defined-symbols = $(call find-symbols,$1,awk '$$2!="U"{print $$1}')
undefined-symbols = $(call find-symbols,$1,awk '$$2=="U"{print $$1}')
+WL := -Wl,
+ifdef CONFIG_DARWIN
+whole-archive = $(WL)-force_load,$1
+else
+whole-archive = $(WL)--whole-archive $1 $(WL)--no-whole-archive
+endif
+
# All the .mo objects in -m variables are also added into corresponding -y
# variable in unnest-vars, but filtered out here, when LINK is called.
#
# This is necessary because the exectuable itself may not use the function, in
# which case the function would not be linked in. Then the DSO loading will
# fail because of the missing symbol.
-process-archive-undefs = $(filter-out %.a %.mo,$1) \
+process-archive-undefs = $(filter-out %.a %.fa %.mo,$1) \
$(addprefix $(WL_U), \
- $(filter $(call defined-symbols,$(filter %.a, $1)), \
+ $(filter $(call defined-symbols,$(filter %.a %.fa, $1)), \
$(call undefined-symbols,$(filter %.mo,$1)))) \
- $(filter %.a,$1)
+ $(foreach l,$(filter %.fa,$1),$(call whole-archive,$l)) \
+ $(filter %.a,$1)
extract-libs = $(strip $(foreach o,$(filter-out %.mo,$1),$($o-libs)))
expand-objs = $(strip $(sort $(filter %.o,$1)) \
$(filter-out %.o %.mo,$1))
%.o: %.c
+ @mkdir -p $(dir $@)
$(call quiet-command,$(CC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
$(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
-c -o $@ $<,"CC","$(TARGET_DIR)$@")
%.o: %.cc
$(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
- $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
+ $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CXXFLAGS) $($@-cflags) \
-c -o $@ $<,"CXX","$(TARGET_DIR)$@")
%.o: %.cpp
$(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
- $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
+ $(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CXXFLAGS) $($@-cflags) \
-c -o $@ $<,"CXX","$(TARGET_DIR)$@")
%.o: %.m
modules:
%$(EXESUF): %.o
- $(call LINK,$(filter %.o %.a %.mo, $^))
+ $(call LINK,$(filter %.o %.a %.mo %.fa, $^))
%.a:
$(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"AR","$(TARGET_DIR)$@")
$(error $o added in $v but $o-objs is not set)))
$(shell mkdir -p ./ $(sort $(dir $($v))))
# Include all the .d files
- $(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$($v))))
+ $(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$(filter %.o,$($v)))))
$(eval $v := $(filter-out %/,$($v))))
endef
%.json: %.json.in
$(call GEN_SUBST)
+
+# Support for building multiple output files by atomically executing
+# a single rule which depends on several input files (so the rule
+# will be executed exactly once, not once per output file, and
+# not multiple times in parallel.) For more explanation see:
+# https://www.cmcrossroads.com/article/atomic-rules-gnu-make
+
+# Given a space-separated list of filenames, create the name of
+# a 'sentinel' file to use to indicate that they have been built.
+# We use fixed text on the end to avoid accidentally triggering
+# automatic pattern rules, and . on the start to make the file
+# not show up in ls output.
+sentinel = .$(subst $(SPACE),_,$(subst /,_,$1)).sentinel.
+
+# Define an atomic rule that builds multiple outputs from multiple inputs.
+# To use:
+# $(call atomic,out1 out2 ...,in1 in2 ...)
+# <TAB>rule to do the operation
+#
+# Make 4.3 will have native support for this, and you would be able
+# to instead write:
+# out1 out2 ... &: in1 in2 ...
+# <TAB>rule to do the operation
+#
+# The way this works is that it creates a make rule
+# "out1 out2 ... : sentinel-file ; @:" which says that the sentinel
+# depends on the dependencies, and the rule to do that is "do nothing".
+# Then we have a rule
+# "sentinel-file : in1 in2 ..."
+# whose commands start with "touch sentinel-file" and then continue
+# with the rule text provided by the user of this 'atomic' function.
+# The foreach... is there to delete the sentinel file if any of the
+# output files don't exist, so that we correctly rebuild in that situation.
+atomic = $(eval $1: $(call sentinel,$1) ; @:) \
+ $(call sentinel,$1) : $2 ; @touch $$@ \
+ $(foreach t,$1,$(if $(wildcard $t),,$(shell rm -f $(call sentinel,$1))))
+
+print-%:
+ @echo '$*=$($*)'