Note: Your site administrator must enable code scanning for your GitHub Enterprise Server instance before you can use this feature. If you want to use GitHub Actions to scan your code, the site administrator must also enable GitHub Actions and set up the infrastructure required. For more information, see "Configuring code scanning for your appliance."
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 "Configuring code scanning for a repository."
Typically, you don't need to edit the generated workflow file for code scanning. However, if required, you can edit the workflow to customize some of the settings. For example, you can edit GitHub's CodeQL analysis workflow to specify the frequency of scans, the languages or directories to scan, and what CodeQL code scanning looks for in your code. You might also need to edit the CodeQL analysis workflow if you use a specific set of commands to compile your code. For general information about configuring code scanning and editing workflow files, see "Customizing 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 languages, CodeQL analyzes the source files in your repository that are built. For any of these languages, you can disable autobuild
and instead use custom build commands in order to analyze only the files that are built by these custom commands.
For the supported compiled languages, you can use the autobuild
action in the CodeQL analysis workflow to build your code. This avoids you having to specify explicit build commands for C/C++, C#, and Java.
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.
Note: If you use self-hosted runners for GitHub Actions, you may need to install additional software to use the autobuild
process. Additionally, if your repository requires a specific version of a build tool, you may need to install it manually. For more information, see "Specifications for GitHub-hosted runners".
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:
- Invoke
MSBuild.exe
on the solution (.sln
) or project (.vcxproj
) file closest to the root. Ifautobuild
detects multiple solution or project files at the same (shortest) depth from the top level directory, it will attempt to build all of them. - 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:
- Look for a build system in the root directory.
- If none are found, search subdirectories for a unique directory with a build system for C/C++.
- 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:
- Invoke
dotnet build
on the solution (.sln
) or project (.csproj
) file closest to the root. - Invoke
MSbuild
(Linux) orMSBuild.exe
(Windows) on the solution or project file closest to the root. Ifautobuild
detects multiple solution or project files at the same (shortest) depth from the top level directory, it will attempt to build all of them. - 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:
- Search for a build file in the root directory. Check for Gradle then Maven then Ant build files.
- Run the first build file found. If both Gradle and Maven files are present, the Gradle file is used.
- 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 "Customizing 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 your site administrator.