[linker] Add mechanism for subsystem-dependent configuration options

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

256
src/config/config.c Normal file
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@@ -0,0 +1,256 @@
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2, or (at
* your option) any later version.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <config/general.h>
#include <config/console.h>
/** @file
*
* Configuration options
*
* This file contains macros that pull various objects into the link
* based on definitions in configuration header files. Ideally it
* should be the only place in gPXE where one might need to use #ifdef
* for compile-time options.
*
* In the fairly common case where an object should only be considered
* for inclusion if the subsystem it depends on is present, its
* configuration macros should be placed in a file named
* <tt>config_<i>subsystem</i>.c</tt>, where @e subsystem is the
* object basename of the main source file for that subsystem. The
* build system will pull in that file if @c subsystem.c is included
* in the final gPXE executable built.
*/
/*
* Build ID string calculations
*
*/
#undef XSTR
#undef STR
#define XSTR(s) STR(s)
#define STR(s) #s
#ifdef BUILD_SERIAL
#include "config/.buildserial.h"
#define BUILD_SERIAL_STR " #" XSTR(BUILD_SERIAL_NUM)
#else
#define BUILD_SERIAL_STR ""
#endif
#ifdef BUILD_ID
#define BUILD_ID_STR " " BUILD_ID
#else
#define BUILD_ID_STR ""
#endif
#if defined(BUILD_ID) || defined(BUILD_SERIAL)
#define BUILD_STRING " [build" BUILD_ID_STR BUILD_SERIAL_STR "]"
#else
#define BUILD_STRING ""
#endif
/*
* Drag in all requested console types
*
*/
#ifdef CONSOLE_PCBIOS
REQUIRE_OBJECT ( bios_console );
#endif
#ifdef CONSOLE_SERIAL
REQUIRE_OBJECT ( serial_console );
#endif
#ifdef CONSOLE_DIRECT_VGA
REQUIRE_OBJECT ( video_subr );
#endif
#ifdef CONSOLE_BTEXT
REQUIRE_OBJECT ( btext );
#endif
#ifdef CONSOLE_PC_KBD
REQUIRE_OBJECT ( pc_kbd );
#endif
#ifdef CONSOLE_SYSLOG
REQUIRE_OBJECT ( syslog );
#endif
#ifdef CONSOLE_EFI
REQUIRE_OBJECT ( efi_console );
#endif
/*
* Drag in all requested network protocols
*
*/
#ifdef NET_PROTO_IPV4
REQUIRE_OBJECT ( ipv4 );
#endif
/*
* Drag in all requested download protocols
*
*/
#ifdef DOWNLOAD_PROTO_TFTP
REQUIRE_OBJECT ( tftp );
#endif
#ifdef DOWNLOAD_PROTO_NFS
REQUIRE_OBJECT ( nfs );
#endif
#ifdef DOWNLOAD_PROTO_HTTP
REQUIRE_OBJECT ( http );
#endif
#ifdef DOWNLOAD_PROTO_HTTPS
REQUIRE_OBJECT ( https );
#endif
#ifdef DOWNLOAD_PROTO_FTP
REQUIRE_OBJECT ( ftp );
#endif
#ifdef DOWNLOAD_PROTO_TFTM
REQUIRE_OBJECT ( tftm );
#endif
#ifdef DOWNLOAD_PROTO_SLAM
REQUIRE_OBJECT ( slam );
#endif
/*
* Drag in all requested SAN boot protocols
*
*/
#ifdef SANBOOT_PROTO_ISCSI
REQUIRE_OBJECT ( iscsiboot );
#endif
#ifdef SANBOOT_PROTO_AOE
REQUIRE_OBJECT ( aoeboot );
#endif
#ifdef SANBOOT_PROTO_IB_SRP
REQUIRE_OBJECT ( ib_srpboot );
#endif
/*
* Drag in all requested resolvers
*
*/
#ifdef DNS_RESOLVER
REQUIRE_OBJECT ( dns );
#endif
#ifdef NMB_RESOLVER
REQUIRE_OBJECT ( nmb );
#endif
/*
* Drag in all requested image formats
*
*/
#ifdef IMAGE_NBI
REQUIRE_OBJECT ( nbi );
#endif
#ifdef IMAGE_ELF
REQUIRE_OBJECT ( elfboot );
#endif
#ifdef IMAGE_FREEBSD
REQUIRE_OBJECT ( freebsd );
#endif
#ifdef IMAGE_MULTIBOOT
REQUIRE_OBJECT ( multiboot );
#endif
#ifdef IMAGE_AOUT
REQUIRE_OBJECT ( aout );
#endif
#ifdef IMAGE_WINCE
REQUIRE_OBJECT ( wince );
#endif
#ifdef IMAGE_PXE
REQUIRE_OBJECT ( pxe_image );
#endif
#ifdef IMAGE_SCRIPT
REQUIRE_OBJECT ( script );
#endif
#ifdef IMAGE_BZIMAGE
REQUIRE_OBJECT ( bzimage );
#endif
#ifdef IMAGE_ELTORITO
REQUIRE_OBJECT ( eltorito );
#endif
#ifdef IMAGE_COMBOOT
REQUIRE_OBJECT ( comboot );
REQUIRE_OBJECT ( com32 );
REQUIRE_OBJECT ( comboot_call );
REQUIRE_OBJECT ( com32_call );
REQUIRE_OBJECT ( com32_wrapper );
REQUIRE_OBJECT ( comboot_resolv );
#endif
#ifdef IMAGE_EFI
REQUIRE_OBJECT ( efi_image );
#endif
/*
* Drag in all requested commands
*
*/
#ifdef AUTOBOOT_CMD
REQUIRE_OBJECT ( autoboot_cmd );
#endif
#ifdef NVO_CMD
REQUIRE_OBJECT ( nvo_cmd );
#endif
#ifdef CONFIG_CMD
REQUIRE_OBJECT ( config_cmd );
#endif
#ifdef IFMGMT_CMD
REQUIRE_OBJECT ( ifmgmt_cmd );
#endif
#ifdef ROUTE_CMD
REQUIRE_OBJECT ( route_cmd );
#endif
#ifdef IMAGE_CMD
REQUIRE_OBJECT ( image_cmd );
#endif
#ifdef DHCP_CMD
REQUIRE_OBJECT ( dhcp_cmd );
#endif
#ifdef SANBOOT_CMD
REQUIRE_OBJECT ( sanboot_cmd );
#endif
#ifdef LOGIN_CMD
REQUIRE_OBJECT ( login_cmd );
#endif
#ifdef TIME_CMD
REQUIRE_OBJECT ( time_cmd );
#endif
#ifdef DIGEST_CMD
REQUIRE_OBJECT ( digest_cmd );
#endif
#ifdef PXE_CMD
REQUIRE_OBJECT ( pxe_cmd );
#endif
/*
* Drag in miscellaneous objects
*
*/
#ifdef NULL_TRAP
REQUIRE_OBJECT ( nulltrap );
#endif
#ifdef GDBSERIAL
REQUIRE_OBJECT ( gdbidt );
REQUIRE_OBJECT ( gdbserial );
REQUIRE_OBJECT ( gdbstub_cmd );
#endif
#ifdef GDBUDP
REQUIRE_OBJECT ( gdbidt );
REQUIRE_OBJECT ( gdbudp );
REQUIRE_OBJECT ( gdbstub_cmd );
#endif
/*
* Drag in objects that are always required, but not dragged in via
* symbol dependencies.
*
*/
REQUIRE_OBJECT ( device );
REQUIRE_OBJECT ( embedded );