You can set many of the compiler options for a project by choosing ProjectOptions and selecting a compiler-related page. For example, most of the options on both the Delphi Delphi Compiler page and the C++ Compiler page correspond to compiler options that are described in the online Help for that page.  

To specify additional compiler options, you can invoke the compiler from the command line. For a complete list of the Delphi compiler options and information about running the Delphi compiler from the command line, see Delphi Language Guide in the Contents pane.  

To display the current compiler options in the Messages window each time you compile your project, choose ToolsOptionsEnvironment Options and select Show command line. The next time you compile a project, the Messages window displays the command used to compile the project and the response file. The response file lists the compiler options and the files to be compiled. 

After you compile a project, you can display information about it by choosing ProjectInformation. The resulting Information dialog box displays the number of lines of source code compiled, the byte size of your code and data, the stack and file sizes, and the compile status of the project.

As you compile a project, compiler messages are displayed in the Messages window. For an explanation of a message, select the message and press F1.

You can save certain project options as a named build configuration. You can specify the active build configuration for each of your projects, and you can change the active build configuration during project development. For example, you can set project options specific to debugging your project, save the options as the Debug build configuration, and then apply them as the active configuration while you debug the project. 

The options in a build configuration are available on the Compiler, Compiler Messages, Linker, and Conditionals/Directories pages of the ProjectOptions dialog box.  

By default, the IDE includes three configurations: Base, Debug, and Release. You can modify the options in any of these default configurations, and you can create new build configurations of your own. To apply a selected build configuration to specific projects or project groups, either use the Build Configuration Manager or select the build configuration from the drop-down list on any of the build-related ProjectOptions pages.

In addition to build configurations, option sets are a way for you to save and selectively apply the build-related settings you have made on the ProjectOptions dialogs. Option sets are disk files with the extension .optset. You can apply an option set to the current build configuration by reference or by value.

When you explicitly build a project, the IDE calls MSBuild, the Microsoft build engine. The build process is entirely transparent to developers. MSBuild is called as part of the Compile,Build, and Run commands available on the Project and Run menus. However, you can also invoke MSBuild.exe from the command line or by using the RAD Studio Command Prompt, available on the Start menu.

MSBuild Overview 

Build Configurations Overview 

Building Packages 

Build Configuration Manager 

Creating and Modifying Named Build Configurations 

Building a Project Using an MSBuild Command 

Option Sets: Overview 

Option Sets: Creating