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Make:Improve directory generation portability.

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Because of command differences in some build environments the "inline"
method of generating the build directory structure is not portable.
(e.g. in DOS environments the mkdir shell command fails if a directory
already exists, whereas in UNIX environments it succeeds.)

To improve portability we generate the directories needed using make,
but use the "order-only prerequisites" feature of make to prevent writes
of files into the directories generating re-builds, as suggested in the
GNU make Manual (Version 4.1 September 2014).

Change-Id: Ic9af475831063c7fe6f8bccffef184d79e799419
This commit is contained in:
Evan Lloyd 2015-12-03 12:19:30 +00:00
parent 42a45b51aa
commit 51b27702e4
1 changed files with 23 additions and 13 deletions
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36
make_helpers/build_macros.mk
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@ -210,10 +210,8 @@ $(OBJ): $(2)
@echo " CC $$<"
$$(Q)$$(CC) $$(CFLAGS) -D$(IMAGE) -c $$< -o $$@
$(PREREQUISITES): $(2)
$(PREREQUISITES): $(2) | bl$(3)_dirs
@echo " DEPS $$@"
@mkdir -p $(1)
$$(Q)$$(CC) $$(CFLAGS) -M -MT $(OBJ) -MF $$@ $$<
ifdef IS_ANYTHING_TO_BUILD
@ -237,9 +235,8 @@ $(OBJ): $(2)
@echo " AS $$<"
$$(Q)$$(AS) $$(ASFLAGS) -D$(IMAGE) -c $$< -o $$@
$(PREREQUISITES): $(2)
$(PREREQUISITES): $(2) | bl$(3)_dirs
@echo " DEPS $$@"
@mkdir -p $(1)
$$(Q)$$(AS) $$(ASFLAGS) -M -MT $(OBJ) -MF $$@ $$<
ifdef IS_ANYTHING_TO_BUILD
@ -260,9 +257,8 @@ $(1): $(2)
@echo " PP $$<"
$$(Q)$$(AS) $$(ASFLAGS) -P -E -D__LINKER__ -o $$@ $$<
$(PREREQUISITES): $(2)
$(PREREQUISITES): $(2) | $(dir ${1})
@echo " DEPS $$@"
@mkdir -p $$(dir $$@)
$$(Q)$$(AS) $$(ASFLAGS) -M -MT $(1) -MF $$@ $$<
ifdef IS_ANYTHING_TO_BUILD
@ -327,14 +323,28 @@ define MAKE_BL
$(eval DUMP := $(call IMG_DUMP,$(1)))
$(eval BIN := $(call IMG_BIN,$(1)))
$(eval BL_LINKERFILE := $(BL$(call uppercase,$(1))_LINKERFILE))
# We use sort only to get a list of unique object directory names.
# ordering is not relevant but sort removes duplicates.
$(eval TEMP_OBJ_DIRS := $(sort $(BUILD_DIR)/ $(dir ${OBJS})))
# The $(dir ) function leaves a trailing / on the directory names
# We append a . then strip /. from each, to remove the trailing / characters
# This gives names suitable for use as make rule targets.
$(eval OBJ_DIRS := $(subst /.,,$(addsuffix .,$(TEMP_OBJ_DIRS))))
$(eval $(call MAKE_OBJS,$(BUILD_DIR),$(SOURCES),$(1)))
$(eval $(call MAKE_LD,$(LINKERFILE),$(BL_LINKERFILE)))
# Create generators for object directory structure
$(BUILD_DIR):
$$(Q)mkdir -p "$$@"
$(eval $(foreach objd,${OBJ_DIRS},$(call MAKE_PREREQ_DIR,${objd},)))
$(ELF): $(OBJS) $(LINKERFILE)
.PHONY : bl${1}_dirs
# We use order-only prerequisites to ensure that directories are created,
# but do not cause re-builds every time a file is written.
bl${1}_dirs: | ${OBJ_DIRS}
$(eval $(call MAKE_OBJS,$(BUILD_DIR),$(SOURCES),$(1)))
$(eval $(call MAKE_LD,$(LINKERFILE),$(BL_LINKERFILE)))
$(ELF): $(OBJS) $(LINKERFILE) | bl$(1)_dirs
@echo " LD $$@"
@echo 'const char build_message[] = "Built : "$(BUILD_MESSAGE_TIMESTAMP); \
const char version_string[] = "${VERSION_STRING}";' | \
@ -354,7 +364,7 @@ $(BIN): $(ELF)
@echo
.PHONY: bl$(1)
bl$(1): $(BUILD_DIR) $(BIN) $(DUMP)
bl$(1): $(BIN) $(DUMP)
all: bl$(1)