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I need to create a static library (.lib) file by assembling.asm file. I have Visual Studio 2010. If it is a static lib: You simple add the object files with the librarian.
- I am trying to create a static library in Visual Studio that contains other sources which paths are in Additional Include Directories defined. I can build and create the library without problems, but when I try to use it in another project, it seems that it does not include the sources which are defined in Additional Include Directories, so It.
- So the user will need to have the package Visual C Redistributable for Visual Studio installed to run the app. The first thing to do is to link the static version of the run-time library with your app, for that change MD to MT (for Release) in the Project Properties - C/C - Code Generation - Runtime Library.
Make sure you have first followed theinstructions to download Skia.
Skia uses GN toconfigure its builds.
is_official_build and Third-party Dependencies
Most users of Skia should set is_official_build=true, and most developersshould leave it to its false default.
This mode configures Skia in a way that’s suitable to ship: an optimized buildwith no debug symbols, dynamically linked against its third-party dependenciesusing the ordinary library search path.
In contrast, the developer-oriented default is an unoptimized build with fulldebug symbols and all third-party dependencies built from source and embeddedinto libskia. This is how we do all our manual and automated testing.
Skia offers several features that make use of third-party libraries, likelibpng, libwebp, or libjpeg-turbo to decode images, or ICU and sftnly to subsetfonts. All these third-party dependencies are optional and can be controlled bya GN argument that looks something like skia_use_foo for appropriate foo.
If skia_use_foo is enabled, enabling skia_use_system_foo will build and linkSkia against the headers and libraries found on the system paths.is_official_build=true enables all skia_use_system_foo by default. You canuse extra_cflags and extra_ldflags to add include or library paths ifneeded.
Supported and Preferred Compilers
While Skia should compile with GCC, MSVC, and other compilers, a number ofroutines in Skia’s software backend have been written to run fastest whencompiled with Clang. If you depend on software rasterization, image decoding, orcolor space conversion and compile Skia with a compiler other than Clang, youwill see dramatically worse performance. This choice was only a matter ofprioritization; there is nothing fundamentally wrong with non-Clang compilers.So if this is a serious issue for you, please let us know on the mailing list.
Skia makes use of C++17 language features (compiles with -std=c++17 flag) andthus requires a C++17 compatible compiler. Clang 5 and later implement all ofthe features of the c++17 standard. Older compilers that lack C++17 support mayproduce non-obvious compilation errors. You can configure your build to usespecific executables for cc and cxx invocations using e.g.--args='cc='clang-6.0' cxx='clang++6.0' GN build arguments, as illustrated inQuickstart. This can be useful for building Skia without needing tomodify your machine’s default compiler toolchain.
Quickstart
Run gn gen to generate your build files. As arguments to gn gen, pass a namefor your build directory, and optionally --args= to configure the build type.
To build Skia as a static library in a build directory named out/Static:
To build Skia as a shared library (DLL) in a build directory named out/Shared:
If you find that you don’t have bin/gn, make sure you’ve run:
For a list of available build arguments, take a look at gn/skia.gni, or run:
GN allows multiple build folders to coexist; each build can be configuredseparately as desired. For example:
Once you have generated your build files, run Ninja to compile and link Skia:
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If some header files are missing, install the corresponding dependencies:
To pull new changes and rebuild:
Android
To build Skia for Android you need anAndroid NDK.
If you do not have an NDK and have access to CIPD, you can use one of thesecommands to fetch the NDK our bots use:
When generating your GN build files, pass the path to your ndk and yourdesired target_cpu:
Other arguments like is_debug and is_component_build continue to work.Tweaking ndk_api gives you access to newer Android features like Vulkan.
To test on an Android device, push the binary and resources over, and run itas normal. You may find bin/droid convenient.
ChromeOS
To cross-compile Skia for arm ChromeOS devices the following is needed:
- Clang 4 or newer
- An armhf sysroot
- The (E)GL lib files on the arm chromebook to link against.
To compile Skia for an x86 ChromeOS device, one only needs Clang and the libfiles.
If you have access to CIPD, you can fetch all of these as follows:
If you don’t have authorization to use those assets, then see the README.mdfiles forarmhf_sysroot,chromebook_arm_gles,andchromebook_x86_64_glesfor instructions on creating those assets.
Once those files are in place, generate the GN args that resemble the following:
Compile dm (or another executable of your choice) with ninja, as per usual.
Push the binary to a chromebook via ssh andrun dm as normal using the gles GPU config.
Most chromebooks by default have their home directory partition marked asnoexec. To avoid “permission denied” errors, remember to run something like:
Mac
Mac users may want to pass --ide=xcode to bin/gn gen to generate an Xcodeproject.
iOS
Run GN to generate your build files. Set target_os='ios' to build for iOS.This defaults to target_cpu='arm64'. Choosing x64 targets the iOS simulator.
This will also package (and for devices, sign) iOS test binaries. This defaultsto a Google signing identity and provisioning profile. To use a different oneset the GN args skia_ios_identity to match your code signing identity andskia_ios_profile to the name of your provisioning profile, e.g.
A list of identities can be found by typing security find-identity on thecommand line. The name of the provisioning profile should be available on theApple Developer site. Alternatively, skia_ios_profile can be the absolute pathto the mobileprovision file.
If you find yourself missing a Google signing identity or provisioning profile,you’ll want to have a read through go/appledev.
For signed packages ios-deploy makes installing and running them on a deviceeasy:
Alternatively you can generate an Xcode project by passing --ide=xcode tobin/gn gen. If you are using Xcode version 10 or later, you may need to go toProject Settings... and verify that Build System: is set toLegacy Build System.
Deploying to a device with an OS older than the current SDK can be done bysetting the ios_min_target arg:
where <major>.<minor> is the iOS version on the device, e.g., 12.0 or 11.4.
Windows
Skia can build on Windows with Visual Studio 2017 or 2019. If GN is unable tolocate either of those, it will print an error message. In that case, you canpass your VC path to GN via win_vc.
Skia can be compiled with the freeBuild Tools for Visual Studio 2017 or 2019.
The bots use a packaged 2019 toolchain, which Googlers can download like this:
You can then pass the VC and SDK paths to GN by setting your GN args:
This toolchain is the only way we support 32-bit builds, by also settingtarget_cpu='x86'.
The Skia build assumes that the PATHEXT environment variable contains “.EXE”.
Highly Recommended: Build with clang-cl
Skia uses generated code that is only optimized when Skia is built with clang.Other compilers get generic unoptimized code.
Setting the cc and cxx gn args is not sufficient to build with clang-cl.These variables are ignored on Windows. Instead set the variable clang_win toyour LLVM installation directory. If you installed the prebuilt LLVM downloadedfrom here in thedefault location that would be:
Follow the standard Windows path specification and not MinGW convention (e.g.C:Program FilesLLVM not /c/Program Files/LLVM
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Visual Studio Solutions
If you use Visual Studio, you may want to pass --ide=vs to bin/gn gen togenerate all.sln. That solution will exist within the GN directory for thespecific configuration, and will only build/run that configuration.
If you want a Visual Studio Solution that supports multiple GN configurations,there is a helper script. It requires that all of your GN directories be insidethe out directory. First, create all of your GN configurations as usual. Pass--ide=vs when running bin/gn gen for each one. Then:
This creates a new dedicated output directory and solution fileout/sln/skia.sln. It has one solution configuration for each GN configuration,and supports building and running any of them. It also adjusts syntaxhighlighting of inactive code blocks based on preprocessor definitions from theselected solution configuration.
Windows ARM64
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There is early, experimental support forWindows 10 on ARM. Thiscurrently requires (a recent version of) MSVC, and theVisual C++ compilers and libraries for ARM64 individual component in theVisual Studio Installer. For Googlers, the win_toolchain asset includes theARM64 compiler.
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To use that toolchain, set the target_cpu GN argument to 'arm64'. Note thatOpenGL is not supported by Windows 10 on ARM, so Skia’s GL backends are stubbedout, and will not work. ANGLE is supported:
This will produce a build of Skia that can use the software or ANGLE backends,in DM. Viewer only works when launched with --backend angle, because thesoftware backend tries to use OpenGL to display the window contents.
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CMake
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We have added a GN-to-CMake translator mainly for use with IDEs that like CMakeproject descriptions. This is not meant for any purpose beyond development.