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# 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
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