4.1 EDK II Build System
EDK II build system produces binary images that conform to UEFI and PI specification file formats. In some cases, the tools have been extended to follow the Intel Innovation Framework for EFI Specifications. Some binary content may also follow other industry standard specifications, such as ACPI and PCI specifications.
While the build system may seem complex, it was designed to be extremely flexible.
The original build system worked on files within a development WORKSPACE. All content for the build had to be located within the WORKSPACE directory tree.
The build system has been updated to allow the setting of multiple paths that will be searched when attempting to resolve the location of EDK II packages. This new feature allows for more flexibility when designing a tree layout or combining sources from different sources. The new functionality is enabled through the addition of a new environment variable: PACKAGES_PATH.
The PACKAGES_PATH variable is an ordered list of additional search paths using the default path separator of the host OS between each entry ( ";" on Windows, ":" on Linux and OS/X). The path specified by the WORKSPACE variable always has the highest search priority over any PACKAGE_PATH entries. The first path (left to right) in the PACKAGES_PATH list has the highest priority and the last path has the lowest priority.
As soon as a match has been found the build tools will stop searching.
The output of the build system may be located outside of the development workspace. The WORKSPACE, PACKAGES_PATH and EDK_TOOLS_BIN system environment variables contain directory paths that must never contain space characters even though they are permitted by the operating system.
The build system works in the context of a platform, using the Platform Description (DSC) file to define what will get built. When building a single driver, or an application, the DSC file is used to define what will be built, along with the libraries, configuration settings and custom build flags.
All ASCII source files (see Table 14) in the EDK II code base must use the DOS CRLF character sequence for the end-of-line terminator except those that are strictly for GCC, such as assembly files that are only to be processed by *NIX tools that use an extension of ".s" (lower case). Unicode files use the UCS-2 character set.
The Base Tools ASCII source files (C and Python) must use the DOS CRLF character sequence for the end-of-line terminator as well as the DOS batch files with an extension of .bat. The *NIX shell scripts identified by an extension of .sh as well as the scripts in BaseTools/BinWrappers/PosixLike and the BaseTools/Bin/CYGWIN_NT-5.1-i686 directories must always use the Linux LF character for the end-of-line terminator. Apple's Mac* OS/X operating system correctly translates the Linux LF character into the native CR character for the end-of-line terminator.

4.1.1 Development Environments

The EDK II development environments include Windows*, Linux* and OS/X* development workstations. Development workstations must be running an IA32 or X64 operating system. Intel(R) Itanium Processor Family workstations are not supported.
The new build tools allow directories containing EDK II packages to be located anywhere on a developer's workstation. The recommended method for setting up a development structure on a Windows workstation is create a directory in the root of a drive:
mkdir C:\Work
cd C:\Work
The edk2 directory can then be placed in this directory and additional directories for platforms and tools should be placed in the top level directory as well:
set PACKAGES_PATH=C:\Work\edk2;C:\Work\MyPlatform
set EDK_TOOLS_BIN=C:\Work\edk2-BaseTools-win32
In order to complete the setup:
C:\Work> mkdir Conf
C:\Work> edk2\edksetup.bat
After running this command, the configuration files, target.txt, tools_def.txt and build_rule.txt will be placed in the C:\Work\Conf directory.
The EDK II Build output directory is typically created in the WORKSPACE directory (based on configuration set in the DSC files). After executing a build.exe command, the C:\Work\Build directory will be created.
When using this feature, remember the system environment variables, WORKSPACE, PACKAGES_PATH and EDK_TOOLS_BIN must be set before running the edksetup.bat script.

4.1.2 Supported Development Tools

The list of validated Third-Party Compiler Tool chains that can be used with the EDK II build system is documented in the tools_def.template file in the EDK II source tree's BaseTools/Conf directory.
Install the tool chains for compilers and/or additional tools prior to building any image.

4.1.3 Build Process Restrictions

The build process for all development environments must be identical, with the caveat that only applicable EDK II Packages need compile for any given operating system.
Note: All EDK II content is built in the context of a Platform, using a Platform Description (DSC) file to describe what needs to be built, as well as any customization needed for a build. The DSC file is required even though the target may be only an application, a PCI Option ROM or a binary UEFI driver.
System Environment Variables will not be overridden by tools. System Environment Variable names cannot be overloaded - only the value of the System Environment Variable will be used.
There is no restriction on the location of the EDK_TOOLS_PATH, it may be located within a directory identified as the WORKSPACE directory, or in any other location that is accessible on the development workstation.
When using multi-directory feature, the system environment variables, WORKSPACE, PACKAGES_PATH and EDK_TOOLS_BIN must be set before running the edksetup.bat script.
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4.1.1 Development Environments
4.1.2 Supported Development Tools
4.1.3 Build Process Restrictions