into a separate +7. Run extract_includes.bat to copy all the public headers into a separate "include" directory (under the top-level package directory). -6) Copy the contents of the include directory to wherever you want to put +8. Copy the contents of the include directory to wherever you want to put headers. -7) Copy protoc.exe wherever you put build tools (probably somewhere in your +9. Copy protoc.exe wherever you put build tools (probably somewhere in your PATH). -8) Copy libprotobuf.lib, libprotobuf-lite.lib, and libprotoc.lib wherever you +10. Copy libprotobuf.lib, libprotobuf-lite.lib, and libprotoc.lib wherever you put libraries. -* To avoid conflicts between the MSVC debug and release runtime libraries, when + To avoid conflicts between the MSVC debug and release runtime libraries, when compiling a debug build of your application, you may need to link against a debug build of libprotobuf.lib. Similarly, release builds should link against release libs. @@ -50,10 +54,12 @@ recommended that you use static linkage only. However, it is possible to build libprotobuf and libprotoc as DLLs if you really want. To do this, do the following: - 1) Add an additional flag "-DBUILD_SHARED_LIBS=ON" when invoking cmake: - > cmake -G "Visual Studio 9 2008" -DBUILD_SHARED_LIBS=ON .. - 2) Follow the same steps as described in the above section. - 3) When compiling your project, make sure to #define PROTOBUF_USE_DLLS. + 1. Add an additional flag "-DBUILD_SHARED_LIBS=ON" when invoking cmake: + + $ cmake -G "Visual Studio 9 2008" -DBUILD_SHARED_LIBS=ON .. + + 2. Follow the same steps as described in the above section. + 3. When compiling your project, make sure to #define PROTOBUF_USE_DLLS. When distributing your software to end users, we strongly recommend that you do NOT install libprotobuf.dll or libprotoc.dll to any shared location. @@ -74,14 +80,16 @@ If you want to include GzipInputStream and GzipOutputStream (google/protobuf/io/gzip_stream.h) in libprotobuf, you will need to do a few additional steps: -1) Obtain a copy of the zlib library. The pre-compiled DLL at zlib.net works. -2) Make sure zlib's two headers are in your include path and that the .lib file +1. Obtain a copy of the zlib library. The pre-compiled DLL at zlib.net works. +2. Make sure zlib's two headers are in your include path and that the .lib file is in your library path. You could place all three files directly into this cmake directory to compile libprotobuf, but they need to be visible to your own project as well, so you should probably just put them into the VC shared icnlude and library directories. -3) Add flag "-DZLIB=ON" when invoking cmake: - > cmake -G "Visual Studio 9 2008" -DZLIB=ON .. +3. Add flag "-DZLIB=ON" when invoking cmake: + + $ cmake -G "Visual Studio 9 2008" -DZLIB=ON .. + If it reports NOTFOUND for zlib_include or zlib_lib, you might haven't put the headers or the .lib file in the right directory. 4) Open the generated protobuf.sln file and build as usual. @@ -93,16 +101,16 @@ The following warnings have been disabled while building the protobuf libraries and compiler. You may have to disable some of them in your own project as well, or live with them. -C4018 - 'expression' : signed/unsigned mismatch -C4146 - unary minus operator applied to unsigned type, result still unsigned -C4244 - Conversion from 'type1' to 'type2', possible loss of data. -C4251 - 'identifier' : class 'type' needs to have dll-interface to be used by - clients of class 'type2' -C4267 - Conversion from 'size_t' to 'type', possible loss of data. -C4305 - 'identifier' : truncation from 'type1' to 'type2' -C4355 - 'this' : used in base member initializer list -C4800 - 'type' : forcing value to bool 'true' or 'false' (performance warning) -C4996 - 'function': was declared deprecated +* C4018 - 'expression' : signed/unsigned mismatch +* C4146 - unary minus operator applied to unsigned type, result still unsigned +* C4244 - Conversion from 'type1' to 'type2', possible loss of data. +* C4251 - 'identifier' : class 'type' needs to have dll-interface to be used by + clients of class 'type2' +* C4267 - Conversion from 'size_t' to 'type', possible loss of data. +* C4305 - 'identifier' : truncation from 'type1' to 'type2' +* C4355 - 'this' : used in base member initializer list +* C4800 - 'type' : forcing value to bool 'true' or 'false' (performance warning) +* C4996 - 'function': was declared deprecated C4251 is of particular note, if you are compiling the Protocol Buffer library as a DLL (see previous section). The protocol buffer library uses templates in @@ -116,3 +124,4 @@ unique, so there should be no problem with this, but MSVC prints warning nevertheless. So, we disable it. Unfortunately, this warning will also be produced when compiling code which merely uses protocol buffers, meaning you may have to disable it in your code too. + -- cgit v1.2.3