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242 lines
8.3 KiB
Makefile
242 lines
8.3 KiB
Makefile
################################################################################
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#
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# Makefile for the Swift implementation of MAL.
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#
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# The MAL project consists of building up a dialect/subset of Clojure over a
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# series of steps. Each step implements a new feature or concept in an easily
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# understandable and approachable manner. Each step can be built on its own and
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# tested. Each step is built from a step-specific "step.swift" file and a set
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# of files common to all steps.
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#
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# The general approach in this file is to discover the set of "step" source
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# files (step0_repl.swift, etc.), and build corresponding executable files
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# (step0_repl, etc) from them and from the set of supporting Swift files.
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# Since the set of "step" files is discovered on-the-fly, the rules to make
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# those files are also generated on-the-fly using $(eval).
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#
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# The various "step0_repl.swift", etc., source files are actually generated
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# from a file called "templates/step.swift". Since each "step" file
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# incrementally builds towards the final, complete "step" file,
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# "templates/step.swift" is -- for the most part -- a copy of this final "step"
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# file with each line annotated with the step in which that line is introduced.
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# Through the use of a simple filter program, the "templates/step.swift" file
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# can then be processed to produce each intermediate "step" file. This Makefile
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# takes care of performing that processing any time "templates/step.swift"
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# changes.
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#
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# MAKE TARGETS:
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#
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# all:
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# Make all step targets, (re)generating source files if needed.
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# alls:
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# (Re)generate source files, if needed.
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# step0_repl, step1_read_print, etc.:
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# Make the corresponding step target.
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# s0...sN:
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# Shortcuts for the previous targets.
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# step0_repl.swift, step1_read_print.swift, etc.:
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# (Re)generate source files for the corresponding step target, if
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# needed.
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# ss0...ssN:
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# Shortcuts for the previous targets.
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# clean:
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# Delete all built executables. Generated source files are *not*
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# deleted.
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# dump:
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# Print some Make variables for debugging.
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#
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# TODO:
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# * Compile each .swift file into an intermediate .o file and link the .o
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# files, rather than performing a complete build of all files any time
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# any one of them is out-of-date. Here are the commands generated when
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# using `swiftc -v`:
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#
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# /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift \
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# -frontend \
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# -c \
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# -primary-file stepA_mal.swift \
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# ./core.swift \
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# ./env.swift \
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# ./main.swift \
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# ./printer.swift \
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# ./reader.swift \
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# ./readline.swift \
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# ./types.swift \
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# -target x86_64-apple-darwin14.1.0 \
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# -target-cpu core2 \
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# -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk \
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# -import-objc-header ./bridging-header.h \
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# -color-diagnostics \
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# -Onone \
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# -ledit \
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# -module-name stepA_mal \
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# -o /var/folders/dj/p3tx6v852sl88g79qvhhc2ch0000gp/T/stepA_mal-e0a836.o
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# ... Similar for each source file...
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# /usr/bin/ld \
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# /var/folders/dj/p3tx6v852sl88g79qvhhc2ch0000gp/T/stepA_mal-e0a836.o \
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# /var/folders/dj/p3tx6v852sl88g79qvhhc2ch0000gp/T/core-28b620.o \
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# /var/folders/dj/p3tx6v852sl88g79qvhhc2ch0000gp/T/env-5d8422.o \
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# /var/folders/dj/p3tx6v852sl88g79qvhhc2ch0000gp/T/main-e79633.o \
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# /var/folders/dj/p3tx6v852sl88g79qvhhc2ch0000gp/T/printer-cdd3e5.o \
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# /var/folders/dj/p3tx6v852sl88g79qvhhc2ch0000gp/T/reader-bb188a.o \
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# /var/folders/dj/p3tx6v852sl88g79qvhhc2ch0000gp/T/readline-53df55.o \
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# /var/folders/dj/p3tx6v852sl88g79qvhhc2ch0000gp/T/types-7cb250.o \
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# -L /usr/lib \
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# -ledit \
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# -syslibroot \
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# /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk \
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# -lSystem \
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# -arch x86_64 \
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# -L /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx \
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# -rpath /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/macosx \
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# -macosx_version_min 10.10.0 \
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# -no_objc_category_merging \
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# -o stepA_mal
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#
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# * Consider adding a clean-dist (or similar) that deletes the generated
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# "step" source files.
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#
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################################################################################
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#
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# Discover the set of "step" source files (those having the form
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# "step<#>_foo.swift")
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#
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SRCS := $(wildcard ./step*.swift)
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#
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# From the set of "step" source files, generate the set of executable files
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# (those having the form "step<#>_foo")
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#
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EXES := $(patsubst %.swift,%,$(SRCS))
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#
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# Also generate references to any debug-symbol directories we may make when -g
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# is specified.
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#
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DSYMS := $(patsubst %.swift,%.dSYM,$(SRCS))
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#
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# Given a name like "./step<#>_foo", return <#>.
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#
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# (Is there a better way to do this? $(patsubst) seems to be the most
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# appropriate built-in command, but it doesn't seem powerful enough.)
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#
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# (I've included a `sed` version in case relying on bash is contraindicated.)
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#
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get_step_number = $(shell echo $(1) | sed -e "s/.*step\(.\).*/\1/")
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#get_step_number = $(shell [[ $(1) =~ step(.)_.* ]] ; echo $${BASH_REMATCH[1]})
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#
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# Working from the list of discovered "step<#>_foo.swift" files, generate the
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# list of step numbers.
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#
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get_all_step_numbers = $(foreach SRC,$(SRCS),$(call get_step_number,$(SRC)))
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#
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# Generate the dependencies for the "all" target. This list has the form
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# "s0 s1 ... sN" for all N returned by get_all_step_numbers. That is:
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#
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# all: s0 s1 ... sN
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#
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# Also create an "alls" target that just regenerates all the "step" files from
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# the corresponding template file.
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#
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$(eval all: $(patsubst %,s%,$(call get_all_step_numbers)))
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$(eval alls: $(patsubst %,ss%,$(call get_all_step_numbers)))
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#
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# Generate the dependencies for the ".PHONY" target. That is:
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#
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# .PHONY: all clean dump s0 s1 ... sN
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#
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$(eval .PHONY: all clean dump $(patsubst %,s%,$(call get_all_step_numbers)))
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#
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# Define the "EZ" targets, where "s0" builds "step0_repl", "s1" builds
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# "step1_read_print", etc. That is:
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#
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# s0: step0_repl
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# s1: step1_read_print
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# ...
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# sN: stepN_foo
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#
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# Also create corresponding targets that rebuild the sources files:
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#
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# ss0: step0_repl.swift
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# ss1: step1_read_print.swift
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# ...
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# ssN: stepN_foo.swift
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#
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$(foreach EXE,$(EXES),$(eval s$(call get_step_number,$(EXE)): $(EXE)))
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$(foreach SRC,$(SRCS),$(eval ss$(call get_step_number,$(SRC)): $(SRC)))
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#
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# Various helpful variables.
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#
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DEV_DIR := $(firstword $(wildcard /Applications/Xcode-beta.app /Applications/Xcode.app))
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SWIFT := $(shell DEVELOPER_DIR="$(DEV_DIR)" xcrun --find swiftc 2>/dev/null)
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SDKROOT := $(shell DEVELOPER_DIR="$(DEV_DIR)" xcrun --show-sdk-path 2>/dev/null)
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STEP_TEMPLATE := ./templates/step.swift
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FILTER := ./templates/filter_steps.sh
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UTIL_SRC := $(filter-out $(STEP_TEMPLATE) $(SRCS),$(wildcard ./*.swift))
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ifndef TYPES
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TYPES := CLASS
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endif
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ifeq ($(TYPES), ENUM)
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UTIL_SRC := $(filter-out ./types_class.swift,$(UTIL_SRC))
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else
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UTIL_SRC := $(filter-out ./types_enum.swift,$(UTIL_SRC))
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endif
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OPT := -Ounchecked -whole-module-optimization
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DEBUG := #-g
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EXTRA := #-v
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COMMON := $(UTIL_SRC) $(OPT) $(DEBUG) $(EXTRA) -import-objc-header ./bridging-header.h -L /usr/lib -ledit -sdk $(SDKROOT)
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#
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# Build the executable from the input sources consisting of the appropriate
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# "step" file and the supporting files in $(UTIL_SRC).
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#
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$(EXES) : % : %.swift $(UTIL_SRC) ./Makefile
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@echo "Making : $@"
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@$(SWIFT) $< $(COMMON) -o $@
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#
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# Build the "step" source file ("step<#>_foo.swift") from the step template
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# file that combines all the steps in one file.
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#
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$(SRCS) : % : $(STEP_TEMPLATE) ./Makefile
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@echo "Generating: $@"
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@$(FILTER) $(call get_step_number,$@) $< $@
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#
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# Delete all of the build output (other than generated "step" source files)
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#
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clean:
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@rm -rf $(EXES) $(DSYMS)
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#
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# Display some variables for debugging.
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#
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dump:
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@echo " SRCS = $(SRCS)"
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@echo " EXES = $(EXES)"
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@echo " DSYMS = $(DSYMS)"
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@echo " UTIL = $(UTIL_SRC)"
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@echo " SWIFT = $(SWIFT)"
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@echo "SDKROOT = $(SDKROOT)"
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@echo " STEPS = $(call get_all_step_numbers)"
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#
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# Display source stats
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#
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.PHONY: stats tests $(TESTS)
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stats: bridging-header.h $(UTIL_SRC) ./stepA_mal.swift
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@wc $^
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@printf "%5s %5s %5s %s\n" `grep -E "^[[:space:]]*//|^[[:space:]]*$$" $^ | wc` "[comments/blanks]"
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stats-lisp: ./env.swift ./core.swift ./stepA_mal.swift
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@wc $^
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@printf "%5s %5s %5s %s\n" `grep -E "^[[:space:]]*//|^[[:space:]]*$$" $^ | wc` "[comments/blanks]"
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