mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
e0f3728d81
Sphinx will corrupt its doctree cache if we run two copies
of it in parallel. In commit 6bda415c10 we worked
around this by having separate doctrees for 'html' vs 'manpage'
runs. However now that we have more than one manpage produced
from a single manual we can run into this again when trying
to produce the two manpages.
Use the trick described in 'Atomic Rules in GNU Make'
https://www.cmcrossroads.com/article/atomic-rules-gnu-make
to ensure that we only run the Sphinx manpage builder once
for each manual, even if we're producing several manpages.
This fixes doctree corruption in parallel builds and also
avoids pointlessly running Sphinx more often than we need to.
(In GNU Make 4.3 there is builtin support for this, via
the "&:" syntax, but we can't wait for that to be available
in all the distros we support...)
The generic "one invocation for multiple output files"
machinery is provided as a macro named 'atomic' in rules.mak;
we then wrap this in a more specific macro for defining
the rule and dependencies for the manpages in a Sphinx
manual, to avoid excessive repetition.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20200124162606.8787-2-peter.maydell@linaro.org
437 lines
16 KiB
Makefile
437 lines
16 KiB
Makefile
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# These are used when we want to do substitutions without confusing Make
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NULL :=
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SPACE := $(NULL) #
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COMMA := ,
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# Don't use implicit rules or variables
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# we have explicit rules for everything
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MAKEFLAGS += -rR
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# Files with this suffixes are final, don't try to generate them
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# using implicit rules
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%/trace-events:
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%.hx:
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%.py:
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%.objs:
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%.d:
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%.h:
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%.c:
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%.cc:
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%.cpp:
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%.m:
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%.mak:
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clean-target:
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# Flags for dependency generation
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QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
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# Compiler searches the source file dir first, but in vpath builds
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# we need to make it search the build dir too, before any other
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# explicit search paths. There are two search locations in the build
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# dir, one absolute and the other relative to the compiler working
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# directory. These are the same for target-independent files, but
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# different for target-dependent ones.
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QEMU_LOCAL_INCLUDES = -iquote $(BUILD_DIR)/$(@D) -iquote $(@D)
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WL_U := -Wl,-u,
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find-symbols = $(if $1, $(sort $(shell $(NM) -P -g $1 | $2)))
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defined-symbols = $(call find-symbols,$1,awk '$$2!="U"{print $$1}')
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undefined-symbols = $(call find-symbols,$1,awk '$$2=="U"{print $$1}')
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# All the .mo objects in -m variables are also added into corresponding -y
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# variable in unnest-vars, but filtered out here, when LINK is called.
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#
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# The .mo objects are supposed to be linked as a DSO, for module build. So here
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# they are only used as a placeholders to generate those "archive undefined"
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# symbol options (-Wl,-u,$symbol_name), which are the archive functions
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# referenced by the code in the DSO.
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#
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# Also the presence in -y variables will also guarantee they are built before
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# linking executables that will load them. So we can look up symbol reference
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# in LINK.
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#
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# This is necessary because the exectuable itself may not use the function, in
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# which case the function would not be linked in. Then the DSO loading will
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# fail because of the missing symbol.
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process-archive-undefs = $(filter-out %.a %.mo,$1) \
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$(addprefix $(WL_U), \
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$(filter $(call defined-symbols,$(filter %.a, $1)), \
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$(call undefined-symbols,$(filter %.mo,$1)))) \
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$(filter %.a,$1)
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extract-libs = $(strip $(foreach o,$(filter-out %.mo,$1),$($o-libs)))
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expand-objs = $(strip $(sort $(filter %.o,$1)) \
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$(foreach o,$(filter %.mo,$1),$($o-objs)) \
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$(filter-out %.o %.mo,$1))
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%.o: %.c
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$(call quiet-command,$(CC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
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$(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
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-c -o $@ $<,"CC","$(TARGET_DIR)$@")
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%.o: %.rc
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$(call quiet-command,$(WINDRES) -I. -o $@ $<,"RC","$(TARGET_DIR)$@")
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# If we have a CXX we might have some C++ objects, in which case we
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# must link with the C++ compiler, not the plain C compiler.
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LINKPROG = $(or $(CXX),$(CC))
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LINK = $(call quiet-command, $(LINKPROG) $(CFLAGS) $(QEMU_LDFLAGS) -o $@ \
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$(call process-archive-undefs, $1) \
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$(version-obj-y) $(call extract-libs,$1) $(LIBS),"LINK","$(TARGET_DIR)$@")
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%.o: %.S
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$(call quiet-command,$(CCAS) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
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$(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) \
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-c -o $@ $<,"CCAS","$(TARGET_DIR)$@")
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%.o: %.cc
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$(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
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$(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
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-c -o $@ $<,"CXX","$(TARGET_DIR)$@")
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%.o: %.cpp
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$(call quiet-command,$(CXX) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
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$(QEMU_CXXFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
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-c -o $@ $<,"CXX","$(TARGET_DIR)$@")
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%.o: %.m
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$(call quiet-command,$(OBJCC) $(QEMU_LOCAL_INCLUDES) $(QEMU_INCLUDES) \
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$(QEMU_CFLAGS) $(QEMU_DGFLAGS) $(CFLAGS) $($@-cflags) \
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-c -o $@ $<,"OBJC","$(TARGET_DIR)$@")
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%.o: %.dtrace
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$(call quiet-command,dtrace -o $@ -G -s $<,"GEN","$(TARGET_DIR)$@")
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DSO_OBJ_CFLAGS := -fPIC -DBUILD_DSO
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module-common.o: CFLAGS += $(DSO_OBJ_CFLAGS)
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%$(DSOSUF): QEMU_LDFLAGS += $(LDFLAGS_SHARED)
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%$(DSOSUF): %.mo
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$(call LINK,$^)
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@# Copy to build root so modules can be loaded when program started without install
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$(if $(findstring /,$@),$(call quiet-command,cp $@ $(subst /,-,$@),"CP","$(subst /,-,$@)"))
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LD_REL := $(CC) -nostdlib $(LD_REL_FLAGS)
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%.mo:
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$(call quiet-command,$(LD_REL) -o $@ $^,"LD","$(TARGET_DIR)$@")
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.PHONY: modules
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modules:
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%$(EXESUF): %.o
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$(call LINK,$(filter %.o %.a %.mo, $^))
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%.a:
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$(call quiet-command,rm -f $@ && $(AR) rcs $@ $^,"AR","$(TARGET_DIR)$@")
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# Usage: $(call quiet-command,command and args,"NAME","args to print")
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# This will run "command and args", and either:
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# if V=1 just print the whole command and args
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# otherwise print the 'quiet' output in the format " NAME args to print"
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# NAME should be a short name of the command, 7 letters or fewer.
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# If called with only a single argument, will print nothing in quiet mode.
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quiet-command-run = $(if $(V),,$(if $2,printf " %-7s %s\n" $2 $3 && ))$1
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quiet-@ = $(if $(V),,@)
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quiet-command = $(quiet-@)$(call quiet-command-run,$1,$2,$3)
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# cc-option
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# Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
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cc-option = $(if $(shell $(CC) $1 $2 -S -o /dev/null -xc /dev/null \
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>/dev/null 2>&1 && echo OK), $2, $3)
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cc-c-option = $(if $(shell $(CC) $1 $2 -c -o /dev/null -xc /dev/null \
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>/dev/null 2>&1 && echo OK), $2, $3)
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VPATH_SUFFIXES = %.c %.h %.S %.cc %.cpp %.m %.mak %.texi %.sh %.rc Kconfig% %.json.in
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set-vpath = $(if $1,$(foreach PATTERN,$(VPATH_SUFFIXES),$(eval vpath $(PATTERN) $1)))
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# install-prog list, dir
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define install-prog
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$(INSTALL_DIR) "$2"
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$(INSTALL_PROG) $1 "$2"
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$(if $(STRIP),$(STRIP) $(foreach T,$1,"$2/$(notdir $T)"),)
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endef
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# find-in-path
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# Usage: $(call find-in-path, prog)
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# Looks in the PATH if the argument contains no slash, else only considers one
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# specific directory. Returns an # empty string if the program doesn't exist
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# there.
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find-in-path = $(if $(findstring /, $1), \
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$(wildcard $1), \
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$(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
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# Logical functions (for operating on y/n values like CONFIG_FOO vars)
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# Inputs to these must be either "y" (true) or "n" or "" (both false)
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# Output is always either "y" or "n".
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# Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
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# Logical NOT
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lnot = $(if $(subst n,,$1),n,y)
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# Logical AND
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land = $(if $(findstring yy,$1$2),y,n)
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# Logical OR
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lor = $(if $(findstring y,$1$2),y,n)
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# Logical XOR (note that this is the inverse of leqv)
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lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
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# Logical equivalence (note that leqv "","n" is true)
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leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
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# Logical if: like make's $(if) but with an leqv-like test
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lif = $(if $(subst n,,$1),$2,$3)
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# String testing functions: inputs to these can be any string;
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# the output is always either "y" or "n". Leading and trailing whitespace
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# is ignored when comparing strings.
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# String equality
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eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
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# String inequality
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ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
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# Emptiness/non-emptiness tests:
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isempty = $(if $1,n,y)
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notempty = $(if $1,y,n)
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# Generate files with tracetool
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TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
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# Generate timestamp files for .h include files
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config-%.h: config-%.h-timestamp
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@cmp $< $@ >/dev/null 2>&1 || cp $< $@
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config-%.h-timestamp: config-%.mak $(SRC_PATH)/scripts/create_config
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$(call quiet-command, sh $(SRC_PATH)/scripts/create_config < $< > $@,"GEN","$(TARGET_DIR)config-$*.h")
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.PHONY: clean-timestamp
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clean-timestamp:
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rm -f *.timestamp
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clean: clean-timestamp
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# will delete the target of a rule if commands exit with a nonzero exit status
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.DELETE_ON_ERROR:
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# save-vars
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# Usage: $(call save-vars, vars)
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# Save each variable $v in $vars as save-vars-$v, save their object's
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# variables, then clear $v. saved-vars-$v contains the variables that
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# where saved for the objects, in order to speedup load-vars.
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define save-vars
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$(foreach v,$1,
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$(eval save-vars-$v := $(value $v))
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$(eval saved-vars-$v := $(foreach o,$($v), \
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$(if $($o-cflags), $o-cflags $(eval save-vars-$o-cflags := $($o-cflags))$(eval $o-cflags := )) \
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$(if $($o-libs), $o-libs $(eval save-vars-$o-libs := $($o-libs))$(eval $o-libs := )) \
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$(if $($o-objs), $o-objs $(eval save-vars-$o-objs := $($o-objs))$(eval $o-objs := ))))
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$(eval $v := ))
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endef
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# load-vars
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# Usage: $(call load-vars, vars, add_var)
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# Load the saved value for each variable in @vars, and the per object
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# variables.
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# Append @add_var's current value to the loaded value.
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define load-vars
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$(eval $2-new-value := $(value $2))
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$(foreach v,$1,
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$(eval $v := $(value save-vars-$v))
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$(foreach o,$(saved-vars-$v),
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$(eval $o := $(save-vars-$o)) $(eval save-vars-$o := ))
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$(eval save-vars-$v := )
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$(eval saved-vars-$v := ))
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$(eval $2 := $(value $2) $($2-new-value))
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endef
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# fix-paths
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# Usage: $(call fix-paths, obj_path, src_path, vars)
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# Add prefix @obj_path to all objects in @vars, and add prefix @src_path to all
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# directories in @vars.
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define fix-paths
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$(foreach v,$3,
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$(foreach o,$($v),
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$(if $($o-libs),
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$(eval $1$o-libs := $($o-libs)))
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$(if $($o-cflags),
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$(eval $1$o-cflags := $($o-cflags)))
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$(if $($o-objs),
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$(eval $1$o-objs := $(addprefix $1,$($o-objs)))))
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$(eval $v := $(addprefix $1,$(filter-out %/,$($v))) \
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$(addprefix $2,$(filter %/,$($v)))))
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endef
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# unnest-var-recursive
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# Usage: $(call unnest-var-recursive, obj_prefix, vars, var)
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#
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# Unnest @var by including subdir Makefile.objs, while protect others in @vars
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# unchanged.
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#
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# @obj_prefix is the starting point of object path prefix.
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#
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define unnest-var-recursive
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$(eval dirs := $(sort $(filter %/,$($3))))
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$(eval $3 := $(filter-out %/,$($3)))
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$(foreach d,$(dirs:%/=%),
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$(call save-vars,$2)
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$(eval obj := $(if $1,$1/)$d)
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$(eval -include $(SRC_PATH)/$d/Makefile.objs)
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$(call fix-paths,$(if $1,$1/)$d/,$d/,$2)
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$(call load-vars,$2,$3)
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$(call unnest-var-recursive,$1,$2,$3))
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endef
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# unnest-vars
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# Usage: $(call unnest-vars, obj_prefix, vars)
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#
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# @obj_prefix: object path prefix, can be empty, or '..', etc. Don't include
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# ending '/'.
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#
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# @vars: the list of variable names to unnest.
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#
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# This macro will scan subdirectories's Makefile.objs, include them, to build
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# up each variable listed in @vars.
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#
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# Per object and per module cflags and libs are saved with relative path fixed
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# as well, those variables include -libs, -cflags and -objs. Items in -objs are
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# also fixed to relative path against SRC_PATH plus the prefix @obj_prefix.
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#
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# All nested variables postfixed by -m in names are treated as DSO variables,
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# and will be built as modules, if enabled.
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#
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# A simple example of the unnest:
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#
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# obj_prefix = ..
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# vars = hot cold
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# hot = fire.o sun.o season/
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# cold = snow.o water/ season/
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#
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# Unnest through a faked source directory structure:
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#
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# SRC_PATH
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# ├── water
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# │ └── Makefile.objs──────────────────┐
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# │ │ hot += steam.o │
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# │ │ cold += ice.mo │
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# │ │ ice.mo-libs := -licemaker │
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# │ │ ice.mo-objs := ice1.o ice2.o │
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# │ └──────────────────────────────┘
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# │
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# └── season
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# └── Makefile.objs──────┐
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# │ hot += summer.o │
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# │ cold += winter.o │
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# └──────────────────┘
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#
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# In the end, the result will be:
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#
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# hot = ../fire.o ../sun.o ../season/summer.o
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# cold = ../snow.o ../water/ice.mo ../season/winter.o
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# ../water/ice.mo-libs = -licemaker
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# ../water/ice.mo-objs = ../water/ice1.o ../water/ice2.o
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#
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# Note that 'hot' didn't include 'water/' in the input, so 'steam.o' is not
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# included.
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#
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define unnest-vars
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# In the case of target build (i.e. $1 == ..), fix path for top level
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# Makefile.objs objects
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$(if $1,$(call fix-paths,$1/,,$2))
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# Descend and include every subdir Makefile.objs
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$(foreach v, $2,
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$(call unnest-var-recursive,$1,$2,$v)
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# Pass the .mo-cflags and .mo-libs along to its member objects
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$(foreach o, $(filter %.mo,$($v)),
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$(foreach p,$($o-objs),
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$(if $($o-cflags), $(eval $p-cflags += $($o-cflags)))
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$(if $($o-libs), $(eval $p-libs += $($o-libs))))))
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# For all %.mo objects that are directly added into -y, just expand them
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$(foreach v,$(filter %-y,$2),
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$(eval $v := $(foreach o,$($v),$(if $($o-objs),$($o-objs),$o))))
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$(foreach v,$(filter %-m,$2),
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# All .o found in *-m variables are single object modules, create .mo
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# for them
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$(foreach o,$(filter %.o,$($v)),
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$(eval $(o:%.o=%.mo)-objs := $o))
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# Now unify .o in -m variable to .mo
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$(eval $v := $($v:%.o=%.mo))
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$(eval modules-m += $($v))
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# For module build, build shared libraries during "make modules"
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# For non-module build, add -m to -y
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$(if $(CONFIG_MODULES),
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$(foreach o,$($v),
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$(eval $($o-objs): CFLAGS += $(DSO_OBJ_CFLAGS))
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$(eval $o: $($o-objs)))
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$(eval $(patsubst %-m,%-y,$v) += $($v))
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$(eval modules: $($v:%.mo=%$(DSOSUF))),
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$(eval $(patsubst %-m,%-y,$v) += $(call expand-objs, $($v)))))
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# Post-process all the unnested vars
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$(foreach v,$2,
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$(foreach o, $(filter %.mo,$($v)),
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# Find all the .mo objects in variables and add dependency rules
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# according to .mo-objs. Report error if not set
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$(if $($o-objs),
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$(eval $(o:%.mo=%$(DSOSUF)): module-common.o $($o-objs)),
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$(error $o added in $v but $o-objs is not set)))
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$(shell mkdir -p ./ $(sort $(dir $($v))))
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# Include all the .d files
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$(eval -include $(patsubst %.o,%.d,$(patsubst %.mo,%.d,$($v))))
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$(eval $v := $(filter-out %/,$($v))))
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endef
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TEXI2MAN = $(call quiet-command, \
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perl -Ww -- $(SRC_PATH)/scripts/texi2pod.pl $(TEXI2PODFLAGS) $< $@.pod && \
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$(POD2MAN) --section=$(subst .,,$(suffix $@)) --center=" " --release=" " $@.pod > $@, \
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"GEN","$@")
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%.1:
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$(call TEXI2MAN)
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%.7:
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$(call TEXI2MAN)
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%.8:
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$(call TEXI2MAN)
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GEN_SUBST = $(call quiet-command, \
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sed -e "s!@libexecdir@!$(libexecdir)!g" < $< > $@, \
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"GEN","$@")
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%.json: %.json.in
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$(call GEN_SUBST)
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|
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# Support for building multiple output files by atomically executing
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# a single rule which depends on several input files (so the rule
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# will be executed exactly once, not once per output file, and
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|
# not multiple times in parallel.) For more explanation see:
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# https://www.cmcrossroads.com/article/atomic-rules-gnu-make
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|
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# Given a space-separated list of filenames, create the name of
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|
# a 'sentinel' file to use to indicate that they have been built.
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|
# We use fixed text on the end to avoid accidentally triggering
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|
# automatic pattern rules, and . on the start to make the file
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|
# not show up in ls output.
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sentinel = .$(subst $(SPACE),_,$(subst /,_,$1)).sentinel.
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|
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|
# Define an atomic rule that builds multiple outputs from multiple inputs.
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|
# To use:
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|
# $(call atomic,out1 out2 ...,in1 in2 ...)
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|
# <TAB>rule to do the operation
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|
#
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|
# Make 4.3 will have native support for this, and you would be able
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|
# to instead write:
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|
# out1 out2 ... &: in1 in2 ...
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|
# <TAB>rule to do the operation
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|
#
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|
# 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
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|
# "sentinel-file : in1 in2 ..."
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|
# whose commands start with "touch sentinel-file" and then continue
|
|
# with the rule text provided by the user of this 'atomic' function.
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|
# The foreach... is there to delete the sentinel file if any of the
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|
# output files don't exist, so that we correctly rebuild in that situation.
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|
atomic = $(eval $1: $(call sentinel,$1) ; @:) \
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|
$(call sentinel,$1) : $2 ; @touch $$@ \
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|
$(foreach t,$1,$(if $(wildcard $t),,$(shell rm -f $(call sentinel,$1))))
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