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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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40
src/Makefile.housekeeping
View File

@@ -689,6 +689,34 @@ privkey_DEPS += $(PRIVKEY_LIST)
CFLAGS_privkey += $(if $(PRIVKEY),-DPRIVATE_KEY="\"$(PRIVKEY_INC)\"")
# (Single-element) list of named configurations
#
CONFIG_LIST := $(BIN)/.config.list
ifeq ($(wildcard $(CONFIG_LIST)),)
CONFIG_OLD := <invalid>
else
CONFIG_OLD := $(shell cat $(CONFIG_LIST))
endif
ifneq ($(CONFIG_OLD),$(CONFIG))
$(shell $(ECHO) "$(CONFIG)" > $(CONFIG_LIST))
endif
$(CONFIG_LIST) : $(MAKEDEPS)
VERYCLEANUP += $(CONFIG_LIST)
# Named configurations
#
ifneq ($(CONFIG),)
ifneq ($(wildcard config/$(CONFIG)),)
CFLAGS += -DCONFIG=$(CONFIG)
endif
CFLAGS += -DLOCAL_CONFIG=$(CONFIG)
endif
config/named.h : $(CONFIG_LIST)
$(Q)$(TOUCH) $@
# These files use .incbin inline assembly to include a binary file.
# Unfortunately ccache does not detect this dependency and caches
# builds even when the binary file has changed.
@@ -1260,8 +1288,16 @@ CLEANUP += $(EINFO)
#
# Local configs
#
config/local/%.h :
$(Q)touch $@
CONFIG_HEADERS := $(patsubst config/%,%,$(wildcard config/*.h))
$(foreach HEADER,$(CONFIG_HEADERS),config/local/$(HEADER)) :
$(Q)$(TOUCH) $@
ifneq ($(CONFIG),)
$(foreach HEADER,$(CONFIG_HEADERS),config/local/$(CONFIG)/$(HEADER)) :
$(Q)$(MKDIR) -p $(dir $@)
$(Q)$(TOUCH) $@
endif
###############################################################################
#