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[linker] Add mechanism for subsystem-dependent configuration options

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It is often the case that some module of gPXE is only relevant if the
subsystem it depends on is already being included. For instance,
commands to manage wireless interfaces are quite useless if no
compiled-in driver has pulled in the wireless networking stack. There
may be a user-modifiable configuration options for these dependent
modules, but even if enabled, they should not be included when they
would be useless.

Solve this by allowing the creation of config_subsystem.c, for
configuration directives like those in the global config.c that should
only be considered when subsystem.c is included in the final gPXE
build.

For consistency, move core/config.c to the config/ directory, where
the other config_subsystem.c files will eventually reside.

Signed-off-by: Marty Connor <mdc@etherboot.org>
This commit is contained in:
Joshua Oreman
2009-08-06 18:52:06 -07:00
committed by Marty Connor
parent 572e61754a
commit 9a0bd0711f
3 changed files with 24 additions and 0 deletions
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5
src/include/compiler.h
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@@ -159,10 +159,15 @@
#define PREFIX_OBJECT( _prefix ) _C2 ( _prefix, OBJECT )
#define OBJECT_SYMBOL PREFIX_OBJECT ( obj_ )
#define REQUEST_EXPANDED( _sym ) REQUEST_SYMBOL ( _sym )
#define CONFIG_SYMBOL PREFIX_OBJECT ( obj_config_ )
/** Always provide the symbol for the current object (defined by -DOBJECT) */
PROVIDE_SYMBOL ( OBJECT_SYMBOL );
/** Pull in an object-specific configuration file if available */
REQUEST_EXPANDED ( CONFIG_SYMBOL );
/** Explicitly require another object */
#define REQUIRE_OBJECT( _obj ) REQUIRE_SYMBOL ( obj_ ## _obj )