Allow named configurations to be specified via the CONFIG=... build parameter. For headers in config/*.h which support named configurations, the following files will be included when building with CONFIG=<name>: - config/defaults/<platform>.h (e.g. config/defaults/pcbios.h) - config/<header>.h - config/<name>/<header>.h (only if the directory config/<name> exists) - config/local/<header>.h (autocreated if necessary) - config/local/<name>/<header>.h (autocreated if necessary) This mechanism allows for predefined named configurations to be checked in to the source tree, as a directory config/<name> containing all of the required header files. The mechanism also allows for users to define multiple local configurations, by creating header files in the directory config/local/<name>. Note that the config/*.h files which are used only to configure internal iPXE APIs (e.g. config/ioapi.h) cannot be modified via a named configuration. This avoids rebuilding the entire iPXE codebase whenever switching to a different named configuration. Inspired-by: Robin Smidsrød <robin@smidsrod.no> Tested-by: Robin Smidsrød <robin@smidsrod.no> Signed-off-by: Michael Brown <mcb30@ipxe.org>tags/v1.20.1
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