Update docs to add build-mode: none analysis for C/C++ (#55889)

Author: saritai

content/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages.md

@@ -308,7 +308,15 @@ If you added manual build steps for compiled languages and {% data variables.pro
 
 ## Building C/C++
 
-{% ifversion codeql-no-build %}{% data variables.product.prodname_codeql %} supports build modes `autobuild` or `manual` for C/C++ code.
+{% ifversion codeql-no-build %}{% data variables.product.prodname_codeql %} supports build modes {% ifversion codeql-no-build-c-cpp %}`none`, {% endif %}`autobuild` or `manual` for C/C++ code.
+
+{% ifversion codeql-no-build-c-cpp %}
+
+When you enable default setup for a repository that contains C/C++ code, the build mode is set to `none` automatically.
+
+>[!NOTE] Support of build mode `none` for C/C++ codebases is currently in {% data variables.release-phases.public_preview %} and subject to change.
+
+{% endif %}
 
 ### Autobuild summary for C/C++{% endif %}
 

content/code-security/codeql-cli/getting-started-with-the-codeql-cli/preparing-your-code-for-codeql-analysis.md

@@ -201,10 +201,10 @@ In addition, for {% data variables.code-scanning.no_build_support %}, there is a
 The {% data variables.product.prodname_codeql_cli %} includes autobuilders for {% data variables.code-scanning.compiled_languages %} code. {% data variables.product.prodname_codeql %} autobuilders allow you to build projects for compiled languages without specifying any build commands. When an autobuilder is invoked, {% data variables.product.prodname_codeql %} examines the source for evidence of a build system and attempts to run the optimal set of commands required to extract a database. For more information, see [AUTOTITLE](/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages#about-autobuild).
 
 An autobuilder is invoked automatically when you execute `codeql database create` for a compiled language if you don’t include a
-`--command` option{% ifversion codeql-no-build %} or set `--build-mode none`{% endif %}. For example, for a C/C++ codebase, you could simply run:
+`--command` option{% ifversion codeql-no-build %} or set `--build-mode none`{% endif %}. For example, for a Swift codebase, you could simply run:
 
 ```shell
-codeql database create --language=cpp <output-folder>/cpp-database
+codeql database create --language=swift <output-folder>/swift-database
 ```
 
 If a codebase uses a standard build system, relying on an autobuilder is often the simplest way to create a database. For sources that require non-standard build steps, you may need to explicitly define each step in the command line.

data/features/codeql-no-build-c-cpp.yml

@@ -0,0 +1,5 @@
+# Reference: #16543 (C/C++ public preview)
+
+versions:
+  fpt: '*'
+  ghec: '*'

data/variables/code-scanning.yml

@@ -7,7 +7,7 @@ codeql_workflow: 'CodeQL analysis workflow'
 tool_status_page: 'tool status page'
 
 # List of compiled languages supported for `no-build` extraction
-no_build_support: '{% ifversion codeql-no-build-csharp %}C# and{% endif %} Java'
+no_build_support: '{% ifversion codeql-no-build-c-cpp %}C/C++, {% endif %}{% ifversion codeql-no-build-csharp %}C# and{% endif %} Java'
 
 # List of compiled languages
 compiled_languages: 'C/C++, C#, Go, Java, Kotlin, and Swift'