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Build instructions for Windows

Prepare folder
Install third party software
Clone source code and prepare libraries
Build the project
Qt Visual Studio Tools

Prepare folder

Choose an empty folder for the future build, for example D:\TBuild. It will be named BuildPath in the rest of this document. Create two folders there, BuildPath\ThirdParty and BuildPath\Libraries.

All commands (if not stated otherwise) will be launched from x86 Native Tools Command Prompt for VS 2019.bat (should be in Start Menu > Visual Studio 2019 menu folder). Pay attention not to use any other Command Prompt.

Obtain your API credentials

You will require api_id and api_hash to access the Telegram API servers. To learn how to obtain them click here.

Install third party software

Download Strawberry Perl installer from http://strawberryperl.com/ and install to BuildPath\ThirdParty\Strawberry
Download NASM installer from http://www.nasm.us and install to BuildPath\ThirdParty\NASM
Download Yasm executable from http://yasm.tortall.net/Download.html, rename to yasm.exe and put to BuildPath\ThirdParty\yasm
Download MSYS2 installer from http://www.msys2.org/ and install to BuildPath\ThirdParty\msys64
Download jom archive from http://download.qt.io/official_releases/jom/jom.zip and unpack to BuildPath\ThirdParty\jom
Download Python 2.7 installer from https://www.python.org/downloads/ and install to BuildPath\ThirdParty\Python27
Download CMake installer from https://cmake.org/download/ and install to BuildPath\ThirdParty\cmake
Download Ninja executable from https://github.com/ninja-build/ninja/releases/download/v1.7.2/ninja-win.zip and unpack to BuildPath\ThirdParty\Ninja
Download Git installer from https://git-scm.com/download/win and install it.
Download NuGet executable from https://dist.nuget.org/win-x86-commandline/latest/nuget.exe and put to BuildPath\ThirdParty\NuGet

Open x86 Native Tools Command Prompt for VS 2019.bat, go to BuildPath and run

cd ThirdParty
git clone https://github.com/desktop-app/patches.git
cd patches
git checkout 87a2e9ee07
cd ..

git clone https://chromium.googlesource.com/external/gyp
cd gyp
git checkout 9f2a7bb1
git apply ../patches/gyp.diff
cd ..

python -m pip install pywin32

Add GYP, Ninja and NuGet to your PATH:

Open Control Panel -> System -> Advanced system settings.
Press Environment Variables....
Select Path.
Press Edit.
Add BuildPath\ThirdParty\gyp value.
Add BuildPath\ThirdParty\Ninja value.
Add BuildPath\ThirdParty\NuGet value.

Clone source code and prepare libraries

Open x86 Native Tools Command Prompt for VS 2019.bat, go to BuildPath and run

SET PATH=%cd%\ThirdParty\Strawberry\perl\bin;%cd%\ThirdParty\Python27;%cd%\ThirdParty\NASM;%cd%\ThirdParty\jom;%cd%\ThirdParty\cmake\bin;%cd%\ThirdParty\yasm;%PATH%

git clone --recursive https://github.com/telegramdesktop/tdesktop.git

mkdir Libraries
cd Libraries

git clone https://github.com/desktop-app/patches.git
cd patches
git checkout 87a2e9ee07
cd ..

git clone https://github.com/desktop-app/lzma.git
cd lzma\C\Util\LzmaLib
msbuild LzmaLib.sln /property:Configuration=Debug /property:Platform="x86"
msbuild LzmaLib.sln /property:Configuration=Release /property:Platform="x86"
cd ..\..\..\..

git clone https://github.com/openssl/openssl.git openssl_1_1_1
cd openssl_1_1_1
git checkout OpenSSL_1_1_1-stable
perl Configure no-shared no-tests debug-VC-WIN32
nmake
mkdir out32.dbg
move libcrypto.lib out32.dbg
move libssl.lib out32.dbg
move ossl_static.pdb out32.dbg\ossl_static
nmake clean
move out32.dbg\ossl_static out32.dbg\ossl_static.pdb
perl Configure no-shared no-tests VC-WIN32
nmake
mkdir out32
move libcrypto.lib out32
move libssl.lib out32
move ossl_static.pdb out32
cd ..

git clone https://github.com/desktop-app/zlib.git
cd zlib\contrib\vstudio\vc14
msbuild zlibstat.vcxproj /property:Configuration=Debug /property:Platform="x86"
msbuild zlibstat.vcxproj /property:Configuration=ReleaseWithoutAsm /property:Platform="x86"
cd ..\..\..\..

git clone -b v4.0.1-rc2 https://github.com/mozilla/mozjpeg.git
cd mozjpeg
cmake . ^
    -G "Visual Studio 16 2019" ^
    -A Win32 ^
    -DWITH_JPEG8=ON ^
    -DPNG_SUPPORTED=OFF
cmake --build . --config Debug
cmake --build . --config Release
cd ..

git clone https://github.com/telegramdesktop/openal-soft.git
cd openal-soft
git checkout wasapi_exact_device_time
cd build
cmake .. ^
    -G "Visual Studio 16 2019" ^
    -A Win32 ^
    -D LIBTYPE:STRING=STATIC ^
    -D FORCE_STATIC_VCRT=ON
msbuild OpenAL.vcxproj /property:Configuration=Debug
msbuild OpenAL.vcxproj /property:Configuration=RelWithDebInfo
cd ..\..

git clone https://github.com/google/breakpad
cd breakpad
git checkout a1dbcdcb43
git apply ../patches/breakpad.diff
cd src
git clone https://github.com/google/googletest testing
cd client\windows
gyp --no-circular-check breakpad_client.gyp --format=ninja
cd ..\..
ninja -C out/Debug common crash_generation_client exception_handler
ninja -C out/Release common crash_generation_client exception_handler
cd tools\windows\dump_syms
gyp dump_syms.gyp
msbuild dump_syms.vcxproj /property:Configuration=Release
cd ..\..\..\..\..

git clone https://github.com/telegramdesktop/opus.git
cd opus
git checkout tdesktop
cd win32\VS2015
msbuild opus.sln /property:Configuration=Debug /property:Platform="Win32"
msbuild opus.sln /property:Configuration=Release /property:Platform="Win32"
cd ..\..\..

git clone https://github.com/desktop-app/rnnoise.git
cd rnnoise
mkdir out
cd out
cmake -A Win32 ..
cmake --build . --config Debug
cmake --build . --config Release
cd ..\..

cd ..
SET PATH_BACKUP_=%PATH%
SET PATH=%cd%\ThirdParty\msys64\usr\bin;%PATH%
cd Libraries

git clone https://github.com/FFmpeg/FFmpeg.git ffmpeg
cd ffmpeg
git checkout release/4.4

set CHERE_INVOKING=enabled_from_arguments
set MSYS2_PATH_TYPE=inherit
bash --login ../patches/build_ffmpeg_win.sh

SET PATH=%PATH_BACKUP_%
cd ..

git clone https://github.com/desktop-app/tg_angle.git
cd tg_angle
git checkout f7b17cd
mkdir out
cd out
mkdir Debug
cd Debug
cmake -G Ninja ^
    -DCMAKE_BUILD_TYPE=Debug ^
    -DTG_ANGLE_SPECIAL_TARGET=win ^
    -DTG_ANGLE_ZLIB_INCLUDE_PATH=%cd%/../../../zlib ../..
ninja
cd ..
mkdir Release
cd Release
cmake -G Ninja ^
    -DCMAKE_BUILD_TYPE=Release ^
    -DTG_ANGLE_SPECIAL_TARGET=win ^
    -DTG_ANGLE_ZLIB_INCLUDE_PATH=%cd%/../../../zlib ../..
ninja
cd ..\..\..

SET LibrariesPath=%cd%
git clone git://code.qt.io/qt/qt5.git qt_5_15_2
cd qt_5_15_2
perl init-repository --module-subset=qtbase,qtimageformats
git checkout v5.15.2
git submodule update qtbase qtimageformats
cd qtbase
for /r %i in (..\..\patches\qtbase_5_15_2\*) do git apply %i
cd ..

configure ^
    -prefix "%LibrariesPath%\Qt-5.15.2" ^
    -debug-and-release ^
    -force-debug-info ^
    -opensource ^
    -confirm-license ^
    -static ^
    -static-runtime ^
    -opengl es2 -no-angle ^
    -I "%LibrariesPath%\tg_angle\include" ^
    -D "KHRONOS_STATIC=" ^
    -D "DESKTOP_APP_QT_STATIC_ANGLE=" ^
    QMAKE_LIBS_OPENGL_ES2_DEBUG="%LibrariesPath%\tg_angle\out\Debug\tg_angle.lib %LibrariesPath%\zlib\contrib\vstudio\vc14\x86\ZlibStatDebug\zlibstat.lib d3d9.lib dxgi.lib dxguid.lib" ^
    QMAKE_LIBS_OPENGL_ES2_RELEASE="%LibrariesPath%\tg_angle\out\Release\tg_angle.lib %LibrariesPath%\zlib\contrib\vstudio\vc14\x86\ZlibStatReleaseWithoutAsm\zlibstat.lib d3d9.lib dxgi.lib dxguid.lib" ^
    -egl ^
    QMAKE_LIBS_EGL_DEBUG="%LibrariesPath%\tg_angle\out\Debug\tg_angle.lib %LibrariesPath%\zlib\contrib\vstudio\vc14\x86\ZlibStatDebug\zlibstat.lib d3d9.lib dxgi.lib dxguid.lib Gdi32.lib User32.lib" ^
    QMAKE_LIBS_EGL_RELEASE="%LibrariesPath%\tg_angle\out\Release\tg_angle.lib %LibrariesPath%\zlib\contrib\vstudio\vc14\x86\ZlibStatReleaseWithoutAsm\zlibstat.lib d3d9.lib dxgi.lib dxguid.lib Gdi32.lib User32.lib" ^
    -openssl-linked ^
    -I "%LibrariesPath%\openssl_1_1_1\include" ^
    OPENSSL_LIBS_DEBUG="%LibrariesPath%\openssl_1_1_1\out32.dbg\libssl.lib %LibrariesPath%\openssl_1_1_1\out32.dbg\libcrypto.lib Ws2_32.lib Gdi32.lib Advapi32.lib Crypt32.lib User32.lib" ^
    OPENSSL_LIBS_RELEASE="%LibrariesPath%\openssl_1_1_1\out32\libssl.lib %LibrariesPath%\openssl_1_1_1\out32\libcrypto.lib Ws2_32.lib Gdi32.lib Advapi32.lib Crypt32.lib User32.lib" ^
    -I "%LibrariesPath%\mozjpeg" ^
    LIBJPEG_LIBS_DEBUG="%LibrariesPath%\mozjpeg\Debug\jpeg-static.lib" ^
    LIBJPEG_LIBS_RELEASE="%LibrariesPath%\mozjpeg\Release\jpeg-static.lib" ^
    -mp ^
    -nomake examples ^
    -nomake tests ^
    -platform win32-msvc

jom -j8
jom -j8 install
cd ..

git clone https://github.com/desktop-app/tg_owt.git
cd tg_owt
git checkout 91d836dc84
git submodule init
git submodule update
mkdir out
cd out
mkdir Debug
cd Debug
cmake -G Ninja ^
    -DCMAKE_BUILD_TYPE=Debug ^
    -DTG_OWT_BUILD_AUDIO_BACKENDS=OFF ^
    -DTG_OWT_SPECIAL_TARGET=win ^
    -DTG_OWT_LIBJPEG_INCLUDE_PATH=%cd%/../../../mozjpeg ^
    -DTG_OWT_OPENSSL_INCLUDE_PATH=%cd%/../../../openssl_1_1_1/include ^
    -DTG_OWT_OPUS_INCLUDE_PATH=%cd%/../../../opus/include ^
    -DTG_OWT_FFMPEG_INCLUDE_PATH=%cd%/../../../ffmpeg ../..
ninja
cd ..
mkdir Release
cd Release
cmake -G Ninja ^
    -DCMAKE_BUILD_TYPE=Release ^
    -DTG_OWT_BUILD_AUDIO_BACKENDS=OFF ^
    -DTG_OWT_SPECIAL_TARGET=win ^
    -DTG_OWT_LIBJPEG_INCLUDE_PATH=%cd%/../../../mozjpeg ^
    -DTG_OWT_OPENSSL_INCLUDE_PATH=%cd%/../../../openssl_1_1_1/include ^
    -DTG_OWT_OPUS_INCLUDE_PATH=%cd%/../../../opus/include ^
    -DTG_OWT_FFMPEG_INCLUDE_PATH=%cd%/../../../ffmpeg ../..
ninja
cd ..\..\..

Build the project

Go to BuildPath\tdesktop\Telegram and run (using your api_id and api_hash)

configure.bat -D TDESKTOP_API_ID=YOUR_API_ID -D TDESKTOP_API_HASH=YOUR_API_HASH -D DESKTOP_APP_USE_PACKAGED=OFF -D DESKTOP_APP_DISABLE_CRASH_REPORTS=OFF

Open BuildPath\tdesktop\out\Telegram.sln in Visual Studio 2019
Select Telegram project and press Build > Build Telegram (Debug and Release configurations)
The result Telegram.exe will be located in D:\TBuild\tdesktop\out\Debug (and Release)

Qt Visual Studio Tools

For better debugging you may want to install Qt Visual Studio Tools:

Open Extensions -> Manage Extensions
Go to Online tab
Search for Qt
Install Qt Visual Studio Tools extension

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