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Diffstat (limited to 'bootstrap.gmake')
| -rw-r--r-- | bootstrap.gmake | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/bootstrap.gmake b/bootstrap.gmake new file mode 100644 index 0000000..e378f4c --- /dev/null +++ b/bootstrap.gmake @@ -0,0 +1,163 @@ +# file : bootstrap.gmake -*- Makefile -*- +# copyright : Copyright (c) 2014-2017 Code Synthesis Ltd +# license : MIT; see accompanying LICENSE file + +# This makefile requires GNU make 3.81 or later and can be used to bootstrap +# the build system similar to the bootstrap.sh script. Its main advantage over +# the script is support for building in parallel. +# +# Similar to the script, the makefile expects to find the libbutl/ or +# libbutl-*/ directory either in the current directory (build2 root) or one +# level up. Both in-tree and out-of-tree builds as well as the 'clean' target +# are supported. The result is saved as build2/b-boot. +# +# Typical in-tree build: +# +# cd build2-X.Y.Z +# make -f bootstrap.gmake -j 8 CXX=g++-7 +# +# Typical out-of-tree build: +# +# mkdir build2-boot +# cd build2-boot +# make -f ../build2-X.Y.Z/bootstrap.gmake -j 8 CXX=g++-7 +# +# The following standard make variables can be used to customize the build: +# +# CXX +# CPPFLAGS +# CXXFLAGS +# LDFLAGS +# LIBS + +# Remove all the built-in rules, enable second expansion, etc. +# +.SUFFIXES: +ifeq ($(filter -r,$(MAKEFLAGS)),) +MAKEFLAGS += -r +endif + +.DELETE_ON_ERROR: +.SECONDEXPANSION: + +# We build in CWD and figure out the source directory based on the makefile +# path. +# +out_root := . +src_root := $(patsubst %/,%,$(dir $(lastword $(MAKEFILE_LIST)))) + +ifeq ($(realpath $(out_root)),$(realpath $(src_root))) + in_tree := true +else + in_tree := false +endif + +# See if there is libbutl or libbutl-* in src_root or one directory up. +# +libbutl := +ifeq ($(libbutl),) + libbutl := $(filter %/,$(wildcard $(src_root)/libbutl/)) + ifeq ($(libbutl),) + libbutl := $(filter %/,$(wildcard $(src_root)/libbutl-*/)) + endif +endif + +ifeq ($(libbutl),) + libbutl := $(filter %/,$(wildcard $(src_root)/../libbutl/)) + ifeq ($(libbutl),) + libbutl := $(filter %/,$(wildcard $(src_root)/../libbutl-*/)) + endif +endif + +ifeq ($(libbutl),) + $(error unable to find libbutl, use libbutl=<dir> to specify its location) +endif + +ifneq ($(words $(libbutl)),1) + $(error found multiple libbutl, use libbutl=<dir> to specify its location) +endif + +libbutl := $(patsubst %/,%,$(libbutl)) + +# Figure out libbutl output directory. If we are building in-tree, then build +# libbutl in-tree as well, whether inside or level up. Otherwise -- in the +# libbutl subdirectory. +# +ifeq ($(in_tree),true) + libbutl_out := $(libbutl)/libbutl +else + libbutl_out := $(out_root)/libbutl +endif + +# Obtain the host triplet. +# +host := +chost := +ifeq ($(host),) + host := $(shell $(src_root)/config.guess) + + ifeq ($(host),) + $(error unable to guess host triplet, use host=<triplet> to specify) + endif + + chost := $(host) +else + ifeq ($(chost),) + chost := $(shell $(src_root)/config.sub $(host)) + + ifeq ($(chost),) + $(error unable to canonicalize host triplet, use chost=<triplet> to specify) + endif + endif +endif + +# Figure out the list of source/object files. +# +# Note: list nested subdirectories first (used in clean). +# +sub_dirs := \ +config \ +dist \ +bin \ +c \ +cc \ +cxx \ +cli \ +test/script \ +test \ +version \ +install \ +pkgconfig + +build2_src := $(wildcard $(src_root)/build2/*.cxx) +build2_src += $(foreach d,$(sub_dirs),$(wildcard $(src_root)/build2/$d/*.cxx)) +libbutl_src := $(wildcard $(libbutl)/libbutl/*.cxx) + +build2_obj := $(patsubst $(src_root)/%.cxx,$(out_root)/%.o,$(build2_src)) +libbutl_obj := $(patsubst $(libbutl)/libbutl/%.cxx,$(libbutl_out)/%.o,$(libbutl_src)) + +# Build. +# +$(out_root)/build2/b-boot: $(build2_obj) $(libbutl_obj) + $(CXX) -std=c++1y $(CXXFLAGS) $(LDFLAGS) -o $@ $^ -lpthread $(LIBS) + +$(out_root)/build2/%.o: $(src_root)/build2/%.cxx | $$(dir $$@). + $(CXX) -I$(libbutl) -I$(src_root) -DBUILD2_HOST_TRIPLET=\"$(chost)\" $(CPPFLAGS) -std=c++1y $(CXXFLAGS) -o $@ -c $< + +$(libbutl_out)/%.o: $(libbutl)/libbutl/%.cxx | $$(dir $$@). + $(CXX) -I$(libbutl) $(CPPFLAGS) -std=c++1y $(CXXFLAGS) -o $@ -c $< + +.PRECIOUS: %/. +%/. : + mkdir -p $* + +# Clean. +# +.PHONY: clean +clean: + rm -f $(out_root)/build2/b-boot + rm -f $(build2_obj) + rm -f $(libbutl_obj) +ifeq ($(in_tree),false) + rm -fd $(foreach d,$(sub_dirs),$(out_root)/build2/$d) $(out_root)/build2 $(libbutl_out) +endif |