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Change the way modules are built so that object paths are relative and use vpath for locating sources (so source paths are also shorter).

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Add some basic documentation for the build system files while we're at it.
This commit is contained in:
px4dev
2013-05-11 11:32:05 -07:00
parent 15aae728e5
commit 196ee8b16f
4 changed files with 110 additions and 24 deletions
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makefiles/module.mk
+31 -20
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@@ -39,6 +39,10 @@
# symbols, as the global namespace is shared between all modules. Normally an
# module will just export one or more <command>_main functions.
#
# IMPORTANT NOTE:
#
# This makefile assumes it is being invoked in the module's output directory.
#
#
# Variables that can be set by the module's module.mk:
@@ -179,26 +183,30 @@ CXXFLAGS += -fvisibility=$(DEFAULT_VISIBILITY) -include $(PX4_INCLUDE_DIR)visibi
#
module: $(MODULE_OBJ) $(MODULE_COMMAND_FILES)
##
## Locate sources (allows relative source paths in module.mk)
##
#define SRC_SEARCH
# $(abspath $(firstword $(wildcard $1) $(wildcard $(MODULE_SRC)/$1) MISSING_$1))
#endef
#
# Locate sources (allows relative source paths in module.mk)
#ABS_SRCS ?= $(foreach src,$(SRCS),$(call SRC_SEARCH,$(src)))
#MISSING_SRCS := $(subst MISSING_,,$(filter MISSING_%,$(ABS_SRCS)))
#ifneq ($(MISSING_SRCS),)
#$(error $(MODULE_MK): missing in SRCS: $(MISSING_SRCS))
#endif
#ifeq ($(ABS_SRCS),)
#$(error $(MODULE_MK): nothing to compile in SRCS)
#endif
#
define SRC_SEARCH
$(abspath $(firstword $(wildcard $1) $(wildcard $(MODULE_SRC)/$1) MISSING_$1))
endef
##
## Object files we will generate from sources
##
#OBJS := $(foreach src,$(ABS_SRCS),$(MODULE_WORK_DIR)$(src).o)
ABS_SRCS ?= $(foreach src,$(SRCS),$(call SRC_SEARCH,$(src)))
MISSING_SRCS := $(subst MISSING_,,$(filter MISSING_%,$(ABS_SRCS)))
ifneq ($(MISSING_SRCS),)
$(error $(MODULE_MK): missing in SRCS: $(MISSING_SRCS))
endif
ifeq ($(ABS_SRCS),)
$(error $(MODULE_MK): nothing to compile in SRCS)
endif
#
# Object files we will generate from sources
#
OBJS := $(foreach src,$(ABS_SRCS),$(MODULE_WORK_DIR)$(src).o)
OBJS = $(addsuffix .o,$(SRCS))
$(info SRCS $(SRCS))
$(info OBJS $(OBJS))
#
# SRCS -> OBJS rules
@@ -206,13 +214,16 @@ OBJS := $(foreach src,$(ABS_SRCS),$(MODULE_WORK_DIR)$(src).o)
$(OBJS): $(GLOBAL_DEPS)
$(filter %.c.o,$(OBJS)): $(MODULE_WORK_DIR)%.c.o: %.c $(GLOBAL_DEPS)
vpath %.c $(MODULE_SRC)
$(filter %.c.o,$(OBJS)): %.c.o: %.c $(GLOBAL_DEPS)
$(call COMPILE,$<,$@)
$(filter %.cpp.o,$(OBJS)): $(MODULE_WORK_DIR)%.cpp.o: %.cpp $(GLOBAL_DEPS)
vpath %.cpp $(MODULE_SRC)
$(filter %.cpp.o,$(OBJS)): %.cpp.o: %.cpp $(GLOBAL_DEPS)
$(call COMPILEXX,$<,$@)
$(filter %.S.o,$(OBJS)): $(MODULE_WORK_DIR)%.S.o: %.S $(GLOBAL_DEPS)
vpath %.S $(MODULE_SRC)
$(filter %.S.o,$(OBJS)): %.S.o: %.S $(GLOBAL_DEPS)
$(call ASSEMBLE,$<,$@)
#