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[build] Allow for named configurations at build time

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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>
This commit is contained in:
Michael Brown
2014-08-19 16:17:25 +01:00
parent 3953ddd2ac
commit c801cb29d6
9 changed files with 85 additions and 2 deletions
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3
src/config/settings.h
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@@ -14,6 +14,9 @@ FILE_LICENCE ( GPL2_OR_LATER );
//#define MEMMAP_SETTINGS /* Memory map settings */
//#define VMWARE_SETTINGS /* VMware GuestInfo settings */
#include <config/named.h>
#include NAMED_CONFIG(settings.h)
#include <config/local/settings.h>
#include LOCAL_NAMED_CONFIG(settings.h)
#endif /* CONFIG_SETTINGS_H */