Configuring the CodeQL workflow for compiled languages

About the CodeQL analysis workflow and compiled languages

You set up GitHub to run code scanning for your repository by adding a GitHub Actions workflow to the repository. For CodeQL code scanning, you add the CodeQL analysis workflow. For more information, see "Setting up code scanning for a repository."

一般情况下� 需编辑 code scanning 的默认工作流程。 但是，如果需要，您可以编辑工作流程以自定义某些设置。 例如，您可以编辑 GitHub 的 CodeQL analysis workflow 来指定扫描频率、要扫描的语言或目录，以及 CodeQL code scanning 在代� �中的查找内容。 如果您使用一组特定的命令来编译代� �，您可能还需要编辑 CodeQL analysis workflow。 For general information about configuring code scanning and editing workflow files, see "Configuring code scanning" and "Learn GitHub Actions."

About autobuild for CodeQL

Code scanning works by running queries against one or more databases. Each database contains a representation of all of the code in a single language in your repository.
For the compiled languages C/C++, C#, and Java, the process of populating this database involves building the code and extracting data. For these three languages, CodeQL analyzes the source files in your repository that are built. CodeQL also runs a build for Go projects to set up the project, but then analyzes all Go files in the repository, not just the files that are built. For any of these languages, including Go, you can disable autobuild and instead use custom build commands in order to analyze only the files that are built by these custom commands.

对于受支持的编译语言，� 可使用 CodeQL analysis workflow 中的 autobuild 操作来构建代� �。 这避免了为 C/C++、C# 和 Java 指定显式生成命令。

If your workflow uses a language matrix, autobuild attempts to build each of the compiled languages listed in the matrix. Without a matrix autobuild attempts to build the supported compiled language that has the most source files in the repository. With the exception of Go, analysis of other compiled languages in your repository will fail unless you supply explicit build commands.

C/C++

Supported system type	System name
Operating system	Windows, macOS, and Linux
Build system	Windows: MSbuild and build scripts Linux and macOS: Autoconf, Make, CMake, qmake, Meson, Waf, SCons, Linux Kbuild, and build scripts

The behavior of the autobuild step varies according to the operating system that the extraction runs on. On Windows, the autobuild step attempts to autodetect a suitable build method for C/C++ using the following approach:

1. Invoke MSBuild.exe on the solution (.sln) or project (.vcxproj) file closest to the root. If autobuild detects multiple solution or project files at the same (shortest) depth from the top level directory, it will attempt to build all of them.
2. Invoke a script that looks like a build script—build.bat, build.cmd, and build.exe (in that order).

On Linux and macOS, the autobuild step reviews the files present in the repository to determine the build system used:

1. Look for a build system in the root directory.
2. If none are found, search subdirectories for a unique directory with a build system for C/C++.
3. Run an appropriate command to configure the system.

C#

Supported system type	System name
Operating system	Windows and Linux
Build system	.NET and MSbuild, as well as build scripts

The autobuild process attempts to autodetect a suitable build method for C# using the following approach:

1. Invoke dotnet build on the solution (.sln) or project (.csproj) file closest to the root.
2. Invoke MSbuild (Linux) or MSBuild.exe (Windows) on the solution or project file closest to the root. If autobuild detects multiple solution or project files at the same (shortest) depth from the top level directory, it will attempt to build all of them.
3. Invoke a script that looks like a build script—build and build.sh (in that order, for Linux) or build.bat, build.cmd, and build.exe (in that order, for Windows).

Java

Supported system type	System name
Operating system	Windows, macOS, and Linux (no restriction)
Build system	Gradle, Maven and Ant

The autobuild process tries to determine the build system for Java codebases by applying this strategy:

1. Search for a build file in the root directory. Check for Gradle then Maven then Ant build files.
2. Run the first build file found. If both Gradle and Maven files are present, the Gradle file is used.
3. Otherwise, search for build files in direct subdirectories of the root directory. If only one subdirectory contains build files, run the first file identified in that subdirectory (using the same preference as for 1). If more than one subdirectory contains build files, report an error.

Adding build steps for a compiled language

If autobuild fails, or you want to analyze a different set of source files from those built by the autobuild process, you'll need to remove the autobuild step from the workflow, and manually add build steps. For C/C++, C#, Go, and Java projects, CodeQL will analyze whatever source code is built by your specified build steps. For information on how to edit the workflow file, see "Configuring code scanning."

After removing the autobuild step, uncomment the run step and add build commands that are suitable for your repository. The workflow run step runs command-line programs using the operating system's shell. You can modify these commands and add more commands to customize the build process.

- run: |
  make bootstrap
  make release

For more information about the run keyword, see "Workflow syntax for GitHub Actions."

If your repository contains multiple compiled languages, you can specify language-specific build commands. For example, if your repository contains C/C++, C# and Java, and autobuild correctly builds C/C++ and C# but fails to build Java, you could use the following configuration in your workflow, after the init step. This specifies build steps for Java while still using autobuild for C/C++ and C#:

- if: matrix.language == 'cpp' || matrix.language == 'csharp' 
  name: Autobuild
  uses: github/codeql-action/autobuild@v1

- if: matrix.language == 'java' 
  name: Build Java
  run: |
    make bootstrap
    make release

For more information about the if conditional, see "Workflow syntax for GitHub Actions."

For more tips and tricks about why autobuild won't build your code, see "Troubleshooting the CodeQL workflow."

If you added manual build steps for compiled languages and code scanning is still not working on your repository, contact � 的网站管理员.