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Difference "Building CppCMS using Visual Studio" ver. 12 versus ver. 13

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## Introduction
In general build on Windows using Microsoft Visual Studio is quite complex due to several factors:
1. Lack of easily accessible already build libraries in both debug and release variants for your MSVC version
2. Need of strict debug/release separation
So in order to make your life while building CppCMS simpler I suggest following rules:
1. Keep strict separation of debug and release installations and 32/64 bit architectures, for example
c:\cppcms_deps\x64\Debug
c:\cppcms_deps\x64\Release
c:\cppcms_deps\x86\Debug
c:\cppcms_deps\x86\Release
Note: pcre, icu and zlib support debug/release mangling of the libraries/dlls for debug/release flavor, but OpenSSL does not. So I strongly recommend to use separate trees to ensure safety.
2. When building with CMake always use "NMake Makefiles" generator to prevent collisions of debug/release methods
3. Start from basic dependencies zlib and pcre that can be built using CMake than go with more complex ones like OpenSSL and ICU if needed.
## Building Dependencies
### Basic Build Dependencies
## Before We Begin
## Building Dependencies
1. Install Visual Studio or Visual Studio build tools
2. Install CMake, make sure it is in global path
3. Install Python 2.x version, make sure it is in global path
4. Optionally install git if you want to build upstream branches.
Checks: open cmd and try to run cmake, python and optionally git - see if it works.
And finally make sure the directories you are building in are not scanned by anti-virus - otherwise you may get some build failures - due to files being locked by AV.
Note: in all builds we will use Visual Studio console - open one for correct architecture.
For example:
- MSVC 2017 64 bit builds open: `x64 Native Tools Command Prompt for VS 2017`
- MSVC 2017 32 bit builds open: `x86 Native Tools Command Prompt for VS 2017`
I assume during this tutorial that you work in one of such a consoles.
### Building PCRE
## Mandatory Dependencies
### PCRE
PCRE comes with CMake build system, however building it correctly may be somewhat tricky.
Download the latest version of PCRE 8.x. Do not use PCRE2, it isn't supported.
Important options to note:
1. Use "NMake Makefiles" generator, default generator is multi flavor one and much harder to use properly.
2. Make sure you **explicitly** specify Release/Debug flavor `-DCMAKE_BUILD_TYPE=Release`
3. Build Shared version of PCRE (i.e. dll) `-DBUILD_SHARED_LIBS=ON`
4. Make sure you put `-DPCRE_SUPPORT_UNICODE_PROPERTIES=ON` option on to enable utf-8 support - otherwise regex tests will fail
Step by step in the console:
Release:
cd \path\to\pcre\soures
mkdir msvc-release-x64
cd msvc-release-x64
cmake -DBUILD_SHARED_LIBS=ON -DPCRE_SUPPORT_UNICODE_PROPERTIES=ON -G"NMake Makefiles" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=c:\cppcms_deps\x64\Release ..
nmake
nmake install
cd ..
Debug:
cd \path\to\pcre\soures
mkdir msvc-debug-x64
cd msvc-debug-x64
cmake -DBUILD_SHARED_LIBS=ON -DPCRE_SUPPORT_UNICODE_PROPERTIES=ON -G"NMake Makefiles" -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=c:\cppcms_deps\x64\Debug ..
nmake
nmake install
cd ..
### Building zlib
### zlib
Fortunately latest zlib versions come with CMake support making it much easier to build with Visual Studio.
1. Use "NMake Makefiles" generator, default generator is multi version and much trickier to use.
2. Make sure you **explicitly** specify Release/Debug flavor `-DCMAKE_BUILD_TYPE=Release`
2. Build Shared version of zlib (i.e. dll) `-DBUILD_SHARED_LIBS=ON`
Step by step:
Open Visual studio command prompt, for example `x64 Native Tools Command Prompt for VS 2017` or `x86 Native Tools Command Prompt for VS 2017` and change directory to location of zlib sources. Create build directory and run the commands:
For example for x64 build
Release
mkdir msvc-release-x64
cd msvc-release-x64
cmake -DBUILD_SHARED_LIBS=ON -G"NMake Makefiles" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=c:\cppcms_deps\x64\Release ..
nmake
nmake install
cd ..
Debug
mkdir msvc-debug-x64
cd msvc-debug-x64
cmake -DBUILD_SHARED_LIBS=ON -G"NMake Makefiles" -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=c:\cppcms_deps\x64\Debug ..
nmake
nmake install
cd ..
### Checking the build results.
After installation of PCRE and zlib you need to get structure like this:
c:\cppcms_deps\x64\Release
c:\cppcms_deps\x64\Release\include
c:\cppcms_deps\x64\Release\include\zlib.h
c:\cppcms_deps\x64\Release\include\pcre.h
...
c:\cppcms_deps\x64\Release\lib
c:\cppcms_deps\x64\Release\lib\zlib.lib
c:\cppcms_deps\x64\Release\lib\pcre.lib
...
c:\cppcms_deps\x64\Release\bin
c:\cppcms_deps\x64\Release\bin\zlib1.dll
c:\cppcms_deps\x64\Release\bin\pcre.dll
...
c:\cppcms_deps\x64\Debug
c:\cppcms_deps\x64\Debug\include
c:\cppcms_deps\x64\Debug\include\zlib.h
c:\cppcms_deps\x64\Debug\include\pcre.h
...
c:\cppcms_deps\x64\Debug\lib
c:\cppcms_deps\x64\Debug\lib\zlibd.lib
c:\cppcms_deps\x64\Debug\lib\pcred.lib
...
c:\cppcms_deps\x64\Debug\bin
c:\cppcms_deps\x64\Debug\bin\zlibd1.dll
c:\cppcms_deps\x64\Debug\bin\pcred.dll
Note - the DLLs and libs with "d" suffix are placed in debug location.
## Optional Dependencies
### OpenSSL
*Warning:* OpenSSL does not mangle its Debug and Release flavors - so make sure you have a separate install prefix for two OpenSSL flavors and never mix them!
First of all you need to install perl as it is basic building and configuration tool. ActivePerl is recommended. Make sure it is in system path. Note: msys2 perl or cygwin perl does not work.
Note: Make sure you open correct MSVC console for x64 and x86 builds.
For 64 bit release build run the command:
perl Configure VC-WIN64A no-asm --prefix=c:\cppcms_deps\x64\Release --openssldir=c:\cppcms_deps\x64\Release
For 64 bit debug build run the command
perl Configure debug-VC-WIN64A no-asm --prefix=c:\cppcms_deps\x64\Release --openssldir=c:\cppcms_deps\x64\Release
For 32 bit release build run the command:
perl Configure VC-WIN32 no-asm --prefix=c:\cppcms_deps\x86\Release --openssldir=c:\cppcms_deps\x86\Release
For 32 bit debug build run the command
perl Configure debug-VC-WIN32 no-asm --prefix=c:\cppcms_deps\x86\Debug --openssldir=c:\cppcms_deps\x86\Debug
Afterwards run:
nmake
nmake install
And between flavors make sure you run
nmake distclean
Notes:
- `VC-WIN64A` and `debug-VC-WIN64A` are 64 bit build flavors for release and debug
- `VC-WIN32` and `debug-VC-WIN32` are32 bit build flavors for release and debug
- no-asm - disable NASM dependency - not really needed
- `--prefix` and `--openssldir` are location of build results
### ICU
Precompiled ICU
BUIDING ICU:
DOWNLOAD ZIP ONLY!!!
set PATH=%PATH%;c:\cygwin64\bin
dos2unix *
dos2unix -f configure
bash runConfigureICU Cygwin/MSVC --prefix=/cygdrive/c/Users/artik/msvc2017/x64/Release
make
make install
make distclean
move dlls from lib to bin
bash runConfigureICU --enable-debug --disable-release Cygwin/MSVC --prefix=/cygdrive/c/Users/artik/msvc2017/x64/Debug
make
make install
make distclean
move dlls from lib to bin
## Building CppCMS
cmake -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Debug -DDISABLE_STATIC=ON -DCMAKE_INCLUDE_PATH=c:\Users\artik\msvc2017\x64\Debug\include -DCMAKE_LIBRARY_PATH=c:\Users\artik\msvc2017\x64\Debug\lib ..
SET PATH=%PATH%;c:\Users\artik\msvc2017\x64\Debug\bin;.\booster\
cmake -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Release -DDISABLE_STATIC=ON -DCMAKE_INCLUDE_PATH=c:\Users\artik\msvc2017\x64\Release\include -DCMAKE_LIBRARY_PATH=c:\Users\artik\msvc2017\x64\Release\lib ..
SET PATH=%PATH%;c:\Users\artik\msvc2017\x64\Release\bin;.\booster\
## References
1. <http://developer.covenanteyes.com/building-openssl-for-visual-studio/>
2. <https://wiki.qt.io/Compiling-ICU-with-MSVC>
3. <https://www.npcglib.org/~stathis/blog/precompiled-icu/>

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